/* ==========================================
   Docker Dashboard Official Website
   Design System & Styles
   ========================================== */

/* ---------- CSS Variables ---------- */
:root {
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f9;
    --bg-code: #1e293b;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-code: #e2e8f0;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --accent: #2496ED;
    --accent-light: #0DB7ED;
    --accent-glow: rgba(36, 150, 237, 0.15);
    --success: #34D399;
    --warning: #FBBF24;
    --danger: #EF4444;
    --gradient-1: linear-gradient(135deg, #2496ED 0%, #0DB7ED 50%, #00D4AA 100%);
    --gradient-2: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-hero: linear-gradient(180deg, rgba(36,150,237,0.05) 0%, transparent 100%);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.04);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: rgba(30, 41, 59, 0.6);
    --bg-card-hover: rgba(51, 65, 85, 0.6);
    --bg-code: #0f172a;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-code: #e2e8f0;
    --border: rgba(71, 85, 105, 0.4);
    --border-light: rgba(71, 85, 105, 0.2);
    --accent-glow: rgba(36, 150, 237, 0.2);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5);
    --gradient-hero: linear-gradient(180deg, rgba(36,150,237,0.08) 0%, transparent 100%);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ---------- Navigation ---------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: all var(--transition);
    height: 64px;
}

.nav.scrolled {
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
}

.nav-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: opacity var(--transition);
}

.nav-logo:hover {
    opacity: 0.8;
}

.logo-icon {
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transition: width var(--transition);
}

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

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

.nav-icon {
    display: flex;
    align-items: center;
    opacity: 0.7;
    transition: opacity var(--transition);
}

.nav-icon:hover {
    opacity: 1;
}

.theme-toggle,
.lang-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition);
    font-size: 0.8rem;
    font-weight: 600;
}

.theme-toggle:hover,
.lang-toggle:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-glow);
}

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

.lang-label {
    user-select: none;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 4px;
}

.mobile-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--shadow-lg);
}

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

.mobile-menu a {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 8px 0;
    transition: color var(--transition);
}

.mobile-menu a:hover {
    color: var(--accent);
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    overflow: hidden;
    background: var(--gradient-hero);
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(36,150,237,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(36,150,237,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black, transparent);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black, transparent);
}

.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
}

.hero-orb-1 {
    width: 500px;
    height: 500px;
    background: var(--accent);
    top: -100px;
    right: -150px;
    animation: float 8s ease-in-out infinite;
}

.hero-orb-2 {
    width: 300px;
    height: 300px;
    background: #8B5CF6;
    bottom: 0;
    left: -100px;
    animation: float 10s ease-in-out infinite reverse;
}

.hero-orb-3 {
    width: 200px;
    height: 200px;
    background: var(--accent-light);
    top: 50%;
    left: 50%;
    animation: float 12s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, -50px) scale(1.1); }
    50% { transform: translate(-30px, -100px) scale(0.9); }
    75% { transform: translate(-50px, -20px) scale(1.05); }
}

.hero-content {
    position: relative;
    max-width: 800px;
    text-align: center;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--accent-glow);
    border: 1px solid rgba(36,150,237,0.2);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 32px;
    animation: fadeInUp 0.6s ease-out;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 60px;
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    opacity: 0;
    transform: translateY(20px) scale(0.9);
    transition: opacity 0.5s ease-out,
                transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.hero-stats.revealed .stat-item {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.hero-stats.revealed .stat-item:nth-child(1) { transition-delay: 0.05s; }
.hero-stats.revealed .stat-item:nth-child(2) { transition-delay: 0.12s; }
.hero-stats.revealed .stat-item:nth-child(3) { transition-delay: 0.19s; }
.hero-stats.revealed .stat-item:nth-child(4) { transition-delay: 0.26s; }
.hero-stats.revealed .stat-item:nth-child(5) { transition-delay: 0.33s; }
.hero-stats.revealed .stat-item:nth-child(6) { transition-delay: 0.40s; }

