/* yicode.me — 站点样式表 */

:root {
  --bg: #fdfdfc;
  --bg-soft: #f4f4f1;
  --bg-code: #f6f6f3;
  --fg: #23241f;
  --fg-muted: #6b6d63;
  --fg-faint: #90928a;
  --accent: #0f6f68;
  --accent-hover: #0a4f4a;
  --border: #e3e3dd;
  --border-strong: #cfcfc7;
  --mark: #fff3bf;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;
  --measure: 46rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --bg-soft: #1e2024;
    --bg-code: #1c1e22;
    --fg: #dcdcd6;
    --fg-muted: #9a9d96;
    --fg-faint: #74776f;
    --accent: #5ec8bd;
    --accent-hover: #8adcd3;
    --border: #2b2e33;
    --border-strong: #3b3f45;
    --mark: #4a4327;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- 页头 ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1.6rem 0 1.4rem;
  margin-bottom: 2.5rem;
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem 1.6rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 1.18rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  color: var(--fg);
  text-decoration: none;
  margin-right: auto;
}

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

.brand svg {
  display: block;
  flex: none;
}

.nav {
  display: flex;
  gap: 1.15rem;
  font-size: 0.94rem;
}

.nav a {
  color: var(--fg-muted);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}

.nav a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.nav a[aria-current="page"] {
  color: var(--fg);
  border-bottom-color: var(--border-strong);
}

/* ---------- 通用排版 ---------- */

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--border-strong);
}

a:hover {
  color: var(--accent-hover);
  border-bottom-color: var(--accent-hover);
}

h1,
h2,
h3,
h4 {
  line-height: 1.35;
  letter-spacing: -0.015em;
  font-weight: 650;
  color: var(--fg);
}

h1 {
  font-size: 1.85rem;
  margin: 0 0 0.6rem;
}

h2 {
  font-size: 1.28rem;
  margin: 2.4rem 0 0.9rem;
  padding-top: 0.2rem;
}

h3 {
  font-size: 1.08rem;
  margin: 1.9rem 0 0.7rem;
}

p {
  margin: 0 0 1.1rem;
}

ul,
ol {
  margin: 0 0 1.15rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.4rem;
}

li > ul,
li > ol {
  margin-top: 0.4rem;
  margin-bottom: 0.4rem;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

strong {
  font-weight: 650;
}

mark {
  background: var(--mark);
  color: inherit;
  padding: 0 0.15em;
  border-radius: 2px;
}

blockquote {
  margin: 1.4rem 0;
  padding: 0.2rem 0 0.2rem 1.1rem;
  border-left: 3px solid var(--border-strong);
  color: var(--fg-muted);
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* ---------- 代码 ---------- */

code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.35em;
  word-break: break-word;
}

pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.95rem 1.1rem;
  margin: 0 0 1.3rem;
  overflow-x: auto;
  line-height: 1.6;
  -webkit-overflow-scrolling: touch;
}

pre code {
  display: block;
  background: none;
  border: 0;
  border-radius: 0;
  padding: 0;
  font-size: 0.845rem;
  white-space: pre;
  word-break: normal;
  color: var(--fg);
}

.table-wrap {
  overflow-x: auto;
  margin: 0 0 1.3rem;
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.92rem;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.45rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--bg-soft);
  font-weight: 650;
}

/* ---------- 首页 ---------- */

.intro {
  margin-bottom: 2.8rem;
}

.intro h1 {
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
}

.intro p {
  color: var(--fg-muted);
  margin-bottom: 0.7rem;
}

.intro p:last-child {
  margin-bottom: 0;
}

.section-label {
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin: 0 0 1.4rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list > li {
  margin: 0 0 2.1rem;
}

.post-list h2 {
  font-size: 1.12rem;
  margin: 0 0 0.3rem;
  line-height: 1.45;
}

.post-list h2 a {
  color: var(--fg);
  border-bottom: 0;
}

.post-list h2 a:hover {
  color: var(--accent);
}

.post-list p {
  margin: 0.35rem 0 0;
  color: var(--fg-muted);
  font-size: 0.95rem;
}

.meta {
  font-size: 0.83rem;
  color: var(--fg-faint);
  font-variant-numeric: tabular-nums;
}

