/* ==========================================================================
   设计系统 · 卡片目录 (Card Catalog)
   灵感来自图书馆索引卡目录抽屉：知识条目与工具条目都是一张"卡片"，
   拥有自己的编目号 (KB-001 / TL-001)。首页用一叠真实内容预览的卡片
   作为视觉签名，呼应整站的组织逻辑。
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  /* 色彩 —— 以 #f7f8fa 为基底的冷灰主题 */
  --paper:      #f7f8fa;
  --paper-deep: #eceef2;
  --ink:        #1a1d23;
  --ink-soft:   #5a6070;
  --ink-faint:  #8a92a0;
  --line:       #e0e3e8;
  --line-soft:  #eceef1;
  --teal:       #1c7c6c;
  --teal-deep:  #135f52;
  --mustard:    #b7791f;
  --mustard-deep:#8a5a15;
  --rust:       #b3452b;
  --card-bg:    #ffffff;
  --white:      #ffffff;
  --shadow-tint: 26,29,35;

  /* 字体 */
  --font-display: 'Fraunces', ui-serif, Georgia, serif;
  --font-body: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, monospace;

  --radius: 6px;
  --radius-lg: 10px;
  --ease: cubic-bezier(.22,.61,.36,1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
img { max-width: 100%; display: block; }

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------------- 顶部导航 ---------------- */

header.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247,248,250,0.88);
  backdrop-filter: blur(8px);
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0;
  max-width: 1040px;
  margin: 0 auto;
  padding-left: 32px;
  padding-right: 32px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 9px;
  text-decoration: none;
  color: var(--ink);
}

.brand .stamp {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--paper);
  background: var(--ink);
  padding: 3px 6px;
  border-radius: 2px;
  transform: rotate(-3deg);
}

.brand .name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.01em;
}

nav.main-nav { display: flex; gap: 28px; }

nav.main-nav a {
  text-decoration: none;
  font-size: 14px;
  color: var(--ink-soft);
  padding: 4px 0;
  position: relative;
  transition: color .2s var(--ease);
}

nav.main-nav a::after {
  content: '';
  position: absolute;
  left: 0; right: 100%; bottom: -3px;
  height: 1px;
  background: var(--ink);
  transition: right .25s var(--ease);
}

nav.main-nav a:hover { color: var(--ink); }
nav.main-nav a:hover::after,
nav.main-nav a.active::after { right: 0; }
nav.main-nav a.active { color: var(--ink); }

/* ---------------- Hero（首页视觉重点）---------------- */

.hero {
  padding: 88px 0 96px;
}

.hero .wrap {
  display: grid;
  grid-template-columns: minmax(0,1fr) 380px;
  gap: 56px;
  align-items: center;
}

.hero-copy .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal-deep);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 22px;
}

.hero-copy .eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--rust);
}

.hero-copy h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(36px, 4.4vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 22px;
  max-width: 14ch;
}

.hero-copy p.lede {
  max-width: 48ch;
  color: var(--ink-soft);
  font-size: 17px;
  margin: 0 0 34px;
}

.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }

.pill {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 11px 18px;
  border-radius: 100px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease);
  border: 1px solid transparent;
}

.pill.solid {
  background: var(--ink);
  color: var(--paper);
}
.pill.solid:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(var(--shadow-tint),0.18); }

.pill.outline {
  border-color: var(--line);
  color: var(--ink);
  background: transparent;
}
.pill.outline:hover { border-color: var(--ink); transform: translateY(-2px); }

.pill .dot { width: 7px; height: 7px; border-radius: 50%; }
.pill.outline .dot.kb { background: var(--teal); }
.pill.outline .dot.tl { background: var(--mustard); }

/* ---- 签名视觉：一叠真实内容的卡片 ---- */

.card-stack {
  position: relative;
  height: 340px;
}

.stack-card {
  position: absolute;
  width: 100%;
  max-width: 300px;
  left: 50%;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  box-shadow: 0 14px 30px rgba(var(--shadow-tint),0.10);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}

.stack-card .catno {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
}

.stack-card h4 {
  font-family: var(--font-display);
  font-size: 17px;
  margin: 8px 0 6px;
  line-height: 1.3;
}

.stack-card p {
  font-size: 12.5px;
  color: var(--ink-soft);
  margin: 0;
  line-height: 1.5;
}

.stack-card .chip {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 3px 8px;
  border-radius: 100px;
}

