/* ============================================================
   MODERN APP SHOWCASE DESIGN SYSTEM
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    --bg-main: #0a0a0c;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --accent: #ef4444; /* Default accent (Tomato) */
    --accent-gradient: linear-gradient(135deg, #ef4444 0%, #f97316 100%);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    --radius-lg: 24px;
    --radius-md: 16px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* --- Layout ----------------------------------------------- */
.app-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 24px 100px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 40px;
    transition: color 0.2s;
}

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

/* --- Hero Section ----------------------------------------- */
.app-hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-bottom: 80px;
    animation: fadeInDown 0.8s ease-out;
}

.app-icon {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 12px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
    object-fit: contain;
}

.app-title {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 16px;
    background: linear-gradient(to bottom, #fff 0%, #a1a1aa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.app-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 32px;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: var(--accent-gradient);
    color: #fff;
    padding: 16px 32px;
    border-radius: var(--radius-md);
    font-weight: 700;
    text-decoration: none;
    box-shadow: 0 20px 40px rgba(239, 68, 68, 0.2);
    transition: transform 0.2s, box-shadow 0.2s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 50px rgba(239, 68, 68, 0.3);
}

/* --- Features Grid ---------------------------------------- */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 40px;
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 80px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px;
    transition: background 0.2s, transform 0.2s;
}

.feature-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 16px;
    display: block;
}

.feature-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* --- App Flow / Steps ------------------------------------ */
.steps-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    margin-bottom: 80px;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
}

.step-item h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 16px;
}

.step-item p {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* --- App Store Badges (Optional alternative) -------------- */
.store-badges {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-top: 40px;
}

/* --- Footer ----------------------------------------------- */
.app-footer {
    text-align: center;
    padding: 60px 0;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 20px;
}

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

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

/* --- Animations ------------------------------------------ */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Mobile Tweaks ---------------------------------------- */
@media (max-width: 640px) {
    .app-container {
        padding: 32px 16px 80px;
    }
    .app-hero {
        margin-bottom: 60px;
    }
    .steps-container {
        padding: 40px 24px;
    }
}