/* style.css */
:root {
    --bg-color: #f8f9fa; 
    --text-main: #202124;
    --text-sub: #5f6368;
    --card-bg: #ffffff;
    --accent-color: #1a73e8; 
    --radius: 24px; 
    --spacing: 24px;
}

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

body {
    font-family: 'Google Sans', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    margin-bottom: 60px;
}
.logo { font-size: 1.5rem; font-weight: bold; letter-spacing: -0.5px; }
nav ul { display: flex; gap: 30px; list-style: none; }
nav a { font-weight: 500; color: var(--text-sub); transition: color 0.3s; }
nav a:hover { color: var(--text-main); }
.nav-active { color: var(--text-main); font-weight: 700; }

.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 100px;
    align-items: center;
}
.hero-text h1 { font-size: 4rem; line-height: 1.1; margin-bottom: 24px; font-weight: 400; }
.hero-text p { font-size: 1.25rem; color: var(--text-sub); margin-bottom: 32px; max-width: 80%; }
.hero-visual {
    border-radius: var(--radius);
    aspect-ratio: 16/9; 
    overflow: hidden;
    background-color: #e0e0e0;
}
.hero-visual img { width: 100%; height: 100%; object-fit: cover; display: block; }

.section-title {
    font-size: 2rem; margin-bottom: 40px; display: flex; justify-content: space-between; align-items: end;
}
.grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: var(--spacing); margin-bottom: 100px;
}
.card {
    background: var(--card-bg); border-radius: var(--radius); overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease; display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-5px); box-shadow: 0 10px 30px rgba(0,0,0,0.05); }
.card-image { width: 100%; aspect-ratio: 3/4; background-color: #eee; position: relative; overflow: hidden; }
.card-image img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card-tag {
    position: absolute; top: 16px; left: 16px; background: rgba(255,255,255,0.9);
    padding: 4px 12px; border-radius: 20px; font-size: 0.8rem; font-weight: bold; z-index: 10;
}
.card-content { padding: 24px; flex-grow: 1; display: flex; flex-direction: column; justify-content: space-between; }
.card h3 { font-size: 1.5rem; margin-bottom: 12px; font-weight: 500; }
.card p { color: var(--text-sub); font-size: 0.95rem; margin-bottom: 20px; }
.card-link { font-weight: 600; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.5px; }

footer {
    border-top: 1px solid #e0e0e0; padding: 60px 0; color: var(--text-sub); font-size: 0.9rem;
    display: flex; flex-direction: column; align-items: center; text-align: center;
}
.qr-section { margin-bottom: 40px; display: flex; flex-direction: column; align-items: center; }
.qr-images { display: flex; gap: 24px; margin-bottom: 16px; }
.qr-code {
    width: 120px; height: 120px; background-color: #eee; border-radius: 12px;
    object-fit: cover; box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.qr-text { font-size: 1rem; font-weight: 500; color: var(--text-main); letter-spacing: 0.5px; }

/* About 页面专属样式 */
.about-content {
    max-width: 800px;
    margin: 0 auto 100px auto;
    font-size: 1.1rem;
    color: var(--text-sub);
}
.about-content h2 { color: var(--text-main); font-size: 2.5rem; margin-bottom: 24px; }
.about-content p { margin-bottom: 20px; }