:root {
  --paper: #f4ecd8;
  --paper-2: #ebe0c4;
  --paper-3: #fbf6e9;
  --ink: #2b2622;
  --ink-soft: #6b6157;
  --ink-faint: #a89c8a;
  --red: #b0392b;
  --red-soft: #d9806f;
  --green: #4d6b53;
  --gold: #b8893b;
  --cs: 44px; /* 词块单字尺寸 */
  --font: "LXGW WenKai", "STKaiti", "KaiTi", "楷体", "Songti SC", serif;
}
@media (max-width: 520px) { :root { --cs: 34px; } }

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(ellipse at 20% 0%, rgba(255,255,255,.55), transparent 60%),
    radial-gradient(ellipse at 100% 100%, rgba(184,137,59,.12), transparent 55%),
    var(--paper);
  min-height: 100%;
  overscroll-behavior: none;
}
button { font-family: inherit; color: inherit; cursor: pointer; }
#app { max-width: 760px; margin: 0 auto; padding: 16px 16px 40px; min-height: 100vh; }

/* ---------- 首页 ---------- */
.home-head { text-align: center; padding: 28px 0 12px; position: relative; }
.home-head h1 { font-size: 52px; margin: 0; letter-spacing: .25em; font-weight: 700; padding-left: .25em; }
.home-head p { color: var(--ink-soft); margin: 8px 0 0; letter-spacing: .1em; }
.seal {
  display: inline-block; background: var(--red); color: var(--paper-3);
  font-size: 13px; padding: 4px 6px; border-radius: 3px; letter-spacing: 0;
  writing-mode: vertical-rl; vertical-align: top; margin-left: 6px; line-height: 1.1;
  transform: rotate(4deg); box-shadow: 0 0 0 2px var(--paper), 0 0 0 3px var(--red);
}
.levels { display: flex; justify-content: center; gap: 0; margin: 22px auto 26px; width: fit-content;
  border: 1.5px solid var(--ink); border-radius: 999px; overflow: hidden; }
.levels button { border: 0; background: transparent; padding: 8px 22px; font-size: 17px; }
.levels button + button { border-left: 1.5px solid var(--ink); }
.levels button.on { background: var(--ink); color: var(--paper); }
.levels-note { text-align: center; color: var(--ink-soft); font-size: 14px; margin-top: -16px; margin-bottom: 22px; }

.modes { display: grid; gap: 16px; }
.mode {
  position: relative; display: grid; grid-template-columns: 76px 1fr; gap: 16px; align-items: center;
  text-align: left; padding: 18px 20px; border: 0; border-radius: 6px;
  background: var(--paper-3); box-shadow: 0 1px 0 rgba(0,0,0,.05), 0 6px 18px -8px rgba(60,40,10,.35);
  transition: transform .15s, box-shadow .15s;
}
.mode:hover { transform: translateY(-2px); box-shadow: 0 1px 0 rgba(0,0,0,.05), 0 12px 24px -10px rgba(60,40,10,.45); }
.mode .glyph {
  width: 76px; height: 76px; display: grid; place-items: center; font-size: 40px;
  border: 1.5px solid var(--ink); border-radius: 4px; background: var(--paper);
}
.mode h2 { margin: 0 0 4px; font-size: 24px; letter-spacing: .1em; }
.mode p { margin: 0; color: var(--ink-soft); font-size: 15px; line-height: 1.6; }
.mode .best { position: absolute; right: 14px; top: 12px; font-size: 13px; color: var(--gold); }
.mode-opt { display: flex; gap: 8px; align-items: center; margin-top: 8px; font-size: 14px; color: var(--ink-soft); }
.switch { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--ink-faint); background: transparent; font-size: 13px; }
.switch.on { background: var(--green); color: var(--paper-3); border-color: var(--green); }
.home-foot { text-align: center; color: var(--ink-faint); font-size: 13px; margin-top: 30px; line-height: 1.8; }

