/* 博客列表与文章页视觉，复用站点 --brand/--canvas/--surface/--ink/--muted/--line/--radius/--shadow 令牌。 */

.blog-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.blog-page { min-height: 100vh; background: var(--canvas); }
.blog-page-content { min-height: calc(100vh - 76px); }
.blog-topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: 76px;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 78%, transparent);
  background: color-mix(in srgb, var(--canvas) 90%, transparent);
  backdrop-filter: blur(16px);
}
.blog-topbar-inner { display: flex; width: min(1320px, calc(100% - 64px)); height: 100%; align-items: center; gap: 32px; margin: 0 auto; }
.blog-topbar .language-switch { flex: 0 0 auto; }
.blog-brand { display: flex; align-items: center; gap: 10px; margin-right: auto; text-decoration: none; }
.blog-brand img { width: 40px; height: 40px; object-fit: contain; }
.blog-brand span { display: flex; flex-direction: column; line-height: 1.25; }
.blog-brand strong { font-size: .96rem; letter-spacing: -.02em; }
.blog-brand small { margin-top: 2px; color: var(--muted); font-size: .68rem; }
.blog-nav { display: flex; align-items: center; gap: 6px; }
.blog-nav a { padding: 8px 13px; color: var(--muted); border-radius: 7px; font-size: .84rem; font-weight: 600; text-decoration: none; }
.blog-nav a:hover { color: var(--brand); background: var(--surface); }
.blog-nav a.active { color: var(--brand); background: var(--brand-soft); }

.blog-shell { width: min(1320px, 100%); margin: 0 auto; padding: 48px 32px 84px; }

/* ---------- 列表页 ---------- */

.blog-header { max-width: 820px; margin-bottom: 34px; }
.blog-eyebrow { margin-bottom: 8px; color: var(--brand); font-size: .78rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.blog-header h1 { font-size: clamp(2.35rem, 5vw, 4.2rem); line-height: 1.08; letter-spacing: -.055em; }
.blog-intro { max-width: 720px; margin-top: 18px; color: var(--muted); font-size: 1rem; line-height: 1.75; }

.blog-controls {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 14px;
  margin-bottom: 30px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
.blog-search-form { width: 100%; min-width: 0; }
.blog-search-form label { display: block; margin-bottom: 7px; color: var(--ink); font-size: .82rem; font-weight: 650; }
.blog-search-field { display: flex; overflow: hidden; width: 100%; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.blog-search-field input { flex: 1; min-width: 0; padding: 12px 14px; border: 0; background: transparent; outline: 0; font-size: .92rem; }
.blog-search-field input::placeholder { color: var(--subtle); }
.blog-search-field input:focus-visible { outline: 2px solid var(--brand); outline-offset: -2px; }
.blog-search-field button { flex: 0 0 auto; padding: 0 18px; color: white; background: var(--brand); font-size: .84rem; font-weight: 650; cursor: pointer; }
.blog-search-field button:hover { background: var(--brand-hover); }
.blog-search-field button:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

.blog-filter-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.blog-chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  color: var(--muted);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface);
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, background .18s ease;
}
.blog-chip:hover { color: var(--brand); border-color: var(--brand); background: var(--brand-soft); }
.blog-chip:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.blog-chip.active, .blog-chip[aria-pressed="true"] { color: var(--brand); border-color: var(--brand); background: var(--brand-soft); }
.blog-chip-static { padding: 4px 10px; color: var(--brand); border: 0; border-radius: 999px; background: var(--brand-soft); font-size: .72rem; font-weight: 650; cursor: default; }

.blog-result-count { margin-bottom: 16px; color: var(--muted); font-size: .82rem; }
.blog-alert { padding: 12px 16px; margin-bottom: 16px; color: var(--danger); border: 1px solid var(--danger); border-radius: var(--radius); background: color-mix(in srgb, var(--danger) 8%, var(--surface)); font-size: .85rem; }
.blog-empty-state { padding: 48px 20px; color: var(--muted); border: 1px dashed var(--line-strong); border-radius: var(--radius); text-align: center; }
.blog-empty-state strong { display: block; margin-bottom: 6px; color: var(--ink); font-size: 1rem; }

.blog-featured { margin-bottom: 34px; }
.blog-featured .blog-card { grid-template-columns: minmax(0, 44%) 1fr; }
.blog-featured .blog-card-link { display: grid; grid-template-columns: minmax(0, 44%) 1fr; align-items: stretch; }
.blog-featured .blog-card-cover { height: 100%; min-height: 290px; }
.blog-featured .blog-card-title { font-size: clamp(1.35rem, 2.3vw, 2rem); }
.blog-card-badge {
  display: inline-flex;
  align-self: flex-start;
  padding: 3px 10px;
  margin-bottom: 8px;
  color: var(--brand);
  border-radius: 999px;
  background: var(--brand-soft);
  font-size: .7rem;
  font-weight: 700;
}

.blog-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-bottom: 34px; }
.blog-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.blog-card:hover { border-color: var(--brand); box-shadow: 0 10px 26px rgba(15, 23, 42, .07); transform: translateY(-2px); }
.blog-card-link { display: flex; flex-direction: column; height: 100%; color: inherit; text-decoration: none; }
.blog-card-link:focus-visible { outline: 2px solid var(--brand); outline-offset: -2px; }
.blog-card-cover { width: 100%; height: 190px; object-fit: cover; background: var(--surface-soft); }
.blog-card-body { display: flex; flex: 1; flex-direction: column; gap: 9px; padding: 21px 22px 23px; }
.blog-card .blog-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.blog-card-title { font-size: 1.05rem; line-height: 1.4; letter-spacing: -.01em; }
.blog-card-excerpt { display: -webkit-box; flex: 1; overflow: hidden; color: var(--muted); font-size: .84rem; line-height: 1.6; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.blog-card-meta { color: var(--subtle); font-size: .76rem; }

.blog-pagination { display: flex; flex-wrap: wrap; gap: 8px; }
.blog-page-link, .blog-page-current {
  display: inline-flex;
  min-width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-size: .85rem;
  font-weight: 650;
}
.blog-page-link { color: var(--muted); border: 1px solid var(--line-strong); background: var(--surface); text-decoration: none; transition: color .18s ease, border-color .18s ease, background .18s ease; }
.blog-page-link:hover { color: var(--brand); border-color: var(--brand); background: var(--brand-soft); }
.blog-page-link:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.blog-page-current { color: white; border: 1px solid var(--brand); background: var(--brand); }

