/* ══════════════════════════════════════════════════════════
   《全栈 IDC 牛马从入门到精通》
   设计语言：技术手册 + 编辑排版。细线、留白、单色为主，
   橙色只用在「信号」上（当前位置、术语、交互），青色给术语层。
   ══════════════════════════════════════════════════════════ */

:root {
  --paper:  #fbfaf8;
  --panel:  #ffffff;
  --sunk:   #f4f2ee;
  --ink:    #16181c;
  --ink-2:  #4a4f57;
  --ink-3:  #8b919b;
  --line:   #e5e2dc;
  --line-2: #d3cfc7;
  --accent: #b4530a;
  --accent-soft: #fdf1e6;
  --term:   #10695a;
  --term-soft: #e7f2ef;
  --hl-y: rgba(255, 205, 82, .42);
  --hl-b: rgba(120, 175, 255, .34);
  --hl-g: rgba(126, 220, 160, .34);
  --hl-p: rgba(206, 150, 255, .30);
  --danger: #b3261e;
  --radius: 10px;
  --rail-w: 282px;
  --side-w: 390px;
  --measure: 34.5em;
  --f-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
            "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", "WenQuanYi Micro Hei", sans-serif;
  --f-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Mono", Menlo, Consolas,
            "Liberation Mono", "Noto Sans Mono CJK SC", monospace;
  --shadow: 0 1px 2px rgba(20, 22, 26, .05), 0 8px 28px -12px rgba(20, 22, 26, .18);
  color-scheme: light;
}

:root[data-theme="dark"] {
  --paper:  #0e1013;
  --panel:  #15181c;
  --sunk:   #1a1e23;
  --ink:    #e7e4df;
  --ink-2:  #a8adb5;
  --ink-3:  #6d747d;
  --line:   #262b31;
  --line-2: #363d45;
  --accent: #e28a45;
  --accent-soft: #2a1d11;
  --term:   #4fc0a4;
  --term-soft: #11231f;
  --hl-y: rgba(214, 160, 40, .34);
  --hl-b: rgba(80, 130, 220, .32);
  --hl-g: rgba(70, 170, 120, .30);
  --hl-p: rgba(160, 110, 210, .30);
  --danger: #e8705f;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 12px 32px -14px rgba(0, 0, 0, .7);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-sans);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow: hidden;
}
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
::selection { background: var(--hl-y); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* ── 骨架 ───────────────────────────────────────────────── */
#app { display: flex; flex-direction: column; height: 100dvh; }

.topbar {
  display: flex; align-items: center; gap: 14px;
  height: 52px; padding: 0 14px; flex: 0 0 auto;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(10px);
  position: relative; z-index: 40;
}
.brand { display: flex; align-items: center; gap: 9px; text-decoration: none; min-width: 0; }
.brand-mark {
  width: 24px; height: 24px; flex: 0 0 auto; border-radius: 6px;
  background: var(--ink); color: var(--paper);
  display: grid; place-items: center;
  font-family: var(--f-mono); font-size: 12px; font-weight: 700; letter-spacing: -.04em;
}
.brand-name { font-weight: 650; letter-spacing: -.01em; white-space: nowrap; }
.brand-name small { color: var(--ink-3); font-weight: 400; margin-left: 6px; font-size: 11px; letter-spacing: .06em; }
.topbar .spacer { flex: 1 1 auto; }

.iconbtn {
  width: 32px; height: 32px; border-radius: 8px; display: grid; place-items: center;
  color: var(--ink-2); border: 1px solid transparent; flex: 0 0 auto;
}
.iconbtn:hover { background: var(--sunk); color: var(--ink); }
.iconbtn.on { background: var(--accent-soft); color: var(--accent); }
.iconbtn svg { width: 17px; height: 17px; }

.btn {
  display: inline-flex; align-items: center; gap: 6px; justify-content: center;
  height: 32px; padding: 0 13px; border-radius: 8px;
  border: 1px solid var(--line-2); background: var(--panel);
  font-size: 13px; font-weight: 550; white-space: nowrap;
  transition: background .12s, border-color .12s, transform .06s;
}
.btn:hover { border-color: var(--ink-3); }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-primary:hover { background: color-mix(in srgb, var(--ink) 85%, var(--accent)); border-color: transparent; }
.btn-ghost { border-color: transparent; background: none; color: var(--ink-2); }
.btn-ghost:hover { background: var(--sunk); color: var(--ink); }
.btn-sm { height: 27px; padding: 0 10px; font-size: 12px; border-radius: 7px; }
.btn[disabled] { opacity: .45; pointer-events: none; }

.shell { flex: 1 1 auto; display: flex; min-height: 0; }

/* ── 左栏：目录 ─────────────────────────────────────────── */
.rail {
  width: var(--rail-w); flex: 0 0 auto; border-right: 1px solid var(--line);
  display: flex; flex-direction: column; min-height: 0; background: var(--paper);
}
.rail-search { padding: 12px 12px 8px; }
.searchbox {
  display: flex; align-items: center; gap: 7px; height: 33px; padding: 0 10px;
  background: var(--sunk); border: 1px solid transparent; border-radius: 8px;
}
.searchbox:focus-within { border-color: var(--line-2); background: var(--panel); }
.searchbox svg { width: 14px; height: 14px; color: var(--ink-3); flex: 0 0 auto; }
.searchbox input { border: 0; background: none; outline: 0; width: 100%; font-size: 13px; }
.searchbox kbd {
  font-family: var(--f-mono); font-size: 10px; color: var(--ink-3);
  border: 1px solid var(--line-2); border-radius: 4px; padding: 1px 4px;
}
.rail-scroll { flex: 1 1 auto; overflow-y: auto; padding: 4px 8px 40px; }

