:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a25;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --gradient-start: #6366f1;
    --gradient-end: #a855f7;
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo {
    font-size: 28px;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
    background: transparent;
}

.brand-name {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 32px;
}

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

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-top: 100px;
}

.hero-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 60px 24px;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    padding: 16px 32px;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(99, 102, 241, 0.3);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
}

/* Hero Visual */
.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 1000px;
    padding: 60px 0;
}

.app-screenshot {
    max-width: 240px;
    width: 100%;
    height: auto;
    border-radius: 32px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    position: absolute;
}

/* Screenshot Gallery - 3D Cylinder */
.screenshot-gallery {
    position: relative;
    width: 300px;
    height: 550px;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.screenshot-left {
    transform: rotateY(-40deg) translateZ(200px) translateX(-120px);
    opacity: 0.6;
    filter: brightness(0.7);
}

.screenshot-center {
    transform: rotateY(0deg) translateZ(280px);
    opacity: 1;
    z-index: 10;
    filter: brightness(1);
}

.screenshot-right {
    transform: rotateY(40deg) translateZ(200px) translateX(120px);
    opacity: 0.6;
    filter: brightness(0.7);
}

.screenshot-hidden {
    transform: rotateY(180deg) translateZ(100px);
    opacity: 0;
    pointer-events: none;
}

.screenshot-left:hover,
.screenshot-right:hover {
    opacity: 0.9;
    filter: brightness(0.9);
    cursor: pointer;
}



/* App Preview Section */
.app-preview {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.app-preview h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.preview-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 60px;
    font-size: 1.1rem;
}

.preview-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

.preview-card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 24px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.preview-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.2);
}

.preview-image {
    width: 100%;
    max-width: 200px;
    height: auto;
    border-radius: 20px;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.preview-card h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

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

.app-mockup {
    width: 280px;
    height: 540px;
    background: linear-gradient(145deg, #2a2a3a, #1a1a25);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 40px 80px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.1);
}

.mockup-screen {
    height: 100%;
    background: var(--bg-primary);
    border-radius: 32px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.mockup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    height: auto;
    border-radius: 0;
}

.mockup-title {
    font-size: 18px;
    font-weight: 700;
    color: white;
}

.mockup-icons {
    display: flex;
    gap: 12px;
    font-size: 16px;
}

.mockup-list {
    flex: 1;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow: hidden;
}

.mockup-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-card);
    border-radius: 12px;
    height: auto;
}

.item-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    color: white;
}

.item-icon.google {
    background: #4285f4;
}

.item-icon.facebook {
    background: #1877f2;
}

.item-icon.github {
    background: #333;
}

.item-icon.amazon {
    background: #ff9900;
    color: #111;
}

.item-content {
    flex: 1;
}

.item-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.item-email {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.item-copy {
    font-size: 16px;
    opacity: 0.6;
}

.mockup-nav {
    display: flex;
    justify-content: space-around;
    padding: 12px;
    background: var(--bg-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-item {
    font-size: 20px;
    opacity: 0.4;
}

.nav-item.active {
    opacity: 1;
}

/* Language Switch Button */
.lang-switch {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s;
}

.lang-switch:hover {
    background: var(--accent);
    border-color: var(--accent);
}

/* Features Section */
.features {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    padding: 32px;
    border-radius: 20px;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
}

/* Security Section */
.security {
    padding: 120px 0;
}

.security h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
}

.security-content {
    display: flex;
    gap: 60px;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.security-text {
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.security-item h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.security-item p {
    color: var(--text-secondary);
}

.security-visual {
    flex: 0 0 200px;
    display: flex;
    justify-content: center;
}

.shield {
    font-size: 150px;
    filter: drop-shadow(0 20px 40px rgba(99, 102, 241, 0.3));
}

/* Download Section */
.download {
    padding: 120px 0;
    background: var(--bg-secondary);
    text-align: center;
}

.download h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.download-subtitle {
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.download-buttons {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 28px;
    background: var(--bg-card);
    border-radius: 16px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.download-btn:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
}

.store-icon {
    font-size: 32px;
}

.store-text {
    text-align: left;
}

.store-text small {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
}

.store-text strong {
    font-size: 16px;
}

/* Footer */
.footer {
    padding: 60px 0 24px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-wrap: wrap;
    gap: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    padding-top: 24px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        padding: 16px 20px;
    }

    .nav-links {
        display: none;
    }

    .hero-content {
        padding: 40px 20px;
    }

    /* Mobile: Simplified carousel */
    .hero-visual {
        perspective: none;
        padding: 20px 0;
        overflow: hidden;
    }

    .screenshot-gallery {
        width: 100%;
        height: 400px;
        display: flex;
        justify-content: center;
        align-items: center;
        transform-style: flat;
    }

    .app-screenshot {
        position: absolute;
        max-width: 200px;
    }

    .screenshot-left {
        transform: translateX(-60%) scale(0.7);
        opacity: 0.4;
        filter: brightness(0.5);
    }

    .screenshot-center {
        transform: translateX(0) scale(1);
        opacity: 1;
        z-index: 10;
        filter: brightness(1);
    }

    .screenshot-right {
        transform: translateX(60%) scale(0.7);
        opacity: 0.4;
        filter: brightness(0.5);
    }

    .screenshot-hidden {
        transform: translateX(0) scale(0.5);
        opacity: 0;
    }

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

    .security-content {
        flex-direction: column-reverse;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .preview-cards {
        grid-template-columns: 1fr;
    }
}