/* ========================================
   Lingxi Public Hub v0.1 - Dark Tech Style
   ======================================== */

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a24;
    --bg-card-hover: #22222e;
    --accent-cyan: #00d4ff;
    --accent-purple: #7c3aed;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-pink: #ec4899;
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --border-color: #27272a;
    --glow-cyan: 0 0 20px rgba(0, 212, 255, 0.3);
    --glow-purple: 0 0 20px rgba(124, 58, 237, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    position: relative;
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

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

.grid-lines {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

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

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem;
}

.hero h1 {
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 800;
    letter-spacing: 0.1em;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.glitch {
    position: relative;
}

.glitch::before,
.glitch::after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glitch::before {
    animation: glitch-1 2s infinite linear alternate-reverse;
    clip-path: polygon(0 0, 100% 0, 100% 35%, 0 35%);
}

.glitch::after {
    animation: glitch-2 3s infinite linear alternate-reverse;
    clip-path: polygon(0 65%, 100% 65%, 100% 100%, 0 100%);
}

@keyframes glitch-1 {
    0%, 100% { transform: translate(0); }
    20% { transform: translate(-2px, 2px); }
    40% { transform: translate(2px, -2px); }
    60% { transform: translate(-1px, 1px); }
    80% { transform: translate(1px, -1px); }
}

@keyframes glitch-2 {
    0%, 100% { transform: translate(0); }
    20% { transform: translate(2px, -2px); }
    40% { transform: translate(-2px, 2px); }
    60% { transform: translate(1px, -1px); }
    80% { transform: translate(-1px, 1px); }
}

.subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* ========================================
   Navigation Cards
   ======================================== */

.main-nav {
    padding: 3rem 1rem;
    max-width: 1400px;
    margin: 0 auto;
}

.nav-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 0 1rem;
}

.nav-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.nav-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

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

.nav-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    filter: grayscale(0.2);
    transition: filter 0.3s ease;
}

.nav-card:hover .nav-icon {
    filter: grayscale(0);
}

.nav-card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-align: center;
}

.nav-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
}

/* ========================================
   Section Pages
   ======================================== */

.page-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.page-header {
    text-align: center;
    padding: 3rem 1rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.section {
    margin-bottom: 3rem;
}

.section-title {
    font-size: 1.5rem;
    color: var(--accent-cyan);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: all 0.3s ease;
}

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

.card h3 {
    color: var(--accent-cyan);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.card p, .card li {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.card ul {
    list-style: none;
    padding-left: 0;
}

.card li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.card li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-purple);
}

/* Status Badge */
.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-active {
    background: rgba(16, 185, 129, 0.2);
    color: var(--accent-green);
    border: 1px solid var(--accent-green);
}

.status-progress {
    background: rgba(245, 158, 11, 0.2);
    color: var(--accent-orange);
    border: 1px solid var(--accent-orange);
}

.status-planned {
    background: rgba(124, 58, 237, 0.2);
    color: var(--accent-purple);
    border: 1px solid var(--accent-purple);
}

/* ========================================
   Footer
   ======================================== */

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

/* ========================================
   Back Link
   ======================================== */

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-cyan);
    text-decoration: none;
    padding: 1rem;
    transition: color 0.3s ease;
}

.back-link:hover {
    color: var(--accent-purple);
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 768px) {
    .hero {
        min-height: 50vh;
    }
    
    .nav-container {
        grid-template-columns: 1fr;
    }
    
    .nav-card {
        padding: 1.5rem 1rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        letter-spacing: 0.05em;
    }
    
    .subtitle {
        letter-spacing: 0.1em;
        font-size: 1.2rem;
    }
}

/* ========================================
   Animations
   ======================================== */

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

.nav-card {
    animation: fadeIn 0.5s ease forwards;
}

.nav-card:nth-child(1) { animation-delay: 0.1s; }
.nav-card:nth-child(2) { animation-delay: 0.2s; }
.nav-card:nth-child(3) { animation-delay: 0.3s; }
.nav-card:nth-child(4) { animation-delay: 0.4s; }
.nav-card:nth-child(5) { animation-delay: 0.5s; }