/* ==========================
   我的博客 · 全站样式
   纯 CSS，无任何框架依赖
   ========================== */

/* ---------- 设计变量 ---------- */
:root {
  --bg: #fafafa;
  --bg-card: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #555;
  --text-muted: #888;
  --accent: #6c5ce7;
  --accent-hover: #5a4bd1;
  --border: #e8e8e8;
  --shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 6px 24px rgba(108, 92, 231, 0.15);
  --radius: 14px;
}

/* 暗色主题（通过 html[data-theme="dark"] 切换） */
[data-theme="dark"] {
  --bg: #0f0f1a;
  --bg-card: #1a1a2e;
  --text: #eaeaf0;
  --text-secondary: #b0b0c0;
  --text-muted: #707080;
  --accent: #a29bfe;
  --accent-hover: #beb2ff;
  --border: #2a2a40;
  --shadow: 0 2px 16px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 6px 24px rgba(162, 155, 254, 0.2);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  transition: background 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

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

/* ---------- 背景光晕 ---------- */
.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(600px circle at 15% 10%, rgba(108, 92, 231, 0.08), transparent),
    radial-gradient(500px circle at 85% 30%, rgba(0, 206, 201, 0.07), transparent);
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
}
.logo:hover { color: var(--accent); }
.logo-dot { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
}
.nav-links a:hover,
.nav-links a.active { color: var(--accent); }

.theme-toggle {
  border: none;
  background: transparent;
  font-size: 1.15rem;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 8px;
  transition: transform 0.2s;
}
.theme-toggle:hover { transform: scale(1.15) rotate(-10deg); }

/* ---------- Hero 区域 ---------- */
.hero { padding: 72px 0 48px; }

.hero h1 { font-size: 2.2rem; line-height: 1.35; }

.highlight {
  background: linear-gradient(120deg, var(--accent), #00cec9);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin-top: 14px;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.hero-links {
  margin-top: 22px;
  display: flex;
  gap: 18px;
  font-weight: 500;
}

/* ---------- 文章列表 ---------- */
.posts-section { padding-bottom: 80px; }

.section-title {
  font-size: 1.45rem;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-title::before {
  content: "";
  width: 4px;
  height: 22px;
  border-radius: 2px;
  background: linear-gradient(var(--accent), #00cec9);
}

.post-list {
  display: grid;
  gap: 18px;
}

.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.post-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.post-link {
  display: block;
  padding: 24px 26px;
  color: inherit;
}

.post-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.tag-badge {
  padding: 2px 10px;
  border-radius: 999px;
  background: rgba(108, 92, 231, 0.12);
  color: var(--accent);
  font-size: 0.78rem;
}

.post-title { font-size: 1.2rem; margin-bottom: 6px; }
.post-link:hover .post-title { color: var(--accent); }

.post-excerpt {
  color: var(--text-secondary);
  font-size: 0.95rem;
  /* 摘要最多显示两行，超出省略 */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-more {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.88rem;
  color: var(--accent);
  font-weight: 500;
}

/* ---------- 文章内页 ---------- */
.article { padding: 48px 0 80px; }

.article-header { margin-bottom: 36px; }

.article-title {
  font-size: 2rem;
  line-height: 1.35;
  margin-top: 10px;
}

.back-home {
  font-size: 0.9rem;
  color: var(--text-muted);
}
.back-home:hover { color: var(--accent); }

.article-content h2 {
  font-size: 1.4rem;
  margin: 34px 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}

.article-content p { margin: 14px 0; color: var(--text-secondary); }

.article-content code {
  background: rgba(108, 92, 231, 0.1);
  color: var(--accent);
  padding: 2px 7px;
  border-radius: 6px;
  font-size: 0.9em;
  font-family: "JetBrains Mono", Consolas, monospace;
}

.article-content pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 18px 0;
}

.article-content pre code {
  background: none;
  padding: 0;
  color: var(--text);
}

.article-content ul,
.article-content ol { padding-left: 24px; margin: 14px 0; color: var(--text-secondary); }

.article-content blockquote {
  border-left: 4px solid var(--accent);
  background: rgba(108, 92, 231, 0.06);
  padding: 12px 18px;
  border-radius: 0 10px 10px 0;
  margin: 18px 0;
  color: var(--text-secondary);
}

/* ---------- 关于页 ---------- */
.about-page { padding: 56px 0 80px; }

.about-page h1 { font-size: 2rem; margin-bottom: 24px; }

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 16px 0 28px;
}

.skill-list li {
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  box-shadow: var(--shadow);
}

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.footer-note { margin-top: 4px; font-size: 0.82rem; opacity: 0.75; }

/* ---------- 404 页面 ---------- */
.error-page {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.error-code {
  font-size: 6rem;
  font-weight: 800;
  background: linear-gradient(120deg, var(--accent), #00cec9);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.btn {
  display: inline-block;
  margin-top: 18px;
  padding: 10px 28px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 500;
  transition: background 0.2s, transform 0.2s;
}
.btn:hover { background: var(--accent-hover); color: #fff; transform: translateY(-2px); }

/* ---------- 响应式 ---------- */
@media (max-width: 600px) {
  .hero { padding: 52px 0 36px; }
  .hero h1 { font-size: 1.7rem; }
  .article-title { font-size: 1.55rem; }
  .nav-links { gap: 14px; }
}