/* ==========================================================
 * 科幻博客主题 - 主样式表
 * 深色为默认主题（科幻基底），浅色通过 [data-theme="light"] 切换
 * ========================================================== */

/* ---------- CSS 变量 ---------- */
:root {
  --bg-deep: #05070f;
  --bg-primary: #0a0e1a;
  --bg-secondary: #101627;
  --bg-card: rgba(16, 22, 39, 0.75);
  --bg-card-hover: rgba(22, 30, 52, 0.9);
  --border-glow: rgba(56, 189, 248, 0.25);
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #38bdf8;
  --accent-strong: #0ea5e9;
  --accent-glow: rgba(56, 189, 248, 0.6);
  --accent-2: #a78bfa;
  --gradient-text: linear-gradient(120deg, #38bdf8, #a78bfa, #f472b6);
  --code-bg: #0d1326;
  --shadow-card: 0 8px 32px rgba(2, 6, 23, 0.6);
  --meteor-color: rgba(165, 220, 255, 0.9);
  --star-color: #ffffff;
  --nav-bg: rgba(10, 14, 26, 0.85);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-deep: #e8eef7;
  --bg-primary: #f2f6fc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --border-glow: rgba(14, 165, 233, 0.3);
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #0284c7;
  --accent-strong: #0369a1;
  --accent-glow: rgba(2, 132, 199, 0.45);
  --accent-2: #7c3aed;
  --gradient-text: linear-gradient(120deg, #0369a1, #7c3aed, #db2777);
  --code-bg: #1e293b;
  --shadow-card: 0 8px 32px rgba(148, 163, 184, 0.25);
  --meteor-color: rgba(2, 132, 199, 0.55);
  --star-color: #0369a1;
  --nav-bg: rgba(242, 246, 252, 0.88);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

::selection { background: var(--accent); color: #fff; }

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-2); }

/* ---------- 流星/星空背景 ---------- */
.space-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 70% -10%, rgba(56, 189, 248, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 20% 110%, rgba(167, 139, 250, 0.1), transparent),
    var(--bg-primary);
  transition: background var(--transition);
}

/* 闪烁星星 */
.star {
  position: absolute;
  border-radius: 50%;
  background: var(--star-color);
  animation: twinkle var(--twinkle-dur, 3s) ease-in-out infinite;
  opacity: 0;
}

@keyframes twinkle {
  0%, 100% { opacity: 0; transform: scale(0.6); }
  50% { opacity: var(--twinkle-max, 0.8); transform: scale(1); }
}

/* 流星 */
.meteor {
  position: absolute;
  top: var(--meteor-top, 10%);
  left: var(--meteor-left, 80%);
  width: 2px;
  height: 2px;
  border-radius: 2px;
  background: #fff;
  box-shadow: 0 0 6px 1px var(--meteor-color);
  transform: rotate(-35deg);
  opacity: 0;
  animation: meteor-streak var(--meteor-dur, 2.5s) linear infinite;
  animation-delay: var(--meteor-delay, 0s);
}

.meteor::before {
  content: '';
  position: absolute;
  top: 50%;
  right: 0;
  width: var(--meteor-len, 130px);
  height: 1.5px;
  transform: translateY(-50%);
  background: linear-gradient(90deg, transparent, var(--meteor-color));
  border-radius: 999px;
}

@keyframes meteor-streak {
  0% { opacity: 0; transform: rotate(-35deg) translateX(0); }
  5% { opacity: 1; }
  60% { opacity: 1; }
  100% { opacity: 0; transform: rotate(-35deg) translateX(calc(-1 * var(--meteor-dist, 70vw))); }
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem clamp(1.25rem, 4vw, 3rem);
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-glow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.brand:hover { color: var(--accent); }

.brand .logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 1.1rem;
  box-shadow: 0 0 18px var(--accent-glow);
  animation: logo-pulse 3s ease-in-out infinite;
}

