/* ============================================
   Keel — High-Performance Database Proxy
   Official Website Styles
   ============================================ */

/* ---- CSS Variables / Theming ---- */
:root {
    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-dark: #4f46e5;
    --success: #22c55e;
    --warning: #f59e0b;
    --info: #06b6d4;
    --danger: #ef4444;

    --bg-primary: #0f0f14;
    --bg-secondary: #16161d;
    --bg-tertiary: #1e1e28;
    --bg-card: #1a1a24;
    --bg-hover: #252530;

    --text-primary: #f1f1f4;
    --text-secondary: #a0a0b8;
    --text-muted: #6b6b82;

    --border: #2a2a38;
    --border-light: #35354a;

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

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 40px rgba(99,102,241,0.15);

    --nav-height: 64px;
    --container-max: 1200px;
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* Light theme */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fc;
    --bg-tertiary: #f1f3f8;
    --bg-card: #ffffff;
    --bg-hover: #eef0f6;

    --text-primary: #1a1a2e;
    --text-secondary: #4a4a62;
    --text-muted: #8888a0;

    --border: #e2e4ec;
    --border-light: #d0d2dc;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 40px rgba(99,102,241,0.08);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
}

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

a:hover {
    color: var(--accent-light);
}

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

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

/* ---- Container ---- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Navigation ---- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    background: transparent;
    transition: background var(--transition-base), box-shadow var(--transition-base), backdrop-filter var(--transition-base);
}

.navbar.scrolled {
    background: rgba(15, 15, 20, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    box-shadow: 0 1px 0 var(--border);
}

[data-theme="light"] .navbar.scrolled {
    background: rgba(255, 255, 255, 0.85);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.2rem;
}

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

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

.logo-image {
    width: 32px;
    height: 32px;
    object-fit: contain;
    flex-shrink: 0;
}

.logo-text {
    letter-spacing: -0.02em;
}

.footer-logo-image {
    width: 24px;
    height: 24px;
    object-fit: contain;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
}

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

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

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

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

.nav-theme-toggle {
    margin-left: 8px;
}

.theme-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.theme-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.theme-icon-moon {
    display: none;
}

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

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

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ---- Hero Section ---- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: calc(var(--nav-height) + 40px) 24px 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 0;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99,102,241,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99,102,241,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
}

.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: orbFloat 20s ease-in-out infinite;
}

.hero-orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(99,102,241,0.3), transparent 70%);
    top: -10%;
    right: -5%;
    animation-delay: 0s;
}

.hero-orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(6,182,212,0.25), transparent 70%);
    bottom: -5%;
    left: -5%;
    animation-delay: -7s;
}

.hero-orb-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(139,92,246,0.2), transparent 70%);
    top: 40%;
    left: 50%;
    animation-delay: -14s;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -40px) scale(1.05); }
    66% { transform: translate(-20px, 30px) scale(0.95); }
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 100px;
    padding: 6px 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.title-line {
    display: block;
}

.title-line.accent {
    background: linear-gradient(135deg, var(--accent), var(--info));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 56px;
}

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

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 12px rgba(99,102,241,0.3);
}

.btn-primary:hover {
    background: var(--accent-dark);
    box-shadow: 0 4px 20px rgba(99,102,241,0.4);
    transform: translateY(-1px);
    color: #fff;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-light);
    color: var(--text-primary);
}

.hero-stats {
    display: flex;
    gap: 40px;
    justify-content: center;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.8rem;
    animation: scrollBounce 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: rotate(45deg);
}

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ---- Section Headers ---- */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    background: rgba(99,102,241,0.1);
    border: 1px solid rgba(99,102,241,0.2);
    padding: 4px 14px;
    border-radius: 100px;
    margin-bottom: 20px;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ---- Features Section ---- */
.features {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

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

.feature-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

.feature-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: rgba(99,102,241,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    margin-bottom: 20px;
}

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

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

/* ---- Architecture Section ---- */
.architecture {
    padding: 100px 0;
}

.arch-diagram {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 64px;
    overflow-x: auto;
}

.arch-legend {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 14px;
    height: 14px;
    border-radius: 3px;
}

.legend-worker { background: var(--accent); }
.reactor-color { background: var(--info); }
.pool-color { background: var(--success); }
.session-color { background: var(--warning); }

.arch-visual {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.arch-group-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-family: var(--font-mono);
}

.arch-workers {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.arch-worker {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.arch-worker-header {
    padding: 8px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-hover);
    border-bottom: 1px solid var(--border);
    font-family: var(--font-mono);
}

.arch-worker-body {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
}

.arch-reactor {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--info);
    opacity: 0.6;
}

