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

:root {
    --primary: #6366F1;
    --primary-dark: #4F46E5;
    --accent: #22C55E;
    --background: #0F172A;
    --surface: #1E293B;
    --text: #F8FAFC;
    --text-muted: #94A3B8;
    --border: #334155;
}

body {
    font-family: 'Lexend', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.5rem;
}


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

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4rem;
    padding: 8rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-content {
    flex: 1;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    max-width: 500px;
}

.app-badges {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Store Badges */
.store-badge {
    display: inline-block;
    transition: transform 0.2s;
}

.store-badge:hover {
    transform: scale(1.02);
}

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

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

/* Phone Mockup */
.phone-mockup {
    width: 280px;
    height: 560px;
    background: linear-gradient(145deg, #2a2a2a, #1a1a1a);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--background);
    border-radius: 32px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-preview {
    text-align: center;
    padding: 2rem;
}

.preview-header {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 2px;
    margin-bottom: 1rem;
}

.preview-timer {
    font-size: 4rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.preview-pace {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.preview-progress {
    height: 8px;
    background: var(--surface);
    border-radius: 4px;
    margin-bottom: 1rem;
    position: relative;
    overflow: hidden;
}

.preview-progress::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 65%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 4px;
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0%, 100% { width: 60%; }
    50% { width: 70%; }
}

.preview-set {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Features */
.features {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.features h2, .how-it-works h2, .example h2, .cta h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

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

.feature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.feature-card.premium {
    border-color: var(--primary);
    background: linear-gradient(145deg, var(--surface), rgba(99, 102, 241, 0.1));
}


.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

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

.premium-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
}

/* How It Works */
.how-it-works {
    padding: 6rem 2rem;
    background: var(--surface);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.step {
    text-align: center;
    padding: 2rem;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
}

.step h3 {
    margin-bottom: 0.75rem;
}

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

/* Example */
.example {
    padding: 6rem 2rem;
    max-width: 600px;
    margin: 0 auto;
}

.example-desc {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.checkpoint-table {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.checkpoint-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.checkpoint-row:last-child {
    border-bottom: none;
}

.checkpoint-row.header {
    background: rgba(99, 102, 241, 0.1);
    font-weight: 600;
    color: var(--primary);
}

.checkpoint-row span {
    text-align: center;
}

/* CTA */
.cta {
    padding: 6rem 2rem;
    text-align: center;
    background: linear-gradient(180deg, var(--background), var(--surface));
}

.cta p {
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.cta .app-badges {
    justify-content: center;
}

/* Footer */
footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 3rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

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

.copyright {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 6rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .tagline {
        margin: 0 auto 2rem;
    }

    .app-badges {
        justify-content: center;
    }

    .nav-links {
        display: none;
    }

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

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