:root {
    --primary-color: #009688; /* Teal 500 */
    --primary-dark: #00796B;
    --background-color: #F5F5F5;
    --text-color: #333333;
    --card-bg: #FFFFFF;
}

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

body {
    font-family: 'Noto Sans TC', 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 80px 0;
    text-align: center;
    border-bottom-left-radius: 50px;
    border-bottom-right-radius: 50px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.app-icon img {
    width: 120px;
    height: 120px;
    border-radius: 24px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    margin-bottom: 20px;
    background-color: white; /* Fallback */
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    font-weight: 800;
}

.hero .subtitle {
    font-size: 1.5rem;
    opacity: 0.9;
    margin-bottom: 20px;
}

.hero .description {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.9;
}

/* Features Section */
.features {
    padding: 60px 0;
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-dark);
    margin-bottom: 40px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 16px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.feature-card .icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.feature-card h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

/* Footer */
.footer {
    background-color: #333;
    color: #ccc;
    padding: 40px 0;
    text-align: center;
    margin-top: 40px;
}

.footer-links {
    margin-top: 15px;
}

.footer-links a {
    color: white;
    text-decoration: none;
    margin: 0 10px;
    font-size: 0.9rem;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-links a:hover {
    opacity: 1;
}

/* Responsive */
@media (max-width: 600px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    .hero {
        padding: 50px 0;
        border-radius: 0;
    }
}