/* ═══════════════════════════════════════════════════════════════
   题库分类体系 · 数据 DEMO
   「数字档案馆 / 钤印」视觉系统
   米纸暖白 · 墨色文字 · 印记红（唯一强调色，克制使用）
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* 纸与墨 —— 禁纯黑纯白 */
  --paper:        #F6F1E7;
  --paper-hi:     #FAF7F0;
  --paper-lo:     #EFE8D8;
  --paper-inset:  #F1EAD9;
  --ink:          #1E1A16;
  --ink-75:       rgba(30, 26, 22, .75);
  --ink-60:       rgba(30, 26, 22, .60);
  --ink-45:       rgba(30, 26, 22, .45);
  --ink-30:       rgba(30, 26, 22, .30);
  --line:         rgba(30, 26, 22, .14);
  --line-soft:    rgba(30, 26, 22, .08);

  /* 印记红（朱砂） —— 唯一强调色 */
  --seal:         #C22E2A;
  --seal-deep:    #A5241F;
  --seal-wash:    rgba(194, 46, 42, .075);
  --seal-line:    rgba(194, 46, 42, .28);

  /* JSON 语法色（暖调档案色系，与纸墨协调） */
  --syn-key:      rgba(30, 26, 22, .58);
  --syn-str:      #6E5A2E;
  --syn-num:      #7A4A2B;
  --syn-null:     rgba(30, 26, 22, .38);
  --syn-punct:    rgba(30, 26, 22, .34);

  /* 字体 */
  --f-serif: "Noto Serif SC", "Songti SC", serif;
  --f-sans:  "Noto Sans SC", -apple-system, "PingFang SC", sans-serif;
  --f-mono:  "JetBrains Mono", ui-monospace, "SF Mono", monospace;

  /* 动效 —— 禁用默认 easing */
  --ease-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-quart: cubic-bezier(0.25, 1, 0.5, 1);

  --col-side: clamp(300px, 24vw, 340px);
}

/* ── 基底 ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  font-family: var(--f-sans);
  background: var(--paper);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

/* 纸面纹理：极淡的纤维噪点 + 顶部一线朱砂 */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  background:
    radial-gradient(1200px 500px at 70% -10%, rgba(194,46,42,.025), transparent 60%),
    radial-gradient(900px 700px at 10% 110%, rgba(30,26,22,.03), transparent 55%);
  z-index: 0;
}

::selection {
  background: var(--seal);
  color: var(--paper-hi);
}

/* 焦点 —— 键盘可访问，钤印红框 */
:focus-visible {
  outline: 2px solid var(--seal);
  outline-offset: 2px;
  border-radius: 2px;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
}

/* 滚动条 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(30,26,22,.16);
  border-radius: 4px;
  border: 2px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover { background-color: rgba(194,46,42,.35); }

/* ── 三栏骨架 ─────────────────────────────────────────── */
.app {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: var(--col-side) 1fr var(--col-side);
  height: 100vh;
  height: 100dvh;
}

.col {
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-right: 1px solid var(--line);
}
.col:last-child { border-right: none; border-left: 1px solid var(--line); }
.col-json { background: var(--paper-hi); }
.col-doc  { background: var(--paper); }

/* 入场编排：三栏依次浮现（仅 transform/opacity） */
.col {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .9s var(--ease-expo), transform .9s var(--ease-expo);
}
.app.is-in .col { opacity: 1; transform: translateY(0); }
.app.is-in .col-tree { transition-delay: .05s; }
.app.is-in .col-json { transition-delay: .18s; }
.app.is-in .col-doc  { transition-delay: .30s; }

/* 栏目标签行 */
.col-label {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 18px 12px;
  border-bottom: 1px solid var(--line);
  flex: none;
}
.col-num {
  font-family: var(--f-serif);
  font-weight: 900;
  font-size: 13px;
  color: var(--seal);
  border: 1px solid var(--seal-line);
  padding: 0 5px;
  border-radius: 2px;
  line-height: 1.5;
}
.col-title {
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .12em;
}
.col-sub, .crumb {
  font-size: 11px;
  color: var(--ink-45);
  letter-spacing: .04em;
  margin-left: auto;
  text-align: right;
}

/* ── 第一栏 · 品牌与结构树 ────────────────────────────── */
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 18px 16px;
  flex: none;
}

/* 印章：红底白字方形，双框仿印泥边 */
.seal {
  width: 52px; height: 52px;
  flex: none;
  background: var(--seal);
  color: var(--paper-hi);
  border-radius: 5px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  place-items: center;
  padding: 5px;
  box-shadow:
    inset 0 0 0 1.5px rgba(250, 247, 240, .55),
    inset 0 0 10px rgba(90, 10, 8, .35),
    2px 3px 0 rgba(194, 46, 42, .18);
  transform: rotate(-2deg);
}
.seal span {
  font-family: var(--f-serif);
  font-weight: 900;
  font-size: 17px;
  line-height: 1;
}

