/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Enhanced Blue-White Color Palette */
    --primary-blue: #0F4C81;
    --primary-blue-dark: #0A3A63;
    --secondary-blue: #2563EB;
    --light-blue: #60A5FA;
    --dark-blue: #0A2540;
    --accent-blue: #3B82F6;
    --sky-blue: #EFF6FF;
    --ultra-light-blue: #F0F9FF;
    --glass-border: rgba(15, 76, 129, 0.1);
    --focus-ring: rgba(37, 99, 235, 0.4);
    
    /* Refined Neutral Colors */
    --white: #FFFFFF;
    --off-white: #FAFBFC;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    
    /* Dark Mode Colors */
    --dark-bg: #0A1628;
    --dark-surface: #1A2332;
    --dark-surface-2: #2A3441;
    --dark-text: #F8FAFC;
    --dark-text-secondary: #CBD5E1;

    /* Stable defaults before JavaScript applies the saved theme */
    --bg-primary: var(--white);
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --border-color: var(--gray-200);
    
    /* Typography - Enhanced Hierarchy */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
    
    /* Font Sizes - Refined Scale */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* Line Heights */
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;
    
    /* Letter Spacing */
    --tracking-tight: -0.025em;
    --tracking-normal: 0em;
    --tracking-wide: 0.025em;
    
    /* Spacing - Refined Scale */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
    --spacing-3xl: 3rem;
    --spacing-4xl: 4rem;
    --spacing-5xl: 5rem;
    --spacing-6xl: 6rem;
    
    /* Border Radius - More Options */
    --radius-xs: 0.25rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Enhanced Shadows - More Depth */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.03);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.08), 0 1px 2px -1px rgb(0 0 0 / 0.08);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.08);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.08), 0 8px 10px -6px rgb(0 0 0 / 0.08);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.15);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
    
    /* Blue Shadows for Depth */
    --shadow-blue-sm: 0 2px 8px rgba(15, 76, 129, 0.08);
    --shadow-blue-md: 0 4px 16px rgba(15, 76, 129, 0.12);
    --shadow-blue-lg: 0 8px 32px rgba(15, 76, 129, 0.16);
    --shadow-blue-xl: 0 16px 48px rgba(15, 76, 129, 0.2);
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-bg-dark: rgba(10, 22, 40, 0.7);
    --glass-blur: blur(20px);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0F4C81 0%, #2563EB 100%);
    --gradient-secondary: linear-gradient(135deg, #2563EB 0%, #60A5FA 100%);
    --gradient-light: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
    --gradient-blue-glow: radial-gradient(circle at 50% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 50%);
    
    /* Transitions - More Natural */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --bg-primary: var(--dark-bg);
    --bg-secondary: var(--dark-surface);
    --bg-tertiary: var(--dark-surface-2);
    --text-primary: var(--dark-text);
    --text-secondary: var(--dark-text-secondary);
    --border-color: var(--dark-surface-2);
}

[data-theme="dark"] body::before {
    background: radial-gradient(1200px 800px at 10% -10%, rgba(59, 130, 246, 0.25) 0%, rgba(59, 130, 246, 0.0) 60%),
                radial-gradient(900px 600px at 90% 0%, rgba(30, 64, 175, 0.2) 0%, rgba(30, 64, 175, 0.0) 60%),
                radial-gradient(800px 600px at 50% 100%, rgba(96, 165, 250, 0.18) 0%, rgba(96, 165, 250, 0.0) 60%);
}

[data-theme="dark"] body::after {
    background-image: none;
    opacity: 0;
}

/* Light Mode Variables */
[data-theme="light"] {
    --bg-primary: var(--white);
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --border-color: var(--gray-200);
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    position: relative;
    overflow-x: hidden;
}

a {
    color: inherit;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 2px;
}

.skip-link {
    position: fixed;
    top: 1rem;
    left: 50%;
    transform: translate(-50%, -200%);
    background: var(--bg-primary);
    border: 1px solid var(--primary-blue);
    border-radius: var(--radius-md);
    padding: 0.75rem 1.25rem;
    font-weight: 600;
    color: var(--primary-blue);
    z-index: 1100;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
    opacity: 0;
}

.skip-link:focus {
    transform: translate(-50%, 0);
    opacity: 1;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(1200px 800px at 10% -10%, rgba(191, 219, 254, 0.5) 0%, rgba(191, 219, 254, 0.0) 60%),
                radial-gradient(900px 600px at 90% 0%, rgba(147, 197, 253, 0.35) 0%, rgba(147, 197, 253, 0.0) 60%),
                radial-gradient(800px 600px at 50% 100%, rgba(96, 165, 250, 0.25) 0%, rgba(96, 165, 250, 0.0) 60%);
    pointer-events: none;
    z-index: -2;
    animation: float 20s ease-in-out infinite;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: none;
    background-size: initial;
    pointer-events: none;
    z-index: -1;
    opacity: 0;
    animation: none;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    33% {
        transform: translateY(-20px) rotate(1deg);
    }
    66% {
        transform: translateY(10px) rotate(-1deg);
    }
}

@keyframes drift {
    0% {
        transform: translateX(0px) translateY(0px);
    }
    100% {
        transform: translateX(-120px) translateY(-120px);
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* Buttons - Premium Design */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem var(--spacing-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 500;
    font-size: var(--text-sm);
    letter-spacing: var(--tracking-normal);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: translateX(-100%);
    transition: transform var(--transition-slow);
}

.btn:hover::before {
    transform: translateX(100%);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-blue-sm), inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-blue-lg), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-blue-sm);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-blue);
    border: 1.5px solid var(--glass-border);
    box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--primary-blue);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .btn-secondary {
    background: var(--dark-surface);
    color: var(--dark-text);
    border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .btn-secondary:hover {
    background: var(--dark-surface-2);
    border-color: var(--secondary-blue);
}

.btn-outline {
    background: transparent;
    color: var(--primary-blue);
    border: 1.5px solid var(--primary-blue);
    box-shadow: none;
}

.btn-outline:hover {
    background: var(--primary-blue);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-blue-md);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--text-base);
    border-radius: var(--radius-xl);
}

/* Navigation - Enhanced Design */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--shadow-sm), 0 1px 0 0 rgba(255, 255, 255, 0.5) inset;
    z-index: var(--z-sticky);
    transition: all var(--transition-normal);
}

[data-theme="dark"] .navbar {
    background: var(--glass-bg-dark);
    box-shadow: var(--shadow-md), 0 1px 0 0 rgba(255, 255, 255, 0.05) inset;
    border-bottom-color: rgba(255, 255, 255, 0.05);
}

