/*
  blank theme — 视觉增强版
  零外部依赖：字体用系统栈，图标全内联 SVG，动画纯 CSS
*/

/* ============ 主题变量 ============ */
:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --fg: #16181d;
  --fg-strong: #000000;
  --fg-muted: #6b7280;
  --border: #e8eaed;
  --accent: #5b5bd6;
  --accent-2: #d946a8;
  --accent-soft: rgba(91, 91, 214, .10);
  --code-bg: #0d1117;
  --code-fg: #e6edf3;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04);
  --shadow-lg: 0 12px 32px -8px rgba(16, 24, 40, .14);
  --radius: 14px;
  --radius-sm: 9px;
  --grad: linear-gradient(135deg, var(--accent), var(--accent-2));
  --header-h: 62px;
}

:root[data-scheme="dark"],
:root[data-scheme="follow"]:not([data-scheme="light"]) {
  --bg: #0a0b10;
  --bg-soft: #12141c;
  --fg: #e4e7ec;
  --fg-strong: #ffffff;
  --fg-muted: #8b93a7;
  --border: #23262f;
  --accent: #7c7cff;
  --accent-2: #ff6ec7;
  --accent-soft: rgba(124, 124, 255, .14);
  --code-bg: #0d1117;
  --code-fg: #e6edf3;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3);
  --shadow-lg: 0 16px 40px -12px rgba(0, 0, 0, .6);
}

@media (prefers-color-scheme: dark) {
  :root[data-scheme="follow"] {
    --bg: #0a0b10;
    --bg-soft: #12141c;
    --fg: #e4e7ec;
    --fg-strong: #ffffff;
    --fg-muted: #8b93a7;
    --border: #23262f;
    --accent: #7c7cff;
    --accent-2: #ff6ec7;
    --accent-soft: rgba(124, 124, 255, .14);
  }
}

/* ============ 基础 ============ */
* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; transition: color .18s ease; }
a:hover { color: var(--accent-2); }

.container { max-width: 780px; margin: 0 auto; padding: 0 22px; }
.muted { color: var(--fg-muted); }
.small { font-size: 13px; }
.sep { margin: 0 7px; color: var(--fg-muted); }

/* ============ 背景光晕 ============ */
.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(680px 380px at 12% -6%, rgba(124, 124, 255, .16), transparent 70%),
    radial-gradient(560px 340px at 92% 4%, rgba(255, 110, 199, .12), transparent 70%),
    radial-gradient(500px 500px at 50% 110%, rgba(124, 124, 255, .07), transparent 70%);
}

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}

.scroll-progress {
  position: absolute;
  left: 0; bottom: -1px;
  height: 2px;
  width: 0;
  background: var(--grad);
  transition: width .08s linear;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  height: var(--header-h);
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  font-size: 17px;
  color: var(--fg-strong);
  letter-spacing: -.01em;
}
.brand:hover { color: var(--fg-strong); }

.brand-avatar {
  width: 30px; height: 30px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
}

.nav { display: flex; align-items: center; gap: 5px; }
.nav > a {
  color: var(--fg-muted);
  font-size: 14.5px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: background .18s ease, color .18s ease;
}
.nav > a:hover { color: var(--fg-strong); background: var(--bg-soft); }

#theme-toggle {
  display: grid;
  place-items: center;
  width: 32px; height: 32px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--fg-muted);
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, transform .18s ease;
}
#theme-toggle:hover { color: var(--accent); border-color: var(--accent); transform: rotate(-18deg); }
:root[data-scheme="dark"] .icon-sun,
:root[data-scheme="follow"] .icon-sun { display: none; }
:root[data-scheme="light"] .icon-sun { display: block; }
:root[data-scheme="light"] .icon-moon { display: none; }
:root[data-scheme="dark"] .icon-moon,
:root[data-scheme="follow"] .icon-moon { display: block; }

/* ============ 社交图标 ============ */
.social-icons {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0 2px;
  padding: 0;
}

.social-icon {
  display: grid;
  place-items: center;
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  color: var(--fg-muted);
  transition: color .2s ease, background .2s ease, transform .2s ease;
}
.social-icon:hover {
  color: var(--fg-strong);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

/* ============ Hero ============ */
.hero {
  padding: 64px 0 44px;
  text-align: center;
}

/* 渐变描边环：渐变放在外层，靠 padding 露出环边。
   注意别把 mask-composite 那套技巧直接用在 <img> 上——会把图片本体也挖空，只剩一个空环。 */
.hero-avatar-ring {
  display: inline-block;
  padding: 3px;
  border-radius: 50%;
  background: var(--grad);
  margin-bottom: 18px;
  box-shadow: var(--shadow-lg);
}

.hero-avatar {
  display: block;
  width: 78px;
  height: 78px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--bg);
}