.progress-card {
  margin: 4px 4px 12px; padding: 11px 12px; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--panel);
}
.progress-card .pc-h { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 8px; }
.progress-card .pc-t { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.progress-card .pc-n { font-family: var(--f-mono); font-size: 13px; font-weight: 600; }
.bar { height: 4px; border-radius: 99px; background: var(--sunk); overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent); border-radius: 99px; transition: width .4s ease; }
.progress-card .pc-sub { margin-top: 8px; font-size: 12px; color: var(--ink-3); }

.part { margin: 2px 0 14px; }
.part-h {
  display: flex; align-items: baseline; gap: 8px; width: 100%;
  padding: 7px 8px; border-radius: 7px; text-align: left; color: var(--ink-2);
}
.part-h:hover { background: var(--sunk); }
.part-h .pnum {
  font-family: var(--f-mono); font-size: 10px; letter-spacing: .06em;
  color: var(--accent); flex: 0 0 auto; font-weight: 600;
}
.part-h .ptitle { font-size: 12.5px; font-weight: 650; color: var(--ink); letter-spacing: -.01em; }
.part-h .pcount { margin-left: auto; font-size: 11px; color: var(--ink-3); font-family: var(--f-mono); }
.part.collapsed .part-list { display: none; }

.part-list { display: flex; flex-direction: column; gap: 1px; margin-top: 2px; }
.ch-link {
  display: grid; grid-template-columns: 34px 1fr; gap: 2px 6px; align-items: baseline;
  padding: 6px 8px; border-radius: 7px; text-decoration: none; color: var(--ink-2);
  border-left: 2px solid transparent; position: relative;
}
.ch-link:hover { background: var(--sunk); color: var(--ink); }
.ch-link .cnum { font-family: var(--f-mono); font-size: 11px; color: var(--ink-3); }
.ch-link .ctitle { font-size: 13px; line-height: 1.45; }
.ch-link.active { background: var(--accent-soft); border-left-color: var(--accent); color: var(--ink); }
.ch-link.active .cnum, .ch-link.active .ctitle { color: var(--accent); font-weight: 600; }
.ch-link.done .cnum::after { content: "✓"; margin-left: 4px; color: var(--term); }
.ch-link.planned .ctitle { color: var(--ink-3); }
.ch-link.planned::after {
  content: "待写"; grid-column: 2; font-size: 10px; color: var(--ink-3);
  border: 1px solid var(--line-2); border-radius: 4px; padding: 0 4px; justify-self: start; margin-top: 2px;
}
.ch-link .cbar { grid-column: 2; height: 2px; background: var(--line); border-radius: 2px; margin-top: 4px; }
.ch-link .cbar > i { display: block; height: 100%; background: var(--term); border-radius: 2px; }

.rail-links { padding: 6px 4px; border-top: 1px solid var(--line); margin-top: 6px; display: flex; flex-direction: column; }
.rail-links a {
  display: flex; align-items: center; gap: 9px; padding: 7px 10px; border-radius: 7px;
  text-decoration: none; color: var(--ink-2); font-size: 13px;
}
.rail-links a:hover { background: var(--sunk); color: var(--ink); }
.rail-links a .n { margin-left: auto; font-family: var(--f-mono); font-size: 11px; color: var(--ink-3); }
.rail-links svg { width: 15px; height: 15px; color: var(--ink-3); }

/* ── 中栏：正文 ─────────────────────────────────────────── */
.main { flex: 1 1 auto; overflow-y: auto; position: relative; scroll-behavior: smooth; }
.main-inner { max-width: calc(var(--measure) + 120px); margin: 0 auto; padding: 40px 60px 180px; }

.ch-head { margin-bottom: 36px; }
.ch-kicker {
  display: flex; align-items: center; gap: 10px; margin-bottom: 14px;
  font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3);
}
.ch-kicker .dot { width: 3px; height: 3px; border-radius: 99px; background: var(--line-2); }
.ch-kicker .num { font-family: var(--f-mono); color: var(--accent); font-weight: 650; letter-spacing: .05em; }
.ch-title { font-size: 32px; line-height: 1.25; letter-spacing: -.025em; font-weight: 700; margin: 0 0 10px; }
.ch-sub { font-size: 16px; color: var(--ink-2); margin: 0 0 18px; line-height: 1.6; }
.ch-meta {
  display: flex; gap: 16px; flex-wrap: wrap; padding-top: 14px; border-top: 1px solid var(--line);
  font-size: 12px; color: var(--ink-3); font-family: var(--f-mono);
}