/* ---------- 游戏外壳 ---------- */
.hud { display: flex; align-items: center; gap: 12px; padding: 4px 0 14px; border-bottom: 1px solid rgba(43,38,34,.15); margin-bottom: 16px; }
.hud .back { border: 0; background: none; font-size: 22px; padding: 4px 8px 4px 0; }
.hud .title { font-size: 20px; letter-spacing: .1em; }
.hud .lv { font-size: 13px; color: var(--paper-3); background: var(--ink-soft); padding: 1px 8px; border-radius: 3px; }
.hud .stats { margin-left: auto; display: flex; gap: 14px; font-size: 15px; align-items: center; }
.hud .lives { color: var(--red); letter-spacing: 2px; }
.hud .score b { font-size: 20px; color: var(--red); }
.hud .streak { color: var(--gold); }

.prompt { text-align: center; margin: 4px 0 14px; }
.prompt .known { font-size: 30px; letter-spacing: .18em; padding-left: .18em; }
.prompt .ask { display: block; color: var(--ink-soft); font-size: 15px; margin-top: 4px; letter-spacing: .1em; }
.prompt .badge { display: inline-block; font-size: 12px; color: var(--red); border: 1px solid var(--red); border-radius: 3px; padding: 0 6px; margin-left: 6px; vertical-align: middle; letter-spacing: 0; }
.prompt .src { color: var(--gold); font-size: 15px; margin-top: 6px; }
.prompt .emoji { font-size: 54px; line-height: 1.25; letter-spacing: .08em; font-family: "Segoe UI Emoji", "Apple Color Emoji", "Noto Color Emoji", sans-serif; word-break: break-all; }

/* 答案槽 */
.slots { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; min-height: 52px; margin: 6px 0 14px; }
.slot {
  width: 46px; height: 46px; display: grid; place-items: center; font-size: 28px;
  border: 1.5px dashed var(--ink-faint); border-radius: 4px; background: rgba(255,255,255,.35);
}
.slot.filled { border-style: solid; border-color: var(--ink); background: var(--paper-3); }
.slot.chip-start { cursor: pointer; }
.slots.ok .slot { border-color: var(--green); color: var(--green); background: #eef2e6; }
@media (max-width: 520px) { .slot { width: 38px; height: 38px; font-size: 24px; } }

.tools { display: flex; justify-content: center; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.btn {
  border: 1.5px solid var(--ink); background: transparent; border-radius: 4px;
  padding: 7px 16px; font-size: 16px; letter-spacing: .1em;
}
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--ink); color: var(--paper); }
.btn.red { border-color: var(--red); color: var(--red); }
.btn small { font-size: 12px; color: var(--ink-faint); letter-spacing: 0; }

/* ---------- 叠字寻句 ---------- */
.board {
  position: relative; width: 100%; height: clamp(360px, 54vh, 560px);
  border-radius: 6px; overflow: hidden; touch-action: none;
  background:
    repeating-linear-gradient(90deg, rgba(120,90,40,.05) 0 1px, transparent 1px 60px),
    var(--paper-2);
  box-shadow: inset 0 2px 10px rgba(60,40,10,.18);
}
.tile {
  position: absolute; display: flex; gap: 0; padding: 4px; user-select: none; touch-action: none;
  background: var(--tint, var(--paper-3)); border: 1px solid rgba(43,38,34,.35); border-radius: 3px;
  box-shadow: 0 2px 4px rgba(40,25,5,.25), 0 0 0 3px rgba(255,255,255,.25) inset;
  transform: rotate(var(--r, 0deg)); cursor: grab; transition: box-shadow .15s, transform .15s;
}
.tile.v { flex-direction: column; }
.tile span { width: var(--cs); height: var(--cs); display: grid; place-items: center; font-size: calc(var(--cs) * .72); line-height: 1; }
.tile.dragging { cursor: grabbing; box-shadow: 0 10px 22px rgba(40,25,5,.4); transform: rotate(var(--r, 0deg)) scale(1.06); }
.tile.glow { box-shadow: 0 0 0 3px var(--gold), 0 0 22px 6px rgba(184,137,59,.8); animation: pulse 1s ease-in-out 3; }
.tile.nope { animation: shake .35s; }
@keyframes pulse { 50% { transform: rotate(var(--r)) scale(1.12); } }

