/* ── 开抄 · 索引卡工作台 ───────────────────────────
   冷纸白 + 墨黑 + 钴蓝一支笔；分类色只做功能编码（色条/色点）。
   单一圆角刻度、发丝线分区、无阴影无渐变（hero 演示卡除外的一处彩色）。 */

:root {
  --paper: #F5F5F1;
  --paper-raise: #FCFCFA;
  --ink: #191A1C;
  --ink-2: #5C5D63;
  --ink-3: #9A9A9F;
  --line: #E2E1DB;
  --line-strong: #C9C8C1;
  --accent: #233AF2;
  --accent-ink: #fff;
  --r: 10px;
  --font-display: "Bricolage Grotesque", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.mono { font-family: var(--font-mono); }
a { color: inherit; }
button { font-family: inherit; font-size: inherit; cursor: pointer; }
h1, h2, h3 { font-family: var(--font-display); margin: 0; line-height: 1.25; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
::selection { background: #C9D0FF; }

/* ── 顶栏 ─────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 20px; height: 60px; }
.wordmark { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.wordmark-badge {
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--accent); color: #fff;
  display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 800; font-size: 16px;
}
.wordmark-text { font-weight: 700; font-family: var(--font-display); font-size: 17px; letter-spacing: .01em; }
.wordmark-text i { font-style: normal; font-weight: 400; color: var(--ink-2); font-size: 13px; margin-left: 6px; }

.search-box {
  margin-left: auto;
  display: flex; align-items: center; gap: 8px;
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0 6px 0 14px;
  height: 38px; width: 320px;
  transition: border-color .15s;
}
.search-box:focus-within { border-color: var(--ink); }
.icon-search { color: var(--ink-3); flex: none; }
#search {
  flex: 1; border: 0; background: none; outline: none;
  font-family: var(--font-body); font-size: 14px; color: var(--ink); min-width: 0;
}
#search::placeholder { color: var(--ink-3); }
#search-kbd {
  flex: none; font-family: var(--font-mono); font-size: 11px; color: var(--ink-3);
  border: 1px solid var(--line); border-radius: 5px; padding: 1px 7px; background: var(--paper);
}

/* ── Hero ─────────────────────────────── */
.hero {
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: 48px; align-items: center;
  padding: 72px 0 56px;
}
.hero-copy h1 {
  font-size: clamp(34px, 4.6vw, 56px);
  font-weight: 800; letter-spacing: -0.015em;
  animation: rise .6s cubic-bezier(.22,1,.36,1) both;
}
.hero-copy h1 .ai {
  font-family: var(--font-display);
  color: var(--accent);
  position: relative; white-space: nowrap;
}
.hero-copy h1 .ai::after {
  content: ""; position: absolute; left: -2%; right: -2%; bottom: .06em; height: .14em;
  background: var(--accent); opacity: .25; border-radius: 2px;
}
.hero-sub { color: var(--ink-2); margin: 18px 0 0; font-size: 16px; animation: rise .6s .08s cubic-bezier(.22,1,.36,1) both; }
.hero-stats { display: flex; align-items: center; gap: 12px; margin: 22px 0 0; font-size: 14px; color: var(--ink-2); animation: rise .6s .14s cubic-bezier(.22,1,.36,1) both; }
.hero-stats b { font-family: var(--font-display); font-size: 20px; color: var(--ink); font-weight: 700; }
.dot { width: 4px; height: 4px; border-radius: 50%; background: var(--line-strong); }
.hero-note { margin: 10px 0 0; font-size: 13px; color: var(--ink-3); animation: rise .6s .2s cubic-bezier(.22,1,.36,1) both; }

/* hero 演示卡：整站唯一的「叠放 + 彩色」一刻 */
.hero-demo { position: relative; min-height: 300px; animation: settle .7s cubic-bezier(.22,1,.36,1) both; }
.demo-card {
  position: absolute; inset: 0 8% 12% 0;
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
  display: flex; flex-direction: column; gap: 10px;
}
.demo-front { transform: rotate(2.6deg); box-shadow: 0 1px 0 var(--line); }
.demo-back {
  inset: 6% 0 4% 10%;
  background: #EFEFEA;
  transform: rotate(-2deg);
  display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 700; color: var(--ink-3); font-size: 15px;
}
.demo-bar { display: flex; align-items: center; gap: 10px; }
.demo-en { font-family: var(--font-mono); font-size: 12px; color: var(--ink-3); }
.demo-card h3 { font-size: 19px; font-weight: 700; }
.demo-card p { margin: 0; color: var(--ink-2); font-size: 14px; flex: 1; }
.demo-copy {
  align-self: flex-start;
  border: 1px solid var(--ink); background: none; border-radius: 999px;
  padding: 6px 16px; font-size: 13px; font-weight: 500;
  transition: background .15s, color .15s;
}
.demo-copy:hover { background: var(--ink); color: #fff; }