.hero-title {
  margin: 0;
  font-size: clamp(30px, 6vw, 44px);
  font-weight: 800;
  letter-spacing: -.025em;
  line-height: 1.2;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-tagline {
  margin: 12px 0 0;
  font-size: 16px;
  color: var(--fg-muted);
}

.hero-typing {
  margin: 10px 0 0;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14.5px;
  color: var(--fg-muted);
  min-height: 1.6em;
}
.typing-caret { color: var(--accent); margin-right: 6px; font-weight: 700; }
.typing-cursor {
  display: inline-block;
  width: 8px;
  margin-left: 2px;
  border-bottom: 2px solid var(--accent);
  animation: blink 1s steps(2, start) infinite;
}
@keyframes blink { to { visibility: hidden; } }

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 24px 0 18px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--fg);
  background: var(--bg);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); border-color: var(--accent); color: var(--fg); }

.btn-primary {
  background: var(--grad);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 16px -4px rgba(124, 124, 255, .55);
}
.btn-primary:hover { color: #fff; box-shadow: 0 8px 24px -6px rgba(124, 124, 255, .7); }

.hero .social-icons { justify-content: center; }
.hero .social-icon { width: 36px; height: 36px; }

/* ============ 区块标题 ============ */
.section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 8px 0 20px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--fg-muted);
  text-transform: uppercase;
}
.section-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border), transparent);
}

/* ============ 文章列表 ============ */
.post-list { list-style: none; margin: 0; padding: 0; }

.post-item {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s cubic-bezier(.22, 1, .36, 1);
}
.post-item.in { opacity: 1; transform: none; }

.post-link {
  display: grid;
  grid-template-columns: 52px 1fr 22px;
  align-items: start;
  gap: 14px;
  padding: 18px 18px;
  margin-bottom: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
  color: inherit;
  transition: transform .22s cubic-bezier(.22, 1, .36, 1),
              box-shadow .22s ease, border-color .22s ease, background .22s ease;
}
.post-link:hover {
  color: inherit;
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  background: var(--bg);
}

.post-date {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  color: var(--fg-muted);
  padding-top: 4px;
}

.post-body { min-width: 0; }

.post-title {
  margin: 0;
  font-size: 17.5px;
  font-weight: 650;
  line-height: 1.45;
  letter-spacing: -.01em;
  color: var(--fg-strong);
}
.post-link:hover .post-title { color: var(--accent); }

.post-summary {
  margin: 5px 0 0;
  font-size: 14.5px;
  color: var(--fg-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-meta { margin-top: 7px; font-size: 12.5px; color: var(--fg-muted); }

.post-arrow {
  font-size: 17px;
  color: var(--fg-muted);
  padding-top: 2px;
  transition: transform .22s ease, color .22s ease;
}
.post-link:hover .post-arrow { transform: translateX(4px); color: var(--accent); }

.tag {
  display: inline-block;
  margin-right: 5px;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12px;
}

/* ============ 文章正文 ============ */
.post { padding: 40px 0 48px; }

.post-head { margin-bottom: 28px; }
.post-head h1 {
  margin: 0 0 12px;
  font-size: clamp(26px, 5vw, 34px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.022em;
  color: var(--fg-strong);
}
.post-head .post-meta { font-size: 13.5px; }

.post-content h2 {
  margin: 40px 0 14px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.015em;
  color: var(--fg-strong);
  scroll-margin-top: 80px;
}
.post-content h2::before {
  content: "";
  display: inline-block;
  width: 3px; height: 17px;
  margin-right: 10px;
  vertical-align: -2px;
  border-radius: 2px;
  background: var(--grad);
}
.post-content h3 { margin: 30px 0 11px; font-size: 18.5px; font-weight: 650; color: var(--fg-strong); }
.post-content h4 { margin: 24px 0 8px; font-size: 16px; font-weight: 650; }

.post-content p { margin: 15px 0; }
.post-content ul, .post-content ol { padding-left: 24px; }
.post-content li { margin: 5px 0; }
.post-content li::marker { color: var(--accent); }

.post-content blockquote {
  margin: 20px 0;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  color: var(--fg);
}
.post-content blockquote p { margin: 0; }
.post-content blockquote p + p { margin-top: 8px; }

.post-content img {
  max-width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.post-content hr {
  margin: 36px 0;
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}

.post-content table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 20px 0;
  font-size: 14.5px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.post-content th {
  background: var(--bg-soft);
  font-weight: 600;
  text-align: left;
}
.post-content th, .post-content td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--border);
}
.post-content tr:last-child td { border-bottom: none; }

/* 行内代码 */
.post-content code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 5px;
  padding: .12em .4em;
  font-size: .885em;
}