.stack-card.c1 {
  transform: translate(-50%, 0) rotate(-7deg);
  z-index: 1;
}
.stack-card.c2 {
  transform: translate(-50%, 26px) rotate(4deg);
  z-index: 2;
}
.stack-card.c3 {
  transform: translate(-50%, 52px) rotate(-2deg);
  z-index: 3;
  box-shadow: 0 20px 40px rgba(var(--shadow-tint),0.16);
}

.card-stack:hover .c1 { transform: translate(-58%, -6px) rotate(-11deg); }
.card-stack:hover .c2 { transform: translate(-42%, 24px) rotate(7deg); }
.card-stack:hover .c3 { transform: translate(-50%, 44px) rotate(-2deg); }

.stack-card.c1 .chip { background: rgba(28,124,108,0.13); color: var(--teal-deep); }
.stack-card.c2 .chip { background: rgba(183,121,31,0.15); color: var(--mustard-deep); }
.stack-card.c3 .chip { background: rgba(179,69,43,0.12); color: var(--rust); }

/* ---------------- 区块 ---------------- */

.section {
  padding: 56px 0;
  border-top: 1px solid var(--line-soft);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 28px;
  gap: 16px;
  flex-wrap: wrap;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: 25px;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
}

.section-head .count {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-soft);
}
.section-head .count a { text-decoration: none; color: inherit; border-bottom: 1px solid var(--line); }
.section-head .count a:hover { border-color: var(--ink); }

/* ---------------- 卡片网格（目录卡） ---------------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.catalog-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 20px 18px;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
}

.catalog-card:hover {
  border-color: var(--ink);
  transform: translateY(-3px);
  box-shadow: 0 10px 22px rgba(var(--shadow-tint),0.09);
}

.catalog-card .catno {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  gap: 6px;
}
.catalog-card .catno::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--teal);
}
.catalog-card.tl .catno::before { background: var(--mustard); }

.catalog-card h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  margin: 0;
  line-height: 1.32;
}

.catalog-card p {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0;
  flex-grow: 1;
}

.catalog-card .meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  margin-top: 4px;
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 100px;
  background: var(--paper-deep);
  color: var(--ink-soft);
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 14px;
  grid-column: 1 / -1;
}

/* ---- 滚动淡入 ---- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---------------- 文章 / 工具页 通用容器 ---------------- */

.content-page { padding: 56px 0 90px; }

.content-page .catno {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--teal-deep);
  letter-spacing: 0.08em;
}

.content-page h1 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  margin: 12px 0 10px;
  letter-spacing: -0.01em;
}

.content-page .page-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  margin-bottom: 36px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

.content-page .prose { max-width: 68ch; font-size: 16px; }

.content-page .prose h2 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  margin: 44px 0 16px;
  letter-spacing: -0.01em;
}
.content-page .prose h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  margin: 32px 0 12px;
}

.content-page .prose p {
  color: var(--ink);
  margin: 0 0 18px;
}
.content-page .prose > p:first-of-type {
  font-size: 18px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.content-page .prose a {
  color: var(--teal-deep);
  text-decoration: none;
  background-image: linear-gradient(var(--teal-deep), var(--teal-deep));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1px;
  transition: background-size .2s var(--ease);
}
.content-page .prose a:hover { background-size: 100% 1px; }

.content-page .prose strong { font-weight: 600; }

.content-page .prose ul,
.content-page .prose ol {
  margin: 0 0 18px;
  padding-left: 22px;
  color: var(--ink);
}
.content-page .prose li { margin-bottom: 6px; }
.content-page .prose li::marker { color: var(--ink-faint); }

.content-page .prose blockquote {
  margin: 24px 0;
  padding: 4px 20px;
  border-left: 3px solid var(--teal);
  color: var(--ink-soft);
  font-style: italic;
}
.content-page .prose blockquote p:last-child { margin-bottom: 0; }

.content-page .prose hr {
  border: none;
  border-top: 1px solid var(--line-soft);
  margin: 40px 0;
}

.content-page .prose code {
  font-family: var(--font-mono);
  background: var(--paper-deep);
  padding: 2px 5px;
  border-radius: 2px;
  font-size: 0.9em;
}
.content-page .prose pre {
  background: var(--ink);
  color: var(--paper);
  padding: 18px 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  margin: 0 0 20px;
}
.content-page .prose pre code { background: none; padding: 0; color: inherit; }

