:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --background: #fafafa;
    --text: #0f172a;
    --text-light: #64748b;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #2563eb, #4f46e5);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --radius: 16px;
}

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

body {
    font-family: 'Noto Sans TC', sans-serif;
    line-height: 1.5;
    color: var(--text);
    background: var(--background);
}

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

/* Header */
header {
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
}

nav {
    height: 80px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    background: var(--gradient);
    -webkit-background-clip: text;
    color: transparent;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    margin-left: 32px;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.nav-cta {
    background: var(--gradient);
    color: var(--white) !important;
    padding: 8px 20px;
    border-radius: 100px;
}

/* Hero Section */
.hero {
    padding: 160px 0 120px;
    background: var(--white);
}

.hero-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

h1 {
    font-size: 4rem;
    line-height: 1.2;
    margin-bottom: 24px;
    font-weight: 600;
}

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    color: transparent;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 40px;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--gradient);
    color: var(--white);
    text-decoration: none;
    padding: 16px 32px;
    border-radius: 100px;
    font-weight: 500;
    transition: transform 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
}

/* Features Section */
.features {
    padding: 120px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

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

.section-header p {
    color: var(--text-light);
    font-size: 1.25rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.feature-number {
    font-size: 3rem;
    font-weight: 300;
    color: var(--primary);
    opacity: 0.2;
    display: block;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

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

/* Why Us Section */
.why-us {
    padding: 120px 0;
    background: var(--white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 64px;
}

.advantage-card {
    background: var(--background);
    padding: 40px;
    border-radius: var(--radius);
    transition: transform 0.3s ease;
}

.advantage-card:hover {
    transform: translateY(-4px);
}

.advantage-icon {
    font-size: 2.5rem;
    margin-bottom: 24px;
}

.advantage-card h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
    font-weight: 500;
}

.advantage-card p {
    color: var(--text-light);
    font-size: 1.125rem;
}

/* Download Section */
.download {
    padding: 120px 0;
    background: var(--white);
}

.download-content {
    text-align: center;
}

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

.download-content p {
    color: var(--text-light);
    margin-bottom: 32px;
}

.store-button {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: var(--text);
    color: var(--white);
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.store-button:hover {
    transform: translateY(-2px);
}

.store-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.2;
}

.store-text small {
    font-size: 0.75rem;
    opacity: 0.8;
}

.store-text strong {
    font-size: 1.125rem;
}

/* Footer */
footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-light);
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
    
    .nav-links a:not(.nav-cta) {
        display: none;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .hero {
        padding: 120px 0 80px;
    }
    
    .features, .download {
        padding: 80px 0;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
}