:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --dark-bg: #0a0a0f;
    --card-bg: rgba(255, 255, 255, 0.03);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    position: relative;
    overflow-x: hidden;
}

/* Animated gradient background */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(240, 147, 251, 0.1) 0%, transparent 50%);
    animation: gradientShift 20s ease infinite;
    z-index: -1;
}

@keyframes gradientShift {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(5%, -5%) rotate(120deg); }
    66% { transform: translate(-5%, 5%) rotate(240deg); }
}

/* Grain texture overlay */
.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 1;
    opacity: 0.5;
}

.container {
    max-width: 600px;
    width: 100%;
    text-align: center;
    position: relative;
    z-index: 2;
}

.content {
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* App Icon */
.app-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto 2rem;
    animation: float 3s ease-in-out infinite;
    filter: drop-shadow(var(--shadow-glow));
    transition: transform 0.3s ease;
}

.app-icon:hover {
    transform: scale(1.05);
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.app-icon svg {
    width: 100%;
    height: 100%;
    border-radius: 22px;
}

/* Typography */
.app-name {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.tagline {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.description {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-tertiary);
    max-width: 500px;
    margin: 0 auto 3rem;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

/* Features */
.features {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    min-width: 140px;
}

.feature-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 2rem;
    filter: grayscale(0.2);
}

.feature-item span {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Download Section */
.download-section {
    margin-bottom: 4rem;
    animation: fadeInUp 0.8s ease-out 0.5s both;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: white;
    background: var(--primary-gradient);
    border: none;
    border-radius: 50px;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.download-btn:hover::before {
    opacity: 1;
}

.download-btn:active {
    transform: translateY(0);
}

.download-icon {
    width: 24px;
    height: 24px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

.download-info {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* Screenshots */
.screenshots {
    display: flex;
    justify-content: center;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.screenshot-card {
    perspective: 1000px;
}

.phone-frame {
    width: 280px;
    background: linear-gradient(145deg, #1a1a2e, #16161f);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.5),
        inset 0 0 0 1px rgba(255, 255, 255, 0.1);
    position: relative;
    transition: transform 0.3s ease;
}

.screenshot-card:hover .phone-frame {
    transform: translateY(-5px) rotateY(5deg) rotateX(2deg);
}

.phone-frame::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    z-index: 10;
}

.app-screenshot {
    width: 100%;
    height: auto;
    border-radius: 32px;
    display: block;
    object-fit: cover;
    background: linear-gradient(180deg, #0f0f1a 0%, #1a1a2e 100%);
    min-height: 560px;
}

/* Footer */
.footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    animation: fadeInUp 0.8s ease-out 0.7s both;
}

.footer p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: 1rem;
}

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

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

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

.footer-links a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-name {
        font-size: 2.5rem;
    }

    .tagline {
        font-size: 1.125rem;
    }

    .features {
        gap: 1rem;
    }

    .feature-item {
        min-width: 120px;
        padding: 1rem 0.75rem;
    }

    .phone-frame {
        width: 240px;
    }

    .download-btn {
        padding: 0.875rem 2rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 1rem 0.75rem;
    }

    .app-icon {
        width: 100px;
        height: 100px;
    }

    .app-name {
        font-size: 2rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .description {
        font-size: 0.9375rem;
    }

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

    .feature-item {
        width: 100%;
        max-width: 280px;
    }

    .phone-frame {
        width: 200px;
    }
}