/* ==========================================================================
   Botong Sihai - Tesla-Style Enterprise Website
   Main Stylesheet
   ========================================================================== */

/* CSS Variables / Design Tokens */
:root {
    --color-bg-primary: #000000;
    --color-bg-secondary: #0a0a0a;
    --color-bg-tertiary: #111111;
    --color-bg-elevated: #1a1a1a;
    --color-text-primary: #ffffff;
    --color-text-secondary: #cccccc;
    --color-text-tertiary: #888888;
    --color-text-muted: #555555;
    --color-accent: #00d4ff;
    --color-accent-alt: #7b68ff;
    --color-accent-warm: #ff6b35;
    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-light: rgba(255, 255, 255, 0.05);
    --color-overlay: rgba(0, 0, 0, 0.6);
    --color-success: #00e676;
    --color-warning: #ffc107;
    --color-error: #ff4757;

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;

    --size-xs: 0.75rem;
    --size-sm: 0.875rem;
    --size-base: 1rem;
    --size-md: 1.125rem;
    --size-lg: 1.25rem;
    --size-xl: 1.5rem;
    --size-2xl: 2rem;
    --size-3xl: 2.5rem;
    --size-4xl: 3rem;
    --size-5xl: 4rem;
    --size-6xl: 5rem;
    --size-7xl: 6rem;
    --size-8xl: 7rem;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    --spacing-4xl: 8rem;
    --spacing-5xl: 12rem;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);

    --header-height: 64px;
    --container-max-width: 1400px;
    --container-padding: 6vw;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 16px 64px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.3);

    --z-base: 1;
    --z-elevated: 10;
    --z-sticky: 50;
    --z-header: 100;
    --z-overlay: 1000;
    --z-modal: 2000;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-primary);
    font-size: var(--size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    overflow-x: hidden;
    min-height: 100vh;
}

img, svg, video {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    background: none;
    border: none;
    color: inherit;
}

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

ul, ol {
    list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin: 0;
}

h1 {
    font-size: clamp(var(--size-4xl), 8vw, var(--size-7xl));
    font-weight: 700;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(var(--size-3xl), 5vw, var(--size-5xl));
}

h3 {
    font-size: clamp(var(--size-xl), 3vw, var(--size-2xl));
}

h4 {
    font-size: var(--size-xl);
}

p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

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

.section {
    position: relative;
    padding: var(--spacing-5xl) 0;
    overflow: hidden;
}

.section-sm {
    padding: var(--spacing-3xl) 0;
}

.section-lg {
    padding: 8rem 0;
}

/* Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-header);
    padding: var(--spacing-sm) 0;
    transition: all var(--transition-base);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.site-header.scrolled {
    background: rgba(0, 0, 0, 0.85);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-xs) 0;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    height: 48px;
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--size-md);
    font-weight: 600;
    letter-spacing: 0.02em;
    z-index: var(--z-header);
}

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

.brand-text {
    font-size: var(--size-lg);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.brand-text .brand-name {
    color: var(--color-text-primary);
}

.brand-text .brand-tag {
    color: var(--color-accent);
    margin-left: 4px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    font-size: var(--size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: all var(--transition-base);
    transform: translateX(-50%);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 60%;
}

.nav-link.active {
    color: var(--color-text-primary);
}

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    width: 24px;
    height: 24px;
    justify-content: center;
    align-items: center;
}

.menu-toggle span {
    display: block;
    width: 20px;
    height: 1.5px;
    background: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-size: var(--size-sm);
    font-weight: 600;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.6s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--color-accent);
    color: #000;
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background: #00bce5;
    border-color: #00bce5;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.3);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text-primary);
    border-color: var(--color-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

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

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

.btn-lg {
    padding: 16px 36px;
    font-size: var(--size-base);
}

.btn-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    display: none;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.4) 0%, rgba(0, 0, 0, 0.7) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    animation: heroFadeIn 1.5s ease-out;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 8px 16px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: var(--radius-full);
    font-size: var(--size-sm);
    color: var(--color-accent);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(10px);
    animation: pulseGlow 3s ease-in-out infinite;
}

