/* Modern Dark Theme Design System */
:root {
    /* Colors */
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --primary: #10b981; /* TeamSync Brand Color - Green */
    --primary-hover: #34d399;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: rgba(148, 163, 184, 0.1);
    
    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #064e3b 0%, #0f172a 100%); /* Deep Green to Dark Slate */
    --gradient-accent: linear-gradient(135deg, #10b981 0%, #059669 100%);
    
    /* Spacing */
    --container-padding: 2rem;
    --max-width: 1200px;
}

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

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

/* Typography */
h1, h2, h3 {
    line-height: 1.2;
    font-weight: 700;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #fff, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    text-align: center;
    margin-bottom: 3rem;
}

p {
    color: var(--text-muted);
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
}

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

.grid {
    display: grid;
    gap: 2rem;
}

/* Header */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

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

.nav-links a:hover {
    color: #fff;
}

.cta-button {
    background: var(--gradient-accent);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
    color: white;
}

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

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(60px);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text {
    z-index: 10;
}

.hero-image {
    position: relative;
    z-index: 10;
}

.store-buttons {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.store-badge {
    transition: transform 0.2s ease, opacity 0.2s ease;
    opacity: 0.9;
}

.store-badge:hover {
    transform: translateY(-3px);
    opacity: 1;
}

.store-badge img {
    height: 50px;
    width: auto;
}

.hero-image img {
    width: 100%;
    max-width: 500px;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0,0,0,0.5));
    border-radius: 20px;
    /* Placeholder style until image is generated */
    background: linear-gradient(45deg, #1e293b, #334155);
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

/* Features Section */
.features {
    padding: 8rem 0;
    background: var(--bg-dark);
}

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

.feature-card {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(16, 185, 129, 0.3);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

/* Social Proof */
.social-proof {
    padding: 6rem 0;
    text-align: center;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: rgba(15, 23, 42, 0.5);
}

.stats-grid {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-top: 3rem;
    flex-wrap: wrap;
}

.stat-item h4 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

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

.footer-links {
    margin-bottom: 2rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin: 0 1rem;
    font-size: 0.9rem;
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }

    .hero-image {
        order: -1;
    }
    
    .nav-links {
        display: none; /* simple mobile hide for MVP */
    }
    
    h1 {
        font-size: 2.5rem;
    }
}