.arch-pool {
    width: 40px;
    height: 40px;
    border-radius: 6px;
    background: var(--success);
    opacity: 0.5;
}

.arch-sessions {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    justify-content: center;
}

.arch-session-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--warning);
    opacity: 0.7;
}

/* Worker Anatomy */
.worker-anatomy {
    margin-top: 48px;
}

.anatomy-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 32px;
}

.anatomy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.anatomy-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: all var(--transition-base);
}

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

.anatomy-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
    opacity: 0.3;
    font-family: var(--font-mono);
    margin-bottom: 8px;
}

.anatomy-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.anatomy-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ---- Reactor Section ---- */
.reactor-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.reactor-selector {
    margin-bottom: 64px;
}

.reactor-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.reactor-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
}

.reactor-tab:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.reactor-tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.reactor-content {
    position: relative;
}

.reactor-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.reactor-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.reactor-info {
    margin-bottom: 32px;
}

.reactor-info h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.reactor-info > p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1rem;
}

.reactor-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.reactor-features li {
    padding-left: 20px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.reactor-features li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.reactor-diagram {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    overflow-x: auto;
}

.reactor-diagram svg {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    display: block;
}

/* ---- API Section ---- */
.api-section {
    margin-top: 48px;
}

.api-section h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-align: center;
}

/* ---- Pooling Section ---- */
.pooling-section {
    padding: 100px 0;
}

.pool-flow {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    margin-bottom: 64px;
    text-align: center;
}

.pool-flow h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 32px;
}

.pool-animation {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.pool-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    min-width: 100px;
    transition: all var(--transition-base);
}

.pool-node svg {
    color: var(--text-secondary);
}

.pool-node span {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.pool-node.active {
    border-color: var(--accent);
    box-shadow: var(--shadow-glow);
}

.pool-node.active svg {
    color: var(--accent);
}

.pool-node.active span {
    color: var(--accent);
}

.pool-arrow {
    position: relative;
    width: 40px;
    height: 2px;
    background: var(--border);
}

.pool-arrow::after {
    content: '';
    position: absolute;
    right: 0;
    top: -4px;
    width: 10px;
    height: 10px;
    border-right: 2px solid var(--border);
    border-top: 2px solid var(--border);
    transform: rotate(45deg);
}

.pool-arrow.active {
    background: var(--accent);
}

.pool-arrow.active::after {
    border-color: var(--accent);
}

.pool-arrow .arrow-label {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: var(--text-muted);
    white-space: nowrap;
    font-family: var(--font-mono);
}

.pool-arrow.pool-return {
    order: -1;
}

.pool-controls {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* Pool Config */
.pool-config {
    margin-bottom: 64px;
}

.pool-config h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 24px;
    text-align: center;
}

.pool-config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.pool-config-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
}

.pool-config-card h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.pool-config-card > p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

/* State Sync */
.state-sync {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.state-sync h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.state-sync > p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* ---- State Machine Section ---- */
.state-machine-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.state-machine-visual {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 48px;
    overflow-x: auto;
}

.sm-svg {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    display: block;
}

.sm-state {
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.sm-state:hover {
    transform: scale(1.05);
}

.sm-transitions path {
    fill: none;
}

/* State Domains */
.state-domains {
    text-align: center;
}

.state-domains h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.domains-grid {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.domain-tag {
    padding: 8px 18px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-mono);
    background: rgba(99,102,241,0.1);
    border: 1px solid rgba(99,102,241,0.2);
    color: var(--accent);
}

/* ---- Modes Section ---- */
.modes-section {
    padding: 100px 0;
}

.modes-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin-bottom: 64px;
}

.mode-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    position: relative;
    transition: all var(--transition-base);
}

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

.mode-card.active-mode {
    border-color: var(--accent);
    box-shadow: var(--shadow-glow);
}

.mode-badge {
    position: absolute;
    top: -10px;
    right: 20px;
    background: var(--accent);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 12px;
    border-radius: 100px;
}

.mode-header {
    margin-bottom: 16px;
}

.mode-tier {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.mode-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-top: 4px;
}

.mode-body p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.mode-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.mode-features li {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.mode-features li.active {
    color: var(--success);
}

.mode-features li.inactive {
    color: var(--text-muted);
    opacity: 0.5;
}

/* Mode Selector */
.mode-selector {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.mode-selector h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-align: center;
}

.mode-selector-controls {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 24px;
}

.mode-select-btn {
    padding: 8px 24px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-mono);
}

