/* ============================================================
   apps/chengyu-migong.html · 宣纸 + 朱砂
   — 新国风：克制朱砂、青墨、米白、鎏金；中文衬线/楷体
   - 与 sokoban（仓库）/ euler-draw（蓝图）刻意拉开
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
/* body 用 min-height（而非 height:100%）：让 body 高度随内容增长，保证 sticky 顶栏全程有效 */
html { height: 100%; }
body { min-height: 100%; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 20% 0%, rgba(184, 51, 42, 0.04), transparent 60%),
    radial-gradient(900px 500px at 80% 100%, rgba(201, 161, 74, 0.06), transparent 60%),
    linear-gradient(180deg, #faf5e6 0%, #f4ecd8 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: inherit; text-decoration: none; }

:root {
  /* —— 宣纸底色 —— */
  --paper:        #f4ecd8;
  --paper-deep:   #e8dcb8;
  --paper-line:   #c8b48a;
  --paper-line-hi:#a08858;

  /* —— 文字 —— */
  --ink:          #2b2419;
  --ink-soft:     #6b5e4a;
  --ink-mute:     #9c8f74;
  --ink-faint:    #c8b896;

  /* —— 朱砂 / 鎏金 —— */
  --vermilion:    #b8332a;
  --vermilion-hi: #d44a3f;
  --vermilion-soft:rgba(184, 51, 42, 0.14);
  --gold:         #c9a14a;
  --gold-hi:      #e8c074;
  --gold-soft:    rgba(201, 161, 74, 0.18);

  /* —— 状态 —— */
  --ok:           #6b8e23;
  --warn:         #c9a14a;
  --bad:          #b8332a;

  /* —— 字体 —— */
  --font-display: 'Ma Shan Zheng', 'Noto Serif SC', 'Source Han Serif SC', 'KaiTi', 'STKaiti', serif;
  --font-body:    'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono:    'JetBrains Mono', 'IBM Plex Mono', 'SF Mono', Consolas, monospace;

  --shadow:       0 1px 0 rgba(0, 0, 0, 0.04), 0 6px 18px rgba(122, 31, 21, 0.06);
  --shadow-hi:    0 8px 30px rgba(184, 51, 42, 0.12), 0 1px 0 rgba(255, 255, 255, 0.5);
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 0 40px 40px;
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}

.back-link { padding: 18px 40px 0; font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-mute); display: inline-block; }
.back-link:hover { color: var(--vermilion); }

/* ====== HERO ====== */
.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
  align-items: center;
  padding: 28px 32px;
  background:
    linear-gradient(180deg, rgba(244, 236, 216, 0.6), rgba(232, 220, 184, 0.4)),
    repeating-linear-gradient(0deg, transparent 0, transparent 27px, rgba(160, 136, 88, 0.04) 27px, rgba(160, 136, 88, 0.04) 28px),
    repeating-linear-gradient(90deg, transparent 0, transparent 27px, rgba(160, 136, 88, 0.04) 27px, rgba(160, 136, 88, 0.04) 28px);
  border: 1px solid rgba(160, 136, 88, 0.2);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.hero-meta { display: flex; flex-direction: column; gap: 6px; }
.eyebrow { font-size: 11px; letter-spacing: 0.4em; color: var(--vermilion); font-weight: 800; }
.hero h1 {
  font-family: var(--font-display);
  font-size: 56px;
  line-height: 1.1;
  letter-spacing: 0.08em;
  color: var(--ink);
  margin: 0;
}
.h1-en { font-size: 12px; letter-spacing: 0.3em; color: var(--ink-mute); font-weight: 600; }
.hero .sub { margin-top: 8px; font-size: 14px; color: var(--ink-soft); max-width: 540px; line-height: 1.6; }
.hero-deco { width: 200px; height: 200px; flex-shrink: 0; }
.deco-svg { width: 100%; height: 100%; }

/* ====== 模式选择 ====== */
.mode-bar {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 0 4px;
}
.mode-pills { display: flex; gap: 8px; flex-wrap: wrap; }
.mode-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--paper);
  border: 1px solid rgba(160, 136, 88, 0.3);
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 0.2s;
}
.mode-pill:hover { border-color: var(--vermilion); color: var(--ink); }
.mode-pill.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.mode-pill .m-ico { font-size: 12px; opacity: 0.7; }
.mode-pill .m-desc { font-size: 11px; opacity: 0.6; }

.diff-row { display: flex; gap: 6px; flex-wrap: wrap; }
.diff-pill {
  padding: 6px 14px;
  border-radius: 6px;
  background: transparent;
  border: 1px dashed rgba(160, 136, 88, 0.4);
  color: var(--ink-mute);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.diff-pill:hover { border-style: solid; color: var(--ink); }
.diff-pill.active {
  background: var(--vermilion-soft);
  border: 1px solid var(--vermilion);
  color: var(--vermilion);
  font-weight: 700;
}

