:root {
    --primary-color: #FFB74D;
    --primary-dark: #F57C00;
    --secondary-color: #FFF3E0;
    --text-main: #333333;
    --text-sub: #666666;
    --white: #FFFFFF;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --radius: 20px;
}

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

body {
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
    background-color: var(--secondary-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Navbar */
.navbar {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 16px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    font-size: 1.8rem;
}

#language-selector {
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid #ddd;
    background: transparent;
    font-family: inherit;
    cursor: pointer;
    outline: none;
}

/* Hero Section */
.hero {
    padding: 80px 0;
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
}

.hero-content {
    flex: 1;
    min-width: 300px;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--text-main);
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-sub);
    margin-bottom: 40px;
    max-width: 500px;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.btn-primary {
    background-color: var(--primary-dark);
    color: var(--white);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--primary-dark);
    border: 2px solid var(--primary-dark);
}

/* Hero Image & Mockup */
.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    min-width: 300px;
}

.phone-mockup {
    width: 300px;
    height: 600px;
    background: #000;
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow);
    position: relative;
}

.phone-mockup .screen {
    width: 100%;
    height: 100%;
    background: var(--secondary-color);
    border-radius: 28px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.app-header {
    background: var(--white);
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: bold;
    color: var(--text-main);
    padding-top: 40px; /* Status bar space */
}

.app-content {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.card {
    background: var(--white);
    padding: 16px;
    border-radius: 16px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    gap: 16px;
}

.emoji {
    font-size: 24px;
    background: #FFF3E0;
    padding: 10px;
    border-radius: 50%;
}

.streak-badge {
    margin-top: auto;
    background: var(--primary-color);
    color: white;
    padding: 12px;
    border-radius: 16px;
    text-align: center;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

/* Video Section */
.video-section {
    padding: 80px 0;
    background: var(--white);
    text-align: center;
}

.video-section h2 {
    font-size: 2.5rem;
    margin-bottom: 40px;
}

.video-container {
    max-width: 800px;
    margin: 0 auto;
    aspect-ratio: 16/9;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    position: relative;
    background: #000;
}

.video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(45deg, #333, #555);
    color: white;
    cursor: pointer;
}

.play-icon {
    font-size: 4rem;
    margin-bottom: 16px;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.video-placeholder:hover .play-icon {
    opacity: 1;
}

iframe {
    width: 100%;
    height: 100%;
}

/* Features */
.features {
    padding: 100px 0;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--white);
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.icon-box {
    width: 70px;
    height: 70px;
    background: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 28px;
    color: var(--primary-dark);
}

.feature-card h3 {
    margin-bottom: 16px;
    font-size: 1.25rem;
}

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

/* Footer */
.footer {
    background: var(--white);
    padding: 60px 0 30px;
    border-top: 1px solid #eee;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: bold;
    font-size: 1.2rem;
}

.footer-links a {
    color: var(--text-sub);
    text-decoration: none;
    margin-left: 24px;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.copyright {
    text-align: center;
    color: #999;
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero {
        text-align: center;
    }

    .hero .container {
        justify-content: center;
    }
    
    .cta-buttons {
        justify-content: center;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links a {
        margin: 0 12px;
    }
}