/* 代码块 */
.code-block { position: relative; margin: 20px 0; }

.post-content pre {
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 15px 17px;
  overflow-x: auto;
  line-height: 1.65;
  margin: 0;
  font-size: 14px;
}
.post-content pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

.code-copy {
  position: absolute;
  top: 8px; right: 8px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 9px;
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 7px;
  background: rgba(255, 255, 255, .06);
  color: #b9c1cc;
  font-size: 12px;
  cursor: pointer;
  opacity: 0;
  transition: opacity .18s ease, color .18s ease, background .18s ease;
}
.code-block:hover .code-copy,
.code-copy:focus-visible { opacity: 1; }
.code-copy:hover { color: #fff; background: rgba(255, 255, 255, .13); }
.code-copy.copied { color: #56d364; border-color: rgba(86, 211, 100, .4); }

/* ============ 目录 ============ */
.toc {
  position: sticky;
  top: calc(var(--header-h) + 12px);
  float: right;
  max-width: 220px;
  margin: 0 0 16px 20px;
  padding: 12px 15px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13.5px;
}
.toc summary { cursor: pointer; font-weight: 600; color: var(--fg-strong); }
.toc nav ul { margin: 8px 0 0; padding-left: 16px; }
.toc ul ul { margin: 0; }
.toc a { color: var(--fg-muted); }
.toc a:hover { color: var(--accent); }

/* ============ 标签云 ============ */
.tag-cloud { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.tag-cloud a {
  display: inline-block;
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 14px;
  background: var(--bg-soft);
  transition: transform .18s ease, border-color .18s ease, color .18s ease;
}
.tag-cloud a:hover { transform: translateY(-2px); border-color: var(--accent); }

.page-title {
  margin: 40px 0 20px;
  font-size: clamp(24px, 4.5vw, 30px);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--fg-strong);
}

/* ============ 分页 / 上下篇 ============ */
.pager {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 28px 0 8px;
}

.post-foot {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 14.5px;
}

/* ============ Footer ============ */
.site-footer {
  margin-top: 56px;
  border-top: 1px solid var(--border);
  padding: 34px 0 48px;
}

.footer-inner { text-align: center; }

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
  text-align: left;
}
.footer-brand p { margin: 0; }
.footer-author { font-weight: 650; color: var(--fg-strong); }

.footer-brand .brand-avatar { width: 42px; height: 42px; }

.site-footer .social-icons { justify-content: center; margin-bottom: 14px; }

.footer-meta { margin: 0 0 4px; }

/* ============ 响应式 ============ */
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .hero { padding: 40px 0 32px; }
  .nav > a { padding: 6px 7px; font-size: 14px; }
  .nav > a:nth-child(-n+3) { display: none; }  /* 窄屏藏掉部分导航，保留图标 */
  .post-link { grid-template-columns: 1fr; gap: 6px; padding: 15px; }
  .post-date { padding-top: 0; font-size: 12px; }
  .post-arrow { display: none; }
  .toc { float: none; max-width: none; margin: 0 0 20px; position: static; }
  .code-copy { opacity: 1; }
}

/* ============ 降低动效偏好 ============ */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .post-item { opacity: 1; transform: none; }
}

/* ============ Chroma 代码高亮 ============ */
.highlight pre { background: var(--code-bg); color: var(--code-fg); }
.hl-c, .hl-cm, .hl-cp, .hl-c1, .hl-ch, .hl-cs, .hl-cd { color: #8b949e; font-style: italic; }
.hl-k, .hl-kc, .hl-kd, .hl-kn, .hl-kp, .hl-kr, .hl-kt { color: #ff7b72; }
.hl-o, .hl-ow { color: #79c0ff; }
.hl-nb, .hl-nx { color: #e6edf3; }
.hl-na { color: #79c0ff; }
.hl-nc, .hl-nd, .hl-nn { color: #ffa657; }
.hl-ne, .hl-nf, .hl-py { color: #d2a8ff; }
.hl-nl, .hl-nv, .hl-vc, .hl-vg, .hl-vi, .hl-vm { color: #ffa657; }
.hl-no { color: #79c0ff; }
.hl-nt { color: #7ee787; }
.hl-s, .hl-s1, .hl-s2, .hl-sa, .hl-sb, .hl-sc, .hl-dl, .hl-sd, .hl-sh { color: #a5d6ff; }
.hl-se, .hl-si, .hl-sx, .hl-sr, .hl-ss { color: #79c0ff; }
.hl-m, .hl-mb, .hl-mf, .hl-mh, .hl-mi, .hl-mo, .hl-il { color: #79c0ff; }
.hl-gd { color: #ffa198; background: #67060c; }
.hl-gi { color: #56d364; background: #033a16; }
.hl-ge { font-style: italic; }
.hl-gs { font-weight: 700; }
.hl-gu { color: #79c0ff; }
.hl-err { color: #f85149; }