/* ============================================
   madOS — Professional Dark Theme
   Nord color palette, cohesive design
   ============================================ */

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

:root {
    /* Nord Palette */
    --nord0: #2e3440;
    --nord1: #3b4252;
    --nord2: #434c5e;
    --nord3: #4c566a;
    --nord4: #d8dee9;
    --nord5: #e5e9f0;
    --nord6: #eceff4;
    --nord7: #8fbcbb;
    --nord8: #88c0d0;
    --nord9: #81a1c1;
    --nord10: #5e81ac;
    --nord11: #bf616a;
    --nord12: #d08770;
    --nord13: #ebcb8b;
    --nord14: #a3be8c;
    --nord15: #b48ead;

    /* Semantic */
    --bg-base: #0d1117;
    --bg-surface: #161b22;
    --bg-elevated: #1c2128;
    --bg-overlay: #21262d;
    --border: rgba(136, 192, 208, 0.08);
    --border-hover: rgba(136, 192, 208, 0.2);
    --text-primary: #eceff4;
    --text-secondary: #d8dee9;
    --text-muted: rgba(216, 222, 233, 0.6);
    --accent: #88c0d0;
    --accent-light: #93cdd9;
    --accent-dim: rgba(136, 192, 208, 0.15);

    /* Fonts */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

    /* Spacing scale */
    --s1: 0.25rem;
    --s2: 0.5rem;
    --s3: 0.75rem;
    --s4: 1rem;
    --s5: 1.5rem;
    --s6: 2rem;
    --s7: 3rem;
    --s8: 4rem;
    --s9: 6rem;
    --s10: 8rem;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

::selection {
    background: var(--accent);
    color: var(--bg-base);
}

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   Container
   ============================================ */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 var(--s6);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(13, 17, 23, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s, box-shadow 0.3s;
}

.navbar.scrolled {
    background: rgba(13, 17, 23, 0.95);
    box-shadow: 0 1px 12px rgba(0, 0, 0, 0.4);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.nav-brand .logo-img {
    height: 32px;
    width: auto;
    transition: opacity 0.2s;
}

.nav-brand:hover .logo-img {
    opacity: 0.85;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: var(--s5);
}

.nav-menu a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: color 0.2s;
}

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

.nav-github {
    display: inline-flex;
    align-items: center;
    gap: var(--s2);
    padding: var(--s2) var(--s3);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: border-color 0.2s, background 0.2s;
}

.nav-github:hover {
    background: var(--bg-overlay);
    border-color: var(--border-hover);
}

.nav-github svg {
    opacity: 0.8;
}

.lang-selector {
    display: flex;
    gap: 2px;
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    padding: 2px;
    border: 1px solid var(--border);
}

.lang-option {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--s1) var(--s3);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-sans);
    letter-spacing: 0.05em;
    transition: all 0.2s;
}

.lang-option:hover {
    color: var(--text-primary);
}

.lang-option.active {
    background: var(--accent);
    color: var(--bg-base);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--s2);
}

.mobile-menu-toggle span {
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: all 0.3s;
}

/* ============================================
   Hero
   ============================================ */
.hero {
    position: relative;
    padding: calc(64px + var(--s9)) 0 var(--s9);
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: -200px;
    right: -100px;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(136, 192, 208, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--s8);
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: var(--s2) var(--s4);
    background: var(--accent-dim);
    border: 1px solid rgba(136, 192, 208, 0.2);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: var(--s6);
    letter-spacing: 0.02em;
}

.hero-title {
    margin-bottom: var(--s4);
}

.hero-logo {
    max-width: 260px;
    height: auto;
}

.hero-tagline {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--s5);
    letter-spacing: -0.01em;
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: var(--s7);
    max-width: 480px;
}

.hero-cta {
    display: flex;
    gap: var(--s4);
    margin-bottom: var(--s8);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--s2);
    padding: 0.7rem 1.4rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-base);
}

.btn-primary:hover {
    background: #7ab3c3;
    box-shadow: 0 4px 20px rgba(136, 192, 208, 0.25);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-hover);
}

