/* ===== 变量：深色为默认，浅色通过 [data-theme="light"] 覆盖 ===== */
:root {
  --bg: #070912;
  --bg-2: #0c1020;
  --text: #e9ebf5;
  --text-dim: #9aa2c0;
  --accent: #5b8cff;
  --accent-2: #9b6bff;
  --accent-3: #36e0c8;
  --glass: rgba(255, 255, 255, 0.06);
  --glass-strong: rgba(255, 255, 255, 0.1);
  --border: rgba(255, 255, 255, 0.14);
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
  --radius: 22px;
  --maxw: 1100px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Noto Sans SC", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

[data-theme="light"] {
  --bg: #eef1fb;
  --bg-2: #e6ebf8;
  --text: #161a2c;
  --text-dim: #555c78;
  --glass: rgba(255, 255, 255, 0.55);
  --glass-strong: rgba(255, 255, 255, 0.72);
  --border: rgba(255, 255, 255, 0.8);
  --shadow: 0 10px 40px rgba(70, 90, 170, 0.14);
}

/* ===== 基础 ===== */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font);
  line-height: 1.75;
  font-size: 16px;
  transition: background 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}
a { color: inherit; }
img { max-width: 100%; }
::selection { background: var(--accent); color: #fff; }

/* ===== 极光背景 ===== */
.aurora {
  position: fixed;
  inset: -20% -10%;
  z-index: -1;
  pointer-events: none;
  filter: blur(70px);
  opacity: 0.85;
  transition: opacity 0.4s ease;
}
[data-theme="light"] .aurora { opacity: 0.5; }
.blob { position: absolute; border-radius: 50%; }
.b1 {
  width: 46vw; height: 46vw; left: -8vw; top: -12vw;
  background: radial-gradient(circle, var(--accent), transparent 70%);
  animation: float1 18s ease-in-out infinite;
}
.b2 {
  width: 42vw; height: 42vw; right: -6vw; top: 8vh;
  background: radial-gradient(circle, var(--accent-2), transparent 70%);
  animation: float2 22s ease-in-out infinite;
}
.b3 {
  width: 38vw; height: 38vw; left: 28vw; bottom: -18vw;
  background: radial-gradient(circle, var(--accent-3), transparent 70%);
  animation: float3 20s ease-in-out infinite;
}
@keyframes float1 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(6vw,4vh); } }
@keyframes float2 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(-5vw,5vh); } }
@keyframes float3 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(4vw,-5vh); } }

/* ===== 玻璃工具类 ===== */
.glass {
  background: var(--glass);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ===== 容器 ===== */
.container { max-width: var(--maxw); margin: 0 auto; padding: 32px 20px 80px; }

/* ===== 头部导航 ===== */
.site-header {
  position: sticky; top: 14px; z-index: 50;
  max-width: var(--maxw); margin: 14px auto 0;
}
.nav-inner {
  display: flex; align-items: center; gap: 14px;
  padding: 10px 18px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; text-decoration: none; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 16px rgba(91, 140, 255, 0.5);
}
.nav-links { display: flex; gap: 4px; margin-left: 6px; flex-wrap: wrap; }
.nav-links a {
  padding: 8px 12px; border-radius: 10px;
  color: var(--text-dim); text-decoration: none; transition: 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--glass-strong); }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.social-mini { display: flex; gap: 6px; }

.icon-btn, .social-btn {
  width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: 50%; background: var(--glass); border: 1px solid var(--border);
  color: var(--text); text-decoration: none; cursor: pointer; transition: 0.2s;
}
.social-btn { width: 34px; height: 34px; }
.icon-btn:hover, .social-btn:hover { transform: translateY(-2px); border-color: var(--accent); color: var(--accent); }
.social-btn .mono { font-size: 0.78rem; font-weight: 700; }
.i-moon { display: none; }
[data-theme="light"] .i-sun { display: none; }
[data-theme="light"] .i-moon { display: block; }

