/* SkyCetus Light Theme v1.0 */
/* 白色极简版本，替代深色星空主题 */

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f4;
    --text-primary: #1a1a2e;
    --text-secondary: #5f6368;
    --text-muted: #80868b;
    --accent: #1a73e8;
    --accent-light: #e8f0fe;
    --border: #dadce0;
    --border-light: #e8eaed;
    --shadow: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
    --shadow-lg: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --radius: 8px;
    --radius-lg: 12px;
    --max-width: 900px;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, Inconsolata, 'Roboto Mono', monospace;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.8rem; margin-top: 2rem; margin-bottom: 1rem; }
h3 { font-size: 1.3rem; margin-top: 1.5rem; margin-bottom: 0.75rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    text-decoration: underline;
}

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 60px 0;
}

/* Header */
.page-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 60px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.page-header .subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Cards */
.card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 16px;
    transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card h3 {
    margin-top: 0;
    color: var(--accent);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 0.9rem;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

tr:hover {
    background: var(--bg-secondary);
}

/* Metrics */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 30px 0;
}

.metric-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
}

.metric-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 4px;
}

.metric-label {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Highlight Box */
.highlight-box {
    background: var(--accent-light);
    border-left: 4px solid var(--accent);
    padding: 20px;
    margin: 20px 0;
    border-radius: 0 var(--radius) var(--radius) 0;
}

.highlight-box p {
    margin: 0;
    color: var(--text-primary);
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    margin-bottom: 24px;
    padding-left: 20px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -26px;
    top: 4px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-primary);
}

.timeline-date {
    font-weight: 600;
    color: var(--accent);
    font-size: 0.9rem;
    margin-bottom: 4px;
}

/* CTA Section */
.cta-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    margin: 40px 0;
}

.cta-section h3 {
    margin-bottom: 16px;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 40px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Navigation */
.nav {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.nav-links a {
    margin-left: 24px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background: #1557b0;
    text-decoration: none;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    text-decoration: none;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.4rem; }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        display: none;
    }
    
    .page-header {
        padding: 40px 0;
    }
}

/* Print styles */
@media print {
    body {
        background: white;
    }
    
    .nav {
        display: none;
    }
    
    .card {
        break-inside: avoid;
    }
}