.btn-outline:hover {
    background: var(--bg-elevated);
    border-color: var(--accent);
    color: var(--text-primary);
}

/* Stats */
.hero-stats {
    display: flex;
    align-items: center;
    gap: var(--s6);
}

.stat-divider {
    width: 1px;
    height: 32px;
    background: var(--border-hover);
}

.stat-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    font-variant-numeric: tabular-nums;
}

.stat-unit {
    font-size: 1rem;
    font-weight: 500;
    color: var(--accent);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: var(--s1);
}

/* Terminal */
.hero-visual {
    position: relative;
}

.terminal-window {
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow:
        0 0 0 1px rgba(136, 192, 208, 0.05),
        0 20px 60px -10px rgba(0, 0, 0, 0.5);
}

.terminal-header {
    background: var(--bg-elevated);
    padding: var(--s3) var(--s4);
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.terminal-dots {
    display: flex;
    gap: 6px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot-red { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green { background: #28c840; }

.terminal-title {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.terminal-body {
    padding: var(--s5) var(--s6);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.7;
    min-height: 280px;
}

.terminal-line {
    margin-bottom: var(--s2);
}

.t-prompt { color: var(--nord14); font-weight: 500; }
.t-cmd { color: var(--text-primary); }
.t-output { color: var(--text-muted); }
.t-accent { color: var(--accent); font-weight: 500; }
.t-muted { color: var(--nord3); }
.t-label { color: var(--nord9); }
.t-success { color: var(--nord14); }
.t-info { color: var(--accent); }

.neofetch-output {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.t-cursor {
    display: inline-block;
    width: 7px;
    height: 14px;
    background: var(--accent);
    animation: blink 1s step-end infinite;
    vertical-align: text-bottom;
}

@keyframes blink {
    50% { opacity: 0; }
}

/* ============================================
   Section Shared Styles
   ============================================ */
.section-header {
    text-align: center;
    margin-bottom: var(--s8);
}

.section-label {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
    margin-bottom: var(--s3);
    padding: var(--s1) var(--s3);
    background: var(--accent-dim);
    border-radius: 100px;
}

.section-header h2 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--s3);
    color: var(--text-primary);
}

.section-header p {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 540px;
    margin: 0 auto;
}

/* ============================================
   Features
   ============================================ */
.features {
    padding: var(--s9) 0;
    background: var(--bg-surface);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--s4);
}

.feature-card {
    padding: var(--s6);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg-base);
    transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.feature-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-dim);
    border-radius: var(--radius-sm);
    margin-bottom: var(--s4);
    color: var(--accent);
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--s2);
    color: var(--text-primary);
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ============================================
   Showcase (Desktop + Apps)
   ============================================ */
.showcase {
    padding: var(--s9) 0;
}

.showcase-preview {
    margin-bottom: var(--s8);
}

.preview-frame {
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--bg-surface);
    box-shadow: 0 20px 60px -10px rgba(0, 0, 0, 0.4);
}

.preview-bar {
    display: flex;
    align-items: center;
    padding: var(--s3) var(--s4);
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
}

.preview-dots {
    display: flex;
    gap: 6px;
}

.preview-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.preview-dots span:nth-child(1) { background: #ff5f57; }
.preview-dots span:nth-child(2) { background: #febc2e; }
.preview-dots span:nth-child(3) { background: #28c840; }

.preview-title {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.preview-image {
    display: block;
    width: 100%;
    height: auto;
}

/* App groups */
.showcase-apps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--s4);
}

.app-group {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--s5);
}

.app-group h3 {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: var(--s4);
    padding-bottom: var(--s3);
    border-bottom: 1px solid var(--border);
}

.app-list {
    display: flex;
    flex-direction: column;
    gap: var(--s3);
}

.app-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: 0.875rem;
}

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

.app-item span {
    color: var(--text-muted);
    font-size: 0.8rem;
    text-align: right;
}

/* ============================================
   Hardware
   ============================================ */
.hardware {
    padding: var(--s9) 0;
    background: var(--bg-surface);
}

.hardware-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--s7);
    align-items: start;
}

.hardware-specs {
    display: flex;
    flex-direction: column;
    gap: var(--s3);
}