/* ---------- 文章详情页 ---------- */

.blog-progress { position: fixed; top: 0; left: 0; z-index: 50; width: 100%; height: 3px; background: transparent; pointer-events: none; }
.blog-progress span { display: block; width: 0%; height: 100%; background: var(--brand); transition: width .12s ease-out; }

.blog-post { width: min(1160px, 100%); padding-top: 38px; }
.blog-post-back { margin-bottom: 18px; }
.blog-post-back a { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); font-size: .84rem; font-weight: 600; text-decoration: none; }
.blog-post-back a:hover { color: var(--brand); }
.blog-post-back a:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }

.blog-post-header { max-width: 880px; margin-bottom: 28px; }
.blog-post-header .blog-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.blog-post-header h1 { font-size: clamp(1.85rem, 3.2vw, 2.55rem); line-height: 1.2; letter-spacing: -.03em; }
.blog-post-lede { margin-top: 12px; color: var(--muted); font-size: 1rem; line-height: 1.65; }
.blog-post-meta { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 16px; color: var(--subtle); font-size: .82rem; }
.blog-post-author { color: var(--ink); font-weight: 650; }

.blog-post-cover { overflow: hidden; margin-bottom: 36px; border-radius: 14px; aspect-ratio: 2 / 1; background: var(--surface-soft); }
.blog-post-cover img { width: 100%; height: 100%; object-fit: cover; }

.blog-post-layout { display: grid; grid-template-columns: minmax(0, 760px); gap: 52px; align-items: start; }

.blog-post-content { max-width: 760px; font-size: 1.03rem; line-height: 1.88; }
.blog-post-content h1, .blog-post-content h2, .blog-post-content h3, .blog-post-content h4 { margin: 1.6em 0 .6em; letter-spacing: -.02em; scroll-margin-top: 96px; }
.blog-post-content h1 { font-size: 1.5rem; }
.blog-post-content h2 { font-size: 1.3rem; }
.blog-post-content h3 { font-size: 1.12rem; }
.blog-post-content h4 { font-size: 1rem; }
.blog-post-content p { margin: 1em 0; }
.blog-post-content ul, .blog-post-content ol { margin: 1em 0; padding-left: 1.4em; }
.blog-post-content li + li { margin-top: .35em; }
.blog-post-content li:has(input[type="checkbox"]) { list-style: none; margin-left: -1.4em; }
.blog-post-content a { color: var(--brand); text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--brand) 40%, transparent); }
.blog-post-content a:hover { text-decoration-color: currentColor; }
.blog-post-content img { max-width: 100%; margin: 1.2em 0; border-radius: var(--radius); }
.blog-post-content blockquote { padding: 4px 18px; margin: 1.4em 0; border-left: 3px solid var(--brand); color: var(--muted); }
.blog-post-content hr { margin: 2em 0; border: 0; border-top: 1px solid var(--line); }
.blog-table-wrap { max-width: 100%; margin: 1.4em 0; overflow-x: auto; }
.blog-post-content table { min-width: 100%; margin: 0; border-collapse: collapse; font-size: .9rem; }
.blog-post-content th, .blog-post-content td { padding: 9px 12px; border: 1px solid var(--line); text-align: left; white-space: nowrap; }
.blog-post-content th { background: var(--surface-soft); font-weight: 650; }
.blog-post-content code { padding: .15em .4em; border-radius: 5px; background: var(--surface-soft); font-family: "SFMono-Regular", Consolas, monospace; font-size: .88em; }
.blog-post-content pre code { padding: 0; background: transparent; }

.blog-code { overflow: hidden; margin: 1.4em 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface-soft); }
.blog-code-toolbar { display: flex; align-items: center; justify-content: space-between; padding: 8px 14px; border-bottom: 1px solid var(--line); background: var(--surface); }
.blog-code-lang { color: var(--muted); font-size: .72rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; }
.blog-code-copy {
  padding: 5px 11px;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
  font-size: .74rem;
  font-weight: 650;
  transition: color .18s ease, border-color .18s ease, background .18s ease;
}
.blog-code-copy:hover { color: var(--brand); border-color: var(--brand); background: var(--brand-soft); }
.blog-code-copy:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.blog-code pre { overflow-x: auto; padding: 16px; margin: 0; background: transparent; }
.blog-code code { font-family: "SFMono-Regular", Consolas, monospace; font-size: .86rem; line-height: 1.65; }

/* highlight.js 明暗配色，跟随站点主题变量，不依赖外部 CDN */
.hljs { color: var(--ink); background: transparent; }
.hljs-comment, .hljs-quote { color: var(--subtle); font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal, .hljs-tag { color: var(--brand); }
.hljs-string, .hljs-doctag, .hljs-regexp, .hljs-addition { color: var(--success); }
html[data-theme="dark"] .hljs-string, html[data-theme="dark"] .hljs-doctag, html[data-theme="dark"] .hljs-regexp, html[data-theme="dark"] .hljs-addition { color: #4ade80; }
.hljs-number, .hljs-attribute, .hljs-deletion { color: #c2410c; }
html[data-theme="dark"] .hljs-number, html[data-theme="dark"] .hljs-attribute, html[data-theme="dark"] .hljs-deletion { color: #f0a874; }
.hljs-title, .hljs-name, .hljs-section, .hljs-selector-id { color: #b45309; font-weight: 650; }
html[data-theme="dark"] .hljs-title, html[data-theme="dark"] .hljs-name, html[data-theme="dark"] .hljs-section, html[data-theme="dark"] .hljs-selector-id { color: #f2c185; }
.hljs-type, .hljs-class .hljs-title, .hljs-built_in { color: #6d28d9; }
html[data-theme="dark"] .hljs-type, html[data-theme="dark"] .hljs-class .hljs-title, html[data-theme="dark"] .hljs-built_in { color: #c4b5fd; }
.hljs-variable, .hljs-template-variable, .hljs-attr, .hljs-symbol, .hljs-bullet { color: var(--brand-hover); }
.hljs-meta { color: var(--subtle); }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 700; }