@keyframes logo-pulse {
  0%, 100% { box-shadow: 0 0 12px var(--accent-glow); }
  50% { box-shadow: 0 0 26px var(--accent-glow); }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 0.45rem 0.95rem;
  border-radius: 8px;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover { color: var(--accent); background: rgba(56, 189, 248, 0.08); }

.nav-links a.active {
  color: var(--accent);
  background: rgba(56, 189, 248, 0.12);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  transform: translateX(-50%);
}

/* 主题切换按钮 */
.theme-toggle, .admin-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border-glow);
  border-radius: 10px;
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 1.15rem;
  transition: transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
}

.admin-link:hover {
  transform: scale(1.08);
  box-shadow: 0 0 16px var(--accent-glow);
  color: var(--accent);
}

.theme-toggle:hover {
  transform: rotate(30deg) scale(1.08);
  box-shadow: 0 0 16px var(--accent-glow);
}

/* 移动端菜单按钮 */
.menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border-glow);
  border-radius: 10px;
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 1.1rem;
}

/* ---------- 通用布局 ---------- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem clamp(1.25rem, 4vw, 2.5rem) 4rem;
}

.page-header {
  text-align: center;
  margin-bottom: 3rem;
}

.page-header h1 {
  font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: 0.06em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.page-header .subtitle {
  margin-top: 0.6rem;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* ---------- Hero 区（首页） ---------- */
.hero {
  text-align: center;
  padding: clamp(3rem, 8vw, 5.5rem) 1rem 3.5rem;
}

.hero h1 {
  font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
  font-size: clamp(2rem, 5.5vw, 3.4rem);
  letter-spacing: 0.05em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  animation: hero-glow 4s ease-in-out infinite;
}

@keyframes hero-glow {
  0%, 100% { filter: drop-shadow(0 0 12px rgba(56, 189, 248, 0.25)); }
  50% { filter: drop-shadow(0 0 26px rgba(56, 189, 248, 0.45)); }
}

.hero .typing-line {
  margin-top: 1rem;
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.hero .typing-line .cursor {
  display: inline-block;
  width: 8px;
  background: var(--accent);
  animation: blink 1s step-end infinite;
  margin-left: 2px;
}

@keyframes blink { 50% { opacity: 0; } }

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin-top: 2.2rem;
  flex-wrap: wrap;
}

.hero-stats .stat {
  text-align: center;
}

.hero-stats .stat-num {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  text-shadow: 0 0 14px var(--accent-glow);
}

.hero-stats .stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* ---------- 文章卡片 ---------- */
.section-title {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
  font-size: 1.3rem;
  margin-bottom: 1.8rem;
  color: var(--text-primary);
}

.section-title::before {
  content: '';
  width: 4px;
  height: 1.3em;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 10px var(--accent-glow);
}

.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.5rem;
}

.article-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  padding: 1.6rem;
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  overflow: hidden;
  cursor: pointer;
}

.article-card::before {
  /* 扫光效果 */
  content: '';
  position: absolute;
  top: 0;
  left: -80%;
  width: 55%;
  height: 100%;
  background: linear-gradient(105deg, transparent, rgba(148, 197, 255, 0.08), transparent);
  transform: skewX(-20deg);
  transition: left 0.6s ease;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: 0 12px 40px rgba(2, 6, 23, 0.7), 0 0 24px var(--accent-glow);
}

.article-card:hover::before { left: 130%; }

.article-card .card-cover {
  font-size: 2rem;
  line-height: 1;
  filter: drop-shadow(0 0 10px var(--accent-glow));
}

.article-card h3 {
  font-size: 1.12rem;
  line-height: 1.5;
  color: var(--text-primary);
  transition: color var(--transition);
}

.article-card:hover h3 { color: var(--accent); }

.article-card .card-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.card-date {
  font-family: 'JetBrains Mono', monospace;
  white-space: nowrap;
  flex-shrink: 0;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.45rem;
}

.tag-chip {
  display: inline-block;
  padding: 0.18rem 0.65rem;
  font-size: 0.78rem;
  border-radius: 999px;
  border: 1px solid var(--border-glow);
  color: var(--accent);
  background: rgba(56, 189, 248, 0.06);
  transition: all var(--transition);
  white-space: nowrap;
}