.navbar.navbar-scrolled {
    background: rgba(255, 255, 255, 0.85);
    box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .navbar.navbar-scrolled {
    background: rgba(10, 22, 40, 0.9);
    box-shadow: var(--shadow-xl);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-xl);
    max-width: 1280px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Brand link/logo */
.brand-link {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.brand-link:hover {
    transform: scale(1.05);
}

.brand-logo {
    height: 32px;
    width: auto;
    display: block;
    filter: drop-shadow(0 2px 4px rgba(15, 76, 129, 0.1));
}

.brand-wordmark {
    color: var(--primary-blue);
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: var(--tracking-tight);
    line-height: 1;
}

[data-theme="dark"] .brand-wordmark {
    color: var(--dark-text);
}

@media (min-width: 768px) {
    .brand-logo { 
        height: 36px; 
    }
}

@media (max-width: 480px) {
    .brand-wordmark {
        font-size: 1.15rem;
    }
}

.footer .brand-logo {
    height: 38px;
}

.footer .openenvision-logo {
    height: 48px;
    width: auto;
    object-fit: contain;
    border-radius: 0;
}

@media (min-width: 768px) {
    .footer .brand-logo { 
        height: 44px; 
    }

    .footer .openenvision-logo {
        height: 56px;
    }
}

.nav-search {
    flex: 1;
    max-width: 500px;
    margin: 0 var(--spacing-xl);
}

.search-container {
    position: relative;
}

.search-container::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 1rem;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: 2px solid transparent;
    transform: translateY(-50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.search-container[data-loading="true"]::after {
    border-color: rgba(148, 163, 184, 0.45);
    border-top-color: var(--primary-blue);
    animation: spin 0.75s linear infinite;
    opacity: 1;
}

[data-theme="dark"] .search-container[data-loading="true"]::after {
    border-color: rgba(148, 163, 184, 0.6);
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) calc(var(--spacing-lg) + 0.75rem) var(--spacing-sm) 2.75rem;
    border: 1.5px solid transparent;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-xs), inset 0 1px 2px rgba(15, 76, 129, 0.05);
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-weight: 400;
    letter-spacing: var(--tracking-normal);
    transition: all var(--transition-normal);
    cursor: text;
}

.search-input::placeholder {
    color: var(--gray-400);
    font-weight: 400;
}

.search-input:hover {
    border-color: var(--glass-border);
    box-shadow: var(--shadow-sm), inset 0 1px 2px rgba(15, 76, 129, 0.05);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-blue-md), 0 0 0 4px rgba(15, 76, 129, 0.08);
    background: var(--white);
}

[data-theme="dark"] .search-input {
    background: rgba(26, 35, 50, 0.8);
    color: var(--dark-text);
    box-shadow: var(--shadow-xs), inset 0 1px 2px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .search-input:focus {
    background: var(--dark-surface);
    border-color: var(--secondary-blue);
    box-shadow: var(--shadow-blue-md), 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.search-icon {
    position: absolute;
    left: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
    transition: all var(--transition-normal);
}

.search-suggestions {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.12);
    max-height: 320px;
    overflow-y: auto;
    z-index: 100;
    display: none;
    padding-block: 0.25rem;
}

.search-suggestions::-webkit-scrollbar {
    width: 6px;
}

.search-suggestions::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.35);
    border-radius: 999px;
}

/* ========================================
   SEARCH OVERLAY (Full Screen Experience)
   ======================================== */

.search-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
    z-index: 1050;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
}

[data-theme="dark"] .search-overlay {
    background: rgba(15, 23, 42, 0.65);
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-overlay-content {
    width: 90%;
    max-width: 700px;
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: 0 25px 50px rgba(15, 23, 42, 0.25);
    border: 1px solid var(--glass-border);
    overflow: hidden;
    transform: translateY(-30px) scale(0.95);
    opacity: 0;
    transition: all var(--transition-normal);
}

[data-theme="dark"] .search-overlay-content {
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    border-color: rgba(148, 163, 184, 0.15);
}

.search-overlay.active .search-overlay-content {
    transform: translateY(0) scale(1);
    opacity: 1;
}

.search-overlay-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    gap: var(--spacing-md);
}

.search-overlay-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: var(--primary-blue);
}

.search-overlay-input-wrapper {
    flex: 1;
    position: relative;
}

.search-overlay-input {
    width: 100%;
    padding: var(--spacing-sm) 0;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 400;
    outline: none;
}

.search-overlay-input::placeholder {
    color: var(--text-secondary);
}

.search-overlay-close {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-overlay-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.search-overlay-filters {
    padding: 0 var(--spacing-lg) var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.search-overlay-filter-toggle {
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.8rem;
    border-radius: var(--radius-full);
    border: 1px solid transparent;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-overlay-filter-toggle:hover {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary-blue);
}

.search-overlay-filter-toggle.has-active-filters {
    background: rgba(37, 99, 235, 0.12);
    color: var(--primary-blue);
    border-color: rgba(37, 99, 235, 0.25);
}

[data-theme="dark"] .search-overlay-filter-toggle {
    background: rgba(96, 165, 250, 0.12);
    color: var(--dark-text-secondary);
}

[data-theme="dark"] .search-overlay-filter-toggle:hover {
    background: rgba(96, 165, 250, 0.2);
    color: var(--dark-text);
}

[data-theme="dark"] .search-overlay-filter-toggle.has-active-filters {
    border-color: rgba(147, 197, 253, 0.4);
    color: var(--dark-text);
}

.search-overlay-filter-panel {
    display: none;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.search-overlay-filter-panel.active {
    display: flex;
}

.search-overlay-filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    min-width: 180px;
}

.search-overlay-filter-group label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.search-overlay-filter-select {
    padding: 0.45rem 0.6rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-overlay-filter-select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

[data-theme="dark"] .search-overlay-filter-select {
    background: var(--dark-surface);
    border-color: rgba(148, 163, 184, 0.3);
    color: var(--dark-text);
}

[data-theme="dark"] .search-overlay-filter-select:focus {
    border-color: rgba(147, 197, 253, 0.6);
    box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.2);
}

.search-overlay-results {
    max-height: 50vh;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.search-overlay-results::-webkit-scrollbar {
    width: 6px;
}

.search-overlay-results::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.35);
    border-radius: 999px;
}

.search-overlay-item {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.search-overlay-item:hover {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