/* ===== 首页 Hero ===== */
.hero { padding: 56px 32px; text-align: center; margin-bottom: 40px; }
.hero-avatar img, .avatar-fallback {
  width: 120px; height: 120px; border-radius: 32px; margin: 0 auto 22px;
  box-shadow: 0 12px 40px rgba(91, 140, 255, 0.35);
}
.avatar-fallback {
  display: flex; align-items: center; justify-content: center;
  font-size: 52px; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.hero-name { font-size: 2.4rem; margin: 0 0 6px; letter-spacing: 0.5px; }
.hero-sub { color: var(--accent); font-size: 1.1rem; margin: 0; font-weight: 600; }
.hero-bio { color: var(--text-dim); max-width: 560px; margin: 14px auto 0; }
.hero-social { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 24px; }

.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: 999px;
  background: var(--glass); border: 1px solid var(--border);
  color: var(--text); text-decoration: none; transition: 0.2s;
}
.pill:hover { transform: translateY(-2px); border-color: var(--accent); color: var(--accent); }
.pill.ghost { background: transparent; }

/* ===== 区块 ===== */
.section { margin-bottom: 44px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 18px; gap: 12px; }
.section-title { font-size: 1.5rem; margin: 0; position: relative; padding-left: 14px; }
.section-title::before {
  content: ""; position: absolute; left: 0; top: 7px; bottom: 7px; width: 4px; border-radius: 4px;
  background: linear-gradient(var(--accent), var(--accent-2));
}
.more-link { color: var(--text-dim); text-decoration: none; white-space: nowrap; }
.more-link:hover { color: var(--accent); }

/* ===== 卡片网格 ===== */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }
.post-card { padding: 22px; display: flex; flex-direction: column; gap: 12px; transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s; }
.post-card:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: 0 18px 50px rgba(91, 140, 255, 0.25); }
.post-card-top { display: flex; align-items: center; gap: 10px; font-size: 0.85rem; color: var(--text-dim); flex-wrap: wrap; }
.tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag-chip {
  padding: 3px 10px; border-radius: 999px;
  background: var(--glass-strong); border: 1px solid var(--border);
  color: var(--accent); text-decoration: none; font-size: 0.8rem; transition: 0.2s;
}
.tag-chip:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.post-title { font-size: 1.2rem; margin: 0; }
.post-title a { color: var(--text); text-decoration: none; transition: 0.2s; }
.post-title a:hover { color: var(--accent); }
.post-summary { color: var(--text-dim); font-size: 0.92rem; margin: 0; flex: 1; }
.post-card-foot { font-size: 0.82rem; color: var(--text-dim); }

/* ===== 单篇文章 / 页面 ===== */
.single { padding: 40px; }
.single-head { border-bottom: 1px solid var(--border); padding-bottom: 20px; margin-bottom: 26px; }
.single-meta { display: flex; gap: 12px; color: var(--text-dim); font-size: 0.85rem; flex-wrap: wrap; margin-bottom: 12px; }
.single-title { font-size: 2rem; margin: 0; line-height: 1.3; }
.single-desc { color: var(--text-dim); margin: 10px 0 0; }
.single-content { font-size: 1.02rem; }
.single-content img { border-radius: 14px; margin: 16px 0; box-shadow: var(--shadow); }
.single-content h2 { margin-top: 32px; position: relative; padding-left: 14px; }
.single-content h2::before {
  content: ""; position: absolute; left: 0; top: 6px; bottom: 6px; width: 4px; border-radius: 4px;
  background: linear-gradient(var(--accent), var(--accent-2));
}
.single-content a { color: var(--accent); }
.single-content pre {
  background: rgba(0, 0, 0, 0.35); padding: 16px; border-radius: 12px;
  overflow: auto; border: 1px solid var(--border); font-size: 0.9rem;
}
.single-content code { background: var(--glass-strong); padding: 2px 6px; border-radius: 6px; font-size: 0.9em; }
.single-content blockquote {
  margin: 16px 0; padding: 10px 18px; border-left: 4px solid var(--accent);
  background: var(--glass); border-radius: 0 12px 12px 0; color: var(--text-dim);
}
.single-foot { margin-top: 30px; }