.tag-chip:hover, .tag-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 0 12px var(--accent-glow);
}

/* ---------- 标签页 ---------- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem;
  margin-bottom: 2.5rem;
}

.tag-cloud .tag-chip { font-size: 0.92rem; padding: 0.35rem 1rem; }
.tag-cloud .tag-chip .tag-count { opacity: 0.7; margin-left: 0.25rem; }

/* ---------- 文章详情页 ---------- */
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 2.5rem;
  align-items: start;
}

.article-hero {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-glow);
}

.article-hero .back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1.2rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.article-hero .back-link:hover { color: var(--accent); transform: translateX(-3px); }

.article-hero h1 {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  line-height: 1.45;
  margin-bottom: 1rem;
}

.article-hero .article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.article-hero .article-meta .meta-date {
  font-family: 'JetBrains Mono', monospace;
}

/* Markdown 正文 */
.markdown-body {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  padding: clamp(1.5rem, 4vw, 2.8rem);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(8px);
  overflow-wrap: break-word;
}

.markdown-body h2 {
  font-size: 1.45rem;
  margin: 2.2rem 0 1rem;
  padding-left: 0.8rem;
  border-left: 4px solid var(--accent);
  box-shadow: inset 3px 0 8px -6px var(--accent-glow);
}

.markdown-body h3 {
  font-size: 1.18rem;
  margin: 1.8rem 0 0.8rem;
  color: var(--accent);
}

.markdown-body h4 { font-size: 1.02rem; margin: 1.4rem 0 0.6rem; }

.markdown-body p { margin: 0.9rem 0; }

.markdown-body a {
  border-bottom: 1px dashed var(--accent);
}

.markdown-body blockquote {
  margin: 1.2rem 0;
  padding: 0.8rem 1.2rem;
  border-left: 3px solid var(--accent);
  background: rgba(56, 189, 248, 0.06);
  border-radius: 0 10px 10px 0;
  color: var(--text-secondary);
}

.markdown-body ul, .markdown-body ol {
  margin: 0.9rem 0;
  padding-left: 1.6rem;
}

.markdown-body li { margin: 0.4rem 0; }

.markdown-body code {
  font-family: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  font-size: 0.88em;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent);
  padding: 0.15em 0.45em;
  border-radius: 6px;
}

.markdown-body pre {
  position: relative;
  margin: 1.3rem 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-glow);
}

.markdown-body pre code {
  display: block;
  padding: 1.4rem 1.2rem 1.1rem;
  background: var(--code-bg) !important;
  color: #e2e8f0;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.7;
  border-radius: 0;
}

/* 代码块顶部语言标签 */
.markdown-body pre .code-lang {
  position: absolute;
  top: 0;
  right: 0;
  padding: 0.22rem 0.75rem;
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: rgba(56, 189, 248, 0.1);
  border-radius: 0 0 0 8px;
  text-transform: uppercase;
  user-select: none;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.3rem 0;
  font-size: 0.92rem;
  display: block;
  overflow-x: auto;
}

.markdown-body th, .markdown-body td {
  border: 1px solid var(--border-glow);
  padding: 0.6rem 0.9rem;
  text-align: left;
}

.markdown-body th {
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
}

.markdown-body tr:hover td { background: rgba(56, 189, 248, 0.04); }

.markdown-body hr {
  border: none;
  height: 1px;
  margin: 2rem 0;
  background: linear-gradient(90deg, transparent, var(--border-glow), transparent);
}

.markdown-body img { max-width: 100%; border-radius: 10px; }

/* 文章目录 */
.toc {
  position: sticky;
  top: 90px;
  padding: 1.3rem 1.4rem;
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  font-size: 0.86rem;
}

.toc-title {
  font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
  font-size: 0.95rem;
  margin-bottom: 0.9rem;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.toc ul { list-style: none; }
.toc li { margin: 0.3rem 0; }