.search-overlay-item.active {
    background: rgba(37, 99, 235, 0.08);
    border-color: rgba(37, 99, 235, 0.2);
}

.search-overlay-item-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.search-overlay-item-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.search-overlay-item-category {
    display: inline-flex;
    padding: 0.125rem 0.5rem;
    background: var(--bg-tertiary);
    color: var(--primary-blue);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.search-overlay-empty {
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
}

.search-overlay-empty-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-lg);
    color: var(--text-secondary);
    opacity: 0.5;
}

.search-overlay-empty h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.search-overlay-empty p {
    color: var(--text-secondary);
    margin: 0;
}

.search-overlay-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.search-overlay-shortcuts {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.search-overlay-shortcut {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.search-overlay-key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    padding: 0.125rem 0.375rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: var(--font-mono);
    font-weight: 500;
}

.search-overlay-item mark {
    background: rgba(59, 130, 246, 0.15);
    color: var(--primary-blue);
    padding: 0.125rem 0.25rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

/* Animation for search overlay */
@keyframes searchOverlayFadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.search-overlay-item {
    animation: searchOverlayFadeIn 0.3s ease-out;
}

.search-overlay-item:nth-child(1) { animation-delay: 0.05s; }
.search-overlay-item:nth-child(2) { animation-delay: 0.1s; }
.search-overlay-item:nth-child(3) { animation-delay: 0.15s; }
.search-overlay-item:nth-child(4) { animation-delay: 0.2s; }
.search-overlay-item:nth-child(5) { animation-delay: 0.25s; }

/* Prevent body scroll when search overlay is active */
body.search-overlay-open {
    overflow: hidden;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .search-overlay {
        padding-top: 10vh;
    }
    
    .search-overlay-content {
        width: 95%;
        max-width: none;
        border-radius: var(--radius-xl);
    }

    .search-overlay-filters {
        padding: 0 var(--spacing-md) var(--spacing-md);
    }

    .search-overlay-filter-panel {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .search-overlay-filter-group {
        width: 100%;
    }
    
    .search-overlay-input {
        font-size: 1rem;
    }
    
    .search-overlay-footer {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }
    
    .search-overlay-shortcuts {
        flex-wrap: wrap;
    }
    
    /* Hide "Open" shortcut on mobile since search is already open */
    .search-overlay-shortcuts .search-overlay-shortcut:first-child {
        display: none;
    }
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--bg-tertiary);
    transform: scale(1.05);
}

.moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

/* Hero Section */
.hero {
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, #f8fafc 0%, #e0f2fe 30%, #dbeafe 60%, #f0f9ff 100%);
    overflow: hidden;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 15% 85%, rgba(30, 64, 175, 0.15) 0%, transparent 60%),
        radial-gradient(circle at 85% 15%, rgba(59, 130, 246, 0.15) 0%, transparent 60%),
        radial-gradient(circle at 50% 50%, rgba(96, 165, 250, 0.08) 0%, transparent 70%),
        radial-gradient(circle at 25% 25%, rgba(147, 197, 253, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(191, 219, 254, 0.04) 0%, transparent 50%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(45deg, transparent 48%, rgba(30, 64, 175, 0.03) 49%, rgba(30, 64, 175, 0.03) 51%, transparent 52%),
        linear-gradient(-45deg, transparent 48%, rgba(59, 130, 246, 0.03) 49%, rgba(59, 130, 246, 0.03) 51%, transparent 52%);
    background-size: 60px 60px;
    pointer-events: none;
    opacity: 0.6;
}

[data-theme="dark"] .hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 30%, #334155 60%, #475569 100%);
}

[data-theme="dark"] .hero::before {
    background-image: 
        radial-gradient(circle at 15% 85%, rgba(30, 64, 175, 0.25) 0%, transparent 60%),
        radial-gradient(circle at 85% 15%, rgba(59, 130, 246, 0.25) 0%, transparent 60%),
        radial-gradient(circle at 50% 50%, rgba(96, 165, 250, 0.12) 0%, transparent 70%),
        radial-gradient(circle at 25% 25%, rgba(147, 197, 253, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(191, 219, 254, 0.06) 0%, transparent 50%);
}

[data-theme="dark"] .hero::after {
    background-image: 
        linear-gradient(45deg, transparent 48%, rgba(30, 64, 175, 0.05) 49%, rgba(30, 64, 175, 0.05) 51%, transparent 52%),
        linear-gradient(-45deg, transparent 48%, rgba(59, 130, 246, 0.05) 49%, rgba(59, 130, 246, 0.05) 51%, transparent 52%);
    opacity: 0.8;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

/* Make hero buttons equal-width and centered on desktop for better aesthetics */
.hero-actions .btn {
    justify-content: center;
}

@media (min-width: 769px) {
    .hero-actions .btn {
        flex: 1;
        white-space: nowrap;
        min-width: 220px;
    }
}

/* Slightly smaller hero CTA buttons while keeping equal sizing */
.hero .btn-cta.btn-large {
    padding: calc(var(--spacing-md) - 2px) var(--spacing-lg);
    font-size: 0.95rem;
}

.hero-visual {
    position: relative;
    height: auto;
    min-height: 400px;
}

.research-cards {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    max-width: 500px;
    margin: 0 auto;
}

.research-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(248, 250, 252, 0.9) 100%);
    border: 1px solid rgba(30, 64, 175, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: 0 8px 32px rgba(30, 64, 175, 0.1);
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.research-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-blue), var(--light-blue));
}

.research-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(30, 64, 175, 0.15);
    border-color: rgba(30, 64, 175, 0.2);
}

[data-theme="dark"] .research-card {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.9) 0%, rgba(51, 65, 85, 0.9) 100%);
    border-color: rgba(59, 130, 246, 0.2);
    box-shadow: 0 8px 32px rgba(59, 130, 246, 0.1);
}

[data-theme="dark"] .research-card:hover {
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.2);
    border-color: rgba(59, 130, 246, 0.3);
}

.research-card-1 {
    animation: slideInLeft 0.8s ease-out;
}

.research-card-2 {
    animation: slideInLeft 0.8s ease-out 0.2s both;
}

.research-card-3 {
    animation: slideInLeft 0.8s ease-out 0.4s both;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.research-card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
}

.research-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    border-radius: var(--radius-lg);
    color: var(--white);
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.3);
}

.research-content {
    flex: 1;
}

.research-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.research-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