@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes settle { from { opacity: 0; transform: rotate(5deg) translateY(18px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* ── 筛选条 ─────────────────────────────── */
.filter-bar {
  position: sticky; top: 60px; z-index: 30;
  display: flex; flex-wrap: wrap; gap: 8px;
  padding: 14px 0;
  margin: 0 -24px; padding-left: 24px; padding-right: 24px;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.chip {
  --c: var(--ink);
  display: inline-flex; align-items: center; gap: 7px;
  border: 1px solid var(--line); background: var(--paper-raise);
  border-radius: 999px; padding: 5px 14px 5px 11px;
  font-size: 13.5px; color: var(--ink);
  transition: border-color .15s, background .15s;
}
.chip::before { content: ""; width: 8px; height: 8px; border-radius: 3px; background: var(--c); flex: none; }
.chip b { font-weight: 500; color: var(--ink-3); font-size: 12px; }
.chip:hover { border-color: var(--line-strong); }
.chip.is-on { background: var(--ink); border-color: var(--ink); color: #fff; }
.chip.is-on b { color: rgba(255,255,255,.55); }

/* ── 案例网格 ─────────────────────────────── */
.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding: 28px 0 64px;
}
.card {
  --c: var(--ink);
  background: var(--paper-raise);
  border: 1px solid var(--line);
  border-top: 3px solid var(--c);
  border-radius: var(--r);
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--line-strong); border-top-color: var(--c); }
.card > .pv { flex: none; border-bottom: 1px solid var(--line); }
.card-body { padding: 13px 16px 12px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.card-cat { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--ink-2); }
.card-cat::before { content: ""; width: 7px; height: 7px; border-radius: 2px; background: var(--c); }
.card-en { font-family: var(--font-mono); font-size: 11px; color: var(--ink-2); }
.card h3 { font-size: 17px; font-weight: 700; letter-spacing: -0.01em; cursor: pointer; }
.card h3:hover { color: var(--accent); }
.card-scene {
  margin: 0; color: var(--ink-2); font-size: 13.5px; line-height: 1.65;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-2);
  border: 1px solid var(--line); border-radius: 5px; padding: 1px 8px;
}
.card-foot { display: flex; align-items: center; gap: 8px; margin-top: auto; padding-top: 4px; }
.btn {
  border-radius: 999px; padding: 6px 16px; font-size: 13px; font-weight: 500;
  border: 1px solid var(--ink); background: none; color: var(--ink);
  transition: background .15s, color .15s, opacity .15s;
}
.btn:hover { background: var(--ink); color: #fff; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { background: #1A2BD0; border-color: #1A2BD0; }
.btn.ghost { border-color: var(--line-strong); color: var(--ink-2); }
.btn.ghost:hover { background: none; color: var(--ink); border-color: var(--ink); }
.icon-btn {
  margin-left: auto;
  width: 32px; height: 32px; border-radius: 8px;
  border: 1px solid transparent; background: none; color: var(--ink-3);
  display: grid; place-items: center;
  transition: color .15s, border-color .15s;
}
.icon-btn:hover { color: var(--ink); border-color: var(--line); }
.icon-btn.is-starred { color: #EAB308; }

.empty { grid-column: 1 / -1; text-align: center; color: var(--ink-2); padding: 60px 0; }