.mode-select-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.mode-select-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.mode-detail h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.mode-detail > p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 20px;
    line-height: 1.7;
}

.mode-detail-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.detail-feature {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
}

.detail-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.detail-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

/* ---- Config Section ---- */
.config-section {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.config-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.config-tab {
    padding: 8px 20px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
}

.config-tab:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.config-tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.config-content {
    position: relative;
}

.config-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.config-panel.active {
    display: block;
}

/* ---- Code Blocks ---- */
.code-block {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.code-block.small {
    margin-top: 12px;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.code-copy {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 4px 10px;
    font-size: 0.75rem;
    color: var(--text-muted);
    cursor: pointer;
    font-family: var(--font-sans);
    transition: all var(--transition-fast);
}

.code-copy:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.code-block pre {
    padding: 20px;
    overflow-x: auto;
    font-size: 0.85rem;
    line-height: 1.7;
}

.code-block pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: inherit;
}

/* ---- Security Section ---- */
.security-section {
    padding: 100px 0;
}

.security-layers {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 64px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.security-layer {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    transition: all var(--transition-base);
}

.security-layer:hover {
    border-color: var(--accent);
    transform: translateX(4px);
}

.layer-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--accent);
    opacity: 0.3;
    font-family: var(--font-mono);
    min-width: 40px;
    text-align: center;
}

.layer-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.layer-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Security Checklist */
.security-checklist {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.security-checklist h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 24px;
    text-align: center;
}

.checklist-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 12px;
}

.checklist-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.checklist-item.checked {
    border-color: rgba(34,197,94,0.3);
}

.checklist-item svg {
    flex-shrink: 0;
}

/* ---- Getting Started Section ---- */
.getting-started {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.gs-steps {
    display: flex;
    flex-direction: column;
    gap: 40px;
    margin-bottom: 64px;
}

.gs-step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.gs-step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    font-family: var(--font-mono);
}

.gs-step-content {
    flex: 1;
}

.gs-step-content h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 16px;
}

/* Docker Section */
.gs-docker {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.gs-docker h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
}

/* ---- Footer ---- */
.footer {
    padding: 64px 0 32px;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 12px 0 20px;
    line-height: 1.6;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.1rem;
}

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

.footer-links {
    display: flex;
    gap: 16px;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.85rem;
    transition: color var(--transition-fast);
}

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

.footer-col h4 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border);
    text-align: center;
}

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

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

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

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--bg-primary);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 24px;
        z-index: 999;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

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

    .nav-toggle.open span:nth-child(2) {
        opacity: 0;
    }

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

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

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

    .modes-comparison {
        grid-template-columns: 1fr;
    }

    .hero-stats {
        gap: 24px;
    }

    .gs-step {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .pool-animation {
        flex-direction: column;
    }

    .pool-arrow {
        width: 2px;
        height: 30px;
    }

    .pool-arrow::after {
        right: -4px;
        top: auto;
        bottom: 0;
        transform: rotate(135deg);
    }

    .pool-arrow.pool-return {
        order: 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: calc(var(--nav-height) + 20px) 16px 60px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .reactor-tabs {
        flex-direction: column;
    }

    .config-tabs {
        flex-direction: column;
    }

    .mode-selector-controls {
        flex-wrap: wrap;
    }
}

/* ---- Animations ---- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}
/* ================================================================
   SCROLL-TRIGGERED ANIMATIONS
================================================================ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Hero element entrance animations */
.hero-badge    { animation: fadeInUp .6s ease both; animation-delay: .1s; }
.hero-title    { animation: fadeInUp .6s ease both; animation-delay: .2s; }
.hero-subtitle { animation: fadeInUp .6s ease both; animation-delay: .3s; }
.hero-actions  { animation: fadeInUp .6s ease both; animation-delay: .4s; }
.hero-stats    { animation: fadeInUp .6s ease both; animation-delay: .5s; }

/* Scroll-triggered: elements with class .aos start hidden and animate in
   when .visible is added by IntersectionObserver in main.js */
.aos {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .55s ease, transform .55s ease;
}
.aos.visible {
    opacity: 1;
    transform: none;
}

/* Stagger sibling .aos cards slightly */
.features-grid   .feature-card.aos:nth-child(2) { transition-delay: .08s; }
.features-grid   .feature-card.aos:nth-child(3) { transition-delay: .16s; }
.features-grid   .feature-card.aos:nth-child(4) { transition-delay: .08s; }
.features-grid   .feature-card.aos:nth-child(5) { transition-delay: .16s; }
.features-grid   .feature-card.aos:nth-child(6) { transition-delay: .24s; }
.gs-steps        .gs-step.aos:nth-child(2)       { transition-delay: .12s; }
.gs-steps        .gs-step.aos:nth-child(3)       { transition-delay: .24s; }
.lp-modes-grid   .lp-mode-card.aos:nth-child(2)  { transition-delay: .08s; }
.lp-modes-grid   .lp-mode-card.aos:nth-child(3)  { transition-delay: .16s; }
.lp-modes-grid   .lp-mode-card.aos:nth-child(4)  { transition-delay: .24s; }