[data-theme="dark"] .research-title {
    background: linear-gradient(135deg, var(--light-blue), var(--secondary-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Sections */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Categories Section */
.categories {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 50%, #f1f5f9 100%);
    position: relative;
    overflow: hidden;
}

.categories::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(30, 64, 175, 0.08) 0%, transparent 60%),
        radial-gradient(circle at 90% 80%, rgba(59, 130, 246, 0.08) 0%, transparent 60%),
        radial-gradient(circle at 50% 10%, rgba(96, 165, 250, 0.04) 0%, transparent 50%),
        radial-gradient(circle at 20% 70%, rgba(147, 197, 253, 0.03) 0%, transparent 40%);
    pointer-events: none;
}

.categories::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(90deg, transparent 0%, rgba(30, 64, 175, 0.02) 50%, transparent 100%),
        linear-gradient(0deg, transparent 0%, rgba(59, 130, 246, 0.02) 50%, transparent 100%);
    background-size: 100px 100px, 80px 80px;
    pointer-events: none;
    opacity: 0.5;
}

[data-theme="dark"] .categories {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
}

[data-theme="dark"] .categories::before {
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(30, 64, 175, 0.15) 0%, transparent 60%),
        radial-gradient(circle at 90% 80%, rgba(59, 130, 246, 0.15) 0%, transparent 60%),
        radial-gradient(circle at 50% 10%, rgba(96, 165, 250, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 20% 70%, rgba(147, 197, 253, 0.06) 0%, transparent 40%);
}

[data-theme="dark"] .categories::after {
    background-image: 
        linear-gradient(90deg, transparent 0%, rgba(30, 64, 175, 0.04) 50%, transparent 100%),
        linear-gradient(0deg, transparent 0%, rgba(59, 130, 246, 0.04) 50%, transparent 100%);
    opacity: 0.7;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.category-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue);
}

.category-card:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 4px;
    box-shadow: 0 0 0 6px rgba(59, 130, 246, 0.12);
}

.category-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-lg);
    color: var(--white);
}

.category-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.category-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: 0.875rem;
}

.category-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.empty-state-card {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-3xl);
    margin-top: var(--spacing-xl);
    border-radius: var(--radius-2xl);
    border: 1px dashed var(--glass-border);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    text-align: center;
    min-height: 240px;
}

[data-theme="dark"] .empty-state-card {
    background: var(--bg-tertiary);
    border-color: rgba(148, 163, 184, 0.35);
}

.empty-state-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.empty-state-card p {
    max-width: 420px;
}

.empty-state-icon {
    font-size: 2.5rem;
    line-height: 1;
}

.stat {
    font-weight: 500;
}

/* Popular Blogs Section */
.popular-blogs {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e0f2fe 40%, #dbeafe 80%, #f0f9ff 100%);
    position: relative;
    overflow: hidden;
}

.popular-blogs::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 30% 10%, rgba(30, 64, 175, 0.12) 0%, transparent 60%),
        radial-gradient(circle at 70% 90%, rgba(59, 130, 246, 0.12) 0%, transparent 60%),
        radial-gradient(circle at 50% 50%, rgba(96, 165, 250, 0.06) 0%, transparent 60%),
        radial-gradient(circle at 15% 60%, rgba(147, 197, 253, 0.04) 0%, transparent 50%),
        radial-gradient(circle at 85% 40%, rgba(191, 219, 254, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.popular-blogs::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        conic-gradient(from 0deg at 20% 20%, transparent 0deg, rgba(30, 64, 175, 0.02) 60deg, transparent 120deg),
        conic-gradient(from 180deg at 80% 80%, transparent 0deg, rgba(59, 130, 246, 0.02) 60deg, transparent 120deg),
        conic-gradient(from 90deg at 50% 30%, transparent 0deg, rgba(96, 165, 250, 0.015) 45deg, transparent 90deg);
    pointer-events: none;
    opacity: 0.6;
}

[data-theme="dark"] .popular-blogs {
    background: linear-gradient(135deg, #1e293b 0%, #334155 40%, #475569 80%, #64748b 100%);
}

[data-theme="dark"] .popular-blogs::before {
    background-image: 
        radial-gradient(circle at 30% 10%, rgba(30, 64, 175, 0.2) 0%, transparent 60%),
        radial-gradient(circle at 70% 90%, rgba(59, 130, 246, 0.2) 0%, transparent 60%),
        radial-gradient(circle at 50% 50%, rgba(96, 165, 250, 0.1) 0%, transparent 60%),
        radial-gradient(circle at 15% 60%, rgba(147, 197, 253, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 85% 40%, rgba(191, 219, 254, 0.05) 0%, transparent 50%);
}

[data-theme="dark"] .popular-blogs::after {
    background-image: 
        conic-gradient(from 0deg at 20% 20%, transparent 0deg, rgba(30, 64, 175, 0.04) 60deg, transparent 120deg),
        conic-gradient(from 180deg at 80% 80%, transparent 0deg, rgba(59, 130, 246, 0.04) 60deg, transparent 120deg),
        conic-gradient(from 90deg at 50% 30%, transparent 0deg, rgba(96, 165, 250, 0.03) 45deg, transparent 90deg);
    opacity: 0.8;
}

.blogs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.blog-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    min-height: 100%;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.blog-card:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 4px;
    box-shadow: 0 0 0 6px rgba(59, 130, 246, 0.15);
}

.blog-image {
    width: 100%;
    height: 220px;
    background: linear-gradient(135deg, rgba(15, 76, 129, 0.08), rgba(37, 99, 235, 0.12));
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.blog-cover-image {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.blog-cover-image.is-contain {
    object-fit: contain;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(248, 250, 252, 0.96), rgba(224, 242, 254, 0.82));
}

.blog-card:hover .blog-cover-image {
    transform: scale(1.035);
}

.blog-source-pill {
    position: absolute;
    left: var(--spacing-md);
    bottom: var(--spacing-md);
    max-width: calc(100% - var(--spacing-xl));
    padding: 0.35rem 0.65rem;
    border-radius: var(--radius-md);
    background: rgba(15, 23, 42, 0.74);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1.2;
    backdrop-filter: blur(10px);
}

.blog-content {
    padding: var(--spacing-lg);
    display: flex;
    flex: 1;
    flex-direction: column;
}

.blog-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.blog-category {
    background-color: var(--bg-secondary);
    color: var(--primary-blue);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.blog-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    line-height: 1.4;
}

.blog-excerpt {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    flex: 1;
}

.blog-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.blog-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1 1 180px;
    min-width: 0;
}