/* ====== 棋盘区 ====== */
.stage-area, .chain-area {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 18px;
}
.chain-area {
  grid-template-columns: minmax(0, 1fr);
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
}
.stage-card, .chain-card {
  background: var(--paper);
  border: 1px solid rgba(160, 136, 88, 0.3);
  border-radius: 10px;
  padding: 16px;
  box-shadow: var(--shadow);
  position: relative;
}
.stage-head, .chain-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.stage-pill {
  display: inline-block;
  padding: 4px 10px;
  background: var(--vermilion-soft);
  color: var(--vermilion);
  font-size: 12px;
  font-weight: 700;
  border-radius: 4px;
  border: 1px solid var(--vermilion);
}
.stage-mode { font-size: 11px; color: var(--ink-mute); letter-spacing: 0.2em; margin-left: 8px; }
.stage-head .info { font-size: 12px; color: var(--ink-soft); }
.stage-head .info b { color: var(--vermilion); font-weight: 800; font-size: 14px; }

.board-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-height: 520px;
  background:
    radial-gradient(circle at 30% 30%, rgba(244, 236, 216, 0.6), transparent 60%),
    var(--paper-deep);
  border-radius: 6px;
  border: 1px solid rgba(160, 136, 88, 0.2);
  overflow: hidden;
}
.board { display: block; width: 100%; height: 100%; }

.status-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(244, 236, 216, 0.85);
  backdrop-filter: blur(2px);
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.2s;
}
.status-overlay.hide { opacity: 0; pointer-events: none; }
.so-msg { font-family: var(--font-display); font-size: 22px; color: var(--ink); }
.so-sub { font-size: 12px; color: var(--ink-mute); margin-top: 4px; letter-spacing: 0.1em; }

.hud-strip {
  display: flex;
  gap: 16px;
  margin-top: 12px;
  padding: 10px 14px;
  background: var(--paper-deep);
  border-radius: 6px;
  border: 1px solid rgba(160, 136, 88, 0.2);
}
.hs-item { display: flex; align-items: baseline; gap: 6px; font-size: 12px; }
.hs-item .hs-l { color: var(--ink-mute); letter-spacing: 0.15em; font-size: 10px; text-transform: uppercase; }
.hs-item b { color: var(--ink); font-weight: 800; font-size: 14px; font-family: var(--font-mono); }
.hs-item[data-status="error"] b { color: var(--vermilion); }
.hs-item[data-status="ok"] b { color: var(--ok); }

/* ====== 工作台（线索面板） ====== */
.workbench {
  background: var(--paper);
  border: 1px solid rgba(160, 136, 88, 0.3);
  border-radius: 10px;
  padding: 16px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  max-height: 720px;
}
.wb-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--ink-mute);
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(160, 136, 88, 0.3);
  margin-bottom: 10px;
}
.wb-toggle { background: transparent; border: 0; color: var(--ink-mute); font-size: 11px; cursor: pointer; }
.wb-toggle:hover { color: var(--vermilion); }
.wb-body.collapsed { display: none; }

.clue-list { display: flex; flex-direction: column; gap: 8px; max-height: 360px; overflow-y: auto; }
.clue-empty { color: var(--ink-mute); font-size: 12px; padding: 24px 0; text-align: center; }
.clue-card {
  padding: 10px 12px;
  background: rgba(244, 236, 216, 0.4);
  border: 1px solid rgba(160, 136, 88, 0.2);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}
.clue-card:hover { border-color: var(--vermilion); background: rgba(184, 51, 42, 0.04); }
.clue-card .clue-tag {
  display: inline-block;
  padding: 1px 6px;
  font-size: 10px;
  border-radius: 3px;
  margin-right: 4px;
  background: var(--vermilion-soft);
  color: var(--vermilion);
}
.clue-card .clue-tag[data-type="source"] { background: var(--gold-soft); color: var(--gold); }
.clue-card .clue-tag[data-type="riddle"] { background: rgba(107, 94, 74, 0.18); color: var(--ink-soft); }
.clue-card .clue-text { font-size: 13px; color: var(--ink); line-height: 1.5; }
.clue-card .clue-locked {
  font-size: 11px;
  color: var(--ink-mute);
  font-style: italic;
}

.hint-line {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  padding: 10px 12px;
  margin-top: 10px;
  background: var(--gold-soft);
  border-radius: 6px;
  font-size: 12px;
  color: var(--ink-soft);
  line-height: 1.5;
}
.hint-line .ico { font-size: 14px; flex-shrink: 0; }
.hint-line .txt { flex: 1; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}
.btn {
  padding: 8px 14px;
  border-radius: 4px;
  background: var(--paper-deep);
  border: 1px solid rgba(160, 136, 88, 0.3);
  color: var(--ink);
  font-size: 12px;
  cursor: pointer;
  font-family: var(--font-body);
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn:hover:not(:disabled) { border-color: var(--vermilion); color: var(--vermilion); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-primary:hover:not(:disabled) { background: var(--vermilion); border-color: var(--vermilion); color: #fff; }
.btn-ghost { background: transparent; }
.btn .cost { font-size: 10px; opacity: 0.6; font-family: var(--font-mono); }