.brand-text h1 {
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: .08em;
  line-height: 1.3;
}
.brand-text p {
  font-size: 11px;
  color: var(--ink-45);
  letter-spacing: .22em;
  margin-top: 2px;
}

.tree {
  flex: 1;
  overflow-y: auto;
  padding: 6px 10px 24px;
  min-height: 0;
}

.tree-loading {
  padding: 40px 12px;
  text-align: center;
  color: var(--ink-45);
  font-size: 12px;
  letter-spacing: .2em;
}
.loading-seal {
  display: inline-grid;
  place-items: center;
  width: 34px; height: 34px;
  margin-bottom: 12px;
  background: var(--seal);
  color: var(--paper-hi);
  font-family: var(--f-serif);
  font-weight: 900;
  border-radius: 4px;
  transform: rotate(-3deg);
  animation: stamp 1.4s var(--ease-quart) infinite alternate;
}
@keyframes stamp {
  from { transform: rotate(-3deg) translateY(0);    opacity: .85; }
  to   { transform: rotate(-1deg) translateY(-4px); opacity: 1; }
}

/* 能力分组 */
.tgroup { margin-bottom: 4px; }

.tg-head {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 8px 7px;
  border-bottom: 1px solid var(--line-soft);
  transition: color .3s var(--ease-quart);
}
.tg-head:hover .tg-name { color: var(--seal); }
.tg-caret {
  font-size: 9px;
  color: var(--ink-45);
  transition: transform .45s var(--ease-expo);
  display: inline-block;
  width: 12px;
  flex: none;
}
.tgroup.is-open > .tg-head .tg-caret { transform: rotate(90deg); }
.tg-code {
  font-family: var(--f-mono);
  font-weight: 600;
  font-size: 11px;
  color: var(--seal);
  border: 1px solid var(--seal-line);
  background: var(--seal-wash);
  border-radius: 2px;
  padding: 0 5px;
  line-height: 1.6;
}
.tg-name {
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: .1em;
  transition: color .3s var(--ease-quart);
}
.tg-count {
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--ink-45);
}

.tg-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .5s var(--ease-expo);
}
.tg-body > div { overflow: hidden; }
.tgroup.is-open > .tg-body { grid-template-rows: 1fr; }

/* 题组节点 */
.tblock { padding: 2px 0 6px; }
.tblock.is-collapsed .tchildren { display: none; }

.tnode {
  position: relative;
  width: 100%;
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 5px 8px 5px 22px;
  border-radius: 3px;
  transition: background-color .3s var(--ease-quart);
}
.tnode::before {
  content: "";
  position: absolute;
  left: 6px; top: 50%;
  width: 3px; height: 3px;
  border-radius: 50%;
  background: var(--ink-30);
  transform: translateY(-50%);
  transition: background-color .3s var(--ease-quart), transform .3s var(--ease-quart);
}
.tnode:hover { background: rgba(30,26,22,.045); }
.tnode:hover::before { background: var(--seal); transform: translateY(-50%) scale(1.4); }

.tnode.is-selected {
  background: var(--seal-wash);
  box-shadow: inset 2px 0 0 var(--seal);
}
.tnode.is-selected::before { background: var(--seal); }

.tblock-head .tn-main {
  font-weight: 700;
  font-size: 13px;
}
.tn-main { font-size: 12.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tn-id {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--ink-45);
  flex: none;
}
.tn-kind {
  margin-left: auto;
  flex: none;
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--ink-45);
}
.tnode.is-selected .tn-id,
.tnode.is-selected .tn-kind { color: var(--seal); }

/* 子级分区小标 */
.tsect {
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--ink-30);
  padding: 8px 8px 2px 22px;
  user-select: none;
}

.tleaf .tn-main { font-weight: 400; color: var(--ink-75); }
.tleaf { padding-left: 30px; }
.tleaf::before { left: 16px; }

/* 题目行 + 计分点缩进 */
.tq { padding-left: 30px; }
.tq::before { left: 16px; }
.tq-seq {
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--ink-45);
  flex: none;
}
.tp { padding-left: 44px; }
.tp::before { left: 30px; border-radius: 0; width: 4px; height: 1.5px; }
.tp .tn-main { font-size: 11.5px; font-family: var(--f-mono); color: var(--ink-60); }

.tree-foot {
  flex: none;
  padding: 10px 18px;
  border-top: 1px solid var(--line);
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--ink-45);
  letter-spacing: .06em;
}

/* ── 第二栏 · JSON 视图 ───────────────────────────────── */
.json-meta {
  flex: none;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 11px;
  color: var(--ink-60);
  min-height: 38px;
}
.node-chip {
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--seal);
  border: 1px solid var(--seal-line);
  background: var(--seal-wash);
  border-radius: 2px;
  padding: 1px 7px;
}
.json-meta .hint { margin-left: auto; color: var(--ink-30); font-size: 10.5px; letter-spacing: .05em; }