.author-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    border: 2px solid rgba(255, 255, 255, 0.86);
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.12);
    flex: 0 0 auto;
    object-fit: cover;
}

.author-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.blog-source-link {
    color: var(--primary-blue);
    flex: 0 0 auto;
    font-size: 0.8125rem;
    font-weight: 600;
    text-decoration: none;
}

.blog-source-link:hover {
    color: var(--primary-blue-dark);
    text-decoration: underline;
}

.blog-stats {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.blog-stats .stat {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* 通用图标样式，适配站点色系 */
.icon {
    width: 18px;
    height: 18px;
    stroke: var(--primary-blue);
}

.btn .icon {
    width: 18px;
    height: 18px;
    margin-right: 4px;
}

.btn.btn-outline .icon {
    stroke: currentColor;
}

.is-hidden {
    display: none !important;
}

.load-more {
    text-align: center;
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.categories-load-more {
    margin-top: var(--spacing-2xl);
}

/* Small helper text under hero actions */
.hero-subnote {
    margin-top: var(--spacing-md);
    font-size: 0.95rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Center single CTA on desktop */
.hero-actions-single {
    justify-content: center;
}

/* Align helper text with paragraph start on desktop */
.align-left {
    text-align: left;
}

/* Enhanced CTA button for hero */
.btn-cta {
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 20px rgba(30, 64, 175, 0.15);
    background-image: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(30, 64, 175, 0.25);
}

[data-theme="dark"] .hero-subnote {
    color: var(--text-secondary);
}

/* Newsletter */
.newsletter {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(180deg, var(--gray-50) 0%, var(--ultra-light-blue) 100%);
}

.newsletter-content {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
    gap: var(--spacing-2xl);
    align-items: center;
    padding: clamp(2rem, 4vw, 3rem);
    color: var(--white);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-2xl);
}

.newsletter-text {
    min-width: 0;
}

.newsletter-title {
    color: var(--white);
    font-size: clamp(2rem, 4vw, 2.75rem);
    line-height: var(--leading-tight);
    font-weight: 800;
    letter-spacing: 0;
    margin-bottom: var(--spacing-md);
}

.newsletter-description {
    max-width: 42rem;
    color: rgba(255, 255, 255, 0.86);
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    margin-bottom: 0;
}

.newsletter-form {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.newsletter-action {
    min-height: 5.75rem;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    color: var(--gray-900);
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: var(--radius-md);
    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.18);
    text-decoration: none;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.newsletter-action:hover {
    transform: translateY(-3px);
    border-color: rgba(255, 255, 255, 0.96);
    box-shadow: 0 18px 42px rgba(15, 23, 42, 0.24);
}

.newsletter-action:focus-visible {
    outline: 3px solid rgba(186, 230, 253, 0.85);
    outline-offset: 3px;
}

.newsletter-action-icon {
    width: 3rem;
    height: 3rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    border-radius: var(--radius-md);
    flex: 0 0 auto;
}

.newsletter-action-icon svg {
    width: 1.6rem;
    height: 1.6rem;
}

.newsletter .github-action .newsletter-action-icon {
    background: var(--gray-900);
}

.newsletter .github-action .newsletter-action-icon svg {
    fill: currentColor;
}

.newsletter .mail-action .newsletter-action-icon {
    background: var(--secondary-blue);
}

.newsletter .mail-action .newsletter-action-icon svg {
    fill: none;
}

.newsletter-action-copy {
    min-width: 0;
    display: grid;
    gap: 0.2rem;
}

.newsletter-action-label {
    color: var(--gray-900);
    font-size: var(--text-base);
    font-weight: 700;
    line-height: var(--leading-snug);
}

.newsletter-action-meta {
    color: var(--gray-600);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    line-height: var(--leading-normal);
    overflow-wrap: anywhere;
}

.newsletter-action-arrow {
    width: 2rem;
    height: 2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    background: var(--sky-blue);
    border-radius: var(--radius-md);
}

.newsletter-action-arrow svg {
    width: 1.1rem;
    height: 1.1rem;
}

[data-theme="dark"] .newsletter {
    background: linear-gradient(180deg, var(--dark-bg) 0%, #101C2F 100%);
}

[data-theme="dark"] .newsletter-content {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
}

[data-theme="dark"] .newsletter-action {
    background: rgba(15, 23, 42, 0.9);
    border-color: rgba(226, 232, 240, 0.16);
}

[data-theme="dark"] .newsletter-action-label {
    color: var(--white);
}

[data-theme="dark"] .newsletter-action-meta {
    color: var(--dark-text-secondary);
}

[data-theme="dark"] .newsletter-action-arrow {
    color: #BAE6FD;
    background: rgba(96, 165, 250, 0.16);
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: minmax(220px, 2fr) minmax(110px, 0.85fr) minmax(110px, 0.85fr) minmax(220px, 1.45fr);
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
}

.footer-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-blue);
}

.footer-contribute-section {
    min-width: 0;
}

.footer-actions {
    display: grid;
    gap: var(--spacing-sm);
}

.footer-action-link {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: var(--spacing-sm);
    min-height: 4.25rem;
    padding: 0.8rem 0.85rem;
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    text-decoration: none;
    box-shadow: var(--shadow-xs);
    transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal);
}

.footer-action-link:hover {
    transform: translateY(-2px);
    border-color: rgba(37, 99, 235, 0.28);
    box-shadow: var(--shadow-blue-sm);
}

.footer-action-link:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 3px;
}

.footer-action-icon {
    width: 2.25rem;
    height: 2.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--white);
    flex: 0 0 auto;
}

.footer-action-icon svg {
    width: 1.25rem;
    height: 1.25rem;
    fill: currentColor;
}

.footer-github-action .footer-action-icon {
    background: var(--gray-900);
}

.footer-mail-action .footer-action-icon {
    background: #0F766E;
}

.footer-action-copy {
    min-width: 0;
    display: grid;
    gap: 0.15rem;
}

.footer-action-label {
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-weight: 700;
    line-height: var(--leading-snug);
}

.footer-action-meta {
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    line-height: var(--leading-normal);
    overflow-wrap: anywhere;
}

.footer-contribute-note {
    margin-top: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: var(--text-xs);
    line-height: var(--leading-relaxed);
}

[data-theme="dark"] .footer-action-link {
    background: rgba(15, 23, 42, 0.42);
    border-color: rgba(226, 232, 240, 0.13);
}

