/* ===========================
   全局样式 & CSS变量
   =========================== */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #06b6d4;
  --bg: #0f0f13;
  --bg-card: #18181f;
  --bg-card-hover: #1f1f2e;
  --border: #2a2a3a;
  --text: #e2e2f0;
  --text-muted: #9090a8;
  --text-dim: #5a5a72;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --font: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

html { scroll-behavior: smooth; }

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

a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--secondary); }

img { max-width: 100%; display: block; }

/* ===========================
   顶部导航
   =========================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,15,19,0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar .logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar .logo .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: .9rem;
  padding: 6px 14px;
  border-radius: 8px;
  transition: background .2s, color .2s;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--bg-card);
  color: var(--text);
}

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

/* ===========================
   Hero 区域
   =========================== */
.hero {
  position: relative;
  overflow: hidden;
  padding: 96px 24px 80px;
  text-align: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 500px;
  background: radial-gradient(ellipse, rgba(99,102,241,.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(99,102,241,.12);
  border: 1px solid rgba(99,102,241,.3);
  color: var(--primary);
  font-size: .8rem;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 28px;
  letter-spacing: .04em;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  color: #fff;
}

.hero h1 .gradient {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  max-width: 560px;
  margin: 0 auto 36px;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===========================
   按钮
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: 10px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 16px rgba(99,102,241,.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(99,102,241,.5); color:#fff; }

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.btn-outline:hover { background: var(--bg-card); color: var(--text); border-color: var(--text-dim); }

/* ===========================
   统计栏
   =========================== */
.stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  padding: 36px 24px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.stat-item { text-align: center; }

.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: .8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===========================
   主体容器
   =========================== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 64px 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--text-muted);
  font-size: .92rem;
  margin-bottom: 36px;
}

/* ===========================
   标签
   =========================== */
.tag {
  display: inline-block;
  font-size: .72rem;
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: .03em;
}

.tag-purple { background: rgba(99,102,241,.15); color: #a5b4fc; border: 1px solid rgba(99,102,241,.25); }
.tag-cyan   { background: rgba(6,182,212,.15);  color: #67e8f9; border: 1px solid rgba(6,182,212,.25); }
.tag-green  { background: rgba(34,197,94,.15);  color: #86efac; border: 1px solid rgba(34,197,94,.25); }
.tag-amber  { background: rgba(245,158,11,.15); color: #fcd34d; border: 1px solid rgba(245,158,11,.25); }
.tag-rose   { background: rgba(244,63,94,.15);  color: #fda4af; border: 1px solid rgba(244,63,94,.25); }

/* ===========================
   卡片 — 文章列表
   =========================== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color .2s, transform .2s, background .2s;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(99,102,241,.4);
  transform: translateY(-3px);
}

.card-icon {
  font-size: 1.6rem;
  width: 48px; height: 48px;
  background: rgba(99,102,241,.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.card-date { font-size: .78rem; color: var(--text-dim); }

.card h3 { font-size: 1.05rem; font-weight: 700; color: #fff; line-height: 1.4; }
.card h3 a { color: #fff; }
.card h3 a:hover { color: var(--primary); }

.card p { font-size: .88rem; color: var(--text-muted); line-height: 1.65; flex: 1; }

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.read-time { font-size: .78rem; color: var(--text-dim); }

.read-link {
  font-size: .82rem;
  color: var(--primary);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}

.read-link:hover { color: var(--secondary); }

/* ===========================
   精选文章大卡片
   =========================== */
.featured-card {
  background: linear-gradient(135deg, rgba(99,102,241,.08), rgba(6,182,212,.05));
  border: 1px solid rgba(99,102,241,.3);
  border-radius: var(--radius);
  padding: 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

.featured-card .featured-label {
  font-size: .72rem;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.featured-card h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 12px;
}

.featured-card p { color: var(--text-muted); font-size: .9rem; margin-bottom: 24px; }

.featured-img {
  background: linear-gradient(135deg, rgba(99,102,241,.2), rgba(6,182,212,.15));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  min-height: 180px;
}

/* ===========================
   目录侧边栏 (文章页)
   =========================== */
.post-layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 40px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 24px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 84px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.toc-title {
  font-size: .78rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.toc ul { list-style: none; }
.toc li { margin-bottom: 8px; }
.toc a {
  font-size: .82rem;
  color: var(--text-muted);
  display: block;
  padding: 4px 8px;
  border-radius: 6px;
  border-left: 2px solid transparent;
  transition: all .2s;
}
.toc a:hover { color: var(--text); background: rgba(255,255,255,.04); }
.toc a.toc-active { color: var(--primary); border-left-color: var(--primary); background: rgba(99,102,241,.08); }
.toc .toc-h3 { padding-left: 20px; }

/* ===========================
   文章内容
   =========================== */
.post-content h1 { font-size: 2rem; font-weight: 800; color: #fff; margin-bottom: 16px; }
.post-content .post-meta { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 32px; }
.post-content .post-meta span { font-size: .82rem; color: var(--text-dim); }

.prose h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.prose h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin: 28px 0 12px;
}

.prose p { margin-bottom: 18px; color: var(--text); }

.prose ul, .prose ol {
  padding-left: 24px;
  margin-bottom: 18px;
  color: var(--text);
}

