/* ============================================
   程序人生随记 - 主样式表
   ============================================ */

/* === CSS 变量 === */
:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #dbeafe;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-light: #94a3b8;
    --color-border: #e2e8f0;
    --color-card-bg: #ffffff;
    --color-footer-bg: #0f172a;
    --color-footer-text: #94a3b8;
    --color-footer-heading: #f1f5f9;
    --color-code-bg: #f1f5f9;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.1);
    --max-width: 1200px;
    --header-height: 64px;
    --transition: 0.25s ease;
}

/* === Reset & Base === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

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

/* === Header === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--color-primary), #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo:hover {
    opacity: 0.85;
}

.nav {
    display: flex;
    gap: 2px;
}

.nav-link {
    padding: 8px 18px;
    color: var(--color-text-secondary);
    font-size: 0.925rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.nav-link:hover {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

.nav-link.active {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

/* === Mobile Menu === */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 12px;
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.mobile-menu.active {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mobile-link {
    display: block;
    padding: 12px 16px;
    color: var(--color-text-secondary);
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

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

/* === Hero Section === */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #eff6ff 0%, #f5f3ff 50%, #fce7f3 100%);
    text-align: center;
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
}

.hero-title {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.2;
    color: var(--color-text);
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    margin-bottom: 36px;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-2px);
}

/* === Section === */
.section {
    padding: 72px 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 40px;
}

.section-title {
    font-size: 1.65rem;
    font-weight: 700;
    color: var(--color-text);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
}

.section-more {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-primary);
}

.section-more:hover {
    text-decoration: underline;
}

/* === Article Grid === */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.article-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.card-category {
    display: inline-block;
    align-self: flex-start;
    padding: 4px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    border-radius: 20px;
    margin-bottom: 14px;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 12px;
}

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

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

.card-excerpt {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 18px;
    flex: 1;
}

.card-meta {
    display: flex;
    gap: 16px;
    font-size: 0.825rem;
    color: var(--color-text-light);
    padding-top: 14px;
    border-top: 1px solid var(--color-border);
}

.card-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* === Categories Grid === */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 32px 20px;
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
    color: var(--color-text);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
    color: var(--color-text);
}

.category-icon {
    font-size: 2.2rem;
    margin-bottom: 12px;
    line-height: 1;
}

.category-name {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.category-count {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

/* === Article Detail Page === */
.article-detail {
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 60px;
}

.article-header {
    max-width: 780px;
    margin: 0 auto 48px;
    text-align: center;
}

.article-header .card-category {
    align-self: center;
    font-size: 0.85rem;
    padding: 6px 16px;
    margin-bottom: 20px;
}

.article-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.article-header .card-meta {
    justify-content: center;
    border: none;
    padding: 0;
    font-size: 0.9rem;
}

.article-body {
    max-width: 780px;
    margin: 0 auto;
    font-size: 1.05rem;
    line-height: 1.85;
    color: #334155;
}

.article-body h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-text);
    margin-top: 48px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
}

.article-body h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin-top: 32px;
    margin-bottom: 12px;
}

.article-body p {
    margin-bottom: 18px;
}

.article-body ul,
.article-body ol {
    margin: 12px 0 18px 24px;
}

.article-body li {
    margin-bottom: 8px;
}

.article-body pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 20px 24px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 24px 0;
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

.article-body code {
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.88em;
    background: var(--color-code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    color: #e11d48;
}

.article-body pre code {
    background: none;
    padding: 0;
    color: inherit;
    font-size: inherit;
}

.article-body blockquote {
    border-left: 4px solid var(--color-primary);
    background: var(--color-primary-light);
    padding: 16px 20px;
    margin: 24px 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-text-secondary);
}

.article-body blockquote p:last-child {
    margin-bottom: 0;
}

.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 0.95rem;
}

.article-body th,
.article-body td {
    border: 1px solid var(--color-border);
    padding: 10px 14px;
    text-align: left;
}

.article-body th {
    background: var(--color-bg-alt);
    font-weight: 600;
}

.article-body tr:nth-child(even) {
    background: var(--color-bg-alt);
}

/* === Pagination / Post Navigation === */
.post-nav {
    max-width: 780px;
    margin: 60px auto 0;
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.post-nav a {
    font-size: 0.9rem;
    font-weight: 500;
    max-width: 45%;
}

.post-nav .prev::before {
    content: '← ';
}

.post-nav .next::after {
    content: ' →';
}

/* === Article List Page === */
.page-header {
    padding: calc(var(--header-height) + 60px) 0 40px;
    background: var(--color-bg-alt);
    text-align: center;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.page-header p {
    color: var(--color-text-secondary);
    font-size: 1.05rem;
}

/* === About Page === */
.about-section {
    padding: calc(var(--header-height) + 60px) 0 60px;
}

.about-content {
    max-width: 780px;
    margin: 0 auto;
}

.about-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 40px;
    margin-bottom: 16px;
    color: var(--color-text);
}

.about-content p {
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0;
}

.tag {
    display: inline-block;
    padding: 6px 16px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-primary);
    background: var(--color-primary-light);
    border-radius: 20px;
}

/* === Footer === */
.footer {
    background: var(--color-footer-bg);
    color: var(--color-footer-text);
    padding: 60px 0 0;
    margin-top: auto;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 40px;
}

.footer-logo {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--color-footer-heading);
    margin-bottom: 12px;
}

.footer-desc {
    font-size: 0.9rem;
    line-height: 1.7;
    max-width: 320px;
}

.footer-heading {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-footer-heading);
    margin-bottom: 16px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    color: var(--color-footer-text);
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 24px 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: 8px;
    font-size: 0.85rem;
}

.icp a {
    color: var(--color-footer-text);
}

.icp a:hover {
    color: #fff;
}

/* === Responsive === */
@media (max-width: 1024px) {
    .article-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }

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

    .hero {
        padding: 120px 0 60px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section {
        padding: 48px 0;
    }

    .article-grid {
        grid-template-columns: 1fr;
    }

    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .article-header h1 {
        font-size: 1.7rem;
    }

    .article-body {
        font-size: 1rem;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .post-nav {
        flex-direction: column;
        gap: 12px;
    }

    .post-nav a {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 16px;
    }

    .section-title {
        font-size: 1.35rem;
    }

    .article-card {
        padding: 20px;
    }
}

/* === Print === */
@media print {
    .header,
    .mobile-menu,
    .footer {
        display: none;
    }

    .hero {
        padding: 40px 0;
    }

    .article-detail {
        padding-top: 20px;
    }
}