[data-theme="dark"] .footer-action-link:hover {
    border-color: rgba(96, 165, 250, 0.35);
    box-shadow: 0 10px 24px rgba(2, 6, 23, 0.28);
}

[data-theme="dark"] .footer-github-action .footer-action-icon {
    background: var(--gray-800);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

.footer-copyright {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-legal {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-legal a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-legal a:hover {
    color: var(--primary-blue);
}

.visitor-map {
    width: min(100%, 960px);
    margin: var(--spacing-xl) auto;
    padding: 0 var(--spacing-md);
    text-align: center;
}

.visitor-map img,
.visitor-map iframe,
.visitor-map object,
.visitor-map embed {
    max-width: 100%;
}

/* Theme contrast hardening */
[data-theme="dark"] .nav-brand .brand-link,
[data-theme="dark"] .sidebar-brand .brand-link,
[data-theme="dark"] .footer-brand .brand-link {
    padding: 0.22rem 0.45rem;
    background: rgba(248, 250, 252, 0.9);
    border: 1px solid rgba(226, 232, 240, 0.74);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 22px rgba(2, 6, 23, 0.22);
}

[data-theme="dark"] .brand-logo {
    filter: drop-shadow(0 4px 10px rgba(2, 6, 23, 0.28));
}

[data-theme="dark"] .stat-number,
[data-theme="dark"] .author-stats .stat-number {
    color: #93C5FD;
    text-shadow: 0 0 16px rgba(96, 165, 250, 0.2);
}

[data-theme="dark"] .blog-category,
[data-theme="dark"] .search-overlay-item-category {
    background: rgba(96, 165, 250, 0.14);
    color: #BFDBFE;
    border: 1px solid rgba(147, 197, 253, 0.18);
}

[data-theme="dark"] .blog-source-link,
[data-theme="dark"] .author-institution,
[data-theme="dark"] .footer-links a:hover,
[data-theme="dark"] .footer-legal a:hover {
    color: #93C5FD;
}

[data-theme="dark"] .sidebar-icon,
[data-theme="dark"] .icon {
    stroke: #93C5FD;
}

[data-theme="dark"] .filters-section,
[data-theme="dark"] .stat-card,
[data-theme="dark"] .blog-list-item {
    background-color: rgba(15, 23, 42, 0.62);
    border-color: rgba(148, 163, 184, 0.18);
}

[data-theme="dark"] .filter-select,
[data-theme="dark"] .view-btn {
    background-color: rgba(15, 23, 42, 0.72);
    border-color: rgba(148, 163, 184, 0.22);
    color: var(--dark-text);
}

[data-theme="dark"] .filter-select:focus,
[data-theme="dark"] .view-btn:focus-visible {
    border-color: rgba(147, 197, 253, 0.6);
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.18);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .newsletter-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .newsletter-text {
        text-align: center;
    }

    .newsletter-form {
        max-width: 36rem;
        margin: 0 auto;
        width: 100%;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-xl);
    }
    
    .categories-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }
    
    .nav-search {
        order: 3;
        width: 100%;
        max-width: none;
        margin: 0;
    }
    
    .nav-actions {
        order: 2;
        justify-content: center;
        width: 100%;
    }
    
    .hero {
        padding: 6rem 0 3rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
        line-height: 1.2;
    }
    
    .hero-actions {
        justify-content: center;
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .hero-actions .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .category-card {
        padding: var(--spacing-lg);
    }
    
    .blogs-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .blog-card {
        margin-bottom: var(--spacing-md);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-xl);
    }

    .footer-actions {
        max-width: 24rem;
        margin: 0 auto;
        text-align: left;
    }

    .footer-contribute-note {
        max-width: 24rem;
        margin-right: auto;
        margin-left: auto;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-container {
        padding: var(--spacing-sm);
    }
    
    .hero {
        padding: 5rem 0 2rem;
    }
    
    .hero-title {
        font-size: 2rem;
        line-height: 1.3;
    }
    
    .hero-description {
        font-size: 1rem;
        margin-bottom: var(--spacing-lg);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .hero-actions .btn {
        width: 100%;
        max-width: 280px;
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .section-description {
        font-size: 1rem;
    }
    
    .category-card {
        padding: var(--spacing-md);
    }
    
    .category-title {
        font-size: 1.125rem;
    }
    
    .blog-card {
        margin-bottom: var(--spacing-sm);
    }
    
    .blog-title {
        font-size: 1rem;
    }
    
    .research-cards {
        max-width: 100%;
        gap: var(--spacing-md);
    }
    
    .research-card {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-lg);
    }
    
    .research-icon {
        align-self: center;
        margin-bottom: var(--spacing-sm);
    }
    
    .research-title {
        font-size: 1.125rem;
    }
    
    .research-description {
        font-size: 0.875rem;
    }
    
    .newsletter-title {
        font-size: 1.75rem;
    }
    
    .newsletter-description {
        font-size: 1rem;
    }

    .newsletter-content {
        padding: var(--spacing-lg);
    }

    .newsletter-action {
        grid-template-columns: auto minmax(0, 1fr);
        min-height: 5rem;
        padding: var(--spacing-md);
    }

    .newsletter-action-icon {
        width: 2.5rem;
        height: 2.5rem;
    }

    .newsletter-action-arrow {
        display: none;
    }
    
    .footer-content {
        gap: var(--spacing-lg);
    }
    
    .footer-title {
        font-size: 0.875rem;
    }
    
    .footer-links {
        font-size: 0.875rem;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-tertiary) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* Mobile-specific optimizations */
@media (max-width: 768px) {
    /* Improve touch targets */
    .btn {
        min-height: 44px;
        min-width: 44px;
    }
    
    .category-card {
        min-height: 44px;
    }
    
    .blog-card {
        min-height: 44px;
    }
    
    /* Better spacing for mobile */
    .section-header {
        margin-bottom: var(--spacing-2xl);
    }
    
    .categories {
        padding: var(--spacing-2xl) 0;
    }
    
    .featured-blogs {
        padding: var(--spacing-2xl) 0;
    }
    
    .newsletter {
        padding: var(--spacing-2xl) 0;
    }
    
    /* Improve text readability */
    .hero-description {
        line-height: 1.6;
    }
    
    .blog-excerpt {
        line-height: 1.6;
    }
    
    .search-input {
        min-height: 44px;
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ========================================
   GLOBAL LEFT SIDEBAR
   ======================================== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 280px;
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    z-index: 1100;
    display: flex;
    flex-direction: column;
}

.sidebar.open {
    transform: translateX(0);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    color: var(--primary-blue);
}