.meta .dot {
  padding: 0 0.45rem;
  opacity: 0.6;
}

.tags {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  vertical-align: middle;
}

.tag {
  display: inline-block;
  font-size: 0.74rem;
  line-height: 1.6;
  padding: 0 0.45rem;
  border: 1px solid var(--border-strong);
  border-radius: 3px;
  color: var(--fg-muted);
  white-space: nowrap;
}

/* ---------- 归档 ---------- */

.year-group {
  margin-bottom: 2.4rem;
}

.year-group h2 {
  font-size: 1.05rem;
  margin: 0 0 0.9rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
  color: var(--fg-muted);
  font-variant-numeric: tabular-nums;
}

.archive-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.archive-list li {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: 0.35rem 0;
  margin: 0;
}

.archive-list .date {
  flex: none;
  width: 3.6rem;
  font-size: 0.83rem;
  color: var(--fg-faint);
  font-variant-numeric: tabular-nums;
}

.archive-list a {
  color: var(--fg);
  border-bottom: 0;
}

.archive-list a:hover {
  color: var(--accent);
}

/* ---------- 文章页 ---------- */

.post-header {
  margin-bottom: 2.2rem;
  padding-bottom: 1.3rem;
  border-bottom: 1px solid var(--border);
}

.post-header h1 {
  font-size: 1.72rem;
  margin-bottom: 0.55rem;
}

.post-body > *:first-child {
  margin-top: 0;
}

.post-body h2:first-of-type {
  margin-top: 1.6rem;
}

.post-body img,
.post-body svg {
  max-width: 100%;
  height: auto;
}

.figure {
  margin: 1.6rem 0;
  padding: 1.1rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow-x: auto;
}

.figure figcaption {
  margin-top: 0.7rem;
  font-size: 0.85rem;
  color: var(--fg-faint);
  text-align: center;
}

.note {
  margin: 1.5rem 0;
  padding: 0.85rem 1.05rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 5px 5px 0;
  font-size: 0.94rem;
  color: var(--fg-muted);
}

.note p:last-child {
  margin-bottom: 0;
}

.post-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--border);
  font-size: 0.92rem;
}

.post-nav a {
  max-width: 20rem;
  border-bottom: 0;
}

.post-nav .label {
  display: block;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 0.15rem;
}

.post-nav .next {
  text-align: right;
  margin-left: auto;
}

.back-home {
  margin: 1.5rem 0 0;
  font-size: 0.9rem;
  color: var(--fg-muted);
}

.back-home a {
  border-bottom: 0;
  color: var(--fg-muted);
}

.back-home a:hover {
  color: var(--accent);
}

/* ---------- 404 ---------- */

.notfound {
  text-align: center;
  padding: 3rem 0 2rem;
}

.notfound .code {
  font-family: var(--font-mono);
  font-size: 3.4rem;
  font-weight: 650;
  letter-spacing: -0.03em;
  color: var(--fg-faint);
  line-height: 1;
  margin-bottom: 1rem;
}

.notfound p {
  color: var(--fg-muted);
}

/* ---------- 页脚 ---------- */

.site-footer {
  margin-top: 4rem;
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--fg-faint);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
  justify-content: space-between;
}

.site-footer a {
  color: var(--fg-muted);
  border-bottom: 0;
}

.site-footer a:hover {
  color: var(--accent);
}

.to-top {
  border-bottom: 0;
}

/* ---------- 小屏 ---------- */

@media (max-width: 640px) {
  body {
    font-size: 16px;
    line-height: 1.72;
  }

  .site-header {
    padding: 1.2rem 0 1rem;
    margin-bottom: 1.9rem;
  }

  h1,
  .post-header h1 {
    font-size: 1.45rem;
  }

  h2 {
    font-size: 1.17rem;
  }

  .nav {
    gap: 0.95rem;
    font-size: 0.9rem;
  }

  pre {
    padding: 0.8rem 0.85rem;
    border-radius: 5px;
  }

  pre code {
    font-size: 0.8rem;
  }

  .archive-list li {
    gap: 0.75rem;
  }

  .post-nav .next {
    text-align: left;
  }
}

@media print {
  .site-header .nav,
  .post-nav,
  .site-footer {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }
}