/* ===== 标签云 ===== */
.tags-cloud { display: flex; gap: 12px; flex-wrap: wrap; }
.tag-cloud-item { display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px; text-decoration: none; color: var(--text); transition: 0.2s; }
.tag-cloud-item:hover { transform: translateY(-2px); border-color: var(--accent); }
.tag-count { background: var(--accent); color: #fff; border-radius: 999px; padding: 1px 9px; font-size: 0.78rem; }

/* ===== 归档 ===== */
.archive-year-title { font-size: 1.3rem; border-left: 4px solid var(--accent); padding-left: 12px; margin: 22px 0 12px; }
.archive-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.archive-item { display: flex; gap: 14px; padding: 10px 14px; border-radius: 12px; background: var(--glass); border: 1px solid var(--border); transition: 0.2s; }
.archive-item:hover { border-color: var(--accent); }
.archive-item time { color: var(--text-dim); font-variant-numeric: tabular-nums; min-width: 48px; }
.archive-item a { color: var(--text); text-decoration: none; }
.archive-item a:hover { color: var(--accent); }

/* ===== 评论 ===== */
.comments { margin-top: 36px; padding: 26px; }
.comments-title { font-size: 1.3rem; margin: 0 0 8px; }
.comments-hint { color: var(--text-dim); font-size: 0.88rem; margin: 0 0 16px; }

/* ===== 搜索弹窗 ===== */
.search-modal { position: fixed; inset: 0; z-index: 100; display: flex; align-items: flex-start; justify-content: center; padding-top: 12vh; }
.search-modal[hidden] { display: none; }
.search-backdrop { position: absolute; inset: 0; background: rgba(5, 7, 16, 0.6); backdrop-filter: blur(6px); }
.search-box { position: relative; width: min(640px, 92vw); padding: 16px; }
.search-input-wrap { display: flex; align-items: center; gap: 10px; border-bottom: 1px solid var(--border); padding-bottom: 10px; color: var(--text-dim); }
#search-input { flex: 1; background: transparent; border: none; outline: none; color: var(--text); font-size: 1.05rem; padding: 6px; font-family: var(--font); }
.search-results { max-height: 60vh; overflow: auto; margin-top: 12px; display: flex; flex-direction: column; gap: 8px; }
.search-result { padding: 12px 14px; border-radius: 12px; background: var(--glass-strong); border: 1px solid var(--border); text-decoration: none; color: var(--text); transition: 0.2s; }
.search-result:hover { border-color: var(--accent); }
.sr-title { font-weight: 600; }
.sr-summary { color: var(--text-dim); font-size: 0.85rem; margin-top: 2px; }
.sr-tags { color: var(--accent); font-size: 0.78rem; margin-top: 4px; }
.search-empty { color: var(--text-dim); padding: 14px; display: none; }
.search-empty.show { display: block; }

/* ===== 页脚 ===== */
.site-footer { max-width: var(--maxw); margin: 0 auto; padding: 0 20px 40px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; padding: 20px 26px; gap: 16px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-title { font-weight: 700; }
.footer-sub { color: var(--text-dim); font-size: 0.88rem; }
.footer-meta { display: flex; gap: 16px; color: var(--text-dim); font-size: 0.88rem; align-items: center; }
.footer-meta a { color: var(--text-dim); text-decoration: none; }
.footer-meta a:hover { color: var(--accent); }
.footer-note { text-align: center; color: var(--text-dim); font-size: 0.8rem; margin-top: 14px; }

/* ===== 关于页头像 ===== */
.about-avatar { width: 120px; height: 120px; border-radius: 30px; float: left; margin: 0 22px 14px 0; box-shadow: 0 12px 40px rgba(91, 140, 255, 0.35); }

/* ===== 回到顶部 ===== */
.to-top {
  position: fixed; right: 20px; bottom: 20px; width: 44px; height: 44px; border-radius: 50%;
  background: var(--glass); border: 1px solid var(--border); color: var(--text);
  backdrop-filter: blur(12px); cursor: pointer; opacity: 0; pointer-events: none; transition: 0.3s; z-index: 40;
}
.to-top.show { opacity: 1; pointer-events: auto; }