.toc a {
  display: block;
  padding: 0.28rem 0.6rem;
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.toc a:hover, .toc a.toc-active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: rgba(56, 189, 248, 0.06);
}

/* 文章底部 */
.article-footer {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-glow);
}

.article-footer .footer-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 2rem;
}

.article-footer .footer-label {
  color: var(--text-muted);
  font-size: 0.88rem;
}

/* 相关文章 */
.related-articles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
}

.related-card {
  padding: 1.1rem 1.3rem;
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  background: var(--bg-card);
  cursor: pointer;
  transition: all var(--transition);
}

.related-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.related-card .rel-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

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

.related-card .rel-date {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

/* ---------- 关于页 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 2.5rem;
  align-items: start;
}

/* 后台自定义的关于页内容：单栏 Markdown */
.about-grid.about-custom {
  grid-template-columns: minmax(0, 1fr);
}
.about-markdown {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-glow);
  border-radius: 1rem;
  padding: 2rem 2.2rem;
}

.about-card {
  text-align: center;
  padding: 2.2rem 1.8rem;
  border: 1px solid var(--border-glow);
  border-radius: 18px;
  background: var(--bg-card);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(8px);
}

.avatar {
  width: 110px;
  height: 110px;
  margin: 0 auto 1.2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(167, 139, 250, 0.2));
  border: 2px solid var(--accent);
  box-shadow: 0 0 26px var(--accent-glow);
  animation: avatar-float 4s ease-in-out infinite;
}

@keyframes avatar-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.about-card h2 { font-size: 1.4rem; }

.about-card .about-role {
  margin-top: 0.3rem;
  color: var(--accent);
  font-size: 0.92rem;
  font-family: 'JetBrains Mono', monospace;
}

.about-card .about-bio {
  margin-top: 1rem;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.contact-list {
  list-style: none;
  margin-top: 1.6rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--border-glow);
  text-align: left;
}

.contact-list li {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.45rem 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.contact-list .contact-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  background: rgba(56, 189, 248, 0.1);
  font-size: 0.95rem;
  flex-shrink: 0;
}

.contact-list a { color: var(--text-secondary); word-break: break-all; }
.contact-list a:hover { color: var(--accent); }

/* 技能条 */
.skill-item { margin-bottom: 1.3rem; }

.skill-item .skill-name {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  margin-bottom: 0.45rem;
}

.skill-item .skill-name .skill-pct {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
}

.skill-bar {
  height: 8px;
  border-radius: 999px;
  background: rgba(100, 116, 139, 0.2);
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 10px var(--accent-glow);
  width: 0;
  transition: width 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}

.about-section h2 {
  font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
  font-size: 1.25rem;
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.about-section h2::before {
  content: '';
  width: 4px;
  height: 1.2em;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}

.about-section { margin-bottom: 2.5rem; }

.about-section p { color: var(--text-secondary); }

/* 时间线 */
.timeline { position: relative; padding-left: 1.6rem; }

.timeline::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2), transparent);
}

.timeline-item { position: relative; padding-bottom: 1.5rem; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.6rem;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.timeline-item .tl-time {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent);
}

.timeline-item .tl-title { font-weight: 600; margin: 0.15rem 0; }

.timeline-item .tl-desc { font-size: 0.9rem; color: var(--text-secondary); }

/* ---------- 代码高亮 Token 配色 ---------- */
.markdown-body .tok-comment { color: #64748b; font-style: italic; }
.markdown-body .tok-string { color: #7dd3a8; }
.markdown-body .tok-number { color: #f0a868; }
.markdown-body .tok-keyword { color: #c792ea; font-weight: 500; }
.markdown-body .tok-func { color: #62c9f5; }
.markdown-body .tok-selector { color: #f472b6; }
.markdown-body .tok-property { color: #7dd3fc; }
.markdown-body .tok-key { color: #62c9f5; }