/* ================================================================
   LANDING PAGE — GENERIC SECTION
================================================================ */
.lp-section {
    padding: 80px 0;
}
.lp-section-alt {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

/* ================================================================
   LANDING PAGE — BEFORE / AFTER FLOW DIAGRAM
================================================================ */
.flow-diagram {
    display: grid;
    grid-template-columns: 1fr 60px 1fr;
    gap: 32px;
    align-items: start;
    margin-top: 48px;
}
.flow-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}
.flow-col-title {
    font-size: .78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    padding: 4px 14px;
    border-radius: 99px;
}
.flow-col-title.bad  { color: #ef4444; background: rgba(239,68,68,.12); }
.flow-col-title.good { color: #22c55e; background: rgba(34,197,94,.12); }

.flow-apps {
    display: flex;
    flex-direction: column;
    gap: 3px;
    align-items: stretch;
    width: 100%;
    max-width: 220px;
}
.flow-app-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 5px 12px;
    font-size: .78rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    text-align: center;
}
.flow-app-more {
    font-size: .72rem;
    color: var(--text-muted);
    text-align: center;
    padding: 2px;
}
.flow-conns {
    font-size: .8rem;
    color: var(--text-muted);
    text-align: center;
}
.flow-conns.bad-conns  { color: #ef4444; }
.flow-conns.good-conns { color: #22c55e; }

.flow-db {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 14px 20px;
    border-radius: 12px;
    width: 100%;
    max-width: 220px;
    text-align: center;
}
.flow-db-emoji { font-size: 1.3rem; }
.flow-db strong { font-size: .9rem; }
.flow-db-status { font-size: .75rem; }
.flow-db-bad  { background: rgba(239,68,68,.08); border: 1px solid rgba(239,68,68,.25); color: #ef4444; }
.flow-db-good { background: rgba(34,197,94,.08); border: 1px solid rgba(34,197,94,.25); color: #22c55e; }

.flow-keel-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    background: rgba(99,102,241,.1);
    border: 1px solid rgba(99,102,241,.35);
    border-radius: 12px;
    padding: 10px 20px;
    width: 100%;
    max-width: 220px;
}
.flow-keel-name {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 700;
    color: var(--accent);
    font-size: .95rem;
}
.flow-keel-desc {
    font-size: .72rem;
    color: var(--accent-light);
}

.flow-vs {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .85rem;
    font-weight: 700;
    color: var(--text-muted);
    padding-top: 140px;
}

.flow-caption {
    text-align: center;
    margin-top: 36px;
    font-size: .9rem;
    color: var(--text-secondary);
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.75;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px 24px;
}

/* ================================================================
   LANDING PAGE — MODES GRID
================================================================ */
.lp-modes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}
.lp-mode-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 24px;
    transition: border-color .2s, transform .2s;
}
.lp-mode-card:hover {
    border-color: var(--border-light);
    transform: translateY(-3px);
}
.lp-mode-featured {
    border-color: var(--accent);
    background: rgba(99,102,241,.05);
}
.lp-mode-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}
.lp-mode-name {
    font-family: var(--font-mono);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
}
.lp-mode-badge {
    font-size: .7rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 99px;
    background: rgba(99,102,241,.15);
    color: var(--accent);
    border: 1px solid rgba(99,102,241,.3);
}

/* ================================================================
   LANDING PAGE — MISC HELPERS
================================================================ */
.gs-more-links {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 48px;
}
.link-accent { color: var(--accent); text-decoration: underline; }

.footer-gh-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: .85rem;
    margin-top: 16px;
    text-decoration: none;
    transition: color .15s;
}
.footer-gh-link:hover { color: var(--text-primary); }

/* ================================================================
   LANDING PAGE — RESPONSIVE
================================================================ */
@media (max-width: 768px) {
    .flow-diagram {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .flow-vs { padding-top: 0; }
    .lp-modes-grid { grid-template-columns: 1fr 1fr; }
    .gs-more-links { flex-direction: column; align-items: center; }
}
@media (max-width: 480px) {
    .lp-modes-grid { grid-template-columns: 1fr; }
}