.blog-toc { align-self: start; }
.blog-toc summary { padding: 12px 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); cursor: pointer; font-size: .86rem; font-weight: 650; list-style: none; }
.blog-toc summary::-webkit-details-marker { display: none; }
.blog-toc summary::after { display: inline-block; margin-left: 6px; content: "▾"; }
.blog-toc[open] summary::after { content: "▴"; }
.blog-toc summary:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.blog-toc nav { padding: 6px 16px 14px; border: 1px solid var(--line); border-top: 0; border-radius: 0 0 var(--radius) var(--radius); background: var(--surface); }
.blog-toc ol { margin: 0; padding-left: 0; list-style: none; }
.blog-toc-item { padding: 6px 0; }
.blog-toc-item.blog-toc-level-3 { padding-left: 14px; }
.blog-toc-item a { color: var(--muted); font-size: .84rem; text-decoration: none; }
.blog-toc-item a:hover { color: var(--brand); }
.blog-toc-item a:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }

.blog-post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 760px; margin-top: 48px; }
.blog-post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  text-decoration: none;
  transition: border-color .18s ease, background .18s ease;
}
.blog-post-nav-link:hover { border-color: var(--brand); background: var(--brand-soft); }
.blog-post-nav-link:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.blog-post-nav-next { grid-column: 2; text-align: right; }
.blog-post-nav-empty { border: 0; background: transparent; }
.blog-post-nav-label { color: var(--muted); font-size: .74rem; font-weight: 650; text-transform: uppercase; letter-spacing: .04em; }
.blog-post-nav-title { color: var(--ink); font-size: .92rem; font-weight: 650; }

@media (min-width: 901px) {
  .blog-toc summary { pointer-events: none; }
  .blog-toc summary::after { display: none; }
}

@media (max-width: 900px) {
  .blog-topbar { height: 68px; }
  .blog-topbar-inner { width: calc(100% - 32px); }
  .blog-toc { margin-bottom: 8px; }
  .blog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .blog-shell { padding-top: 26px; }
}

@media (max-width: 720px) {
  .blog-grid { grid-template-columns: 1fr; }
  .blog-featured .blog-card, .blog-featured .blog-card-link { grid-template-columns: 1fr; }
  .blog-featured .blog-card-cover { min-height: 160px; }
  .blog-post-nav { grid-template-columns: 1fr; }
  .blog-post-nav-next { grid-column: 1; text-align: left; }
}

@media (max-width: 560px) {
  .blog-topbar-inner { width: calc(100% - 28px); gap: 10px; }
  .blog-brand small { display: none; }
  .blog-nav { gap: 0; }
  .blog-nav a { padding: 7px 8px; font-size: .76rem; }
  .blog-nav a:first-child { display: none; }
  .blog-topbar .icon-button,
  .blog-topbar .language-switch-trigger {
    width: auto;
    min-width: 34px;
    height: 34px;
  }
  .blog-topbar .icon-button { width: 34px; flex-basis: 34px; }
  .blog-shell { padding: 24px 14px 54px; }
  .blog-header h1 { font-size: 2.05rem; }
  .blog-controls { gap: 12px; }
  .blog-search-form { width: 100%; min-width: 0; }
  .blog-filter-bar { width: 100%; }
  .blog-post-header h1 { font-size: 1.65rem; }
  .blog-grid { grid-template-columns: 1fr; }
}

/* ---------- Josh Comeau-inspired editorial treatment ---------- */

.blog-list-shell { width: 100%; }
.blog-list-hero {
  padding: 72px 32px 108px;
  background: color-mix(in srgb, var(--brand-soft) 74%, #d8f3f0);
}
.blog-list-hero .blog-header { width: min(1240px, 100%); max-width: none; margin: 0 auto; }
.blog-list-hero .blog-header h1 { max-width: 860px; font-size: clamp(2.8rem, 6vw, 5rem); }
.blog-list-hero .blog-intro { max-width: 700px; }
.blog-list-content { margin-top: -52px; padding-top: 0; }
.blog-list-content .blog-controls { box-shadow: 0 18px 48px rgba(15, 23, 42, .09); }

.article-shell .blog-topbar {
  border-bottom-color: transparent;
  background: color-mix(in srgb, var(--brand-soft) 78%, #d8f3f0);
}
.blog-post {
  --blog-inline: 32px;
  --blog-rail: 58px;
  --blog-gap: 36px;
  --blog-measure: 940px;
  --blog-toc: 270px;
  --blog-frame: calc(var(--blog-rail) + var(--blog-gap) + var(--blog-measure) + var(--blog-gap) + var(--blog-toc));
  --blog-columns: var(--blog-rail) minmax(0, var(--blog-measure)) minmax(220px, var(--blog-toc));
  width: 100%;
  padding: 0;
}
.blog-post-hero {
  padding: 42px var(--blog-inline) 96px;
  background: color-mix(in srgb, var(--brand-soft) 78%, #d8f3f0);
}
.blog-post-hero-inner {
  display: grid;
  grid-template-columns: var(--blog-columns);
  gap: var(--blog-gap);
  width: min(var(--blog-frame), 100%);
  margin: 0 auto;
}
.blog-post-hero-inner > * { grid-column: 2; min-width: 0; }
.blog-post-hero .blog-post-back { margin-bottom: 36px; }
.blog-post-hero .blog-post-back a { color: color-mix(in srgb, var(--ink) 64%, var(--brand)); }
.blog-post-header { max-width: none; margin: 0; }
.blog-post-header h1 { font-size: clamp(1.9rem, 3.2vw, 2.6rem); line-height: 1.2; letter-spacing: -.03em; }
.blog-post-lede { max-width: none; margin-top: 20px; color: color-mix(in srgb, var(--ink) 62%, var(--muted)); font-size: 1.14rem; line-height: 1.65; }
.blog-post-meta { margin-top: 26px; color: color-mix(in srgb, var(--ink) 56%, var(--muted)); font-size: .86rem; }
.blog-post-body.blog-shell {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 68px var(--blog-inline) 84px;
}
.blog-post-cover {
  display: grid;
  grid-template-columns: var(--blog-columns);
  gap: var(--blog-gap);
  width: min(var(--blog-frame), 100%);
  max-width: none;
  margin: 0 auto 64px;
  overflow: visible;
  border-radius: 0;
  aspect-ratio: auto;
  background: transparent;
  box-shadow: none;
}
.blog-post-cover img {
  grid-column: 2;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: 18px;
  background: var(--surface-soft);
  box-shadow: 0 22px 70px rgba(15, 23, 42, .1);
}
.blog-post-layout {
  display: grid;
  grid-template-columns: var(--blog-columns);
  gap: var(--blog-gap);
  align-items: start;
  width: min(var(--blog-frame), 100%);
  max-width: none;
  margin: 0 auto;
}
.blog-post-layout > * { min-width: 0; }
.blog-post-content { max-width: none; grid-column: 2; font-size: 1.06rem; line-height: 1.92; }
.blog-post-content > :first-child { margin-top: 0; }
.blog-post-content p { margin: 1.2em 0; }
.blog-post-content h1,
.blog-post-content h2,
.blog-post-content h3,
.blog-post-content h4 { margin-top: 2.25em; margin-bottom: .7em; line-height: 1.3; }
.blog-post-content h2 { font-size: 1.65rem; }
.blog-post-content h3 { font-size: 1.28rem; }
.blog-post-content blockquote {
  padding: 18px 22px;
  border-left: 4px solid var(--brand);
  border-radius: 0 12px 12px 0;
  background: var(--brand-soft);
}
.blog-post-content li + li { margin-top: .62em; }