/* ===== 分页 ===== */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 28px; }
.pagination a, .pagination span {
  padding: 8px 14px; border-radius: 10px; background: var(--glass); border: 1px solid var(--border);
  color: var(--text-dim); text-decoration: none; transition: 0.2s;
}
.pagination a:hover { color: var(--text); border-color: var(--accent); }
.pagination .current { color: #fff; background: var(--accent); border-color: var(--accent); }

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .brand-text { display: none; }
  .nav-links { font-size: 0.9rem; }
  .hero { padding: 36px 18px; }
  .hero-name { font-size: 1.9rem; }
  .single { padding: 26px 18px; }
  .single-title { font-size: 1.6rem; }
  .about-avatar { float: none; margin: 0 auto 16px; display: block; }
}

/* ===== 文章互动：点赞 / 收藏 / 转发 ===== */
.interactions {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center;
  margin: 26px 0 6px; padding: 16px 18px; border-radius: var(--radius);
}
.act {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: 999px; cursor: pointer;
  background: var(--glass); border: 1px solid var(--border); color: var(--text);
  font-size: 0.95rem; transition: transform 0.15s ease, border-color 0.2s, background 0.2s, color 0.2s;
}
.act:hover { transform: translateY(-2px); border-color: var(--accent); }
.act svg { transition: 0.2s; }
.act .act-count {
  min-width: 20px; text-align: center; font-variant-numeric: tabular-nums;
  padding: 1px 8px; border-radius: 999px; background: var(--glass-strong); font-size: 0.82rem; color: var(--text-dim);
}
.act-like.on { color: #ff5c8a; border-color: #ff5c8a; }
.act-like.on .ic-heart { fill: #ff5c8a; stroke: #ff5c8a; }
.act-fav.on { color: #ffce4d; border-color: #ffce4d; }
.act-fav.on .ic-star { fill: #ffce4d; stroke: #ffce4d; }
.act:active { transform: scale(0.96); }

.share-wrap { position: relative; }
.share-menu {
  position: absolute; top: calc(100% + 8px); left: 0; z-index: 50;
  display: flex; flex-direction: column; min-width: 160px; padding: 6px;
  border-radius: 14px; border: 1px solid var(--border); box-shadow: var(--shadow);
}
.share-menu[hidden] { display: none; }
.share-menu button {
  display: flex; align-items: center; gap: 10px; width: 100%; text-align: left;
  padding: 10px 12px; border: 0; border-radius: 10px; background: transparent;
  color: var(--text); font-size: 0.92rem; cursor: pointer;
}
.share-menu button:hover { background: var(--glass-strong); }
.sm-ic { font-size: 1rem; }

.badge {
  position: absolute; top: -4px; right: -4px; min-width: 16px; height: 16px; padding: 0 4px;
  border-radius: 999px; background: var(--accent); color: #fff; font-size: 0.68rem;
  display: inline-flex; align-items: center; justify-content: center; line-height: 1;
}

.favorites-modal { position: fixed; inset: 0; z-index: 60; display: flex; align-items: center; justify-content: center; padding: 20px; }
.favorites-modal[hidden] { display: none; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.5); backdrop-filter: blur(4px); }
.modal-card { position: relative; width: min(460px, 100%); max-height: 80vh; overflow: auto; padding: 20px 22px; border-radius: var(--radius); border: 1px solid var(--border); box-shadow: var(--shadow); }
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.modal-head h3 { margin: 0; font-size: 1.15rem; }
.fav-item { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 12px 14px; margin-bottom: 8px; border-radius: 12px; background: var(--glass); border: 1px solid var(--border); color: var(--text); text-decoration: none; transition: 0.2s; }
.fav-item:hover { border-color: var(--accent); }
.fav-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fav-del { border: 0; background: transparent; color: var(--text-dim); cursor: pointer; font-size: 0.9rem; padding: 4px 6px; border-radius: 8px; }
.fav-del:hover { color: #ff5c8a; background: var(--glass-strong); }
.fav-empty { color: var(--text-dim); font-size: 0.9rem; line-height: 1.7; }

@media (max-width: 640px) {
  .interactions { padding: 14px; }
  .act { padding: 9px 13px; font-size: 0.9rem; }
}