/* ============================================
   认知觉醒博客 - CSS 样式表
   ============================================ */

:root {
    --primary-color: #5b8a72;
    --primary-dark: #4a7260;
    --primary-light: #7aa896;
    --accent-color: #c9a959;
    --accent-light: #e0c97a;
    --bg-color: #faf9f7;
    --bg-secondary: #f5f3f0;
    --text-primary: #2c3e35;
    --text-secondary: #5a6b60;
    --text-muted: #8a9a90;
    --border-color: #e5e2dd;
    --shadow-color: rgba(44, 62, 53, 0.08);

    --font-sans: 'Noto Serif SC', 'Source Han Serif SC', 'Source Han Serif CN',
                 'PingFang SC', 'Microsoft YaHei', Georgia, serif;
    --font-mono: 'Fira Code', 'Source Code Pro', Consolas, monospace;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;

    --container-max: 900px;
    --container-narrow: 680px;
}

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

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.8;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

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

/* Header */
.header {
    background: rgba(250, 249, 247, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.125rem;
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    z-index: 99;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.mobile-menu.show {
    opacity: 1;
    transform: translateY(0);
}

.mobile-nav-link {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 1rem;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

/* Main */
.main {
    flex: 1;
    padding: var(--spacing-3xl) 0;
}

/* Hero */
.hero {
    text-align: center;
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--border-color);
}

.hero-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.05em;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Post List */
.post-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.post-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-color);
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
    cursor: pointer;
}

.post-card:hover {
    box-shadow: 0 8px 30px var(--shadow-color);
    transform: translateY(-2px);
}

.post-card.featured {
    border-left: 4px solid var(--accent-color);
}

.post-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.post-date, .post-views {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.post-title {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
    transition: color var(--transition-fast);
}

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

.post-excerpt {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.8125rem;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.tag:hover {
    background: var(--primary-color);
    color: white;
}

/* Post Detail */
.post-detail {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.post-header {
    text-align: center;
    padding-bottom: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--border-color);
}

.post-detail-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.3;
}

.post-detail-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.9375rem;
}

.post-detail-meta span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.post-detail-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-xl);
}

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

/* Markdown Content */
.post-content {
    font-size: 1.0625rem;
    line-height: 1.85;
    color: var(--text-primary);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
    font-family: var(--font-sans);
    color: var(--text-primary);
    margin-top: 2em;
    margin-bottom: 0.75em;
    line-height: 1.4;
    font-weight: 600;
}

.post-content h1 { font-size: 1.75rem; }
.post-content h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.5em; }
.post-content h3 { font-size: 1.25rem; }
.post-content h4 { font-size: 1.125rem; }

.post-content p {
    margin-bottom: 1.5em;
}

.post-content a {
    color: var(--primary-color);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.post-content strong {
    font-weight: 600;
}

.post-content ul,
.post-content ol {
    margin: 1.5em 0;
    padding-left: 1.75em;
}

.post-content li {
    margin-bottom: 0.75em;
}

.post-content blockquote {
    margin: 2em 0;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--bg-secondary);
    border-left: 4px solid var(--primary-color);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-secondary);
    font-style: italic;
}

.post-content blockquote p:last-child {
    margin-bottom: 0;
}

.post-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--bg-secondary);
    padding: 0.15em 0.4em;
    border-radius: var(--radius-sm);
    color: var(--primary-dark);
}

.post-content pre {
    margin: 2em 0;
    padding: var(--spacing-lg);
    background: #f6f8fa;
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.post-content pre code {
    background: none;
    padding: 0;
    font-size: 0.875rem;
    line-height: 1.6;
}

.post-content table {
    width: 100%;
    margin: 2em 0;
    border-collapse: collapse;
}

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

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

.post-content tr:nth-child(even) {
    background: var(--bg-secondary);
}

.post-content hr {
    margin: 3em 0;
    border: none;
    border-top: 1px solid var(--border-color);
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

/* Tags Page */
.tags-page {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.tags-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--spacing-md);
}

.tag-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.tag-card:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--shadow-color);
}

.tag-card-name {
    font-size: 0.9375rem;
    font-weight: 500;
}

.tag-card-count {
    font-size: 0.8125rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    color: var(--text-muted);
}

.tag-card:hover .tag-card-count {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.tag-posts-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.tag-posts-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.tag-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
}

/* About Page */
.about-page {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.about-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.about-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin: 0 auto var(--spacing-lg);
    box-shadow: 0 4px 20px var(--shadow-color);
}

.about-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.about-subtitle {
    color: var(--text-muted);
    font-size: 0.9375rem;
}

.about-content {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    border: 1px solid var(--border-color);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.empty-state-text {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.empty-state-hint {
    font-size: 0.875rem;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-2xl) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    text-align: center;
}

.footer-slogan {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    font-style: italic;
}

.footer-copyright {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.footer-link {
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.footer-divider {
    color: var(--text-muted);
}

/* Loading */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

.loading::after {
    content: '';
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
        --spacing-3xl: 2.5rem;
    }

    .nav {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu {
        display: block;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .post-detail-title {
        font-size: 1.5rem;
    }

    .post-detail-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

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

    .tags-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .post-meta {
        flex-wrap: wrap;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}