/* ========================================
   SpeakAI H5 - AI Tech Dark Theme
   Pure CSS, No Framework, Mobile-First
   ======================================== */

/* CSS Variables */
:root {
    --primary-color: #00d4ff;
    --primary-dark: #00a8cc;
    --primary-light: #5ce1ff;
    --secondary-color: #7c3aed;
    --accent-color: #a855f7;
    --accent-cyan: #06b6d4;
    --accent-blue: #3b82f6;

    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);
    --gradient-hero: linear-gradient(160deg, #020617 0%, #0c1445 40%, #1a0a3e 70%, #020617 100%);
    --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
    --gradient-glow: linear-gradient(135deg, rgba(0,212,255,0.15) 0%, rgba(124,58,237,0.15) 100%);
    --gradient-stats: linear-gradient(135deg, #0c1445 0%, #1a0a3e 100%);
    --gradient-button: linear-gradient(135deg, #00d4ff 0%, #3b82f6 50%, #7c3aed 100%);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-light: #64748b;
    --bg-dark: #020617;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    --bg-light: #0f172a;
    --bg-section: #0a0f2e;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(0, 212, 255, 0.3);

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.15);
    --shadow-glow-purple: 0 0 30px rgba(124, 58, 237, 0.15);

    --transition-fast: 150ms ease;
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Global Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI',
                 'Inter', 'Roboto', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-dark);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ============ Navigation ============ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(2, 6, 23, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(2, 6, 23, 0.92);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5), 0 0 1px rgba(0, 212, 255, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-base);
    letter-spacing: -0.02em;
}

.nav-logo:hover {
    color: var(--primary-color);
}

.logo-img {
    height: 36px;
    width: 36px;
    object-fit: contain;
    border-radius: 8px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition-base);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
    border-radius: 1px;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.nav-menu a:hover::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-base);
    border-radius: 1px;
}

/* ============ Buttons ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.75rem;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--gradient-button);
    background-size: 200% 200%;
    color: white;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.4);
    background-position: 100% 0;
}

.btn-primary::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.btn-primary:hover::after {
    opacity: 1;
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 1.5px solid var(--border-glow);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(0, 212, 255, 0.08);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.btn-sm {
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2.25rem;
    font-size: 1.1rem;
}

.btn-icon {
    padding: 0.75rem;
    width: 48px;
    height: 48px;
}

.btn img.btn-icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    padding: 0;
    margin-right: 0.5rem;
    vertical-align: middle;
    margin-top: -2px;
    filter: brightness(0) invert(1);
}

/* ============ Layout ============ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 6rem 0;
    position: relative;
}

.section-sm { padding: var(--spacing-xl) 0; }
.section-lg { padding: 8rem 0; }

/* ============ Hero Section ============ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    color: var(--text-primary);
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 800px 600px at 20% 40%, rgba(0, 212, 255, 0.08) 0%, transparent 70%),
        radial-gradient(ellipse 600px 500px at 75% 60%, rgba(124, 58, 237, 0.1) 0%, transparent 70%),
        radial-gradient(ellipse 400px 300px at 50% 80%, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
    animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { opacity: 0.7; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.05); }
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
    animation: gridPulse 6s ease-in-out infinite alternate;
}

@keyframes gridPulse {
    0% { opacity: 0.4; }
    100% { opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 860px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: rgba(0, 212, 255, 0.08);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 2rem;
    animation: fadeInDown 0.8s ease-out;
    backdrop-filter: blur(10px);
}

.hero-badge-dot {
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
    box-shadow: 0 0 8px var(--primary-color);
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
    font-size: clamp(2.75rem, 6vw, 4.5rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    animation: fadeInUp 0.8s ease-out;
    letter-spacing: -0.03em;
}

.hero h1 .text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    margin-bottom: 2.5rem;
    color: var(--text-secondary);
    line-height: 1.7;
    animation: fadeInUp 0.8s ease-out 0.2s both;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* Floating orbs decoration */
.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    pointer-events: none;
    z-index: 0;
}

.hero-orb-1 {
    width: 400px;
    height: 400px;
    background: rgba(0, 212, 255, 0.06);
    top: 10%;
    left: -5%;
    animation: orbFloat 12s ease-in-out infinite;
}

.hero-orb-2 {
    width: 350px;
    height: 350px;
    background: rgba(124, 58, 237, 0.08);
    bottom: 10%;
    right: -5%;
    animation: orbFloat 10s ease-in-out infinite reverse;
}

.hero-orb-3 {
    width: 200px;
    height: 200px;
    background: rgba(59, 130, 246, 0.06);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: orbFloat 14s ease-in-out infinite;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0); }
    25% { transform: translate(20px, -30px); }
    50% { transform: translate(-15px, 20px); }
    75% { transform: translate(25px, 15px); }
}

/* ============ Grid Layouts ============ */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* ============ Cards - Glassmorphism ============ */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 2rem;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(0, 212, 255, 0.3) 50%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    border-color: rgba(0, 212, 255, 0.15);
    box-shadow: var(--shadow-glow);
}

.card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    position: relative;
}

.card-icon.icon-cyan {
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.15);
    color: var(--primary-color);
}

