/* =====================================
   Fusion Seek Landing Page Styles
   Design inspired by Google NotebookLM & Apple
   ===================================== */

/* CSS Reset & Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Colors - NotebookLM Inspired Palette */
    --color-primary: #1a73e8;
    --color-primary-light: #4285f4;
    --color-primary-dark: #1557b0;
    --color-secondary: #8b5cf6;
    --color-accent: #06b6d4;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Neutral Colors */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Gradient Colors */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-success: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    
    /* Feature Card Colors */
    --color-git: #f97316;
    --color-ai: #8b5cf6;
    --color-formatter: #3b82f6;
    --color-time: #10b981;
    --color-encryption: #ef4444;
    --color-color: #f59e0b;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Cascadia Code', monospace;
    
    /* Font Sizes - Type Scale */
    --text-xs: 0.75rem;     /* 12px */
    --text-sm: 0.875rem;    /* 14px */
    --text-base: 1rem;      /* 16px */
    --text-lg: 1.125rem;    /* 18px */
    --text-xl: 1.25rem;     /* 20px */
    --text-2xl: 1.5rem;     /* 24px */
    --text-3xl: 1.875rem;   /* 30px */
    --text-4xl: 2.25rem;    /* 36px */
    --text-5xl: 3rem;       /* 48px */
    --text-6xl: 3.75rem;    /* 60px */
    
    /* Font Weights */
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    
    /* Spacing Scale */
    --space-1: 0.25rem;     /* 4px */
    --space-2: 0.5rem;      /* 8px */
    --space-3: 0.75rem;     /* 12px */
    --space-4: 1rem;        /* 16px */
    --space-5: 1.25rem;     /* 20px */
    --space-6: 1.5rem;      /* 24px */
    --space-8: 2rem;        /* 32px */
    --space-10: 2.5rem;     /* 40px */
    --space-12: 3rem;       /* 48px */
    --space-16: 4rem;       /* 64px */
    --space-20: 5rem;       /* 80px */
    --space-24: 6rem;       /* 96px */
    --space-32: 8rem;       /* 128px */
    
    /* Border Radius */
    --radius-sm: 0.25rem;   /* 4px */
    --radius-md: 0.375rem;  /* 6px */
    --radius-lg: 0.5rem;    /* 8px */
    --radius-xl: 0.75rem;   /* 12px */
    --radius-2xl: 1rem;     /* 16px */
    --radius-3xl: 1.5rem;   /* 24px */
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-base: 200ms ease-out;
    --transition-slow: 300ms ease-out;
    --transition-slower: 500ms ease-out;
    
    /* 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;
    --z-toast: 1080;
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height: 80px;
    --content-padding: var(--space-6);
}

/* Base HTML & Body */
html {
    scroll-behavior: smooth;
    text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background: var(--color-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--content-padding);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    line-height: 1.2;
    font-weight: var(--font-semibold);
    color: var(--color-gray-900);
    margin-bottom: var(--space-4);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
    margin-bottom: var(--space-4);
    color: var(--color-gray-600);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
}

/* Utility Classes */
.gradient-text {
    background: var(--gradient-primary);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% 200%;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
    position: relative;
    overflow: hidden;
}

.btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

.btn-glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-lg);
}

.btn-glass:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-toast);
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-animation {
    text-align: center;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-gray-200);
    border-top: 3px solid var(--color-primary);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-4);
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-gray-200);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: var(--font-bold);
    color: var(--color-gray-900);
}

.nav-logo {
    width: 32px;
    height: 32px;
}

.nav-title {
    font-size: var(--text-xl);
    font-family: var(--font-display);
}

.nav-menu {
    display: flex;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--space-6);
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--color-gray-600);
    font-weight: var(--font-medium);
    padding: var(--space-3) var(--space-4);
    position: relative;
    display: block;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    background: transparent;
}

.nav-link:hover {
    color: var(--color-primary);
    background: rgba(26, 115, 232, 0.08);
    transform: translateY(-1px);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: all var(--transition-base);
    transform: translateX(-50%);
    border-radius: var(--radius-full);
}

.nav-link:hover::after {
    width: 80%;
}

/* 增强交互反馈 */
.nav-item:hover .nav-link::after {
    width: 80%;
}

/* 防止闪烁的额外保护 */
.nav-item::before {
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    pointer-events: none;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-gray-600);
}

/* Main Content */
.main {
    margin-top: var(--header-height);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--gradient-primary);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.hero-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: var(--radius-full);
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background: var(--color-white);
    top: 20%;
    right: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background: var(--color-white);
    bottom: 20%;
    left: 5%;
    animation-delay: 2s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    background: var(--color-white);
    top: 60%;
    right: 30%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(10deg); }
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
    min-height: calc(100vh - var(--header-height));
}

.hero-text {
    color: var(--color-white);
}

.hero-title {
    font-size: var(--text-6xl);
    font-weight: var(--font-bold);
    line-height: 1.1;
    margin-bottom: var(--space-6);
}

.hero-subtitle {
    font-size: var(--text-xl);
    line-height: 1.6;
    margin-bottom: var(--space-8);
    color: rgba(255, 255, 255, 0.9);
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
}

.hero-stats {
    display: flex;
    gap: var(--space-8);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--color-white);
}

.stat-label {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.8);
}

.hero-visual {
    position: relative;
}

.hero-showcase {
    position: relative;
    perspective: 1000px;
}

.showcase-window {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
    transform: rotateY(-5deg) rotateX(5deg);
    transition: transform var(--transition-slow);
}