@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.4); }
    50% { box-shadow: 0 0 24px 4px rgba(0, 212, 255, 0.1); }
}

.hero-title {
    font-size: clamp(2rem, 5.5vw, 4rem);
    line-height: 1.05;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(180deg, #ffffff 0%, rgba(255, 255, 255, 0.85) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 4px 32px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
    font-size: clamp(var(--size-md), 2vw, var(--size-xl));
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    color: var(--color-text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--size-xs);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translate(-50%, 0); }
    50% { transform: translate(-50%, -10px); }
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-header.left {
    text-align: left;
    margin-left: 0;
}

.section-eyebrow {
    display: inline-block;
    font-size: var(--size-sm);
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: var(--spacing-sm);
    position: relative;
    padding-left: 32px;
}

.section-eyebrow::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 24px;
    height: 1px;
    background: var(--color-accent);
    transform: translateY(-50%);
}

.section-title {
    margin-bottom: var(--spacing-md);
    font-size: clamp(var(--size-3xl), 4vw, var(--size-5xl));
}

.section-subtitle {
    font-size: var(--size-lg);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Cards & Grids */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    position: relative;
    padding: var(--spacing-xl);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.05) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(0, 212, 255, 0.3);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
}

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

.feature-icon {
    width: 56px;
    height: 56px;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 212, 255, 0.08);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
    background: rgba(0, 212, 255, 0.15);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-card-title {
    font-size: var(--size-xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.feature-card-desc {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* Stats */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    padding: var(--spacing-3xl) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
}

.stat-number {
    font-size: clamp(var(--size-4xl), 6vw, var(--size-6xl));
    font-weight: 700;
    background: linear-gradient(135deg, #ffffff 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--size-sm);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

/* App Showcase */
.apps-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.app-card {
    position: relative;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
    cursor: pointer;
}

.app-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 212, 255, 0.4);
    box-shadow: 0 20px 60px rgba(0, 212, 255, 0.15);
}

.app-card-image {
    position: relative;
    aspect-ratio: 2 / 3;
    overflow: hidden;
    background: var(--color-bg-tertiary);
}

.app-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s ease;
}

.app-card:hover .app-card-image img {
    transform: scale(1.05);
}

.app-card-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(0, 0, 0, 0.8) 100%);
}

.app-card-content {
    padding: var(--spacing-md);
}

.app-card-tag {
    display: inline-block;
    font-size: var(--size-xs);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: var(--spacing-xs);
}

.app-card-title {
    font-size: var(--size-lg);
    margin-bottom: var(--spacing-xs);
}

.app-card-desc {
    font-size: var(--size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.app-card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border-light);
}

.app-card-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: var(--size-xs);
    color: var(--color-text-tertiary);
}

/* Footer */
.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-5xl);
    position: relative;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--color-border);
}

.footer-brand p {
    color: var(--color-text-tertiary);
    font-size: var(--size-sm);
    margin-top: var(--spacing-sm);
    max-width: 320px;
}

.footer-heading {
    font-size: var(--size-sm);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: var(--color-text-tertiary);
    font-size: var(--size-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copy {
    font-size: var(--size-xs);
    color: var(--color-text-muted);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-md);
}

.footer-legal a {
    font-size: var(--size-xs);
    color: var(--color-text-tertiary);
    transition: color var(--transition-fast);
}

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

/* Form */
.form-grid {
    display: grid;
    gap: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-label {
    font-size: var(--size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 14px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: inherit;
    font-size: var(--size-base);
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-accent);
    background: rgba(0, 212, 255, 0.05);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 140px;
}

.form-select {
    cursor: pointer;
}

/* Utility */
.text-gradient {
    background: linear-gradient(135deg, #ffffff 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.text-gradient-warm {
    background: linear-gradient(135deg, #ffffff 0%, var(--color-accent-warm) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.divider {
    width: 80px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    margin: var(--spacing-lg) auto;
}