/* 正文排版 */
.prose { font-size: 16.5px; line-height: 1.95; max-width: var(--measure); }
.prose > * { max-width: 100%; }
.prose h1 { display: none; }
.prose h2 {
  font-size: 22px; line-height: 1.35; letter-spacing: -.02em; font-weight: 700;
  margin: 3em 0 .9em; padding-top: .7em; border-top: 1px solid var(--line); position: relative;
}
.prose h3 { font-size: 17.5px; letter-spacing: -.01em; font-weight: 650; margin: 2.2em 0 .7em; }
.prose h4 { font-size: 15.5px; font-weight: 650; margin: 1.8em 0 .5em; color: var(--ink-2); }
.prose p { margin: 0 0 1.25em; }
.prose strong { font-weight: 650; }
.prose em { font-style: normal; background: linear-gradient(transparent 62%, var(--hl-y) 62%); }
.prose a:not(.anchor) { color: var(--accent); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }
.prose a:not(.anchor):hover { border-bottom-color: var(--accent); }
.prose ul, .prose ol { margin: 0 0 1.25em; padding-left: 1.4em; }
.prose li { margin: .35em 0; }
.prose li > ul { margin: .35em 0 .2em; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.6em 0; }
.prose blockquote {
  margin: 1.6em 0; padding: .2em 0 .2em 1.1em; border-left: 2px solid var(--line-2); color: var(--ink-2);
}
.prose blockquote p:last-child { margin-bottom: 0; }
.anchor {
  position: absolute; left: -1.1em; color: var(--ink-3); opacity: 0; text-decoration: none;
  font-weight: 400; font-family: var(--f-mono);
}
.prose h2:hover .anchor, .prose h3:hover .anchor { opacity: .6; }

.prose code {
  font-family: var(--f-mono); font-size: .875em; background: var(--sunk);
  padding: .12em .38em; border-radius: 5px; border: 1px solid var(--line);
  word-break: break-word;
}
.prose pre.code {
  font-family: var(--f-mono); font-size: 13px; line-height: 1.7;
  background: var(--sunk); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; overflow-x: auto; margin: 1.5em 0; position: relative;
}
.prose pre.code code { background: none; border: 0; padding: 0; font-size: inherit; }
.prose pre.code[data-lang]::before {
  content: attr(data-lang); position: absolute; top: 0; right: 10px;
  font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3);
}

.table-wrap { overflow-x: auto; margin: 1.6em 0; border: 1px solid var(--line); border-radius: var(--radius); }
.prose table { border-collapse: collapse; width: 100%; font-size: 14px; }
.prose th, .prose td { padding: 9px 13px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { background: var(--sunk); font-weight: 650; font-size: 12.5px; white-space: nowrap; }
.prose tbody tr:last-child td { border-bottom: 0; }
.prose tbody tr:hover { background: color-mix(in srgb, var(--sunk) 50%, transparent); }

figure.ascii { margin: 1.8em 0; }
figure.ascii pre {
  font-family: var(--f-mono); font-size: 12.5px; line-height: 1.55; overflow-x: auto;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 18px; color: var(--ink-2); white-space: pre;
}
figure.ascii figcaption, figure.img figcaption {
  margin-top: 9px; font-size: 12.5px; color: var(--ink-3); text-align: center;
}
figure.img { margin: 1.8em 0; }
figure.img img { width: 100%; border-radius: var(--radius); border: 1px solid var(--line); display: block; }

.callout {
  margin: 1.7em 0; border: 1px solid var(--line); border-left: 3px solid var(--line-2);
  border-radius: var(--radius); background: var(--panel); padding: 13px 16px;
}
.callout-h { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.callout-i { font-size: 13px; line-height: 1; }
.callout-t { font-size: 12px; font-weight: 700; letter-spacing: .06em; }
.callout-b > :first-child { margin-top: 0; }
.callout-b > :last-child { margin-bottom: 0; }
.callout-b { font-size: 15.5px; line-height: 1.8; }
.c-note  { border-left-color: var(--ink-3); }  .c-note  .callout-t { color: var(--ink-2); }
.c-tip   { border-left-color: var(--term); background: var(--term-soft); } .c-tip .callout-t { color: var(--term); }
.c-warn  { border-left-color: var(--accent); background: var(--accent-soft); } .c-warn .callout-t { color: var(--accent); }
.c-pit   { border-left-color: var(--danger); } .c-pit .callout-t { color: var(--danger); }
.c-war   { border-left-color: var(--line-2); background: var(--sunk); } .c-war .callout-t { color: var(--ink-2); }
.c-money { border-left-color: #8a6d1f; } .c-money .callout-t { color: #8a6d1f; }
:root[data-theme="dark"] .c-money { border-left-color: #c9a34f; }
:root[data-theme="dark"] .c-money .callout-t { color: #c9a34f; }
.c-quiz  { border-left-color: var(--term); } .c-quiz .callout-t { color: var(--term); }

/* 术语 */
.term {
  color: var(--term); cursor: pointer; border-bottom: 1px dashed color-mix(in srgb, var(--term) 55%, transparent);
  padding-bottom: 1px; transition: background .12s;
}
.term:hover { background: var(--term-soft); border-bottom-style: solid; }
.term.known { color: inherit; border-bottom-color: var(--line-2); }
.term.learning { background: var(--accent-soft); border-bottom-color: var(--accent); color: var(--accent); }
.term.active { background: var(--term); color: var(--panel); border-radius: 3px; border-bottom-color: transparent; }

/* 用户高亮 */
mark.hl { background: var(--hl-y); border-radius: 2px; padding: .05em 0; cursor: pointer; }
mark.hl[data-color="b"] { background: var(--hl-b); }
mark.hl[data-color="g"] { background: var(--hl-g); }
mark.hl[data-color="p"] { background: var(--hl-p); }
mark.hl[data-kind="question"] { background: none; border-bottom: 2px wavy var(--accent); border-bottom-style: wavy; }
mark.hl.focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.ch-nav { display: flex; gap: 12px; margin-top: 64px; padding-top: 22px; border-top: 1px solid var(--line); }
.ch-nav a {
  flex: 1 1 0; padding: 13px 15px; border: 1px solid var(--line); border-radius: var(--radius);
  text-decoration: none; background: var(--panel); min-width: 0;
}
.ch-nav a:hover { border-color: var(--ink-3); }
.ch-nav .dir { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.ch-nav .t { font-size: 14px; font-weight: 600; margin-top: 3px; display: block; }
.ch-nav a.next { text-align: right; }