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.4s ease-out 0.15s,
                transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) 0.15s;
}

.hero-stats.revealed .stat-label {
    opacity: 1;
    transform: translateY(0);
}

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

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-1);
    color: #fff;
    box-shadow: 0 4px 15px rgba(36,150,237,0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(36,150,237,0.5);
}

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

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

/* ---------- Section Common ---------- */
section {
    padding: 100px 24px;
}

.section-header {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 64px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ---------- Features ---------- */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.feature-card {
    padding: 32px 28px;
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    border: 1px solid var(--border);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(36,150,237,0.3);
}

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

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--accent-glow);
    color: var(--accent);
    margin-bottom: 20px;
    transition: all var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
    background: rgba(36,150,237,0.2);
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ---------- Highlight ---------- */
.highlight {
    overflow: hidden;
}

.highlight-content {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.highlight-text h2 {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 32px;
}

.highlight-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.highlight-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.highlight-list li svg {
    flex-shrink: 0;
    margin-top: 2px;
}

/* Terminal Mockup */
.terminal-mockup {
    background: #0d1117;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255,255,255,0.1);
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
    font-size: 0.8rem;
    line-height: 1.8;
}

.terminal-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: #161b22;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

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

.term-dot-red { background: #FF5F56; }
.term-dot-yellow { background: #FFBD2E; }
.term-dot-green { background: #27C93F; }

.term-title {
    margin-left: 8px;
    font-size: 0.75rem;
    color: #8b949e;
    font-family: -apple-system, sans-serif;
}

.terminal-body {
    padding: 16px 20px;
}

.term-line {
    color: #c9d1d9;
}

.indent {
    padding-left: 16px;
}

.term-prompt {
    color: #27C93F;
    margin-right: 8px;
    font-weight: bold;
}

.term-flag {
    color: #79C0FF;
}

.term-line-success {
    color: #56D364;
}

.term-line-info {
    color: #58A6FF;
}

.term-line-comment {
    color: #8b949e;
    font-style: italic;
}

.term-comment-dim {
    color: #6e7681;
    font-style: italic;
}

.term-cursor {
    display: inline-block;
    background: #58A6FF;
    color: #0d1117;
    padding: 0 4px;
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* ---------- Quick Start ---------- */
.quickstart {
    background: var(--bg-secondary);
}

/* Tab Switcher */
.qs-tabs {
    display: flex;
    justify-content: center;
    gap: 4px;
    max-width: 420px;
    margin: 0 auto 40px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 4px;
    border: 1px solid var(--border);
}

.qs-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
}

.qs-tab:hover {
    color: var(--text-primary);
    background: var(--bg-card-hover);
}

.qs-tab.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 8px rgba(36, 150, 237, 0.3);
}

/* Tab Content Panels */
.qs-tab-content {
    display: none;
}

.qs-tab-content.active {
    display: block;
}

.qs-tab-desc {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 32px;
}

.qs-steps {
    max-width: 600px;
    margin: 0 auto;
}

.qs-step {
    display: flex;
    gap: 24px;
    padding: 28px 0;
}

.qs-step[data-animate] {
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.qs-step.visible {
    opacity: 1;
    transform: translateX(0);
}

.qs-step-num {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--gradient-1);
    color: #fff;
    font-weight: 800;
    font-size: 1.1rem;
}

.qs-step-content {
    flex: 1;
    min-width: 0;
}

.qs-step-content h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.qs-step-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.qs-step-content p code {
    background: rgba(245, 158, 11, 0.12);
    color: #D97706;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.85em;
    font-weight: 600;
}

.qs-connector {
    text-align: center;
    color: var(--accent);
    padding: 4px 0;
    opacity: 0.5;
}

.qs-checklist {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 8px;
}

.qs-checklist > li {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: all var(--transition);
}

.qs-checklist > li:hover {
    border-color: rgba(245, 158, 11, 0.3);
    box-shadow: var(--shadow-sm);
}