.blog-share-tools {
  position: sticky;
  top: 104px;
  display: flex;
  grid-column: 1;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.blog-share-label {
  margin-bottom: 2px;
  color: var(--subtle);
  font-size: .66rem;
  font-weight: 760;
  letter-spacing: .12em;
}
.blog-share-button {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease, background .18s ease, transform .18s ease;
}
.blog-share-button:hover,
.blog-share-button.active { color: var(--brand); border-color: var(--brand); background: var(--brand-soft); transform: translateY(-2px); }
.blog-share-button:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; }
.blog-share-button i { font-size: 1.18rem; }

.blog-toc {
  position: sticky;
  top: 102px;
  grid-column: 3;
  align-self: start;
}
.blog-toc summary {
  padding: 0 0 14px;
  color: var(--ink);
  border: 0;
  border-radius: 0;
  background: transparent;
  font-size: .74rem;
  font-weight: 800;
  letter-spacing: .12em;
}
.blog-toc summary::after { display: none; }
.blog-toc nav { padding: 2px 0 2px 18px; border: 0; border-left: 2px solid var(--line); border-radius: 0; background: transparent; }
.blog-toc-item { padding: 5px 0; }
.blog-toc-item.blog-toc-level-3 { padding-left: 12px; }
.blog-toc-item a { font-size: .8rem; line-height: 1.45; }
.blog-post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  width: min(var(--blog-frame), 100%);
  max-width: none;
  margin: 54px auto 0;
  padding-left: calc(var(--blog-rail) + var(--blog-gap));
  padding-right: calc(var(--blog-toc) + var(--blog-gap));
  box-sizing: border-box;
}

@media (max-width: 1060px) {
  .blog-post {
    --blog-rail: 52px;
    --blog-gap: 26px;
    --blog-toc: 220px;
    --blog-columns: var(--blog-rail) minmax(0, 1fr) var(--blog-toc);
    --blog-frame: 100%;
  }
}

@media (max-width: 900px) {
  .blog-list-hero { padding: 54px 24px 86px; }
  .blog-post {
    --blog-inline: 24px;
    --blog-rail: 0px;
    --blog-gap: 24px;
    --blog-measure: 940px;
    --blog-toc: 0px;
    --blog-columns: minmax(0, 1fr);
    --blog-frame: min(var(--blog-measure), 100%);
  }
  .blog-post-hero { padding: 34px var(--blog-inline) 72px; }
  .blog-post-hero-inner > * { grid-column: 1; }
  .blog-post-body.blog-shell { padding-top: 44px; }
  .blog-post-cover img { grid-column: 1; }
  .blog-share-tools {
    position: static;
    grid-column: 1;
    flex-direction: row;
    justify-content: flex-start;
    order: 1;
  }
  .blog-share-label { margin: 0 4px 0 0; }
  .blog-toc { position: static; grid-column: 1; order: 2; margin: 0; }
  .blog-toc summary {
    padding: 13px 16px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--surface);
    letter-spacing: .04em;
  }
  .blog-toc summary::after { display: inline-block; }
  .blog-toc nav { padding: 8px 16px 12px; border: 1px solid var(--line); border-top: 0; border-radius: 0 0 10px 10px; background: var(--surface); }
  .blog-post-content { grid-column: 1; order: 3; }
  .blog-post-nav {
    margin-top: 46px;
    padding-left: 0;
    padding-right: 0;
  }
}

@media (max-width: 560px) {
  .blog-list-hero { padding: 38px 14px 72px; }
  .blog-list-hero .blog-header h1 { font-size: 2.45rem; }
  .blog-list-content { margin-top: -38px; }
  .blog-post { --blog-inline: 14px; --blog-gap: 20px; }
  .blog-post-hero { padding: 24px var(--blog-inline) 66px; }
  .blog-post-hero .blog-post-back { margin-bottom: 28px; }
  .blog-post-header h1 { font-size: 1.75rem; line-height: 1.22; }
  .blog-post-lede { font-size: .98rem; }
  .blog-post-meta { gap: 5px; margin-top: 20px; font-size: .76rem; }
  .blog-post-body.blog-shell { padding: 34px var(--blog-inline) 54px; }
  .blog-post-cover { margin-bottom: 36px; }
  .blog-post-cover img { border-radius: 12px; aspect-ratio: 16 / 10; }
  .blog-share-button { width: 40px; height: 40px; }
  .blog-post-content { font-size: .98rem; line-height: 1.82; }
  .blog-post-content h2 { font-size: 1.42rem; }
}

:root {
  --canvas: #f8faf9;
  --surface: #ffffff;
  --surface-soft: #f5f8f7;
  --ink: #111827;
  --muted: #667085;
  --subtle: #98a2b3;
  --line: #e2e8e6;
  --line-strong: #d3ddda;
  --brand: #07877f;
  --brand-hover: #066f69;
  --brand-soft: #e9f6f4;
  --danger: #dc2626;
  --success: #07875f;
  --sidebar-width: 312px;
  --radius: 9px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .025);
}

html[data-theme="dark"] {
  --canvas: #111817;
  --surface: #17201f;
  --surface-soft: #1b2624;
  --ink: #f4f7f6;
  --muted: #a7b4b1;
  --subtle: #7f908c;
  --line: #2a3835;
  --line-strong: #354743;
  --brand: #2bb3a8;
  --brand-hover: #45c8bd;
  --brand-soft: #173a36;
  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  min-width: 320px;
  color: var(--ink);
  background: var(--canvas);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
button, input, textarea, select { color: inherit; font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { border: 0; }
a { color: inherit; }
[hidden] { display: none !important; }