.done-row { display: flex; align-items: center; gap: 12px; margin-top: 40px; padding: 16px; border: 1px dashed var(--line-2); border-radius: var(--radius); }
.done-row .t { font-size: 14px; }
.done-row .s { font-size: 12px; color: var(--ink-3); }

/* ── 右栏：侧边栏 ───────────────────────────────────────── */
.side {
  width: var(--side-w); flex: 0 0 auto; border-left: 1px solid var(--line);
  background: var(--panel); display: flex; flex-direction: column; min-height: 0;
}
.side-tabs { display: flex; gap: 2px; padding: 8px 8px 0; border-bottom: 1px solid var(--line); }
.side-tab {
  padding: 7px 11px 9px; font-size: 12.5px; font-weight: 550; color: var(--ink-3);
  border-bottom: 2px solid transparent; margin-bottom: -1px; display: flex; align-items: center; gap: 6px;
}
.side-tab:hover { color: var(--ink); }
.side-tab.on { color: var(--ink); border-bottom-color: var(--accent); }
.side-tab .badge {
  font-family: var(--f-mono); font-size: 10px; background: var(--sunk);
  border-radius: 99px; padding: 1px 5px; color: var(--ink-3);
}
.side-tab.on .badge { background: var(--accent-soft); color: var(--accent); }
.side-body { flex: 1 1 auto; overflow-y: auto; padding: 16px; }
.side-foot { flex: 0 0 auto; border-top: 1px solid var(--line); padding: 10px; }

.empty { text-align: center; padding: 42px 18px; color: var(--ink-3); }
.empty .ei { font-size: 22px; opacity: .5; margin-bottom: 10px; }
.empty .et { font-size: 13.5px; line-height: 1.7; }

/* 词条卡 */
.tcard-h { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 4px; }
.tcard-term { font-size: 20px; font-weight: 700; letter-spacing: -.02em; line-height: 1.3; }
.tcard-en { font-size: 12.5px; color: var(--ink-3); font-family: var(--f-mono); margin-top: 2px; word-break: break-word; }
.tcard-cat {
  font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--term);
  background: var(--term-soft); border-radius: 5px; padding: 2px 7px; flex: 0 0 auto; margin-top: 4px;
}
.tcard-short {
  margin: 12px 0; padding: 11px 13px; background: var(--sunk); border-radius: 8px;
  font-size: 14.5px; line-height: 1.7;
}
.tcard-body { font-size: 14.5px; line-height: 1.82; color: var(--ink-2); }
.tcard-body p { margin: 0 0 .9em; }
.tcard-body h3 { font-size: 13.5px; color: var(--ink); margin: 1.3em 0 .4em; }
.tcard-body ul { padding-left: 1.2em; margin: 0 0 .9em; }
.tcard-body code { font-family: var(--f-mono); font-size: .88em; background: var(--sunk); padding: .1em .35em; border-radius: 4px; }
.tcard-body pre.code { font-family: var(--f-mono); font-size: 12px; background: var(--sunk); padding: 10px 12px; border-radius: 8px; overflow-x: auto; }
.tcard-body table { font-size: 13px; }
.tcard-sec { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line); }
.tcard-sec .lbl { font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-size: 12px; padding: 3px 9px; border: 1px solid var(--line); border-radius: 99px;
  color: var(--ink-2); background: var(--panel);
}
.chip:hover { border-color: var(--term); color: var(--term); }
.chip.on { background: var(--term); color: var(--panel); border-color: var(--term); }
.learn-row { display: flex; gap: 6px; margin-top: 14px; }
.learn-row .btn { flex: 1 1 0; }
.learn-row .btn.on { background: var(--accent); color: #fff; border-color: var(--accent); }

/* AI 助教 */
.ai-wrap { display: flex; flex-direction: column; height: 100%; }
.thread { display: flex; flex-direction: column; gap: 14px; }
.msg { font-size: 14.5px; line-height: 1.8; }
.msg.user {
  background: var(--sunk); border-radius: 10px 10px 3px 10px; padding: 10px 13px;
  align-self: flex-end; max-width: 92%; white-space: pre-wrap; word-break: break-word;
}
.msg.ai { color: var(--ink-2); }
.msg.ai p { margin: 0 0 .85em; }
.msg.ai h3 { font-size: 14px; color: var(--ink); margin: 1.2em 0 .4em; }
.msg.ai ul, .msg.ai ol { padding-left: 1.25em; margin: 0 0 .85em; }
.msg.ai pre.code { font-family: var(--f-mono); font-size: 12px; background: var(--sunk); border: 1px solid var(--line); padding: 10px 12px; border-radius: 8px; overflow-x: auto; margin: .8em 0; }
.msg.ai code { font-family: var(--f-mono); font-size: .88em; background: var(--sunk); padding: .1em .35em; border-radius: 4px; }
.msg.ai table { font-size: 13px; border-collapse: collapse; }
.msg.ai th, .msg.ai td { border: 1px solid var(--line); padding: 5px 8px; }
.msg .quote-ref {
  border-left: 2px solid var(--accent); padding: 2px 0 2px 9px; margin-bottom: 8px;
  font-size: 12.5px; color: var(--ink-3); line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.typing::after {
  content: "▍"; animation: blink .9s steps(2) infinite; color: var(--accent); margin-left: 1px;
}
@keyframes blink { 50% { opacity: 0; } }