.spec-item {
    display: flex;
    align-items: center;
    gap: var(--s4);
    padding: var(--s4) var(--s5);
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: border-color 0.2s;
}

.spec-item:hover {
    border-color: var(--border-hover);
}

.spec-icon-wrap {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-dim);
    border-radius: var(--radius-sm);
    color: var(--accent);
    flex-shrink: 0;
}

.spec-item strong {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.spec-item p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.4;
}

/* System Monitor */
.system-monitor {
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--s5);
}

.monitor-header {
    display: flex;
    align-items: center;
    gap: var(--s2);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--s5);
    padding-bottom: var(--s3);
    border-bottom: 1px solid var(--border);
}

.monitor-stat {
    margin-bottom: var(--s5);
}

.monitor-stat:last-child {
    margin-bottom: 0;
}

.monitor-meta {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--s2);
}

.monitor-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.monitor-value {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-weight: 500;
}

.monitor-bar {
    height: 6px;
    background: var(--bg-overlay);
    border-radius: 3px;
    overflow: hidden;
}

.monitor-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--nord9));
    border-radius: 3px;
    transition: width 1s ease-out;
}

.monitor-bar-success {
    background: linear-gradient(90deg, var(--nord14), var(--nord7));
}

.monitor-bar-warning {
    background: linear-gradient(90deg, var(--nord13), var(--nord12));
}

/* ============================================
   Download
   ============================================ */
.download {
    padding: var(--s9) 0;
    position: relative;
}

.download::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(136, 192, 208, 0.06) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.download > .container {
    position: relative;
    z-index: 1;
}

.download-hero {
    margin-bottom: var(--s8);
}

.download-card {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--s7);
    align-items: center;
    background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
    border: 1px solid rgba(136, 192, 208, 0.12);
    border-radius: var(--radius-xl);
    padding: var(--s8);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2), 0 0 60px rgba(136, 192, 208, 0.04);
}

.download-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle at top right, rgba(136, 192, 208, 0.06), transparent 60%);
    pointer-events: none;
}

.download-info h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: var(--s2);
    color: var(--text-primary);
}

.download-info p {
    color: var(--text-muted);
    margin-bottom: var(--s6);
    font-size: 0.95rem;
}

.btn-download {
    padding: 1rem 2.5rem;
    font-size: 1.05rem;
    background: linear-gradient(135deg, var(--accent) 0%, var(--nord9) 100%);
    color: var(--bg-base);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 15px rgba(136, 192, 208, 0.3), 0 0 30px rgba(136, 192, 208, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(136, 192, 208, 0.4), 0 0 50px rgba(136, 192, 208, 0.15);
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--nord9) 100%);
}

.btn-download svg {
    transition: transform 0.3s ease;
}

.btn-download:hover svg {
    transform: translateY(2px);
}

.download-checksums {
    display: inline-flex;
    align-items: center;
    gap: var(--s2);
    margin-top: var(--s4);
    font-size: 0.8rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
    padding: var(--s2) 0;
}

.download-checksums::before {
    content: '';
    display: inline-block;
    width: 14px;
    height: 14px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='rgba(216,222,233,0.6)' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 12l2 2 4-4'/%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3C/svg%3E");
    flex-shrink: 0;
    transition: filter 0.2s;
}

.download-checksums:hover {
    color: var(--accent);
}

.download-checksums:hover::before {
    filter: brightness(1.3) saturate(1.5);
}

.download-meta {
    display: flex;
    flex-direction: column;
    gap: var(--s5);
    padding-left: var(--s7);
    border-left: 1px solid rgba(136, 192, 208, 0.1);
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: var(--s3) var(--s4);
    border-radius: var(--radius-sm);
    background: rgba(136, 192, 208, 0.03);
    border: 1px solid rgba(136, 192, 208, 0.05);
    transition: background 0.2s;
}

.meta-item:hover {
    background: rgba(136, 192, 208, 0.06);
}

.meta-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    font-weight: 600;
    opacity: 0.7;
}