.layout-container, .tool-layout { min-height: 100vh; }
.main-content, .tool-content {
  display: flex;
  min-height: 100vh;
  margin-left: var(--sidebar-width);
  flex-direction: column;
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 40;
  display: flex;
  width: var(--sidebar-width);
  flex-direction: column;
  overflow-x: hidden;
  overflow-y: auto;
  background: var(--surface);
  border-right: 1px solid var(--line);
}
.sidebar-header { padding: 28px 22px 25px; }
.brand-link { display: flex; min-width: 0; align-items: center; gap: 13px; text-decoration: none; }
.brand-mark { width: 48px; height: 48px; flex: 0 0 48px; object-fit: contain; }
.brand-copy { display: flex; min-width: 0; flex: 1; flex-direction: column; }
.brand-copy strong { color: var(--ink); font-size: 1.18rem; font-weight: 760; letter-spacing: -.025em; }
.brand-copy small {
  display: -webkit-box;
  overflow: hidden;
  color: var(--muted);
  font-size: .76rem;
  line-height: 1.35;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.sidebar-nav { padding: 4px 18px 18px; min-width: 0; }
.nav-overview, .nav-category-link, .quick-nav a, .sidebar-about {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  min-height: 46px;
  padding: 0 12px;
  color: #344054;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 580;
  text-decoration: none;
  transition: color .18s ease, background .18s ease;
}
html[data-theme="dark"] .nav-overview,
html[data-theme="dark"] .nav-category-link,
html[data-theme="dark"] .quick-nav a,
html[data-theme="dark"] .sidebar-about { color: #c4d0cd; }
.nav-overview i, .nav-category-link i, .quick-nav a i, .sidebar-about i,
.nav-overview .icon-svg, .nav-category-link .icon-svg, .quick-nav a .icon-svg, .sidebar-about .icon-svg {
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
}
.nav-overview i, .nav-category-link i, .quick-nav a i, .sidebar-about i { font-size: 1.28rem; }
.nav-links .icon-svg {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  color: inherit;
  vertical-align: -0.15em;
}
.nav-overview span { flex: 1; }
.nav-overview b, .nav-category-link span {
  min-width: 24px;
  padding: 2px 6px;
  color: var(--brand);
  border-radius: 6px;
  background: rgba(7, 135, 127, .08);
  font-size: .7rem;
  font-weight: 700;
  text-align: center;
}
.nav-overview:hover, .nav-category-link:hover, .quick-nav a:hover, .sidebar-about:hover { color: var(--brand); background: var(--surface-soft); }
.nav-overview.active, .nav-overview[data-category-filter].active, .nav-category-link.active, .quick-nav a.active {
  color: var(--brand);
  background: var(--brand-soft);
}
.nav-category { margin-top: 7px; }
.nav-category-link span { margin-left: auto; color: var(--muted); background: var(--surface-soft); }
.nav-category.active .nav-category-link { color: var(--brand); background: var(--brand-soft); }
.nav-links { display: none; }
.quick-nav { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--line); }
.quick-nav h3 { margin: 0 10px 8px; color: var(--muted); font-size: .76rem; font-weight: 650; }

.sidebar-tip {
  display: flex;
  gap: 10px;
  margin: auto 20px 18px;
  padding: 16px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface-soft);
  font-size: .75rem;
}
.sidebar-tip > i { color: var(--brand); font-size: 1.2rem; }
.sidebar-tip strong { display: block; margin-bottom: 4px; color: var(--ink); font-size: .82rem; }
.sidebar-tip p { margin-bottom: 10px; }
kbd { padding: 3px 7px; color: var(--muted); border: 1px solid var(--line-strong); border-radius: 5px; background: var(--surface); box-shadow: 0 1px 0 var(--line); font-size: .7rem; }
.sidebar-about { margin: 0 20px 18px; padding-top: 10px; border-top: 1px solid var(--line); border-radius: 0; font-size: .8rem; }
.sidebar-overlay { display: none; }