.composer { border: 1px solid var(--line-2); border-radius: 10px; background: var(--panel); padding: 8px 10px; }
.composer:focus-within { border-color: var(--accent); }
.composer textarea {
  width: 100%; border: 0; outline: 0; background: none; resize: none; font-size: 14px;
  line-height: 1.6; max-height: 160px; min-height: 22px;
}
.composer-row { display: flex; align-items: center; gap: 8px; margin-top: 6px; }
.composer-row .hint { font-size: 11px; color: var(--ink-3); margin-right: auto; }
.quote-chip {
  font-size: 12px; color: var(--ink-3); background: var(--sunk); border-radius: 6px;
  padding: 5px 8px; margin-bottom: 7px; display: flex; gap: 6px; align-items: flex-start;
}
.quote-chip span { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.quote-chip button { margin-left: auto; color: var(--ink-3); flex: 0 0 auto; }
.ask-presets { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }

.thread-list { display: flex; flex-direction: column; gap: 4px; }
.thread-item {
  display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-radius: 8px;
  text-align: left; width: 100%; border: 1px solid transparent;
}
.thread-item:hover { background: var(--sunk); }
.thread-item .tt { font-size: 13px; font-weight: 550; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.thread-item .td { font-size: 11px; color: var(--ink-3); margin-left: auto; font-family: var(--f-mono); flex: 0 0 auto; }

/* 标记列表 */
.mark-item {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 11px 13px;
  margin-bottom: 9px; background: var(--panel);
}
.mark-item:hover { border-color: var(--line-2); }
.mark-h { display: flex; align-items: center; gap: 7px; margin-bottom: 7px; }
.mark-kind { font-size: 10.5px; letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3); }
.mark-swatch { width: 9px; height: 9px; border-radius: 3px; background: var(--hl-y); }
.mark-q { font-size: 13.5px; line-height: 1.65; border-left: 2px solid var(--hl-y); padding-left: 9px; }
.mark-note { margin-top: 8px; font-size: 13px; color: var(--ink-2); background: var(--sunk); border-radius: 7px; padding: 7px 9px; }
.mark-acts { display: flex; gap: 4px; margin-top: 9px; }
.mark-item .where { font-size: 11px; color: var(--ink-3); margin-bottom: 6px; font-family: var(--f-mono); }

/* ── 划词浮条 ───────────────────────────────────────────── */
.seltool {
  position: absolute; z-index: 60; display: flex; align-items: center; gap: 1px;
  background: var(--ink); color: var(--paper); border-radius: 9px; padding: 4px;
  box-shadow: var(--shadow); transform: translate(-50%, -100%); white-space: nowrap;
  animation: pop .12s ease-out;
}
@keyframes pop { from { opacity: 0; transform: translate(-50%, -94%); } }
.seltool button {
  color: inherit; padding: 5px 9px; border-radius: 6px; font-size: 12.5px;
  display: flex; align-items: center; gap: 5px;
}
.seltool button:hover { background: rgba(255,255,255,.15); }
:root[data-theme="dark"] .seltool button:hover { background: rgba(255,255,255,.12); }
.seltool .sep { width: 1px; height: 16px; background: rgba(255,255,255,.2); margin: 0 3px; }
.seltool .sw { width: 15px; height: 15px; border-radius: 4px; border: 1px solid rgba(255,255,255,.3); }
.seltool svg { width: 14px; height: 14px; }

/* ── 首页 / 列表页 ──────────────────────────────────────── */
.cover { padding: 20px 0 10px; }
.cover-badge {
  display: inline-flex; align-items: center; gap: 7px; font-size: 11px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent); background: var(--accent-soft);
  border-radius: 99px; padding: 4px 11px; margin-bottom: 20px;
}
.cover h1 { font-size: 42px; line-height: 1.15; letter-spacing: -.035em; margin: 0 0 14px; font-weight: 750; }
.cover .lede { font-size: 17px; line-height: 1.75; color: var(--ink-2); max-width: 32em; margin: 0 0 22px; }
.cover-chain {
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 26px 0;
  font-family: var(--f-mono); font-size: 11.5px; color: var(--ink-3);
}
.cover-chain b { color: var(--ink); font-weight: 600; background: var(--sunk); border: 1px solid var(--line); border-radius: 6px; padding: 3px 8px; }
.stat-row { display: flex; gap: 26px; flex-wrap: wrap; margin: 26px 0 34px; padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stat .v { font-family: var(--f-mono); font-size: 22px; font-weight: 650; letter-spacing: -.02em; }
.stat .k { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-top: 2px; }

.part-card { margin: 0 0 8px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--panel); }
.part-card-h { display: flex; align-items: baseline; gap: 12px; padding: 14px 18px; width: 100%; text-align: left; }
.part-card-h:hover { background: var(--sunk); }
.part-card-h .pn { font-family: var(--f-mono); font-size: 11px; color: var(--accent); font-weight: 650; letter-spacing: .06em; }
.part-card-h .pt { font-size: 16px; font-weight: 650; letter-spacing: -.015em; }
.part-card-h .pd { font-size: 12.5px; color: var(--ink-3); margin-left: auto; text-align: right; }
.part-card-b { border-top: 1px solid var(--line); padding: 6px; display: none; }
.part-card.open .part-card-b { display: block; }
.part-card .pdesc { padding: 0 18px 14px; margin-top: -6px; font-size: 13.5px; color: var(--ink-2); line-height: 1.7; }