.tray { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 6px; min-height: 56px; margin: 0 0 14px; }
.chip {
  display: flex; border: 1.5px solid var(--ink); border-radius: 3px; background: var(--paper-3);
  font-size: 26px; cursor: pointer; padding: 2px 4px;
}
.chip span { width: 36px; height: 40px; display: grid; place-items: center; }
.tray .empty { width: 30px; height: 40px; border-bottom: 2px solid var(--ink-faint); margin: 0 2px; }
.tray.ok .chip { border-color: var(--green); color: var(--green); }

/* ---------- 宫格 ---------- */
.grid { display: grid; gap: 10px; margin: 0 auto; width: min(100%, var(--gw)); }
.cell {
  aspect-ratio: 1; border: 1.5px solid var(--ink); border-radius: 4px; background: var(--paper-3);
  font-size: clamp(28px, 8vw, 44px); position: relative; display: grid; place-items: center;
  box-shadow: 0 3px 0 rgba(43,38,34,.25); transition: transform .08s, background .15s;
}
.cell:active { transform: translateY(2px); box-shadow: 0 1px 0 rgba(43,38,34,.25); }
.cell.sel { background: var(--ink); color: var(--paper); }
.cell.sel::after {
  content: attr(data-order); position: absolute; top: 3px; right: 6px; font-size: 13px; color: var(--gold);
}
.cell.glow { box-shadow: 0 0 0 3px var(--gold), 0 0 18px 4px rgba(184,137,59,.7); }

/* ---------- 揭晓卡 / 结束 ---------- */
.veil {
  position: fixed; inset: 0; z-index: 5000; display: grid; place-items: center; padding: 16px;
  background: rgba(43,38,34,.35); backdrop-filter: blur(2px); animation: fade .2s;
}
@keyframes fade { from { opacity: 0; } }
.reveal {
  width: min(520px, 100%); max-height: 88vh; overflow: auto; padding: 18px 20px; background: var(--paper-3); border-radius: 6px; text-align: center;
  box-shadow: 0 8px 24px -10px rgba(60,40,10,.45); animation: rise .35s ease-out;
}
.reveal .verdict { font-size: 22px; letter-spacing: .2em; margin-bottom: 6px; }
.reveal .verdict.ok { color: var(--green); }
.reveal .verdict.bad { color: var(--red); }
.reveal h3 { margin: 6px 0 2px; font-size: 20px; letter-spacing: .08em; }
.reveal .meta { color: var(--ink-soft); font-size: 14px; margin-bottom: 10px; }
.reveal .lines { font-size: 18px; line-height: 1.9; letter-spacing: .06em; color: var(--ink-soft); }
.reveal .lines .hl { color: var(--ink); font-weight: 700; }
.reveal .lines mark { background: linear-gradient(transparent 60%, rgba(176,57,43,.25) 60%); color: var(--red); }
.reveal .btn { margin-top: 14px; }
.over { text-align: center; padding: 30px 0; }
.over .big { font-size: 64px; color: var(--red); margin: 8px 0; }
.over p { color: var(--ink-soft); }

.shake { animation: shake .4s; }
@keyframes shake { 20%, 60% { transform: translateX(-6px); } 40%, 80% { transform: translateX(6px); } }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } }
.toast {
  position: fixed; left: 50%; top: 18%; transform: translateX(-50%); z-index: 9999;
  background: var(--ink); color: var(--paper); padding: 8px 18px; border-radius: 4px; font-size: 16px;
  animation: rise .2s ease-out; pointer-events: none;
}
.float-score { position: fixed; z-index: 9999; color: var(--red); font-size: 24px; font-weight: 700; pointer-events: none; animation: floatUp .9s ease-out forwards; }
@keyframes floatUp { to { opacity: 0; transform: translateY(-50px); } }