/* 图片 / 图注：文章正文里的图片会撑出留白，配一行居中的说明文字 */
.content-page .prose img {
  display: block;
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  margin: 8px 0;
}
.content-page .prose figure {
  margin: 28px 0;
}
.content-page .prose figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-faint);
  text-align: center;
  margin-top: 8px;
}

.content-page .prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 24px;
  font-size: 14px;
}
.content-page .prose th,
.content-page .prose td {
  border: 1px solid var(--line);
  padding: 8px 12px;
  text-align: left;
}
.content-page .prose th {
  background: var(--paper-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-soft);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
  color: var(--ink-soft);
  margin-bottom: 24px;
  transition: color .15s var(--ease), transform .15s var(--ease);
}
.back-link:hover { color: var(--ink); transform: translateX(-2px); }

/* ---------------- 工具卡片外壳 ---------------- */

.tool-shell {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-top: 24px;
}

.tool-shell label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  margin-bottom: 6px;
  margin-top: 16px;
}
.tool-shell label:first-child { margin-top: 0; }

.tool-shell input,
.tool-shell select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink);
}
.tool-shell input:focus,
.tool-shell select:focus {
  outline: 2px solid var(--teal);
  outline-offset: 1px;
}

.tool-shell .row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: end;
}

.btn {
  font-family: var(--font-mono);
  font-size: 13px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  padding: 11px 18px;
  border-radius: 100px;
  cursor: pointer;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(var(--shadow-tint),0.18); }
.btn.ghost { background: transparent; color: var(--ink); }

/* ---------------- 简约小节标题（列表页 hero）---------------- */

.page-hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--line-soft);
}
.page-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal-deep);
  display: inline-block;
  margin-bottom: 16px;
}
.page-hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(30px, 4vw, 42px);
  margin: 0 0 14px;
  max-width: 18ch;
  letter-spacing: -0.01em;
}
.page-hero p.lede {
  max-width: 54ch;
  color: var(--ink-soft);
  font-size: 16px;
  margin: 0;
}

/* ---------------- 页脚 ---------------- */

footer.site-footer {
  border-top: 1px solid var(--line-soft);
  padding: 32px 0 48px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-faint);
}
footer.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------------- 响应式 ---------------- */

@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 48px; }
  .card-stack { height: 260px; max-width: 320px; margin: 0 auto; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .nav-row { padding-left: 20px; padding-right: 20px; }
  nav.main-nav { gap: 18px; }
  .hero { padding: 56px 0 64px; }
  .tool-shell .row { grid-template-columns: 1fr; }
  .section-head { align-items: flex-start; }
}

/* ---------------- 知识库前台编辑器 ---------------- */

.editor-shell {
  display: grid;
  grid-template-columns: minmax(0,1fr) minmax(0,1fr);
  gap: 20px;
  align-items: start;
}

.editor-field { margin-bottom: 14px; }
.editor-field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.editor-field input[type="text"],
.editor-field input[type="date"],
.editor-field textarea,
.editor-field select {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--ink);
}
.editor-field textarea { font-family: var(--font-mono); font-size: 13px; line-height: 1.6; resize: vertical; }
.editor-field input:focus, .editor-field textarea:focus, .editor-field select:focus {
  outline: 2px solid var(--teal); outline-offset: 1px;
}
.editor-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.md-toolbar { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 8px; }
.md-toolbar button {
  font-family: var(--font-mono);
  font-size: 12px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-soft);
  padding: 6px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all .15s var(--ease);
}
.md-toolbar button:hover { border-color: var(--teal); color: var(--teal-deep); }

.editor-preview {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--card-bg);
  padding: 24px 28px;
  min-height: 300px;
  position: sticky;
  top: 96px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}
.editor-preview .preview-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.status-line {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 10px 14px;
  border-radius: var(--radius);
  margin-top: 12px;
  display: none;
}
.status-line.show { display: block; }
.status-line.ok { background: rgba(28,124,108,0.1); color: var(--teal-deep); }
.status-line.err { background: rgba(179,69,43,0.1); color: var(--rust); }
.status-line.info { background: var(--paper-deep); color: var(--ink-soft); }

details.settings-box {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  margin-bottom: 20px;
  background: var(--card-bg);
}
details.settings-box summary {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-soft);
  cursor: pointer;
}
details.settings-box[open] summary { margin-bottom: 12px; }

@media (max-width: 900px) {
  .editor-shell { grid-template-columns: 1fr; }
  .editor-preview { position: static; max-height: none; }
}


@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
}