.glist { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; }
.gitem { border: 1px solid var(--line); border-radius: 9px; padding: 11px 13px; text-align: left; background: var(--panel); }
.gitem:hover { border-color: var(--term); }
.gitem .gt { font-weight: 650; font-size: 14px; }
.gitem .ge { font-size: 11px; color: var(--ink-3); font-family: var(--f-mono); }
.gitem .gs { font-size: 12.5px; color: var(--ink-2); margin-top: 5px; line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.cat-filter { display: flex; flex-wrap: wrap; gap: 6px; margin: 16px 0 20px; }

.page-title { font-size: 26px; font-weight: 700; letter-spacing: -.02em; margin: 6px 0 6px; }
.page-sub { color: var(--ink-3); font-size: 14px; margin-bottom: 26px; }

/* 搜索结果 */
.sr { border-bottom: 1px solid var(--line); padding: 14px 0; }
.sr a { text-decoration: none; }
.sr .srt { font-size: 15.5px; font-weight: 650; }
.sr .srp { font-size: 11.5px; color: var(--ink-3); font-family: var(--f-mono); margin-bottom: 3px; }
.sr .srs { font-size: 13.5px; color: var(--ink-2); line-height: 1.7; margin-top: 5px; }
.sr .srs b { background: var(--hl-y); font-weight: 600; border-radius: 2px; padding: 0 1px; }

/* ── 弹窗 ───────────────────────────────────────────────── */
.modal-bg {
  position: fixed; inset: 0; background: rgba(12, 14, 17, .45); z-index: 100;
  display: grid; place-items: center; padding: 20px; backdrop-filter: blur(3px);
  animation: fade .15s;
}
@keyframes fade { from { opacity: 0; } }
.modal {
  background: var(--panel); border-radius: 14px; box-shadow: var(--shadow);
  width: min(430px, 100%); padding: 26px; border: 1px solid var(--line);
  max-height: 90dvh; overflow-y: auto;
}
.modal h2 { font-size: 20px; margin: 0 0 6px; letter-spacing: -.02em; }
.modal .sub { color: var(--ink-3); font-size: 13.5px; margin: 0 0 20px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 12px; font-weight: 600; margin-bottom: 5px; color: var(--ink-2); }
.field input, .field select, .field textarea {
  width: 100%; height: 38px; padding: 0 11px; border: 1px solid var(--line-2);
  border-radius: 8px; background: var(--paper); outline: 0; font-size: 14px;
}
.field textarea { height: auto; padding: 9px 11px; min-height: 80px; resize: vertical; line-height: 1.6; }
.field input:focus, .field textarea:focus { border-color: var(--accent); }
.field .hint { font-size: 11.5px; color: var(--ink-3); margin-top: 4px; }
.msg-err { background: color-mix(in srgb, var(--danger) 10%, transparent); color: var(--danger); font-size: 13px; padding: 9px 11px; border-radius: 8px; margin-bottom: 14px; }
.msg-ok { background: var(--term-soft); color: var(--term); font-size: 13px; padding: 9px 11px; border-radius: 8px; margin-bottom: 14px; }
.tabs-line { display: flex; gap: 16px; border-bottom: 1px solid var(--line); margin-bottom: 20px; }
.tabs-line button { padding: 8px 0 10px; font-size: 14px; font-weight: 600; color: var(--ink-3); border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tabs-line button.on { color: var(--ink); border-bottom-color: var(--accent); }

.menu {
  position: absolute; right: 12px; top: 48px; z-index: 50; background: var(--panel);
  border: 1px solid var(--line); border-radius: 11px; box-shadow: var(--shadow);
  padding: 6px; min-width: 210px;
}
.menu .mi { display: flex; align-items: center; gap: 9px; width: 100%; padding: 8px 10px; border-radius: 7px; font-size: 13.5px; text-align: left; text-decoration: none; color: var(--ink); }
.menu .mi:hover { background: var(--sunk); }
.menu .mh { padding: 8px 10px 6px; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.menu hr { border: 0; border-top: 1px solid var(--line); margin: 5px 0; }
.menu .mi svg { width: 15px; height: 15px; color: var(--ink-3); }

.toast {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: var(--paper); font-size: 13.5px; padding: 9px 16px;
  border-radius: 99px; z-index: 200; box-shadow: var(--shadow); animation: pop2 .16s;
}
@keyframes pop2 { from { opacity: 0; transform: translate(-50%, 8px); } }

/* 阅读进度条 */
.readbar { position: absolute; top: 0; left: 0; height: 2px; background: var(--accent); z-index: 30; transition: width .1s linear; }

/* 字号档 */
:root[data-size="s"] .prose { font-size: 15.5px; }
:root[data-size="l"] .prose { font-size: 18px; line-height: 2; }
:root[data-size="xl"] .prose { font-size: 19.5px; line-height: 2.05; --measure: 32em; }

/* ── 响应式 ─────────────────────────────────────────────── */
.scrim { display: none; }
.mobile-only, .tablet-only { display: none; }

