/* ========================================
   墨记博客 — 样式表
   主题：技术与生活
   ======================================== */

/* ===== CSS 变量 ===== */
:root {
  /* 浅色主题 */
  --bg-primary: #fafafa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f5f5f5;
  --bg-card: #ffffff;
  --bg-code: #f6f8fa;
  --bg-navbar: rgba(255, 255, 255, 0.85);
  --text-primary: #1a1a2e;
  --text-secondary: #555;
  --text-tertiary: #888;
  --text-on-accent: #ffffff;
  --accent: #e74c3c;
  --accent-hover: #c0392b;
  --accent-light: rgba(231, 76, 60, 0.08);
  --border: #e5e5e5;
  --border-light: #f0f0f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.10);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 820px;
  --font-serif: 'Noto Serif SC', Georgia, serif;
  --font-sans: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

[data-theme="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1c2128;
  --bg-card: #161b22;
  --bg-code: #1c2128;
  --bg-navbar: rgba(13, 17, 23, 0.85);
  --text-primary: #e6edf3;
  --text-secondary: #9d9d9d;
  --text-tertiary: #6e7681;
  --text-on-accent: #ffffff;
  --accent: #f97583;
  --accent-hover: #ff8b96;
  --accent-light: rgba(249, 117, 131, 0.12);
  --border: #30363d;
  --border-light: #21262d;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
}

/* ===== 全局重置 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-navbar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary) !important;
}

.logo-icon {
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary) !important;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
}

.nav-link:hover {
  color: var(--text-primary) !important;
  background: var(--bg-tertiary);
}

.nav-link.active {
  color: var(--accent) !important;
  background: var(--accent-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-secondary);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(15deg);
}

.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  justify-content: center;
  align-items: center;
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== 主内容区 ===== */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 100px 24px 60px;
  min-height: calc(100vh - 200px);
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Hero 区域 ===== */
.hero {
  text-align: center;
  padding: 40px 0 50px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto 24px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.hero-tag {
  padding: 6px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.hero-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== 文章列表 ===== */
.section-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 28px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--accent);
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

.article-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border);
  transform: translateY(-2px);
}

.article-card:hover::before {
  transform: scaleY(1);
}

.article-card-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  transition: color var(--transition);
}

.article-card:hover .article-card-title {
  color: var(--accent);
}

.article-card-excerpt {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

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

.article-card-tags {
  display: flex;
  gap: 6px;
  margin-left: auto;
}

.tag-badge {
  padding: 3px 10px;
  background: var(--accent-light);
  color: var(--accent) !important;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 500;
  transition: all var(--transition);
}

.tag-badge:hover {
  background: var(--accent);
  color: var(--text-on-accent) !important;
}

/* ===== 文章详情页 ===== */
.article-detail {
  animation: fadeIn 0.4s ease;
}

.article-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary) !important;
  font-size: 0.9rem;
  margin-bottom: 24px;
  transition: all var(--transition);
}

.article-back:hover {
  color: var(--accent) !important;
  transform: translateX(-4px);
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.article-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-tertiary);
}

.article-meta .meta-divider {
  width: 1px;
  height: 14px;
  background: var(--border);
}

.article-tags-row {
  display: flex;
  gap: 6px;
  margin-top: 12px;
}

/* ===== Markdown 渲染样式 ===== */
.markdown-body {
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  margin-top: 2em;
  margin-bottom: 0.8em;
  line-height: 1.3;
}

.markdown-body h1 { font-size: 1.8rem; }
.markdown-body h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3em;
}
.markdown-body h3 { font-size: 1.25rem; }
.markdown-body h4 { font-size: 1.1rem; }

.markdown-body p {
  margin-bottom: 1.2em;
}

.markdown-body a {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.markdown-body a:hover {
  border-bottom-color: var(--accent);
}

.markdown-body ul,
.markdown-body ol {
  margin: 1em 0;
  padding-left: 1.8em;
}

.markdown-body li {
  margin-bottom: 0.5em;
}

.markdown-body blockquote {
  border-left: 4px solid var(--accent);
  padding: 12px 20px;
  margin: 1.5em 0;
  background: var(--accent-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.markdown-body blockquote p {
  margin-bottom: 0;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}

.markdown-body pre {
  background: var(--bg-code) !important;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 1.5em 0;
  border: 1px solid var(--border);
}

.markdown-body pre code {
  display: block;
  padding: 16px 20px;
  background: none !important;
  color: var(--text-primary);
  font-size: 0.85rem;
  line-height: 1.6;
}

.markdown-body img {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin: 1.5em 0;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.9rem;
}

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

.markdown-body th {
  background: var(--bg-tertiary);
  font-weight: 600;
}

.markdown-body tr:nth-child(even) td {
  background: var(--bg-tertiary);
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

/* ===== 标签页 ===== */
.tags-page {
  animation: fadeIn 0.4s ease;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.tag-cloud-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 24px;
  font-size: 0.95rem;
  color: var(--text-secondary) !important;
  cursor: pointer;
  transition: all var(--transition);
}

.tag-cloud-item:hover {
  border-color: var(--accent);
  color: var(--accent) !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.tag-cloud-item.active {
  background: var(--accent);
  color: var(--text-on-accent) !important;
  border-color: var(--accent);
}

.tag-count {
  background: var(--bg-tertiary);
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.78rem;
  font-weight: 600;
}

.tag-cloud-item.active .tag-count {
  background: rgba(255,255,255,0.25);
}

/* ===== 关于页面 ===== */
.about-page {
  animation: fadeIn 0.4s ease;
}

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

.about-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  margin: 0 auto 20px;
}

.about-name {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 700;
  text-align: center;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.about-bio {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 32px;
}

.about-section {
  margin-top: 28px;
}

.about-section h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.about-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-chip {
  padding: 6px 14px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.about-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
}

.about-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary) !important;
  font-size: 0.9rem;
  transition: all var(--transition);
}

.about-link:hover {
  border-color: var(--accent);
  color: var(--accent) !important;
}

/* ===== 空状态 ===== */
.empty-state {
  text-align: center;
  padding: 80px 20px;
}

.empty-state-icon {
  font-size: 3.5rem;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state-text {
  color: var(--text-tertiary);
  font-size: 1rem;
}

/* ===== 页脚 ===== */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  padding: 40px 24px;
}

.footer-container {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

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

.footer-desc {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

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

.footer-links a:hover {
  color: var(--accent) !important;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

/* ===== 回到顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 900;
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent);
  color: var(--text-on-accent);
  border-color: var(--accent);
}

/* ===== 加载动画 ===== */
.loader {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 80px 0;
}

.loader-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-secondary);
    padding: 16px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-link {
    padding: 12px 16px;
    width: 100%;
  }

  .menu-toggle {
    display: flex;
  }

  .main-content {
    padding: 90px 16px 50px;
  }

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

  .article-title {
    font-size: 1.6rem;
  }

  .article-card {
    padding: 20px;
  }

  .article-card-title {
    font-size: 1.2rem;
  }

  .about-card {
    padding: 24px;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.7rem;
  }

  .article-card-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .article-card-tags {
    margin-left: 0;
  }
}