:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-text: #1a1a2e;
    --color-text-secondary: #64748b;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-accent: #0ea5e9;
    --color-border: #e2e8f0;
    --color-tag-bg: #eff6ff;
    --color-tag-text: #2563eb;
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width: 780px;
    --radius: 8px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
}

/* Header */
.site-header {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.logo:hover {
    color: var(--color-primary);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
}

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

/* Main */
.site-main {
    flex: 1;
    padding: 2.5rem 0;
}

/* Hero */
.hero {
    text-align: center;
    padding: 2rem 0 3rem;
}

.hero h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.hero-sub {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
}

/* Post list */
.post-list {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.post-card {
    background: var(--color-surface);
    padding: 1.5rem 1.75rem;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    margin-bottom: 1rem;
    transition: box-shadow 0.2s;
}

.post-card:hover {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.post-card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    line-height: 1.4;
}

.post-card h2 a {
    color: var(--color-text);
}

.post-card h2 a:hover {
    color: var(--color-primary);
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.tag {
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    padding: 0.15rem 0.6rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 500;
}

.post-summary {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.btn {
    display: inline-block;
    padding: 0.55rem 1.25rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    font-size: 0.9rem;
    font-weight: 500;
    background: var(--color-surface);
    transition: all 0.2s;
}

.btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Post detail */
.post-detail {
    background: var(--color-surface);
    padding: 2.5rem 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

.post-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.post-header h1 {
    font-size: 1.85rem;
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}

.post-content {
    font-size: 1rem;
    line-height: 1.8;
}

.post-content h2 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.post-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.post-content p {
    margin-bottom: 1.2rem;
}

.post-content ul, .post-content ol {
    margin-bottom: 1.2rem;
    padding-left: 1.5rem;
}

.post-content li {
    margin-bottom: 0.4rem;
}

.post-content blockquote {
    border-left: 3px solid var(--color-primary);
    padding: 0.75rem 1.25rem;
    margin: 1.5rem 0;
    background: var(--color-tag-bg);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--color-text-secondary);
}

.post-content pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 1.25rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 1.5rem 0;
    font-size: 0.9rem;
    line-height: 1.6;
}

.post-content code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.88em;
}

.post-content p code {
    background: #f1f5f9;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
}

.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

.post-content th, .post-content td {
    border: 1px solid var(--color-border);
    padding: 0.6rem 1rem;
    text-align: left;
}

.post-content th {
    background: var(--color-bg);
    font-weight: 600;
}

.post-content img {
    max-width: 100%;
    border-radius: var(--radius);
    margin: 1rem 0;
}

.post-footer {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

/* Page content (about, etc.) */
.page-content {
    background: var(--color-surface);
    padding: 2.5rem 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

.page-content h1 {
    font-size: 1.85rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}

.page-content h2 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-top: 1.75rem;
    margin-bottom: 0.75rem;
}

.page-content p {
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.page-content ul {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.page-content li {
    margin-bottom: 0.4rem;
    color: var(--color-text-secondary);
}

/* Error page */
.error-page {
    text-align: center;
    padding: 4rem 0;
}

.error-page h1 {
    font-size: 4rem;
    font-weight: 700;
    color: var(--color-text-secondary);
}

.error-page p {
    color: var(--color-text-secondary);
    margin: 0.5rem 0 1.5rem;
}

.empty-state {
    text-align: center;
    padding: 3rem 0;
    color: var(--color-text-secondary);
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

/* Market Alert */
.market-alert {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
    border-left: 4px solid var(--color-text-secondary);
}

.market-alert.green { border-left-color: #22c55e; }
.market-alert.yellow { border-left-color: #eab308; }
.market-alert.red { border-left-color: #ef4444; }

.alert-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border);
}

.alert-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-text);
}

.update-time {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.alert-body {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.metric {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.metric .label {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

.metric .value {
    font-size: 1.1rem;
    font-weight: 600;
    font-family: 'SF Mono', monospace;
}

.metric .change {
    font-size: 0.9rem;
    font-weight: 500;
    margin-left: 0.5rem;
}

.change.red { color: #ef4444; }
.change.green { color: #22c55e; }

.status-msg {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    background: #f8fafc;
    padding: 1rem;
    border-radius: 6px;
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    width: fit-content;
}

.status-badge.green { background: #dcfce7; color: #166534; }
.status-badge.yellow { background: #fef9c3; color: #854d0e; }
.status-badge.red { background: #fee2e2; color: #991b1b; }

.recommendations {
    list-style: none;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.recommendations li::before {
    content: "•";
    margin-right: 0.5rem;
    color: var(--color-primary);
}

/* Responsive */
@media (max-width: 640px) {
    .hero h1 {
        font-size: 1.5rem;
    }

    .post-detail, .page-content {
        padding: 1.5rem 1.25rem;
    }

    .post-header h1 {
        font-size: 1.4rem;
    }
}