.json-scroll {
  flex: 1;
  overflow: auto;
  min-height: 0;
  padding: 18px 22px 60px;
}

.json {
  font-family: var(--f-mono);
  font-size: 12.5px;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ink-75);
}

.j-punct { color: var(--syn-punct); }
.j-key   { color: var(--syn-key); }
.j-str   { color: var(--syn-str); }
.j-num   { color: var(--syn-num); }
.j-null  { color: var(--syn-null); font-style: italic; }

/* 可点击字段（顶层 key） */
.j-fkey {
  display: inline;
  font: inherit;
  color: var(--syn-key);
  padding: 0 1px;
  border-radius: 2px;
  cursor: pointer;
  border-bottom: 1px dashed transparent;
  transition: color .25s var(--ease-quart), background-color .25s var(--ease-quart), border-color .25s var(--ease-quart);
}
.j-fkey:hover {
  color: var(--seal);
  border-bottom-color: var(--seal-line);
  background: var(--seal-wash);
}

/* 关键字段：印记红（key + value） */
.j-fkey.is-key {
  color: var(--seal);
  font-weight: 600;
}
.j-fkey.is-key:hover { color: var(--seal-deep); }
.j-val.is-key { color: var(--seal); }
.j-val.is-key .j-str,
.j-val.is-key .j-num,
.j-val.is-key .j-null,
.j-val.is-key .j-key,
.j-val.is-key .j-punct { color: var(--seal); opacity: .82; }

/* 字段选中态 */
.j-fkey.is-active {
  background: var(--seal);
  color: var(--paper-hi) !important;
  border-bottom-color: transparent;
}
.j-val.is-active {
  background: var(--seal-wash);
  box-shadow: 0 1px 0 var(--seal-line);
}

/* ── 中栏 · 原题样貌（JSON 下方，同一滚动容器） ─────────── */
.source-view {
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.sv-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 14px;
}
.sv-title {
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .14em;
}
.sv-src {
  margin-left: auto;
  font-size: 10.5px;
  color: var(--ink-30);
  letter-spacing: .05em;
}
.source-text {
  font-family: var(--f-mono);
  font-size: 12px;
  line-height: 1.85;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ink-75);
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--seal-line);
  border-radius: 3px;
  padding: 16px 18px;
}

/* ── 第三栏 · 字段释义 ────────────────────────────────── */
.doc-scroll {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  padding: 20px 18px 60px;
}

.doc-card {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .55s var(--ease-expo), transform .55s var(--ease-expo);
}
.doc-card.is-in { opacity: 1; transform: translateY(0); }

.doc-head { margin-bottom: 18px; }
.doc-key {
  display: inline-block;
  font-family: var(--f-mono);
  font-weight: 600;
  font-size: 15px;
  color: var(--paper-hi);
  background: var(--seal);
  border-radius: 3px;
  padding: 3px 9px;
  box-shadow: 2px 2px 0 rgba(194,46,42,.18);
  transform: rotate(-.6deg);
  margin-bottom: 10px;
}
.doc-key.is-plain { background: var(--ink-60); box-shadow: 2px 2px 0 rgba(30,26,22,.12); }
.doc-name {
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .06em;
}
.doc-layer {
  display: inline-block;
  margin-left: 8px;
  font-size: 10.5px;
  color: var(--ink-45);
  letter-spacing: .1em;
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 0 6px;
  vertical-align: 2px;
}

.doc-sect { margin-bottom: 18px; }
.doc-sect-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--seal);
  margin-bottom: 7px;
}
.doc-sect-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-soft);
}
.doc-sect p {
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--ink-75);
}

/* 词表取值 chips */
.vocab { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 2px; }
.vocab span {
  font-size: 11.5px;
  padding: 2px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper-hi);
  color: var(--ink-75);
  white-space: nowrap;
}
.vocab span.v-hot {
  border-color: var(--seal-line);
  background: var(--seal-wash);
  color: var(--seal);
  font-weight: 500;
}
.vocab-note {
  margin-top: 8px;
  font-size: 11px;
  color: var(--ink-45);
  line-height: 1.7;
}

.doc-empty {
  padding: 48px 8px;
  text-align: center;
  color: var(--ink-45);
  font-size: 12px;
  letter-spacing: .12em;
  line-height: 2.2;
}

/* ── 动效降级 ─────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .col, .doc-card { opacity: 1; transform: none; }
}

/* ── 窄屏退让 ─────────────────────────────────────────── */
@media (max-width: 1080px) {
  :root { --col-side: 270px; }
}
@media (max-width: 900px) {
  .app { grid-template-columns: 240px 1fr 240px; }
}