/* ── 怎么用 ─────────────────────────────── */
.howto { border-top: 1px solid var(--line); padding: 48px 0 64px; }
.howto h2 { font-size: 24px; font-weight: 700; margin-bottom: 24px; }
.howto-steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; counter-reset: step; }
.howto-steps li { counter-increment: step; display: flex; flex-direction: column; gap: 8px; }
.howto-steps li::before {
  content: "0" counter(step);
  font-family: var(--font-display); font-weight: 800; font-size: 15px; color: var(--accent);
}
.howto-steps b { font-size: 16px; }
.howto-steps span { color: var(--ink-2); font-size: 14px; }
.howto-tip {
  margin: 32px 0 0; padding: 14px 18px;
  border-left: 3px solid var(--accent);
  background: var(--paper-raise); border-radius: 0 8px 8px 0;
  color: var(--ink-2); font-size: 14px;
}

/* ── 页脚 ─────────────────────────────── */
.site-footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--ink-3); font-size: 13px; }
.site-footer p { margin: 4px 0; }
.site-footer a { color: var(--ink-2); }

/* ── 弹层 ─────────────────────────────── */
.modal { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: 24px; }
.modal[hidden] { display: none; }
.modal-mask { position: absolute; inset: 0; background: rgba(25, 26, 28, .45); animation: fade .2s both; }
.modal-card {
  position: relative; width: min(760px, 100%); max-height: calc(100vh - 48px);
  background: var(--paper); border-radius: 16px;
  border: 1px solid var(--line-strong);
  padding: 26px 26px 20px;
  display: flex; flex-direction: column; gap: 14px;
  animation: pop .25s cubic-bezier(.22,1,.36,1) both;
  overflow: hidden;
}
.modal-preview { margin: -26px -26px 0; flex: none; }
.modal-preview:empty { display: none; }
.modal-preview + .modal-head { margin-top: 16px; }
.modal-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.modal-meta { display: flex; align-items: center; gap: 10px; margin: 0 0 6px; }
.modal-meta .chip { padding: 3px 11px 3px 9px; font-size: 12.5px; }
#modal-en { font-size: 12px; color: var(--ink-3); }
.modal-head h2 { font-size: 24px; font-weight: 700; }
.modal-scene { margin: 0; color: var(--ink-2); font-size: 14px; }
.prompt-block {
  margin: 0; flex: 1; overflow: auto;
  background: var(--paper-raise); border: 1px solid var(--line); border-radius: 10px;
  padding: 18px 20px;
  font-family: var(--font-mono); font-size: 13px; line-height: 1.8;
  white-space: pre-wrap; word-break: break-word;
  max-height: 52vh;
}
.modal-foot { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.hint { color: var(--ink-3); font-size: 13px; }
@keyframes fade { from { opacity: 0; } }
@keyframes pop { from { opacity: 0; transform: scale(.96) translateY(8px); } }

/* ── 顶栏定制按钮 ─────────────────────────────── */
.gen-open {
  position: relative;
  height: 38px; padding: 0 16px;
  border: 1px solid var(--line); border-radius: 999px;
  background: var(--paper-raise); color: var(--ink);
  font-size: 13.5px; font-weight: 500;
  transition: border-color .15s;
  flex: none;
}
.gen-open:hover { border-color: var(--ink); }
.gen-open.is-on::after {
  content: ""; position: absolute; top: 9px; right: 9px;
  width: 7px; height: 7px; border-radius: 50%;
  background: #2FA35C; border: 1.5px solid var(--paper-raise);
}
.hero-note a { color: var(--accent); }

/* ── 定制抽屉 ─────────────────────────────── */
.gen { position: fixed; inset: 0; z-index: 55; }
.gen[hidden] { display: none; }
.gen-mask { position: absolute; inset: 0; background: rgba(25, 26, 28, .45); animation: fade .2s both; }
.gen-panel {
  position: absolute; right: 0; top: 0; bottom: 0;
  width: min(420px, 100%);
  background: var(--paper); border-left: 1px solid var(--line-strong);
  display: flex; flex-direction: column;
  animation: genIn .28s cubic-bezier(.22, 1, .36, 1) both;
}
@keyframes genIn { from { transform: translateX(40px); opacity: 0; } }
.gen-head {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 12px;
  padding: 22px 24px 14px; border-bottom: 1px solid var(--line);
}
.gen-head h2 { font-size: 20px; font-weight: 700; }
.gen-head p { margin: 6px 0 0; color: var(--ink-2); font-size: 13.5px; }
.gen-body { flex: 1; overflow-y: auto; padding: 18px 24px; }
.gen-foot {
  display: flex; justify-content: flex-end; gap: 10px;
  padding: 14px 24px; border-top: 1px solid var(--line);
}
.f { display: flex; flex-direction: column; gap: 6px; margin-bottom: 15px; }
.f > span { font-size: 12.5px; color: var(--ink-2); font-weight: 500; }
.f input, .f select {
  height: 40px; padding: 0 12px;
  border: 1px solid var(--line); border-radius: 9px;
  background: var(--paper-raise); color: var(--ink);
  font-family: var(--font-body); font-size: 14px;
  transition: border-color .15s;
}
.f input:focus, .f select:focus { outline: none; border-color: var(--ink); }
.f input[type="color"] { width: 52px; padding: 3px; height: 40px; cursor: pointer; }
.f input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
.f input[type="color"]::-webkit-color-swatch { border: 1px solid var(--line); border-radius: 6px; }
.f-row { display: flex; gap: 8px; }
.f-row input[type="text"] { flex: 1; font-family: var(--font-mono); font-size: 13px; }