.qs-check-header {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 16px 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.qs-check-header svg {
    flex-shrink: 0;
    margin-top: 2px;
}

.qs-check-header code {
    background: rgba(245, 158, 11, 0.12);
    color: #D97706;
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 0.85em;
    font-weight: 600;
}

.qs-check-code {
    padding: 0 16px 14px;
}

/* --- Diff Code Block --- */
.code-diff {
    background: var(--bg-code);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255,255,255,0.05);
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
    font-size: 0.8rem;
    line-height: 1.75;
    padding: 10px 14px;
    overflow-x: auto;
}

.diff-context {
    color: #8b949e;
}

.diff-remove {
    color: #f85149;
    background: rgba(248, 81, 73, 0.08);
    margin: 0 -14px;
    padding: 0 14px;
}

.diff-add {
    color: #56D364;
    background: rgba(86, 211, 100, 0.08);
    margin: 0 -14px;
    padding: 0 14px;
}

.diff-mark {
    display: inline-block;
    width: 18px;
    font-weight: 700;
    user-select: none;
}

.code-diff .code-keyword {
    color: #79C0FF;
}

.code-diff .code-placeholder {
    color: #F59E0B;
    background: rgba(245, 158, 11, 0.1);
    padding: 1px 4px;
    border-radius: 3px;
    border-bottom: 1px dashed rgba(245, 158, 11, 0.4);
}

.code-label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 12px;
    margin-bottom: 4px;
    font-family: -apple-system, sans-serif;
}

.code-hint {
    flex-shrink: 0;
    font-size: 0.78rem;
    color: var(--text-muted);
    font-family: -apple-system, sans-serif;
    font-style: italic;
}

.qs-compose-preview {
    max-width: 600px;
    margin: 48px auto 0;
}

.qs-subtitle {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 16px;
    text-align: center;
}

.code-comment {
    color: #6A9955;
    font-style: italic;
}

.code-alert-dot {
    display: inline-block;
    vertical-align: middle;
    margin-right: 2px;
    margin-top: -1px;
}

.code-placeholder {
    color: #F59E0B;
    background: rgba(245, 158, 11, 0.1);
    padding: 1px 4px;
    border-radius: 3px;
    border-bottom: 1px dashed rgba(245, 158, 11, 0.4);
}

/* --- Important Notes Section --- */
.qs-notes {
    max-width: 960px;
    margin: 64px auto 0;
}

.qs-notes-title {
    font-size: 1.4rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.qs-notes-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 32px;
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.note-card {
    display: flex;
    gap: 16px;
    padding: 20px 22px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg-card);
    transition: all var(--transition);
}

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

.note-card-critical {
    grid-column: 1 / -1;
    border-color: rgba(239, 68, 68, 0.3);
    background: rgba(239, 68, 68, 0.04);
}

.note-card-critical .note-icon {
    color: #EF4444;
}

.note-card-warning {
    border-color: rgba(245, 158, 11, 0.25);
    background: rgba(245, 158, 11, 0.04);
}

.note-card-warning .note-icon {
    color: #F59E0B;
}

.note-card-info {
    border-color: rgba(36, 150, 237, 0.2);
    background: rgba(36, 150, 237, 0.03);
}

.note-card-info .note-icon {
    color: #2496ED;
}

.note-card-success {
    border-color: rgba(52, 211, 153, 0.2);
    background: rgba(52, 211, 153, 0.03);
}

.note-card-success .note-icon {
    color: #34D399;
}

.note-icon {
    flex-shrink: 0;
    margin-top: 1px;
}

.note-body h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.note-body p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

.note-body p code {
    background: var(--bg-secondary);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 0.88em;
    font-weight: 600;
    border: 1px solid var(--border-light);
}

/* ---------- Code Block ---------- */
.code-block {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-code);
    color: var(--text-code);
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
    font-size: 0.85rem;
    margin-top: 0;
    border: 1px solid rgba(255,255,255,0.05);
    overflow-x: auto;
    min-width: 0;
}