.showcase-window:hover {
    transform: rotateY(0deg) rotateX(0deg);
}

.window-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
}

.window-controls {
    display: flex;
    gap: var(--space-2);
}

.control {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
}

.control.close { background: #ff5f57; }
.control.minimize { background: #ffbd2e; }
.control.maximize { background: #28ca42; }

.window-title {
    font-weight: var(--font-medium);
    color: var(--color-gray-700);
}

.window-content {
    padding: var(--space-6);
    height: 400px;
}

.demo-interface {
    display: flex;
    height: 100%;
    gap: var(--space-4);
}

.demo-sidebar {
    width: 200px;
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
}

.demo-nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-2);
    color: var(--color-gray-600);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.demo-nav-item:hover,
.demo-nav-item.active {
    background: var(--color-white);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.demo-content {
    flex: 1;
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
}

.demo-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    height: 100%;
    box-shadow: var(--shadow-sm);
}

.demo-chart {
    width: 100%;
    height: 200px;
    background: var(--gradient-accent);
    border-radius: var(--radius-md);
    opacity: 0.6;
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-title {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-4);
}

.section-subtitle {
    font-size: var(--text-xl);
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* Features Section */
.features {
    padding: var(--space-20) 0;
    background: var(--color-gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-6);
}

.feature-card {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: var(--text-xl);
    transition: transform var(--transition-base);
}

.feature-card:hover .card-icon {
    transform: scale(1.1);
}

.git-icon { background: var(--color-git); }
.ai-icon { background: var(--color-ai); }
.formatter-icon { background: var(--color-formatter); }
.time-icon { background: var(--color-time); }
.encryption-icon { background: var(--color-encryption); }
.color-icon { background: var(--color-color); }

.card-title {
    font-size: var(--text-xl);
    margin: 0;
}

.card-content {
    margin-bottom: var(--space-4);
}

.card-description {
    margin-bottom: var(--space-4);
    line-height: 1.7;
}

.card-features {
    list-style: none;
    margin-bottom: var(--space-4);
}

.card-features li {
    position: relative;
    padding-left: var(--space-6);
    margin-bottom: var(--space-2);
    color: var(--color-gray-600);
}

.card-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: var(--font-bold);
}

.card-actions {
    display: flex;
    gap: var(--space-3);
}

/* Advantages Section */
.advantages {
    padding: var(--space-20) 0;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-8);
}

.advantage-item {
    text-align: center;
    padding: var(--space-6);
}

.advantage-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-4);
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: var(--text-3xl);
}

.advantage-title {
    margin-bottom: var(--space-3);
}

.advantage-description {
    color: var(--color-gray-600);
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform var(--transition-base);
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-gray-200);
}

.modal-title {
    margin: 0;
    font-size: var(--text-2xl);
}

.modal-close {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-gray-400);
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--color-gray-600);
}

.modal-body {
    padding: var(--space-6);
}

/* Footer */
.footer {
    background: var(--color-gray-900);
    color: var(--color-white);
    padding: var(--space-16) 0 var(--space-6);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-16);
    margin-bottom: var(--space-8);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    width: 40px;
    height: 40px;
    margin-bottom: var(--space-4);
}

.footer-description {
    color: var(--color-gray-400);
    margin: 0;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.footer-title {
    color: var(--color-white);
    margin-bottom: var(--space-4);
    font-size: var(--text-lg);
}

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

.footer-list li {
    margin-bottom: var(--space-2);
}

.footer-list a {
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

.footer-list a:hover {
    color: var(--color-white);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-gray-800);
    color: var(--color-gray-400);
}

.footer-social {
    display: flex;
    gap: var(--space-4);
}

.social-link {
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

.social-link:hover {
    color: var(--color-white);
}

/* Responsive Design */
@media (max-width: 1024px) {
    :root {
        --text-6xl: 3rem;
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-12);
        text-align: center;
    }
    
    .features-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --content-padding: var(--space-4);
        --text-6xl: 2.5rem;
        --text-5xl: 2rem;
        --text-4xl: 1.75rem;
    }
    
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: var(--text-5xl);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }
    
    .feature-card {
        padding: var(--space-4);
    }
    
    .card-header {
        gap: var(--space-2);
        margin-bottom: var(--space-3);
    }
    
    .card-icon {
        width: 40px;
        height: 40px;
        font-size: var(--text-lg);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

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

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #0056b3;
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    }
}

/* Dark Mode Support (Future Extension) */
@media (prefers-color-scheme: dark) {
    /* 
    Dark mode styles can be added here in the future
    Currently keeping light theme as per NotebookLM design
    */
}

/* Print Styles */
@media print {
    .header,
    .nav-toggle,
    .hero-actions,
    .card-actions,
    .modal,
    .footer {
        display: none !important;
    }
    
    .hero {
        background: none !important;
        color: black !important;
    }
    
    .btn {
        border: 1px solid black !important;
        background: none !important;
        color: black !important;
    }
}
/* Update and Install Banners */
.update-banner,
.install-banner {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--gradient-primary);
    color: var(--color-white);
    padding: var(--space-3);
    z-index: var(--z-toast);
    transform: translateY(-100%);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.update-banner.show,
.install-banner.show {
    transform: translateY(0);
}

.update-content,
.install-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--content-padding);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

.install-banner {
    background: var(--gradient-success);
}

/* Mobile Banner Styles */
@media (max-width: 768px) {
    .update-content,
    .install-content {
        flex-direction: column;
        gap: var(--space-2);
        text-align: center;
    }
    
    .update-content span,
    .install-content span {
        margin-bottom: var(--space-2);
    }
    
    .update-content button,
    .install-content button {
        margin: 0 var(--space-1);
    }
}