.app-topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  height: 76px;
  align-items: center;
  gap: 12px;
  padding: 0 42px;
  background: color-mix(in srgb, var(--canvas) 88%, transparent);
  backdrop-filter: blur(14px);
}
.topbar-spacer { flex: 1; }
.topbar-tool-search {
  position: relative;
  display: flex;
  width: min(560px, calc(100% - 180px));
  height: 44px;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.topbar-tool-search:focus-within { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(7, 135, 127, .1); }
.topbar-tool-search > i { color: var(--muted); font-size: 1.2rem; }
.topbar-tool-search > input { min-width: 0; flex: 1; border: 0; outline: 0; background: transparent; font-size: .88rem; }
.topbar-tool-search > input::placeholder { color: var(--subtle); }
.topbar-tool-search > kbd { margin-left: auto; }
.topbar-search-results {
  position: absolute;
  top: calc(100% + 9px);
  left: 0;
  z-index: 45;
  width: min(560px, 88vw);
  max-height: 420px;
  padding: 8px;
  overflow-y: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: 0 18px 45px rgba(15, 23, 42, .14);
}
.topbar-search-results a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  border-radius: 7px;
  text-decoration: none;
}
.topbar-search-results a:hover,
.topbar-search-results a:focus-visible { outline: 0; background: var(--brand-soft); }
.topbar-search-results a > i { width: 28px; color: var(--brand); font-size: 1.25rem; text-align: center; }
.topbar-search-results a > span { display: flex; min-width: 0; flex-direction: column; }
.topbar-search-results a strong { font-size: .84rem; }
.topbar-search-results a small { overflow: hidden; color: var(--muted); font-size: .72rem; text-overflow: ellipsis; white-space: nowrap; }
.topbar-search-results > p { padding: 24px 12px; color: var(--muted); font-size: .82rem; text-align: center; }
.icon-button,
.language-switch-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 38px;
  color: var(--brand);
  border: 1px solid color-mix(in srgb, var(--brand) 26%, var(--line));
  border-radius: 999px;
  background: color-mix(in srgb, var(--brand-soft) 82%, var(--surface));
  cursor: pointer;
  transition: border-color .18s ease, color .18s ease, background .18s ease, box-shadow .18s ease;
}
.icon-button {
  width: 38px;
  flex: 0 0 38px;
}
.icon-button:hover,
.language-switch-trigger:hover,
.language-switch.is-open .language-switch-trigger {
  color: var(--brand);
  border-color: var(--brand);
  background: var(--brand-soft);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 12%, transparent);
}
.icon-button:focus-visible,
.language-switch-trigger:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}
.icon-button i { font-size: 1.2rem; }
.mobile-menu { display: none; }
.language-switch {
  position: relative;
  flex: 0 0 auto;
}
.language-switch-trigger {
  gap: 6px;
  min-width: 38px;
  padding: 0 12px 0 10px;
  font-size: .84rem;
  font-weight: 700;
}
.language-switch.is-static .language-switch-trigger {
  cursor: default;
  box-shadow: none;
}
.language-switch-trigger > .ti-world { font-size: 1.08rem; }
.language-switch-code { min-width: 1.1em; text-align: center; letter-spacing: .02em; }
.language-switch-trigger > .ti-chevron-down {
  font-size: .78rem;
  color: color-mix(in srgb, var(--brand) 70%, var(--muted));
  transition: transform .18s ease, color .18s ease;
}
.language-switch-trigger:hover > .ti-chevron-down,
.language-switch.is-open .language-switch-trigger > .ti-chevron-down {
  color: var(--brand);
}
.language-switch.is-open .language-switch-trigger > .ti-chevron-down { transform: rotate(180deg); }
.language-switch-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 60;
  display: grid;
  gap: 4px;
  min-width: 196px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: 0 14px 36px rgba(15, 23, 42, .12);
}
.language-switch-option {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 10px;
  padding: 10px 10px;
  color: var(--ink);
  border-radius: 12px;
  text-decoration: none;
  font-size: .9rem;
  font-weight: 600;
}
a.language-switch-option:hover { background: var(--surface-soft); }
.language-switch-option.is-active {
  color: var(--brand);
  background: var(--brand-soft);
}
.language-switch-badge {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  color: var(--muted);
  border-radius: 8px;
  background: color-mix(in srgb, var(--line) 65%, var(--surface));
  font-size: .72rem;
  font-weight: 750;
  letter-spacing: .02em;
}
.language-switch-badge.is-active {
  color: white;
  background: var(--brand);
}
.language-switch-name { min-width: 0; line-height: 1.2; }
.language-switch-option > .ti-check {
  justify-self: end;
  color: var(--brand);
  font-size: 1rem;
}
.language-switch-check { width: 18px; height: 18px; }

.home-dashboard { width: min(1180px, 100%); margin: 0 auto; padding: 4px 42px 70px; flex: 1; }
.home-intro h1 { font-size: clamp(1.85rem, 3vw, 2.35rem); line-height: 1.2; letter-spacing: -.04em; }
.home-intro > p { margin-top: 6px; color: var(--muted); font-size: .92rem; }
.search-panel { margin-top: 22px; overflow: hidden; border: 1px solid var(--line-strong); border-radius: 10px; background: var(--surface); box-shadow: var(--shadow); }
.tool-search { display: flex; height: 66px; align-items: center; gap: 14px; padding: 0 18px; }
.tool-search > i { color: var(--muted); font-size: 1.45rem; }
.tool-search input { min-width: 0; flex: 1; border: 0; outline: 0; background: transparent; font-size: 1rem; }
.tool-search input::placeholder { color: var(--subtle); }
.recent-searches { display: flex; min-height: 54px; align-items: center; gap: 20px; padding: 8px 18px; border-top: 1px solid var(--line); background: var(--surface-soft); font-size: .76rem; }
.recent-searches { scrollbar-width: none; }
.recent-searches::-webkit-scrollbar { display: none; }
.recent-searches strong { color: var(--brand); white-space: nowrap; }
.recent-searches button { color: #536174; background: transparent; cursor: pointer; white-space: nowrap; }
html[data-theme="dark"] .recent-searches button { color: #b5c1be; }
.recent-searches button:hover { color: var(--brand); }
.recent-searches .clear-search { margin-left: auto; color: var(--brand); }

.home-section { scroll-margin-top: 86px; margin-top: 30px; }
.home-section-heading { display: flex; min-height: 30px; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.home-section-heading h2 { font-size: 1.06rem; letter-spacing: -.015em; }
.home-section-heading span { color: var(--muted); font-size: .75rem; }
.popular-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.popular-card {
  display: grid;
  min-height: 140px;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 14px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: border-color .18s ease, transform .18s ease;
}
.popular-card:hover { border-color: var(--brand); transform: translateY(-2px); }
.popular-card > i { align-self: center; color: var(--muted); font-size: 1.2rem; }
.popular-card:hover > i { color: var(--brand); }
.popular-copy { display: flex; min-width: 0; flex-direction: column; }
.popular-copy strong { margin-top: 3px; font-size: .98rem; }
.popular-copy small { display: -webkit-box; margin-top: 6px; overflow: hidden; color: var(--muted); font-size: .78rem; line-height: 1.55; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }

.tool-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.tool-item { position: relative; min-width: 0; }
.tool-link {
  display: grid;
  min-height: 128px;
  height: 100%;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 14px;
  padding: 20px 48px 20px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.tool-link:hover { border-color: var(--brand); box-shadow: 0 8px 24px rgba(15, 23, 42, .055); transform: translateY(-2px); }
.tool-icon { display: grid; width: 46px; height: 46px; flex: 0 0 46px; place-items: center; color: #173f3b; border: 1px solid #d6e8e5; border-radius: 9px; background: var(--brand-soft); }
html[data-theme="dark"] .tool-icon { color: #8ee1d9; border-color: #31534f; }
.tool-icon i { font-size: 1.62rem; }
.tool-icon .icon-svg { width: 26px; height: 26px; display: block; }
.tool-icon[data-tool="json-formatter"] { color: #07877f; background: #e9f6f4; border-color: #d6e8e5; }
.tool-icon[data-tool="base64"] { color: #4355c8; background: #eef1ff; border-color: #d9def7; }
.tool-icon[data-tool="url-encode"] { color: #0284c7; background: #e8f5fc; border-color: #cfe6f4; }
.tool-icon[data-tool="color-picker"] { color: #c2410c; background: #fff4eb; border-color: #f0d9c4; }
.tool-icon[data-tool="regex-test"] { color: #6d28d9; background: #f4effe; border-color: #e0d4f7; }
.tool-icon[data-tool="hash-generator"] { color: #4338ca; background: #eef0f8; border-color: #d8dcec; }
.tool-icon[data-tool="qr-code"] { color: #0f766e; background: #e7f7f3; border-color: #c9ebe3; }
.tool-icon[data-tool="timestamp"] { color: #b45309; background: #fff7e8; border-color: #f0e0bf; }
.tool-icon[data-tool="password-generator"] { color: #047857; background: #e8f8f1; border-color: #c9eadc; }
html[data-theme="dark"] .tool-icon[data-tool="json-formatter"] { color: #5eead4; background: #173a36; border-color: #31534f; }
html[data-theme="dark"] .tool-icon[data-tool="base64"] { color: #a5b4fc; background: #1e1f3a; border-color: #2f3158; }
html[data-theme="dark"] .tool-icon[data-tool="url-encode"] { color: #7dd3fc; background: #0f2a3a; border-color: #1d3f52; }
html[data-theme="dark"] .tool-icon[data-tool="color-picker"] { color: #fdba74; background: #3a2214; border-color: #5c3a24; }
html[data-theme="dark"] .tool-icon[data-tool="regex-test"] { color: #c4b5fd; background: #2a1f3d; border-color: #3f2f5c; }
html[data-theme="dark"] .tool-icon[data-tool="hash-generator"] { color: #a5b4fc; background: #1d2038; border-color: #32365a; }
html[data-theme="dark"] .tool-icon[data-tool="qr-code"] { color: #5eead4; background: #14302c; border-color: #2a4d47; }
html[data-theme="dark"] .tool-icon[data-tool="timestamp"] { color: #fbbf24; background: #3a2a12; border-color: #5c441c; }
html[data-theme="dark"] .tool-icon[data-tool="password-generator"] { color: #6ee7b7; background: #143029; border-color: #2a4d40; }
.topbar-search-results a .icon-svg {
  width: 20px;
  height: 20px;
  flex: 0 0 20px;
  color: var(--brand);
}
.tool-info { min-width: 0; }
.tool-info h4 { margin: 2px 0 5px; font-size: .95rem; line-height: 1.35; letter-spacing: -.01em; }
.tool-info p { display: -webkit-box; overflow: hidden; color: var(--muted); font-size: .78rem; line-height: 1.5; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.tool-arrow { align-self: center; color: var(--muted); font-size: 1.15rem; transition: color .18s ease, transform .18s ease; }
.tool-link:hover .tool-arrow { color: var(--brand); transform: translateX(3px); }
.favorite-button {
  position: absolute;
  top: 12px;
  right: 12px;
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  color: var(--subtle);
  border-radius: 7px;
  background: transparent;
  cursor: pointer;
  transition: color .18s ease, background .18s ease;
}
.favorite-button:hover, .favorite-button.active { color: var(--brand); background: var(--brand-soft); }
.favorite-button i { font-size: 1.05rem; }
.empty-tools { padding: 54px 20px; color: var(--muted); border: 1px dashed var(--line-strong); border-radius: var(--radius); text-align: center; }
.empty-tools i { display: block; margin-bottom: 8px; font-size: 2rem; }
.empty-tools strong { color: var(--ink); }
.empty-tools p { margin-top: 3px; font-size: .8rem; }

.tool-header {
  width: min(1080px, calc(100% - 72px));
  margin: 0 auto;
  padding: 8px 0 28px;
  border-bottom: 1px solid var(--line);
}
.tool-header h1 { font-size: clamp(1.8rem, 3vw, 2.35rem); line-height: 1.2; letter-spacing: -.04em; }
.tool-header p { max-width: 760px; margin-top: 9px; color: var(--muted); font-size: .94rem; line-height: 1.7; }
.tool-main {
  width: min(1080px, calc(100% - 72px));
  margin: 0 auto;
  padding: 28px 0 48px;
}
.tool-guide, .tool-faq {
  width: min(1080px, calc(100% - 72px));
  margin-left: auto;
  margin-right: auto;
  padding: 26px 28px;
  border: 1px solid color-mix(in srgb, var(--brand) 12%, var(--line));
  border-radius: 14px;
  background: var(--surface);
  box-shadow: 0 8px 28px rgba(15, 23, 42, .04);
}
.tool-faq { margin-top: 18px; margin-bottom: 54px; }
.tool-guide h2, .tool-faq h2 {
  font-size: 1.08rem;
  letter-spacing: -.02em;
  margin-bottom: 12px;
}
.tool-faq > h2 { margin-bottom: 4px; }
.tool-guide p, .tool-faq p {
  color: var(--muted);
  max-width: 850px;
  font-size: .84rem;
  line-height: 1.75;
}
.tool-guide ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px 28px;
  margin: 16px 0 0 1.1rem;
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.65;
}
.tool-guide li::marker { color: var(--brand); }
.tool-faq-item {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.tool-faq > h2 + .tool-faq-item { margin-top: 8px; }
.tool-faq-item:last-child { padding-bottom: 0; }
.tool-faq-item h3 {
  font-size: .9rem;
  font-weight: 680;
  margin-bottom: 5px;
}
@media (max-width: 768px) {
  .tool-guide ul { grid-template-columns: 1fr; }
  .tool-guide, .tool-faq { padding: 22px 18px; }
}
.tool-container { padding: clamp(22px, 4vw, 36px); border: 1px solid var(--line); border-radius: 12px; background: var(--surface); box-shadow: var(--shadow); }
.tool-container h2, .tool-container h3 { letter-spacing: -.015em; }