/* ====== 接龙工作台 ====== */
.chain-card { padding: 20px; }
.chain-start {
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: 0.2em;
  color: var(--vermilion);
  margin-top: 8px;
}
.chain-stream {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 16px 0;
  min-height: 40px;
  padding: 12px;
  background: rgba(244, 236, 216, 0.4);
  border: 1px dashed rgba(160, 136, 88, 0.3);
  border-radius: 6px;
  align-items: center;
}
.chain-stream .chip {
  padding: 4px 10px;
  background: var(--paper);
  border: 1px solid rgba(160, 136, 88, 0.3);
  border-radius: 4px;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.1em;
  color: var(--ink);
}
.chain-stream .arrow { color: var(--ink-mute); font-size: 12px; }
.chain-empty { color: var(--ink-mute); font-size: 12px; }
.chain-input-row {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}
.chain-input-row input {
  flex: 1;
  padding: 10px 14px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.2em;
  background: var(--paper);
  border: 1px solid rgba(160, 136, 88, 0.4);
  border-radius: 4px;
  color: var(--ink);
  outline: none;
  text-align: center;
}
.chain-input-row input:focus { border-color: var(--vermilion); }
.chain-input-row input.shake { animation: shake 0.3s; border-color: var(--vermilion); }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}
.chain-feedback {
  min-height: 20px;
  font-size: 12px;
  color: var(--ink-mute);
  margin-bottom: 8px;
}
.chain-feedback.error { color: var(--vermilion); }
.chain-feedback.ok { color: var(--ok); }

/* ====== 弹窗 ====== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(43, 36, 25, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal[hidden] { display: none; }
.modal-card {
  background: var(--paper);
  border: 1px solid var(--vermilion);
  border-radius: 12px;
  padding: 28px 32px;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 12px 40px rgba(184, 51, 42, 0.3);
  text-align: center;
}
.modal-eyebrow {
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--vermilion);
  font-weight: 800;
  margin-bottom: 6px;
}
.modal-title {
  font-family: var(--font-display);
  font-size: 28px;
  color: var(--ink);
  margin-bottom: 12px;
}
.modal-stars {
  display: flex;
  gap: 8px;
  justify-content: center;
  font-size: 32px;
  color: var(--gold);
  margin: 12px 0;
}
.modal-stars .star.off { color: rgba(201, 161, 74, 0.3); }
.modal-stats {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin: 16px 0;
}
.modal-stats > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.modal-stats .l {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
  text-transform: uppercase;
}
.modal-stats b { font-family: var(--font-mono); font-size: 18px; color: var(--ink); font-weight: 800; }
.modal-desc {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 12px 0 20px;
  line-height: 1.5;
}
.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}

/* ====== Toast ====== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 20px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 4px;
  font-size: 13px;
  z-index: 2000;
  box-shadow: var(--shadow-hi);
  animation: toast-in 0.3s;
}
.toast.error { background: var(--vermilion); color: #fff; }
@keyframes toast-in {
  from { transform: translateX(-50%) translateY(20px); opacity: 0; }
  to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

/* ====== 棋盘 SVG 内部 ====== */
.board .grid-cell { fill: var(--paper); stroke: var(--paper-line); stroke-width: 0.5; }
.board .grid-cell.entry { fill: var(--gold-soft); }
.board .grid-cell.exit  { fill: var(--vermilion-soft); }
.board .grid-cell.filled { fill: rgba(184, 51, 42, 0.06); }
.board .grid-cell.hint   { fill: var(--gold-soft); }
.board .entry-mark { fill: var(--gold); font-family: var(--font-display); font-size: 14px; }
.board .exit-mark  { fill: var(--vermilion); font-family: var(--font-display); font-size: 14px; }
.board .grid-cell.entry-cell { stroke: var(--gold); stroke-width: 1; }
.board .grid-cell.exit-cell { stroke: var(--vermilion); stroke-width: 1; }
.board .char-text.pre-filled { fill: var(--vermilion); font-weight: 700; cursor: default; }
.board .char-text.pre-filled:hover { fill: var(--vermilion); }
.board .char-text {
  font-family: var(--font-display);
  font-size: 22px;
  fill: var(--ink);
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
}
.board .char-text.revealed { fill: var(--vermilion); font-weight: 700; }
.board .link-path {
  fill: none;
  stroke: var(--gold);
  stroke-width: 3;
  stroke-dasharray: 4 3;
  opacity: 0;
  transition: opacity 0.4s;
}
.board .link-path.show { opacity: 1; }
.board .idiom-tag {
  font-family: var(--font-body);
  font-size: 9px;
  fill: var(--ink-mute);
  pointer-events: none;
}

/* ====== 响应式 ====== */
@media (max-width: 900px) {
  .stage-area, .chain-area { grid-template-columns: 1fr; }
  .hero { grid-template-columns: 1fr; }
  .hero-deco { width: 160px; height: 160px; }
  .hero h1 { font-size: 40px; }
  main { padding: 0 20px 32px; }
}