.divider-left {
    margin: var(--spacing-md) 0;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-up {
    opacity: 0;
    transform: translateY(60px);
    transition: opacity 1s ease, transform 1s ease;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-60px);
    transition: opacity 1s ease, transform 1s ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(60px);
    transition: opacity 1s ease, transform 1s ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }
.delay-6 { transition-delay: 0.6s; }

/* Cursor */
.cursor-glow {
    position: fixed;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.6) 0%, transparent 70%);
    pointer-events: none;
    z-index: var(--z-overlay);
    mix-blend-mode: screen;
    transform: translate(-50%, -50%);
    transition: width 0.2s ease, height 0.2s ease;
    display: none;
}

/* Page-specific */
.page-hero {
    position: relative;
    min-height: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 120px 0 60px;
    text-align: center;
}

.page-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 0%, rgba(0, 212, 255, 0.08), transparent 60%);
    pointer-events: none;
    z-index: 0;
}

/* Tags */
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--size-xs);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

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

/* Timeline */
.timeline {
    position: relative;
    padding: var(--spacing-lg) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--color-accent), transparent);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    width: 50%;
    padding: var(--spacing-md) var(--spacing-xl);
}

.timeline-item:nth-child(odd) {
    margin-left: 0;
    text-align: right;
}

.timeline-item:nth-child(even) {
    margin-left: 50%;
}

.timeline-item::before {
    content: '';
    position: absolute;
    top: 50%;
    width: 16px;
    height: 16px;
    background: var(--color-accent);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.2);
    transform: translateY(-50%);
}

.timeline-item:nth-child(odd)::before {
    right: -8px;
}

.timeline-item:nth-child(even)::before {
    left: -8px;
}

.timeline-year {
    font-size: var(--size-sm);
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 4px;
}

.timeline-title {
    font-size: var(--size-lg);
    margin-bottom: var(--spacing-xs);
}

.timeline-desc {
    color: var(--color-text-tertiary);
    font-size: var(--size-sm);
}

/* Two Column */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

/* Marquee */
.marquee {
    overflow: hidden;
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.marquee-track {
    display: flex;
    gap: var(--spacing-2xl);
    animation: marquee 30s linear infinite;
    width: max-content;
}

.marquee-item {
    font-size: clamp(var(--size-2xl), 4vw, var(--size-4xl));
    font-weight: 700;
    color: var(--color-text-muted);
    white-space: nowrap;
    transition: color var(--transition-fast);
}

.marquee-item:hover {
    color: var(--color-text-primary);
}

@keyframes marquee {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}

/* Notice/Banner */
.notice {
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(0, 212, 255, 0.05);
    border-left: 3px solid var(--color-accent);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-lg);
    font-size: var(--size-sm);
    color: var(--color-text-secondary);
}

/* Parallax */
.parallax-section {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.parallax-bg {
    position: absolute;
    inset: -10%;
    background-attachment: scroll;
    background-size: cover;
    background-position: center;
    z-index: -1;
}

/* Glow line */
.glow-line {
    position: relative;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    margin: var(--spacing-2xl) auto;
    width: 100%;
    max-width: 600px;
}

.glow-line::before {
    content: '';
    position: absolute;
    top: -3px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 7px;
    background: var(--color-accent);
    border-radius: 50%;
    filter: blur(8px);
    opacity: 0.5;
}

/* Loading */
.page-loader {
    position: fixed;
    inset: 0;
    background: var(--color-bg-primary);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s ease;
}

.page-loader.hidden {
    opacity: 0;
    pointer-events: none;
}

.loader-circle {
    width: 48px;
    height: 48px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Back to top */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    background: rgba(0, 0, 0, 0.8);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-primary);
    z-index: var(--z-elevated);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

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

.back-to-top:hover {
    background: var(--color-accent);
    color: #000;
    transform: translateY(-2px);
}

/* Selection */
::selection {
    background: var(--color-accent);
    color: #000;
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Decorative grid background */
.grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.spotlight {
    position: absolute;
    width: 800px;
    height: 800px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.15) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
    filter: blur(40px);
}