.meta-value {
    font-size: 0.875rem;
    color: var(--text-primary);
    font-weight: 500;
    font-family: var(--font-mono);
}

/* Installation Steps */
.install-steps {
    background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-elevated) 100%);
    border: 1px solid rgba(136, 192, 208, 0.08);
    border-radius: var(--radius-xl);
    padding: var(--s8);
}

.install-steps h3 {
    text-align: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--s7);
    color: var(--text-primary);
}

.steps-timeline {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--s5);
    position: relative;
}

.steps-timeline::before {
    content: '';
    position: absolute;
    top: 24px;
    left: calc(12.5% + 10px);
    right: calc(12.5% + 10px);
    height: 2px;
    background: linear-gradient(90deg, rgba(136, 192, 208, 0.1), rgba(136, 192, 208, 0.2), rgba(136, 192, 208, 0.1));
    z-index: 0;
}

.step {
    text-align: center;
    position: relative;
    padding: var(--s4);
    border-radius: var(--radius-md);
    transition: background 0.3s;
}

.step:hover {
    background: rgba(136, 192, 208, 0.04);
}

.step-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-dim), rgba(136, 192, 208, 0.25));
    color: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 auto var(--s4);
    border: 2px solid rgba(136, 192, 208, 0.25);
    position: relative;
    z-index: 1;
    box-shadow: 0 2px 10px rgba(136, 192, 208, 0.1);
    transition: all 0.3s;
}

.step:hover .step-number {
    box-shadow: 0 4px 20px rgba(136, 192, 208, 0.2);
    border-color: rgba(136, 192, 208, 0.4);
    transform: scale(1.05);
}

.step-content h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--s2);
    color: var(--text-primary);
}

.step-content code {
    display: block;
    background: var(--bg-base);
    padding: var(--s2) var(--s3);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent);
    margin-top: var(--s2);
    border: 1px solid var(--border);
}

.step-content p {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--s8) 0 var(--s6);
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: var(--s7);
    border-bottom: 1px solid var(--border);
    margin-bottom: var(--s6);
}

.footer-logo {
    height: 36px;
    width: auto;
    margin-bottom: var(--s3);
    opacity: 0.9;
}

.footer-brand p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: var(--s9);
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: var(--s3);
}

.footer-col h4 {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    margin-bottom: var(--s1);
}

.footer-col a {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-col a:hover {
    color: var(--accent);
}

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: var(--s7);
    }

    .hero-visual {
        max-width: 560px;
    }

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

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

    .download-card {
        grid-template-columns: 1fr;
    }

    .download-meta {
        flex-direction: row;
        padding-left: 0;
        border-left: none;
        padding-top: var(--s5);
        border-top: 1px solid rgba(136, 192, 208, 0.1);
        gap: var(--s4);
    }

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

@media (max-width: 768px) {
    .container {
        padding: 0 var(--s4);
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-surface);
        flex-direction: column;
        padding: var(--s4);
        border-top: 1px solid var(--border);
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
        gap: var(--s3);
    }

    .nav-menu.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .lang-selector {
        align-self: center;
        margin-top: var(--s2);
    }

    .hero {
        padding: calc(64px + var(--s7)) 0 var(--s7);
    }

    .hero-logo {
        max-width: 200px;
    }

    .hero-tagline {
        font-size: 1.25rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-stats {
        gap: var(--s4);
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }

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

    .showcase-apps {
        grid-template-columns: 1fr;
    }

    .steps-timeline {
        grid-template-columns: 1fr;
    }

    .steps-timeline::before {
        display: none;
    }

    .footer-top {
        flex-direction: column;
        gap: var(--s7);
    }

    .footer-links {
        gap: var(--s7);
    }
}

@media (max-width: 480px) {
    .hero-logo {
        max-width: 160px;
    }

    .hero-tagline {
        font-size: 1.1rem;
    }

    .hero-stats {
        flex-wrap: wrap;
    }

    .stat-divider {
        display: none;
    }

    .stat {
        min-width: 80px;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .download-card {
        padding: var(--s5);
    }

    .download-meta {
        flex-direction: column;
    }

    .footer-links {
        flex-wrap: wrap;
    }
}