.card-icon.icon-purple {
    background: rgba(124, 58, 237, 0.1);
    border: 1px solid rgba(124, 58, 237, 0.15);
    color: var(--accent-color);
}

.card-icon.icon-blue {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.15);
    color: var(--accent-blue);
}

.card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* ============ Section Titles ============ */
.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.section-title p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* ============ Stats Section ============ */
.stats {
    background: var(--gradient-stats);
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}

.stats::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 500px 400px at 30% 50%, rgba(0, 212, 255, 0.06) 0%, transparent 70%),
        radial-gradient(ellipse 500px 400px at 70% 50%, rgba(124, 58, 237, 0.06) 0%, transparent 70%);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
    position: relative;
    z-index: 1;
}

.stat-item {
    padding: 2rem;
}

.stat-item h3 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.stat-item p {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ============ Download Cards ============ */
.download-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
    text-decoration: none;
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.download-card:hover {
    border-color: var(--border-glow);
    background: var(--bg-card-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.download-icon {
    font-size: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.download-icon-img {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.download-text h4 {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.2rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.download-text p {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ============ Content Page Styles ============ */
.content-page {
    padding-top: 100px;
    padding-bottom: 4rem;
    min-height: 100vh;
    background: var(--bg-dark);
}

.content-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.page-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 2rem;
    text-align: center;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.content-section {
    margin-bottom: 3rem;
}

.content-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid rgba(0, 212, 255, 0.3);
}

.content-section h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin: 1.5rem 0 1rem;
    color: var(--text-primary);
}

.content-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 1rem 0 0.75rem;
    color: var(--primary-color);
}

.content-section p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.content-section ul,
.content-section ol {
    margin: 1rem 0 1rem 2rem;
    color: var(--text-secondary);
}

.content-section li {
    margin-bottom: 0.75rem;
    line-height: 1.8;
}

.content-section strong {
    color: var(--text-primary);
    font-weight: 600;
}

.content-section a {
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 1px solid rgba(0, 212, 255, 0.3);
    transition: all var(--transition-fast);
}

.content-section a:hover {
    border-bottom-color: var(--primary-color);
}

/* ============ Alert Boxes ============ */
.alert {
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    margin: 2rem 0;
    border-left: 3px solid;
    backdrop-filter: blur(10px);
}

.alert-info {
    background: rgba(0, 212, 255, 0.05);
    border-color: var(--primary-color);
    color: var(--primary-light);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.05);
    border-color: #f59e0b;
    color: #fbbf24;
}

.alert-success {
    background: rgba(16, 185, 129, 0.05);
    border-color: #10b981;
    color: #34d399;
}

/* ============ Footer ============ */
.footer {
    background: var(--bg-light);
    color: white;
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.footer-section h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

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

.footer-section li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-size: 0.95rem;
}

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

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

.footer-bottom a {
    color: var(--text-secondary);
    text-decoration: none;
    margin: 0 0.5rem;
}

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

/* ============ Back to Top ============ */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-card);
    color: var(--primary-color);
    border: 1px solid var(--border-glow);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 999;
    font-size: 1.2rem;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    background: rgba(0, 212, 255, 0.1);
}

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

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

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

.fade-in-up { animation: fadeInUp 0.6s ease-out both; }
.fade-in-down { animation: fadeInDown 0.6s ease-out both; }
.slide-in-left { animation: slideInLeft 0.6s ease-out both; }

/* Scroll-triggered animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============ Feature Icon SVGs ============ */
.feature-icon {
    width: 28px;
    height: 28px;
    stroke-width: 1.5;
    fill: none;
    stroke: currentColor;
}

/* ============ Particle Canvas ============ */
#particles-canvas {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
}

/* ============ Utility Classes ============ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }

/* ============ Responsive Design ============ */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        left: -100%;
        width: 80%;
        height: 100vh;
        background: rgba(2, 6, 23, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: flex-start;
        padding: 5rem 2rem;
        box-shadow: var(--shadow-xl);
        transition: left var(--transition-base);
        border-right: 1px solid var(--border-color);
    }

    .nav-menu.active {
        left: 0;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding: 7rem 0 5rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .section {
        padding: 4rem 0;
    }

    .section-title {
        margin-bottom: 3rem;
    }

    .grid { gap: 1.25rem; }

    .stats { padding: 3rem 0; }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .download-card {
        flex-direction: column;
        text-align: center;
    }

    .back-to-top {
        bottom: 1rem;
        right: 1rem;
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0.75rem 1rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-item h3 {
        font-size: 2.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 2.25rem;
    }
}

/* ============ Dark Mode is Default ============ */
/* Light mode override for content pages if needed */
@media (prefers-color-scheme: light) {
    .content-page {
        /* Keep dark theme regardless */
    }
}

/* ============ Print Styles ============ */
@media print {
    .navbar, .footer, .back-to-top, .hero-cta, #particles-canvas {
        display: none;
    }

    .hero {
        min-height: auto;
        padding: 2rem 0;
        background: white;
        color: black;
    }

    .content-page {
        padding-top: 0;
        background: white;
    }

    body {
        background: white;
        color: black;
    }
}