.form-group { margin-bottom: 22px; }
.form-group > label, .form-group > .field-label {
  display: block;
  margin-bottom: 8px;
  color: color-mix(in srgb, var(--brand) 82%, var(--ink));
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .01em;
}
.form-control, .form-group input[type="text"], .form-group input[type="datetime-local"], .form-group input[type="number"], .form-group textarea, .form-group select,
.hash-output input, #generatedPassword {
  width: 100%;
  padding: 12px 13px;
  color: var(--ink);
  border: 1px solid color-mix(in srgb, var(--brand) 14%, var(--line-strong));
  border-radius: 10px;
  background: var(--surface);
  outline: 0;
  transition: border-color .18s ease, box-shadow .18s ease, background .18s ease;
}
.form-group textarea { min-height: 180px; resize: vertical; font-family: "SFMono-Regular", Consolas, monospace; font-size: .84rem; line-height: 1.65; }
.form-group textarea::placeholder,
.form-group input::placeholder { color: var(--subtle); }
.form-group textarea[readonly],
.form-group input[readonly] { background: var(--surface-soft); }
.form-control:focus, .form-group input:focus, .form-group textarea:focus, .form-group select:focus, .hash-output input:focus {
  border-color: var(--brand);
  background: var(--surface);
  box-shadow: 0 0 0 3px rgba(7, 135, 127, .1);
}
.form-group input[type="checkbox"], .form-group input[type="radio"] { width: auto; accent-color: var(--brand); }
.btn, .copy-btn {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  margin: 0 7px 7px 0;
  padding: 10px 17px;
  color: white;
  border: 1px solid var(--brand);
  border-radius: 8px;
  background: var(--brand);
  cursor: pointer;
  font-size: .84rem;
  font-weight: 650;
  text-decoration: none;
  transition: background .18s ease, transform .18s ease;
}
.btn:hover, .copy-btn:hover { background: var(--brand-hover); transform: translateY(-1px); }
.btn-secondary, .copy-btn { color: var(--ink); border-color: var(--line-strong); background: var(--surface); }
.btn-secondary:hover, .copy-btn:hover { color: var(--brand); border-color: var(--brand); background: var(--brand-soft); }
.btn-danger { border-color: var(--danger); background: var(--danger); }
.result, .result-area, #regexResult { margin-top: 18px; padding: 18px; color: var(--muted); border: 1px solid var(--line); border-radius: 9px; background: var(--surface-soft); font-size: .84rem; }
.result-area h4, .result-area h3 { margin-bottom: 9px; color: var(--ink); }
.result-area ul { padding-left: 18px; }
.result-area li + li { margin-top: 6px; }
.hash-result { padding: 13px 0; border-bottom: 1px solid var(--line); }
.hash-result:last-child { border-bottom: 0; }
.hash-output { display: flex; gap: 8px; margin-top: 6px; }
.copy-btn { min-height: 38px; margin: 0; padding: 7px 12px; }
.example-item { margin-top: 8px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); cursor: pointer; transition: border-color .18s ease, background .18s ease; }
.example-item:hover { border-color: var(--brand); background: var(--brand-soft); }
.color-preview { border: 1px solid var(--line) !important; border-radius: 10px !important; }
input[type="range"] { width: 100%; accent-color: var(--brand); }

.error-page { display: grid; min-height: 100vh; place-content: center; gap: 10px; padding: 30px; text-align: center; }
.error-page h1 { color: var(--brand); font-size: clamp(5rem, 16vw, 9rem); line-height: 1; letter-spacing: -.08em; }
.error-page p { color: var(--muted); }
.error-page a { justify-self: center; margin-top: 12px; padding: 10px 16px; color: white; border-radius: 8px; background: var(--brand); text-decoration: none; }

.site-footer { margin-top: auto; border-top: 1px solid var(--line); background: var(--surface); }
.site-footer-inner {
  display: flex;
  width: min(1180px, calc(100% - 84px));
  min-height: 104px;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin: 0 auto;
  padding: 22px 0;
}
.site-footer p { display: flex; flex-direction: column; }
.site-footer p strong { font-size: .9rem; }
.site-footer p span { margin-top: 3px; color: var(--muted); font-size: .74rem; }
.site-footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px 20px; color: var(--muted); font-size: .75rem; }
.site-footer-links a { text-decoration: none; }
.site-footer-links a:hover { color: var(--brand); }

@media (max-width: 1120px) {
  .home-dashboard { padding-inline: 30px; }
  .tool-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); transition: transform .22s ease; }
  .menu-open .sidebar { transform: translateX(0); }
  .sidebar-overlay { position: fixed; inset: 0; z-index: 35; display: block; visibility: hidden; background: rgba(15, 23, 42, .38); opacity: 0; transition: opacity .22s ease, visibility .22s ease; }
  .menu-open .sidebar-overlay { visibility: visible; opacity: 1; }
  .main-content, .tool-content { margin-left: 0; }
  .mobile-menu { display: grid; }
  .app-topbar { height: 68px; padding-inline: 24px; border-bottom: 1px solid var(--line); }
  .home-dashboard { padding-top: 26px; padding-inline: 24px; }
  .tool-header { padding-top: 26px; }
}

@media (max-width: 720px) {
  .popular-grid { grid-template-columns: 1fr; }
  .popular-card { min-height: 108px; }
  .tool-grid { grid-template-columns: 1fr; }
  .recent-searches { gap: 12px; overflow-x: auto; }
  .recent-searches .clear-search { margin-left: 10px; }
}

@media (max-width: 560px) {
  .app-topbar { padding-inline: 14px; }
  .topbar-tool-search { width: auto; min-width: 0; flex: 1; }
  .topbar-tool-search > kbd { display: none; }
  .home-dashboard { padding: 24px 14px 54px; }
  .home-intro h1 { font-size: 1.72rem; }
  .tool-search { height: 58px; padding-inline: 14px; }
  .tool-search kbd { display: none; }
  .recent-searches { padding-inline: 14px; }
  .home-section { margin-top: 26px; }
  .tool-link { min-height: 112px; padding: 17px; }
  .tool-header, .tool-main { width: calc(100% - 28px); }
  .tool-header { padding-bottom: 22px; }
  .tool-main { padding-top: 16px; }
  .tool-container { padding: 18px 14px; }
  .btn { width: 100%; margin-right: 0; }
  .hash-output { flex-direction: column; }
  .brand-copy small { font-size: .72rem; }
  .site-footer-inner { width: calc(100% - 28px); min-height: 0; align-items: flex-start; flex-direction: column; gap: 14px; padding: 24px 0; }
  .site-footer-links { justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}