.prose li { margin-bottom: 8px; }

.prose strong { color: #fff; font-weight: 700; }

.prose code {
  background: rgba(99,102,241,.12);
  border: 1px solid rgba(99,102,241,.2);
  color: #c4b5fd;
  padding: 2px 7px;
  border-radius: 5px;
  font-size: .85em;
  font-family: 'Fira Code', 'Cascadia Code', monospace;
}

.prose pre {
  background: #0d0d10;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
  overflow-x: auto;
  margin-bottom: 22px;
}

.prose pre code {
  background: none;
  border: none;
  color: #a5b4fc;
  padding: 0;
  font-size: .87rem;
  line-height: 1.75;
}

.prose blockquote {
  border-left: 3px solid var(--primary);
  padding: 12px 20px;
  background: rgba(99,102,241,.06);
  border-radius: 0 8px 8px 0;
  margin: 22px 0;
  color: var(--text-muted);
  font-style: italic;
}

.callout {
  border-radius: 10px;
  padding: 16px 20px;
  margin: 22px 0;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.callout-info { background: rgba(6,182,212,.08); border: 1px solid rgba(6,182,212,.2); }
.callout-warn { background: rgba(245,158,11,.08); border: 1px solid rgba(245,158,11,.2); }
.callout-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }
.callout p { margin: 0; font-size: .88rem; color: var(--text-muted); }

/* ===========================
   分类/标签筛选条
   =========================== */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.filter-btn {
  padding: 6px 16px;
  border-radius: 999px;
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
  transition: all .2s;
}

.filter-btn:hover, .filter-btn.active {
  background: rgba(99,102,241,.15);
  border-color: rgba(99,102,241,.4);
  color: var(--primary);
}

/* ===========================
   关于页
   =========================== */
.about-header {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.8rem;
  flex-shrink: 0;
}

.about-intro h1 { font-size: 1.6rem; font-weight: 800; color: #fff; margin-bottom: 6px; }
.about-intro .sub { color: var(--text-muted); font-size: .9rem; margin-bottom: 16px; }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 40px;
}

.skill-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.skill-icon { font-size: 1.4rem; }
.skill-name { font-size: .9rem; font-weight: 600; color: var(--text); }
.skill-level { font-size: .75rem; color: var(--text-dim); }

.timeline { position: relative; padding-left: 20px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 8px; bottom: 8px;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
  padding-left: 24px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -5px; top: 6px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid var(--bg);
}

.timeline-year { font-size: .78rem; color: var(--primary); font-weight: 700; margin-bottom: 4px; }
.timeline-title { font-size: .95rem; font-weight: 700; color: #fff; }
.timeline-desc { font-size: .85rem; color: var(--text-muted); margin-top: 4px; }

/* ===========================
   页脚
   =========================== */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px;
  text-align: center;
  color: var(--text-dim);
  font-size: .82rem;
}

footer .footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

footer .footer-links a { color: var(--text-muted); font-size: .82rem; }
footer .footer-links a:hover { color: var(--primary); }

/* ===========================
   推荐阅读
   =========================== */
.related-posts {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.related-title {
  font-size: .78rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.related-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: border-color .2s, transform .2s;
  color: var(--text);
}

.related-card:hover {
  border-color: rgba(99,102,241,.4);
  transform: translateY(-2px);
  color: var(--text);
}

.related-tag {
  font-size: .72rem;
  color: var(--primary);
  font-weight: 600;
}

.related-name {
  font-size: .85rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

/* ===========================
   文章导航按钮
   =========================== */
.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

/* ===========================
   备案信息 & 页脚增强
   =========================== */
.beian {
  font-size: .75rem;
  color: var(--text-dim);
  margin-top: 4px;
}

/* ===========================
   手机端汉堡菜单
   =========================== */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 5px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  transition: background .2s;
}

.nav-toggle:hover { background: var(--bg-card); }

/* ===========================
   响应式
   =========================== */
@media (max-width: 768px) {
  .featured-card { grid-template-columns: 1fr; }
  .featured-img { min-height: 120px; }
  .post-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
  .stats { gap: 28px; }
  .hero { padding: 64px 20px 48px; }

  /* 手机导航折叠 */
  .nav-toggle { display: flex; align-items: center; }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(15,15,19,.97);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 12px 16px 20px;
    gap: 4px;
    z-index: 99;
  }

  .nav-links.nav-open { display: flex; }
  .nav-links a { padding: 10px 14px; font-size: .95rem; }

  .related-grid { grid-template-columns: 1fr; }
  .post-nav { flex-direction: column; }
  .post-nav .btn { text-align: center; justify-content: center; }
}

@media (max-width: 480px) {
  .cards-grid { grid-template-columns: 1fr; }
}

/* ===========================
   分页
   =========================== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
}

.page-btn {
  width: 36px; height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .88rem;
  transition: all .2s;
}

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

/* ===========================
   搜索框
   =========================== */
.search-box {
  position: relative;
  margin-bottom: 32px;
}

.search-box input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 16px 12px 44px;
  border-radius: 10px;
  font-size: .9rem;
  outline: none;
  transition: border-color .2s;
  font-family: var(--font);
}

.search-box input::placeholder { color: var(--text-dim); }
.search-box input:focus { border-color: rgba(99,102,241,.5); }

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  font-size: 1rem;
}

/* ===========================
   滚动条
   =========================== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }