/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    background: #000;
    color: #fff;
    font-family: system-ui, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}
a {
    color: inherit;
    text-decoration: none;
}

/* Gradient Background */
.gradient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 200vw;
    height: 200vh;
    background: conic-gradient(from 0deg, red, yellow, lime, red);
    animation: rotate 20s linear infinite;
    filter: blur(150px);
    opacity: 0.15;
    z-index: -1;
}
@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Hero */
.apple-style {
    padding: 6rem 1.5rem 4rem;
    text-align: center;
}
.hero-icon {
    width: 72px;
    height: 72px;
    margin-bottom: 0.75rem;
}
.hero-subtitle {
    font-size: 0.95rem;
    opacity: 0.75;
    margin-bottom: 1rem;
    font-weight: 500;
}
.hero-headline {
    font-size: 2.8rem;
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 1.25rem;
}
.hero-description {
    font-size: 1rem;
    max-width: 640px;
    margin: 0 auto 2rem;
    opacity: 0.85;
    line-height: 1.7;
}
.hero-cta {
    background: #fff;
    color: #000;
    padding: 0.85rem 2rem;
    border-radius: 32px;
    font-weight: 600;
    font-size: 1rem;
    transition: background 0.3s ease;
}
.hero-cta:hover {
    background: #ddd;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 500;
    text-align: center;
    margin: 5rem 0 2.5rem;
    opacity: 0.95;
    letter-spacing: 0.3px;
    color: #fff;
    position: relative;
}
.section-title::after {
    content: "";
    display: block;
    width: 64px;
    height: 2px;
    background: rgba(255, 255, 255, 0.08);
    margin: 1rem auto 0;
    border-radius: 1px;
}

/* Card Stack */
.card-stack {
    padding: 4rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Card Layout */
.card {
    display: flex;
    flex-direction: column;
    background: #000;
    border-radius: 1.5rem;
    padding: 2rem;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.6);
    gap: 2rem;
}
.card-text {
    flex: 1;
}
.card-text h3 {
    font-size: 1.6rem;
    margin-bottom: 0.5rem;
    text-align: center;
}
.card-text .subtitle {
    font-size: 0.9rem;
    opacity: 0.7;
    text-align: center;
    margin-bottom: 1rem;
}
.card-text p {
    font-size: 1rem;
    opacity: 0.85;
    line-height: 1.6;
    text-align: left;
}
.card-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}
.card-image img {
    width: 100%;
    max-width: 300px;
    border-radius: 1rem;
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.08);
}

/* Accent Borders */
.card-accent-green { border: 1px solid #00ff88; }
.card-accent-yellow { border: 1px solid #ffcc00; }
.card-accent-red { border: 1px solid #ff4444; }

@media (min-width: 768px) {
    .card {
        flex-direction: row;
        align-items: center;
    }
    .card-text h3, .card-text .subtitle {
        text-align: left;
    }
}

/* Notification Section */
.notification-section {
    padding: 4rem 2rem;
}
.notification-card {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
    background-color: #000;
    padding: 2rem;
    border-radius: 1.5rem;
}
.notification-text h2 {
    font-size: 2rem;
}
.notification-image img {
    width: 100%;
    border-radius: 1rem;
}
@media (min-width: 768px) {
    .notification-card {
        flex-direction: row;
        align-items: center;
    }
}

/* App Store Promo */
.app-promo {
    text-align: center;
    padding: 4rem 2rem;
    background: transparent;
    border-top: none;
    border-bottom: none;
    box-shadow: none;
}
.promo-content {
    max-width: 700px;
    margin: 0 auto;
}
.app-store-badge {
    margin-top: 1.5rem;
    height: 56px;
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.1));
}

/* Footer */
.footer {
    text-align: center;
    padding: 3rem 1rem 4rem;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
    background: transparent;
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}
.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
}
.footer-links a:hover {
    color: #fff;
}
.footer-legal p {
    margin: 0.25rem 0;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
}

/* Responsive Enhancements */
@media (max-width: 768px) {
    .footer-links {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
        gap: 1.25rem;
    }

    .hero-headline {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .card {
        padding: 1.5rem;
    }

    .card-text h3 {
        font-size: 1.4rem;
    }

    .card-image img {
        max-width: 240px;
    }

    .notification-text h2 {
        font-size: 1.6rem;
        text-align: center;
    }
}

/* Tablet (769px–1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .hero-headline {
        font-size: 2.4rem;
    }

    .card-image img {
        max-width: 280px;
    }

    .notification-text h2 {
        font-size: 1.8rem;
    }
}

/* Large screens (≥1025px) */
@media (min-width: 1025px) {
    .hero-headline {
        font-size: 3rem;
    }

    .card-image img {
        max-width: 320px;
    }
}