[data-theme="light"] .markdown-body .tok-comment { color: #94a3b8; }
[data-theme="light"] .markdown-body .tok-string { color: #0f766e; }
[data-theme="light"] .markdown-body .tok-number { color: #b45309; }
[data-theme="light"] .markdown-body .tok-keyword { color: #7c3aed; }
[data-theme="light"] .markdown-body .tok-func { color: #0369a1; }
[data-theme="light"] .markdown-body .tok-selector { color: #be185d; }
[data-theme="light"] .markdown-body .tok-property { color: #0284c7; }
[data-theme="light"] .markdown-body .tok-key { color: #0369a1; }

/* 代码块在浅色主题下保持深色底（高亮 token 适配深底） */

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border-glow);
  padding: 2rem clamp(1.25rem, 4vw, 3rem);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.86rem;
  background: var(--nav-bg);
}

.footer .footer-brand {
  font-family: 'Orbitron', sans-serif;
  color: var(--accent);
  letter-spacing: 0.06em;
}

.footer p { margin: 0.3rem 0; }

/* ---------- 空状态 / 加载 ---------- */
.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-muted);
}

.empty-state .empty-icon { font-size: 3rem; display: block; margin-bottom: 1rem; }

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  border-radius: 999px;
  border: 2px solid var(--bg-deep);
}

/* ---------- 回到顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 1.4rem;
  bottom: 1.4rem;
  z-index: 90;
  width: 2.8rem;
  height: 2.8rem;
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  color: var(--accent);
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: all var(--transition);
}

.back-to-top.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover { box-shadow: 0 0 18px var(--accent-glow); }

/* ---------- 背景音乐播放器 ---------- */
.music-player {
  position: fixed;
  left: 1.4rem;
  bottom: 1.4rem;
  z-index: 90;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.music-player .mp-toggle {
  width: 2.8rem;
  height: 2.8rem;
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  color: var(--accent);
  font-size: 1.15rem;
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
}

.music-player .mp-toggle:hover { box-shadow: 0 0 18px var(--accent-glow); }

.music-player .mp-panel {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--border-glow);
  border-radius: 12px;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  opacity: 0;
  transform: translateX(-10px);
  pointer-events: none;
  transition: all var(--transition);
  max-width: min(20rem, calc(100vw - 6rem));
}

.music-player.mp-open .mp-panel {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.music-player .mp-play {
  width: 2.1rem;
  height: 2.1rem;
  border: 1px solid var(--accent);
  border-radius: 50%;
  background: transparent;
  color: var(--accent);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
  line-height: 1;
}

.music-player.mp-playing .mp-play {
  background: var(--accent);
  color: var(--bg-deep, #0b1020);
}

.music-player .mp-info {
  min-width: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.music-player .mp-title {
  font-size: 0.78rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 10rem;
}

.music-player .mp-hint {
  font-size: 0.68rem;
  color: var(--text-secondary, #9aa4b2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 10rem;
  opacity: 0.85;
}

.music-player .mp-track {
  font-size: 0.72rem;
  color: inherit;
  background: var(--bg-deep, transparent);
  border: 1px solid var(--border-glow);
  border-radius: 6px;
  padding: 0.1rem 0.3rem;
  max-width: 10rem;
  cursor: pointer;
}

.music-player .mp-volume {
  width: 4.5rem;
  height: 4px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

@media (max-width: 720px) {
  .music-player { left: 1rem; bottom: 1rem; }
  .music-player .mp-panel { gap: 0.45rem; padding: 0.4rem 0.6rem; }
  .music-player .mp-volume { width: 3.2rem; }
  .music-player .mp-title { max-width: 6rem; }
}

/* ---------- 入场动画 ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .article-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
  .about-grid { grid-template-columns: 1fr; }
  .about-card { max-width: 420px; margin: 0 auto; }
}

@media (max-width: 720px) {
  .menu-btn { display: inline-flex; }

  .nav-links {
    position: fixed;
    top: 62px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
    padding: 0.8rem 1.25rem 1.2rem;
    background: var(--nav-bg);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border-glow);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
  }

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

  .nav-links a { padding: 0.7rem 1rem; font-size: 1rem; }

  .hero-stats { gap: 1.6rem; }

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

  .markdown-body { padding: 1.4rem 1.2rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}