/* Sidebar brand logo size */
.sidebar-brand-logo {
    height: 26px;
}

.sidebar-brand-wordmark {
    font-size: 1.1rem;
}

@media (min-width: 768px) {
    .sidebar-brand-logo { height: 28px; }
}

.sidebar-nav .sidebar-link span {
    font-weight: 500;
}

.sidebar-link {
    font-size: 0.95rem;
}

.sidebar-close {
    background: transparent;
    border: none;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
}

.sidebar-close:hover {
    background-color: var(--bg-secondary);
}

.sidebar-nav {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 0.75rem 0.875rem;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: background-color var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
}

.sidebar-link:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
    transform: translateX(2px);
}

.sidebar-icon {
    width: 20px;
    height: 20px;
    color: var(--primary-blue);
}

.sidebar-footer {
    margin-top: auto;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.35);
    backdrop-filter: blur(2px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
    z-index: 1090;
}

.sidebar-backdrop.active {
    opacity: 1;
    visibility: visible;
}

.sidebar-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-right: var(--spacing-sm);
}

.sidebar-toggle:hover {
    background-color: var(--bg-tertiary);
    transform: scale(1.05);
}

/* Ensure nav-brand aligns items when toggle is inserted */
.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Aesthetic improvement for sidebar icons */
.sidebar-icon {
    width: 20px;
    height: 20px;
    stroke: var(--primary-blue);
}

body.sidebar-open {
    overflow: hidden;
}

/* Focus Styles */
button:focus-visible,
input:focus-visible,
a:focus-visible {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Page-specific styles */
.page-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    padding: var(--spacing-2xl) 0;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.page-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Filters Section */
.filters-section {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    flex-wrap: wrap;
    align-items: center;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-group label {
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
}

.filter-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    min-width: 150px;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

/* Stats Section */
.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

.stat-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Blogs Section */
.blogs-section {
    margin-bottom: var(--spacing-3xl);
}

.blogs-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
}

.blogs-header h2 {
    color: var(--text-primary);
    font-size: 1.875rem;
    font-weight: 600;
}

.view-toggle {
    display: flex;
    gap: var(--spacing-sm);
}

.view-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.view-btn:hover,
.view-btn.active {
    background-color: var(--primary-blue);
    color: var(--white);
    border-color: var(--primary-blue);
}

/* List View Styles */
.blogs-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.blog-list-item {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.blog-list-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-blue);
}

.blog-list-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-lg);
    align-items: start;
}

.blog-list-content .blog-meta {
    margin-bottom: var(--spacing-sm);
}

.blog-list-content .blog-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.blog-list-content .blog-excerpt {
    margin-bottom: var(--spacing-md);
}

.blog-list-content .blog-footer {
    margin-top: var(--spacing-md);
}

/* Categories Page Styles */
.categories-page {
    padding: 2rem 0 4rem;
    margin-top: 80px;
}

.categories-section {
    margin-bottom: var(--spacing-3xl);
}

.category-card {
    position: relative;
    overflow: hidden;
}

.category-link {
    display: inline-block;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--primary-blue);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.category-link:hover {
    background-color: var(--dark-blue);
    transform: translateY(-1px);
}

.category-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

/* Authors Page Styles */
.authors-page {
    padding: 2rem 0 4rem;
    margin-top: 80px;
}

.authors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.author-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.author-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue);
}

.author-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.author-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    display: block;
    flex-shrink: 0;
    object-fit: cover;
}

.author-info {
    flex: 1;
    min-width: 0;
}

.author-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    white-space: normal;
    overflow-wrap: anywhere;
}

.author-title {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
    overflow-wrap: anywhere;
}

.author-institution {
    color: var(--primary-blue);
    font-size: 0.875rem;
    font-weight: 500;
    overflow-wrap: anywhere;
}

.author-bio {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.6;
}

.author-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.author-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.author-stats .stat {
    text-align: center;
}

.author-stats .stat-number {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

.author-stats .stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.author-recent {
    margin-bottom: var(--spacing-lg);
}

.author-recent h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.author-recent ul {
    list-style: none;
    padding: 0;
}

.author-recent li {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-sm);
    position: relative;
    overflow-wrap: anywhere;
}

.author-recent li::before {
    content: '•';
    color: var(--primary-blue);
    position: absolute;
    left: 0;
}

.author-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.author-actions .btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    text-decoration: none;
}

.author-card:focus-visible {
    outline: 2px solid var(--primary-blue);
    outline-offset: 4px;
}

/* Featured Authors Section */
.featured-authors {
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-3xl);
    border-top: 1px solid var(--border-color);
}

.featured-authors h2 {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
}

.authors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

/* Responsive Design for New Pages */
@media (max-width: 768px) {
    .filters-section {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-select {
        min-width: auto;
    }
    
    .blogs-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }
    
    .view-toggle {
        justify-content: center;
    }
    
    .blog-list-content {
        grid-template-columns: 1fr;
    }
    
    .authors-grid {
        grid-template-columns: 1fr;
    }
    
    .author-header {
        flex-direction: column;
        text-align: center;
    }
    
    .author-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .author-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .page-title {
        font-size: 2rem;
    }
    
    .stats-section {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .author-card {
        padding: var(--spacing-lg);
    }
}

/* Print Styles */
@media print {
    .navbar,
    .hero-actions,
    .newsletter,
    .footer,
    .filters-section,
    .view-toggle,
    .author-actions {
        display: none;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .page-header {
        padding: 1rem 0;
    }
}

/* ========================================
   LOADING ANIMATION STYLES (DISABLED)
   ======================================== */

/* Loading animation container */
.loading-overlay {
    position: fixed;
    inset: 0;
    display: none !important; /* Disabled */
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    opacity: 0;
    pointer-events: none;
    transition: none;
    z-index: 2000;
}

.loading-overlay.active {
    display: none !important; /* Force disabled */
    opacity: 0;
    pointer-events: none;
}

/* Loading background in dark mode */
[data-theme="dark"] .loading-overlay {
    background: rgba(15, 23, 42, 0.88);
}

/* Main loading animation container */
.loading-container {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.75rem;
    padding: 3rem 3.5rem;
    background: rgba(255, 255, 255, 0.92);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--glass-border);
    box-shadow: 0 28px 55px rgba(15, 23, 42, 0.16);
    overflow: hidden;
    z-index: 1;
}

[data-theme="dark"] .loading-container {
    background: rgba(15, 23, 42, 0.85);
    border-color: rgba(148, 163, 184, 0.25);
    box-shadow: 0 28px 55px rgba(15, 23, 42, 0.5);
}