@media (max-width: 1280px) {
  :root { --side-w: 340px; }
  .main-inner { padding: 34px 40px 160px; }
}
@media (max-width: 1080px) {
  .side {
    position: fixed; right: 0; top: 52px; bottom: 0; z-index: 70; width: min(420px, 92vw);
    box-shadow: var(--shadow); transform: translateX(101%); transition: transform .22s ease;
  }
  .side.open { transform: none; }
  .tablet-only { display: grid; }
  .scrim.on { display: block; position: fixed; inset: 52px 0 0; background: rgba(10,12,14,.35); z-index: 60; }
}
@media (max-width: 860px) {
  .rail {
    position: fixed; left: 0; top: 52px; bottom: 0; z-index: 70; width: min(320px, 88vw);
    transform: translateX(-101%); transition: transform .22s ease; box-shadow: var(--shadow);
    background: var(--panel);
  }
  .rail.open { transform: none; }
  .main-inner { padding: 26px 20px 160px; }
  .mobile-only { display: grid; }
  .ch-title { font-size: 26px; }
  .cover h1 { font-size: 32px; }
  .prose { font-size: 16px; }
  .topbar { padding: 0 8px; gap: 8px; }
  .brand-name small { display: none; }
}
@media (max-width: 520px) {
  .modal { padding: 20px; border-radius: 12px; }
  .stat-row { gap: 18px; }
}
@media print {
  .topbar, .rail, .side, .seltool, .ch-nav { display: none !important; }
  body { overflow: visible; }
  .main { overflow: visible; }
  .main-inner { max-width: none; padding: 0; }
}

/* ── 导出页 ─────────────────────────────────────────────── */
.exp-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 14px; }
.exp-card {
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel);
  padding: 18px 20px; display: flex; flex-direction: column; gap: 10px;
}
.exp-card:hover { border-color: var(--line-2); }
.exp-h { display: flex; align-items: center; gap: 9px; font-size: 16px; font-weight: 650; letter-spacing: -.01em; }
.exp-i { font-size: 18px; line-height: 1; }
.exp-card p { margin: 0; font-size: 13.5px; line-height: 1.75; color: var(--ink-2); }
.exp-card kbd {
  font-family: var(--f-mono); font-size: 11px; border: 1px solid var(--line-2);
  border-radius: 4px; padding: 1px 5px; color: var(--ink);
}
.exp-feat { margin: 0; padding-left: 1.1em; font-size: 12.5px; color: var(--ink-3); line-height: 1.8; }
.exp-note {
  font-size: 12px; line-height: 1.7; color: var(--ink-3); background: var(--sunk);
  border-radius: 8px; padding: 9px 11px;
}
.exp-picks { border-top: 1px solid var(--line); padding-top: 10px; margin-top: 2px; }
.exp-picks-h { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 7px; }
.pick { display: flex; align-items: center; gap: 8px; font-size: 12.5px; padding: 3px 0; cursor: pointer; }
.pick input { accent-color: var(--accent); }
.pick em { margin-left: auto; font-style: normal; font-size: 11px; color: var(--ink-3); font-family: var(--f-mono); }
.exp-card .btn { align-self: flex-start; margin-top: auto; }

/* ── 闪卡复习 ───────────────────────────────────────────── */
.rv-stats { display: flex; gap: 8px; align-items: flex-end; margin: 0 0 26px; }
.rv-col { flex: 1 1 0; text-align: center; }
.rv-colbar {
  height: 54px; display: flex; align-items: flex-end; justify-content: center;
  background: var(--sunk); border-radius: 6px; overflow: hidden;
}
.rv-colbar > i { display: block; width: 100%; background: var(--term); border-radius: 6px 6px 0 0; min-height: 2px; transition: height .3s; }
.rv-coln { font-family: var(--f-mono); font-size: 12px; font-weight: 600; margin-top: 5px; }
.rv-coll { font-size: 10px; color: var(--ink-3); }

.rv-bar { display: flex; align-items: center; gap: 12px; font-size: 12px; color: var(--ink-3); margin-bottom: 8px; font-family: var(--f-mono); }
.rv-box { background: var(--term-soft); color: var(--term); border-radius: 5px; padding: 1px 7px; }
.rv-cat { background: var(--sunk); border-radius: 5px; padding: 1px 7px; }

.rv-card {
  border: 1px solid var(--line); border-radius: 14px; background: var(--panel);
  padding: 34px 28px; min-height: 220px; cursor: pointer; transition: border-color .15s;
}
.rv-card:not(.flipped):hover { border-color: var(--term); }
.rv-card.flipped { cursor: default; }
.rv-front { text-align: center; }
.rv-card.flipped .rv-front { text-align: left; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.rv-term { font-size: 30px; font-weight: 700; letter-spacing: -.025em; line-height: 1.25; }
.rv-card.flipped .rv-term { font-size: 21px; }
.rv-en { font-family: var(--f-mono); font-size: 12.5px; color: var(--ink-3); margin-top: 6px; word-break: break-word; }
.rv-hint { margin-top: 26px; font-size: 12.5px; color: var(--ink-3); }
.rv-back { padding-top: 16px; animation: fade .18s; }
.rv-short { background: var(--sunk); border-radius: 9px; padding: 12px 14px; font-size: 15px; line-height: 1.75; margin-bottom: 14px; }
.rv-body { font-size: 14.5px; }
.rv-body > :first-child { margin-top: 0; }

.rv-acts { display: flex; gap: 10px; margin-top: 18px; }
.rv-acts .btn { height: 40px; font-size: 14px; }
.rv-no { flex: 1 1 0; border-color: var(--accent); color: var(--accent); }
.rv-no:hover { background: var(--accent-soft); }
.rv-ok { flex: 1 1 0; background: var(--term); color: #fff; border-color: var(--term); }
.rv-ok:hover { filter: brightness(1.08); }
.rv-tip { font-size: 12px; color: var(--ink-3); margin-top: 14px; line-height: 1.7; }

