:root {
    --primary: #0070f3;
    --primary-glow: rgba(0, 112, 243, 0.3);
    --bg: #050505;
    --surface: #111111;
    --text: #ffffff;
    --text-muted: #888888;
    --accent: #ff9d00;
    --success: #00ff88;
    --error: #ff4d4d;
    --glass: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% -20%, #002d5a 0%, transparent 50%);
    z-index: -1;
    opacity: 0.6;
}

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

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    height: 80px;
    display: flex;
    align-items: center;
    backdrop-filter: blur(10px);
    background: rgba(0, 0, 0, 0.5);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

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

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.3s;
}

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

.nav-github {
    background: var(--glass);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
}

/* Hero Section */
.hero {
    padding: 160px 0 80px;
    text-align: center;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 2rem;
}

h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -2px;
}

.gradient-text {
    background: linear-gradient(to right, var(--primary), #00d2ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 3rem;
}

.cta-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 4rem;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 0 20px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--primary-glow);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

/* App Preview (SIP Board Mockup) */
.hero-preview {
    margin-top: 4rem;
    perspective: 1000px;
}

.preview-window {
    background: #000;
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 40px 100px rgba(0,0,0,0.8);
    transform: rotateX(5deg);
    transition: transform 0.5s;
}

.preview-window:hover {
    transform: rotateX(0deg);
}

.window-header {
    background: #111;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
}

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

.dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
}

.window-title {
    margin-left: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.window-content {
    padding: 2rem;
    background: #000b1a;
    font-family: 'JetBrains Mono', monospace;
}

.sip-row {
    display: grid;
    grid-template-columns: 80px 120px 1fr 80px 120px;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(0, 112, 243, 0.1);
    align-items: center;
    text-align: left;
}

.sip-row.header {
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    padding-top: 0;
}

.time { color: var(--accent); font-weight: bold; }
.train { color: #fff; }
.route { color: #fff; }
.platform { color: var(--accent); text-align: center; }
.status.on-time { color: var(--success); }
.status.delayed { color: var(--error); }

/* Features */
.features {
    padding: 100px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--surface);
    padding: 2.5rem;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-10px);
}

.feature-header {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.feature-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 112, 243, 0.1);
    color: var(--primary);
    border-radius: 10px;
    border: 1px solid rgba(0, 112, 243, 0.2);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Toast Notification */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background: rgba(20, 20, 20, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    transform: translateX(120%);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.toast.show {
    transform: translateX(0);
}

.toast-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    border-radius: 50%;
    font-size: 12px;
}

.btn-disabled {
    opacity: 0.5 !important;
    cursor: not-allowed !important;
    pointer-events: none;
    transform: none !important;
    box-shadow: none !important;
}

/* Footer */
footer {
    padding: 4rem 0;
    border-top: 1px solid var(--glass-border);
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .sip-row { font-size: 0.7rem; grid-template-columns: 50px 80px 1fr 40px 80px; }
    .cta-group { flex-direction: column; }
}