.loading-container::before {
    content: '';
    position: absolute;
    inset: -40% 10% auto 10%;
    height: 220px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(59, 130, 246, 0));
    filter: blur(30px);
    z-index: -1;
}

.loading-container::after {
    content: '';
    position: absolute;
    inset: auto 15% -45% 15%;
    height: 180px;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.14), rgba(59, 130, 246, 0));
    filter: blur(38px);
    z-index: -1;
}

@keyframes haloPulse {
    0%, 100% { transform: translate(-50%, -50%) scale(0.9); opacity: 0.75; }
    50% { transform: translate(-50%, -50%) scale(1.06); opacity: 1; }
}

/* BlogXiv Logo 加载动画 */
.loading-logo {
    position: relative;
    width: 96px;
    height: 96px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(59, 130, 246, 0.18), rgba(59, 130, 246, 0));
    box-shadow: inset 0 0 0 1px rgba(37, 99, 235, 0.15), 0 15px 35px rgba(30, 64, 175, 0.18);
    animation: logoFloat 3s ease-in-out infinite;
}

.loading-logo svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 4px 12px rgba(30, 64, 175, 0.3));
}

/* 使用图片时同样应用阴影 */
.loading-logo img {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 6px 18px rgba(30, 64, 175, 0.35));
}

/* Logo 浮动动画 */
@keyframes logoFloat {
    0%, 100% {
        transform: translateY(0px) scale(1);
    }
    50% {
        transform: translateY(-8px) scale(1.05);
    }
}

/* Logo 旋转动画（替代浮动） */
@keyframes logoSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Rotating rings animation */
.loading-rings {
    position: relative;
    width: 120px;
    height: 120px;
}

.loading-ring {
    position: absolute;
    border: 3px solid transparent;
    border-radius: 50%;
    animation: ringRotate 2s linear infinite;
}

.loading-ring:nth-child(1) {
    width: 120px;
    height: 120px;
    border-top-color: var(--primary-blue);
    border-right-color: var(--primary-blue);
    animation-duration: 2s;
    animation-delay: 0s;
}

.loading-ring:nth-child(2) {
    width: 90px;
    height: 90px;
    top: 15px;
    left: 15px;
    border-bottom-color: var(--secondary-blue);
    border-left-color: var(--secondary-blue);
    animation-duration: 1.5s;
    animation-delay: -0.5s;
    animation-direction: reverse;
}

.loading-ring:nth-child(3) {
    width: 60px;
    height: 60px;
    top: 30px;
    left: 30px;
    border-top-color: var(--light-blue);
    border-right-color: var(--light-blue);
    animation-duration: 1s;
    animation-delay: -1s;
}

/* Rotation animation */
@keyframes ringRotate {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* Pulsing dots animation */
.loading-dots {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.loading-dot {
    width: 12px;
    height: 12px;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    border-radius: 50%;
    animation: dotPulse 1.4s ease-in-out infinite both;
}

.loading-dot:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dot:nth-child(2) {
    animation-delay: -0.16s;
}

.loading-dot:nth-child(3) {
    animation-delay: 0s;
}

/* Dot pulse animation */
@keyframes dotPulse {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1.2);
        opacity: 1;
    }
}

/* Loading text */
.loading-text {
    font-family: var(--font-primary);
    font-size: 1.05rem;
    font-weight: 500;
    letter-spacing: 0.015em;
    color: var(--gray-600);
    text-align: center;
    max-width: 320px;
    animation: textFade 2.4s ease-in-out infinite;
}

[data-theme="dark"] .loading-text {
    color: var(--dark-text-secondary);
}

/* Text fade animation */
@keyframes textFade {
    0%, 100% {
        opacity: 0.6;
    }
    50% {
        opacity: 1;
    }
}

/* Wave loading animation */
.loading-waves {
    display: flex;
    gap: 4px;
    align-items: center;
}

.loading-wave {
    width: 4px;
    height: 20px;
    background: linear-gradient(to top, var(--primary-blue), var(--secondary-blue));
    border-radius: 2px;
    animation: waveMove 1.2s ease-in-out infinite;
}

.loading-wave:nth-child(1) { animation-delay: 0s; }
.loading-wave:nth-child(2) { animation-delay: 0.1s; }
.loading-wave:nth-child(3) { animation-delay: 0.2s; }
.loading-wave:nth-child(4) { animation-delay: 0.3s; }
.loading-wave:nth-child(5) { animation-delay: 0.4s; }

/* Wave animation */
@keyframes waveMove {
    0%, 40%, 100% {
        transform: scaleY(0.4);
        opacity: 0.7;
    }
    20% {
        transform: scaleY(1);
        opacity: 1;
    }
}

/* Progress bar animation */
.loading-progress {
    width: 200px;
    height: 4px;
    background: var(--gray-200);
    border-radius: 2px;
    overflow: hidden;
    position: relative;
}

[data-theme="dark"] .loading-progress {
    background: var(--gray-700);
}

.loading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-blue), var(--light-blue));
    border-radius: 2px;
    animation: progressMove 2s ease-in-out infinite;
}

/* Progress bar animation */
@keyframes progressMove {
    0% {
        transform: translateX(-100%);
        width: 0%;
    }
    50% {
        transform: translateX(0%);
        width: 100%;
    }
    100% {
        transform: translateX(100%);
        width: 0%;
    }
}

/* Responsive design */
@media (max-width: 768px) {
    .loading-logo {
        width: 72px;
        height: 72px;
    }
    
    .loading-rings {
        width: 100px;
        height: 100px;
    }
    
    .loading-ring:nth-child(1) {
        width: 100px;
        height: 100px;
    }
    
    .loading-ring:nth-child(2) {
        width: 75px;
        height: 75px;
        top: 12.5px;
        left: 12.5px;
    }
    
    .loading-ring:nth-child(3) {
        width: 50px;
        height: 50px;
        top: 25px;
        left: 25px;
    }
    
    .loading-text {
        font-size: 1rem;
    }
    
    .loading-progress {
        width: 150px;
    }
}

/* Mini loading animation (for buttons and small elements) */
.loading-mini {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--gray-600);
}

[data-theme="dark"] .loading-mini {
    color: var(--dark-text-secondary);
}

.loading-mini-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

[data-theme="dark"] .loading-mini-spinner {
    border-color: var(--gray-600);
    border-top-color: var(--primary-blue);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}