.code-block-lg {
    display: block;
    padding: 0;
}

.code-block-lg .code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.code-filename {
    font-size: 0.8rem;
    color: #8b949e;
    font-family: -apple-system, sans-serif;
}

.code-block-lg pre {
    padding: 16px 20px;
    overflow-x: auto;
}

.code-block-lg code {
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
    font-size: 0.82rem;
    line-height: 1.7;
}

.code-keyword {
    color: #79C0FF;
}

.code-text {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.code-highlight {
    color: #58A6FF;
}

.copy-btn {
    flex-shrink: 0;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 6px;
    padding: 6px;
    cursor: pointer;
    color: #8b949e;
    display: flex;
    align-items: center;
    transition: all var(--transition);
}

.copy-btn:hover {
    background: rgba(255,255,255,0.12);
    color: #e2e8f0;
}

.copy-btn.copied {
    color: var(--success);
    border-color: var(--success);
}

/* ---------- Architecture ---------- */
.architecture {
    overflow: hidden;
}

.arch-diagram {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.arch-diagram[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.arch-diagram.visible {
    opacity: 1;
    transform: translateY(0);
}

.arch-layer {
    padding: 28px 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    background: var(--bg-card);
    transition: all var(--transition);
}

.arch-layer:hover {
    border-color: rgba(36,150,237,0.3);
    box-shadow: var(--shadow-lg);
}

.arch-layer-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.arch-techs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.arch-tag {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
}

.arch-arrow, .arch-arrow-group {
    padding: 12px 0;
    color: var(--accent);
    opacity: 0.6;
}

.arch-arrow-group {
    display: flex;
    justify-content: center;
    gap: 200px;
}

.arch-layer-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

/* ---------- Footer ---------- */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 64px 24px 32px;
}

.footer-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    gap: 48px;
    flex-wrap: wrap;
}

.footer-logo {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.9rem;
    max-width: 320px;
}

.footer-links {
    display: flex;
    gap: 64px;
}

.footer-col h4 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
    transition: color var(--transition);
}

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

.footer-bottom {
    max-width: 1280px;
    margin: 48px auto 0;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ---------- Scroll Animation ---------- */
[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animation for grid items */
.features-grid .feature-card:nth-child(1) { transition-delay: 0.05s; }
.features-grid .feature-card:nth-child(2) { transition-delay: 0.1s; }
.features-grid .feature-card:nth-child(3) { transition-delay: 0.15s; }
.features-grid .feature-card:nth-child(4) { transition-delay: 0.2s; }
.features-grid .feature-card:nth-child(5) { transition-delay: 0.1s; }
.features-grid .feature-card:nth-child(6) { transition-delay: 0.15s; }
.features-grid .feature-card:nth-child(7) { transition-delay: 0.2s; }
.features-grid .feature-card:nth-child(8) { transition-delay: 0.25s; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .qs-notes {
        max-width: 640px;
    }

    .highlight-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .arch-arrow-group {
        gap: 80px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-stats {
        gap: 24px;
    }

    .qs-tabs {
        max-width: 100%;
    }

    .qs-tab {
        font-size: 0.8rem;
        padding: 10px 14px;
        gap: 4px;
    }

    .qs-tab svg {
        width: 16px;
        height: 16px;
    }

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

    .arch-layer-group {
        grid-template-columns: 1fr;
    }

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

    .note-card-critical {
        grid-column: 1;
    }

    .qs-step {
        padding: 20px 0;
    }

    .footer-inner {
        flex-direction: column;
        gap: 32px;
    }

    .footer-links {
        gap: 32px;
        flex-wrap: wrap;
    }

    .highlight-content {
        gap: 24px;
    }

    section {
        padding: 64px 16px;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .btn {
        padding: 10px 22px;
        font-size: 0.9rem;
    }
}