.rv-done { text-align: center; padding: 44px 20px 30px; }
.rv-done-i { font-size: 34px; color: var(--term); margin-bottom: 12px; }
.rv-done-t { font-size: 18px; font-weight: 650; letter-spacing: -.02em; }
.rv-done-s { font-size: 13.5px; color: var(--ink-3); margin-top: 8px; line-height: 1.75; max-width: 34em; margin-inline: auto; }

.rv-enroll { border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; background: var(--panel); margin-top: 8px; }
.rv-enroll-h { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 12px; }
.rv-row { display: flex; gap: 8px; margin-bottom: 9px; flex-wrap: wrap; }
.rv-row .btn { flex: 0 0 auto; }
.rv-row > select {
  flex: 1 1 200px; height: 32px; padding: 0 9px; border: 1px solid var(--line-2);
  border-radius: 8px; background: var(--paper); outline: 0; font-size: 13px; min-width: 0;
}
.rv-row > select:focus { border-color: var(--accent); }

@media (max-width: 640px) {
  .rv-term { font-size: 24px; }
  .rv-card { padding: 26px 18px; min-height: 180px; }
  .rv-acts { flex-wrap: wrap; }
  .rv-coll { display: none; }
}

/* ── 勘误 ───────────────────────────────────────────────── */
.err-row {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin-top: 18px; padding: 12px 16px; border: 1px dashed var(--line-2);
  border-radius: var(--radius); font-size: 13px; color: var(--ink-3);
}
.err-row .btn { margin-left: auto; }

.err-card {
  border: 1px solid var(--line); border-left: 3px solid var(--line-2);
  border-radius: var(--radius); background: var(--panel); padding: 13px 16px; margin-bottom: 10px;
}
.err-card.st-open { border-left-color: var(--accent); }
.err-card.st-accepted { border-left-color: #8a6d1f; }
.err-card.st-fixed { border-left-color: var(--term); }
.err-card.st-rejected { border-left-color: var(--ink-3); opacity: .7; }
.err-h { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; margin-bottom: 8px; }
.err-st {
  font-size: 10.5px; letter-spacing: .06em; padding: 2px 8px; border-radius: 99px;
  background: var(--sunk); color: var(--ink-2);
}
.err-st.st-open { background: var(--accent-soft); color: var(--accent); }
.err-st.st-fixed { background: var(--term-soft); color: var(--term); }
.err-kind { font-size: 11.5px; color: var(--ink-3); }
.err-loc { font-size: 11.5px; color: var(--ink-2); text-decoration: none; font-family: var(--f-mono); }
.err-loc:hover { color: var(--accent); }
.err-body { font-size: 14px; line-height: 1.75; white-space: pre-wrap; word-break: break-word; }
.err-reply {
  margin-top: 9px; font-size: 13px; line-height: 1.7; color: var(--ink-2);
  background: var(--sunk); border-radius: 7px; padding: 8px 10px;
}
.err-contact { margin-top: 7px; font-size: 11.5px; color: var(--ink-3); font-family: var(--f-mono); }
.err-admin { margin-top: 11px; padding-top: 11px; border-top: 1px solid var(--line); }
.err-admin input {
  width: 100%; height: 32px; padding: 0 10px; border: 1px solid var(--line-2);
  border-radius: 8px; background: var(--paper); outline: 0; font-size: 13px; margin-bottom: 8px;
}
.err-admin input:focus { border-color: var(--accent); }

/* ── 矢量图 ─────────────────────────────────────────────── */
figure.svg { margin: 2em 0; text-align: center; }
figure.svg svg { max-width: 100%; height: auto; display: block; margin: 0 auto; }
figure.svg figcaption { margin-top: 10px; font-size: 12.5px; color: var(--ink-3); text-align: center; }
/* 图内统一用这套 class，自动跟随亮/暗主题 */
.dg-bg     { fill: var(--panel); }
.dg-sunk   { fill: var(--sunk); }
.dg-line   { stroke: var(--line-2); fill: none; }
.dg-hair   { stroke: var(--line); fill: none; }
.dg-ink    { fill: var(--ink); }
.dg-ink2   { fill: var(--ink-2); }
.dg-ink3   { fill: var(--ink-3); }
.dg-accent { fill: var(--accent); }
.dg-accent-s { fill: var(--accent-soft); }
.dg-term   { fill: var(--term); }
.dg-term-s { fill: var(--term-soft); }
.dg-stroke-accent { stroke: var(--accent); fill: none; }
.dg-stroke-term   { stroke: var(--term); fill: none; }
.dg-stroke-ink    { stroke: var(--ink-2); fill: none; }
figure.svg text { font-family: var(--f-sans); }
figure.svg .mono { font-family: var(--f-mono); }

/* 图表填充色：与 UI 文字色分开，按 dataviz 校验器跑过的两套值
   亮色 #b4530a / #00806a · 暗色 #cf7a2a / #1f9e80（含色盲分离度与对比度） */
:root { --dg-1: #b4530a; --dg-2: #00806a; --dg-grid: #e5e2dc; }
:root[data-theme="dark"] { --dg-1: #cf7a2a; --dg-2: #1f9e80; --dg-grid: #262b31; }
.dg-f1 { fill: var(--dg-1); } .dg-f2 { fill: var(--dg-2); }
.dg-s1 { stroke: var(--dg-1); fill: none; } .dg-s2 { stroke: var(--dg-2); fill: none; }
.dg-grid { stroke: var(--dg-grid); fill: none; }