/* ── 弹层：版本切换 + A/B 对比 ─────────────────────── */
.modal-card {
  overflow-y: auto;
}
.seg-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.seg {
  display: inline-flex; gap: 2px; padding: 3px;
  border: 1px solid var(--line); border-radius: 999px; background: var(--paper-raise);
}
.seg-btn {
  border: 0; background: none; padding: 5px 15px; border-radius: 999px;
  font-size: 13px; color: var(--ink-2); font-weight: 500;
  transition: background .15s, color .15s;
}
.seg-btn.is-on { background: var(--ink); color: #fff; }
.seg-edit { border: 0; background: none; color: var(--accent); font-size: 13px; }
.seg-edit:hover { text-decoration: underline; }
.ab { margin-top: -2px; }
.ab-toggle {
  border: 0; background: none; padding: 0;
  color: var(--ink-2); font-size: 13.5px;
}
.ab-toggle:hover { color: var(--ink); text-decoration: underline; }
.ab-body { margin-top: 10px; animation: rise .3s cubic-bezier(.22, 1, .36, 1) both; }
.ab-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.ab-col { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--paper-raise); }
.ab-col header {
  padding: 7px 12px; font-size: 12.5px; font-weight: 500;
  color: var(--ink-2); background: #F1F1EC; border-bottom: 1px solid var(--line);
}
.ab-col.good header { color: var(--c); background: color-mix(in srgb, var(--c) 10%, #fff); }
.ab-col pre {
  margin: 0; padding: 12px; max-height: 200px; overflow: auto;
  font-family: var(--font-mono); font-size: 12px; line-height: 1.7;
  white-space: pre-wrap; word-break: break-word;
}
.ab-why {
  margin-top: 10px; padding: 12px 16px;
  border-left: 3px solid var(--c); background: var(--paper-raise);
  border-radius: 0 8px 8px 0;
}
.ab-why b { font-size: 13px; }
.ab-why ul { margin: 8px 0 0; padding-left: 18px; }
.ab-why li { font-size: 13px; color: var(--ink-2); margin-bottom: 4px; }
@media (max-width: 640px) {
  .ab-cols { grid-template-columns: 1fr; }
  .search-box { width: auto; flex: 1; }
  .gen-panel { width: 100%; }
}

/* ── Toast ─────────────────────────────── */
.toast {
  position: fixed; left: 50%; bottom: 32px; z-index: 60;
  transform: translate(-50%, 16px); opacity: 0; pointer-events: none;
  background: var(--ink); color: #fff;
  border-radius: 999px; padding: 9px 20px;
  font-size: 14px;
  transition: transform .25s cubic-bezier(.22,1,.36,1), opacity .25s;
}
.toast.show { transform: translate(-50%, 0); opacity: 1; }

/* ── 响应式 ─────────────────────────────── */
@media (max-width: 1024px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; padding: 48px 0 40px; }
  .hero-demo { display: none; }
  .search-box { width: auto; flex: 1; min-width: 0; }
  .header-inner { gap: 10px; }
  .wordmark-text i { display: none; }
}
@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
  .filter-bar { top: 60px; }
  .howto-steps { grid-template-columns: 1fr; gap: 18px; }
  .modal-card { padding: 18px; }
  .modal-foot { flex-direction: column-reverse; align-items: stretch; text-align: center; }
}