:root {
    --primary-dark: #0F172A;
    --primary-light: #1E293B;
    --secondary-dark: #334155;
    --secondary-light: #475569;
    --accent-primary: #3B82F6;
    --accent-success: #10B981;
    --accent-warning: #F59E0B;
    --accent-danger: #EF4444;
    --accent-info: #8B5CF6;
    --gradient-primary: linear-gradient(135deg, #3B82F6, #8B5CF6);
    --gradient-success: linear-gradient(135deg, #10B981, #3B82F6);
    --gradient-warning: linear-gradient(135deg, #F59E0B, #EF4444);
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    --text-on-accent: #FFFFFF;
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-card: rgba(30, 41, 59, 0.8);
    --bg-card-glass: rgba(30, 41, 59, 0.5);
    --border-light: rgba(255, 255, 255, 0.1);
    --radius-lg: 24px;
    --radius-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(56, 189, 248, 0.15) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.15) 0%, transparent 20%);
}

/* Language Selector */
.language-selector {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    background: var(--bg-card-glass);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-md);
    padding: 8px 16px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
}

.language-selector select {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 14px;
    padding: 4px;
    cursor: pointer;
    width: 100px;
}

.language-selector select:focus {
    outline: none;
}

.language-selector option {
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-card-glass);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    padding: 1rem 2rem;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-on-accent);
    font-size: 20px;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-info));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

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

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

.nav-link.active {
    color: var(--accent-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-primary);
    border-radius: 2px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
}

/* Hero Section */
.hero {
    padding-top: 120px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(59, 130, 246, 0.1), transparent 50%),
                radial-gradient(circle at 70% 20%, rgba(139, 92, 246, 0.1), transparent 50%);
    z-index: -1;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    animation: fadeInUp 1s ease;
}

.hero-badge {
    display: inline-block;
    background: rgba(59, 130, 246, 0.2);
    color: var(--accent-primary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.hero-image {
    position: relative;
    animation: float 6s ease-in-out infinite;
}

.watch-container {
    position: relative;
    width: 400px;
    height: 400px;
    margin: 0 auto;
}

.watch-display {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: var(--gradient-primary);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.watch-screen {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    background: var(--primary-dark);
    border-radius: 50%;
    overflow: hidden;
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.watch-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 10px;
}

.stat-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
}

.watch-time {
    text-align: center;
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
}

/* Download Buttons */
.download-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.download-btn.ios {
    background: linear-gradient(135deg, #000000, #333333);
    color: white;
}

.download-btn.android {
    background: linear-gradient(135deg, #3DDC84, #34A853);
    color: white;
}

.download-btn:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.download-btn i {
    font-size: 24px;
}

/* Sections */
.section {
    padding: 100px 0;
    position: relative;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-info));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 4rem;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-light);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-on-accent);
    font-size: 24px;
    margin-bottom: 1.5rem;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.feature-desc {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Sensors Section */
.sensors-section {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.9));
    border-radius: var(--radius-lg);
    padding: 4rem;
    margin: 0 2rem;
    position: relative;
    overflow: hidden;
}

.sensors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.sensor-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    backdrop-filter: blur(10px);
}

.sensor-icon {
    font-size: 32px;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.sensor-name {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.sensor-spec {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Screenshots */
.screenshots {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.swiper-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.swiper-slide {
    display: flex;
    justify-content: center;
}

.screenshot {
    width: 300px;
    height: 600px;
    background: var(--bg-card);
    border-radius: 40px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 12px solid var(--primary-dark);
    position: relative;
}

.screenshot-content {
    height: 100%;
    background: var(--bg-primary);
    padding: 40px 20px;
    overflow-y: auto;
}

.screenshot-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 20px;
}

.screenshot-time {
    font-size: 14px;
    font-weight: 600;
}

.screenshot-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

/* Doctor Platform */
.doctor-platform {
    padding: 100px 2rem;
}

.platform-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.platform-image {
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-xl);
}

.platform-dashboard {
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 2rem;
    height: 400px;
    overflow: hidden;
    border: 1px solid var(--border-light);
}

/* Download Section */
.download-section {
    text-align: center;
    padding: 100px 2rem;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-radius: var(--radius-lg);
    margin: 0 2rem;
}

.qr-codes {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-top: 3rem;
    flex-wrap: wrap;
}

.qr-container {
    text-align: center;
}

.qr-code {
    width: 200px;
    height: 200px;
    background: white;
    padding: 20px;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
}

.qr-label {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 4rem 2rem 2rem;
    border-top: 1px solid var(--border-light);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.footer-column h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

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

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

.copyright {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid var(--border-light);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-subtitle {
        margin: 0 auto 2rem;
    }
    
    .platform-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .language-selector {
        top: 10px;
        right: 10px;
        padding: 6px 12px;
    }
    
    .language-selector select {
        width: 80px;
        font-size: 12px;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-card-glass);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 1rem;
        border-top: 1px solid var(--border-light);
    }
    
    .nav-links.show {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .watch-container {
        width: 300px;
        height: 300px;
    }
    
    .watch-display {
        width: 240px;
        height: 240px;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .sensors-section {
        padding: 2rem;
        margin: 0 1rem;
    }
    
    .qr-codes {
        flex-direction: column;
        gap: 2rem;
    }
}