@charset "UTF-8";

/* ---------- 设计变量：宣纸、墨色、朱印与木 ---------- */
:root {
  color-scheme: light;
  --serif: "Noto Serif CJK SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --kai: "Kaiti SC", "STKaiti", "KaiTi", "AR PL UKai CN", "Noto Serif CJK SC", "Source Han Serif SC", "Songti SC", serif;
  --sans: "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --paper: #f3eee3;
  --paper-2: #ebe3d3;
  --surface: #f9f6ef;
  --line: rgb(74 54 30 / .13);
  --line-strong: rgb(74 54 30 / .24);
  --ink: #2b2620;
  --ink-2: #5f574b;
  --faint: #998f7f;
  --seal: #b03a2a;
  --seal-soft: rgb(176 58 42 / .1);
  --seal-text: #fbefe3;
  --jade: #3d6b56;
  --gold: #b88a3e;
  --button: #2f2a24;
  --button-hover: #48413a;
  --button-text: #f7f1e6;
  --focus: #c08a3e;
  --grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .36 0 0 0 0 .27 0 0 0 0 .16 0 0 0 .07 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");

  --frame-a: #8d5d2d;
  --frame-b: #643c1b;
  --wood: #ebcc94;
  --wood-shade: #dcb679;
  --board-line: #6e4823;
  --board-text: #7a552b;
  --move-dot: rgb(42 88 66 / .55);
  --capture-ring: rgb(176 46 30 / .85);
  --last-move: rgb(176 58 42 / .9);
  --select: rgb(204 146 48);
  --hint: #2f7a5e;
  --piece-face-1: #fffaf0;
  --piece-face-2: #f1dfba;
  --piece-face-3: #d9b884;
  --piece-rim: #a98050;
  --piece-red: #b2271c;
  --piece-black: #1f1d1a;

  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --paper: #171512;
    --paper-2: #1d1a16;
    --surface: #221f1a;
    --line: rgb(255 238 210 / .09);
    --line-strong: rgb(255 238 210 / .17);
    --ink: #ece4d4;
    --ink-2: #b6ac9b;
    --faint: #80786b;
    --seal: #d6644d;
    --seal-soft: rgb(214 100 77 / .14);
    --seal-text: #1d1915;
    --jade: #86b9a0;
    --gold: #d2a560;
    --button: #e9dfcb;
    --button-hover: #fff6e6;
    --button-text: #1d1a16;
    --grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 .95 0 0 0 0 .85 0 0 0 .035 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");

    --frame-a: #6a4523;
    --frame-b: #452914;
    --wood: #d4b17a;
    --wood-shade: #c29e64;
    --board-line: #5c3d1d;
    --board-text: #64441f;
  }
}

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--grain), var(--paper); }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; -webkit-tap-highlight-color: transparent; }
button:disabled { opacity: .38; cursor: not-allowed; }
[hidden] { display: none !important; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
::selection { background: var(--seal-soft); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.icon-button svg, .board-toolbar svg, .review-controls svg {
  fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round;
}

/* ---------- 外框与侧栏 ---------- */
.app-shell { position: relative; min-height: 100vh; min-height: 100dvh; display: grid; grid-template-columns: 232px minmax(0, 1fr); }
.sidebar {
  position: sticky; top: 0; height: 100vh; height: 100dvh;
  display: flex; flex-direction: column; gap: 6px;
  padding: 30px 18px 26px; background: var(--grain), var(--paper-2);
  border-right: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 14px; margin: 0 6px 34px; text-decoration: none; }
.seal {
  display: grid; place-items: center; flex: none; width: 46px; height: 46px; border-radius: 7px;
  background: var(--seal); color: var(--seal-text); font: 700 29px/1 var(--kai);
  box-shadow: inset 0 0 0 2px var(--seal), inset 0 0 0 3.5px rgb(255 240 225 / .55);
  transform: rotate(-4deg);
}
.brand-text { margin: 0; font: 600 27px/1.1 var(--serif); letter-spacing: 6px; color: var(--ink); }
.brand-text small { display: block; margin-top: 6px; font: 12px var(--sans); letter-spacing: 5px; color: var(--faint); }
.mode-nav { display: flex; flex-direction: column; gap: 4px; }
.mode-nav button {
  display: flex; align-items: center; gap: 14px; padding: 11px 12px;
  border: 1px solid transparent; border-radius: 10px; background: transparent;
  color: var(--ink-2); font-size: 15px; text-align: left; white-space: nowrap;
  transition: background .18s, color .18s, border-color .18s;
}
.mode-nav button:hover { background: rgb(74 54 30 / .05); color: var(--ink); }
.mode-nav button.active { background: var(--surface); border-color: var(--line); color: var(--ink); box-shadow: 0 1px 2px rgb(60 40 20 / .06); }
.mode-nav small { display: block; margin-top: 3px; font-size: 12px; color: var(--faint); letter-spacing: .5px; }
.nav-seal {
  display: grid; place-items: center; flex: none; width: 34px; height: 34px; border-radius: 7px;
  border: 1.5px solid currentColor; font: 700 18px/1 var(--kai); opacity: .75;
  transition: background .18s, color .18s, border-color .18s, transform .18s;
}
.mode-nav button.active .nav-seal { background: var(--seal); border-color: var(--seal); color: var(--seal-text); opacity: 1; transform: rotate(-4deg); }
.sidebar-bottom { margin-top: auto; padding: 0 10px; display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; }
.poem { writing-mode: vertical-rl; font: 19px/1.9 var(--kai); letter-spacing: 7px; color: var(--faint); }
.sidebar-link { padding: 0; border: 0; background: none; color: var(--ink-2); font-size: 13px; text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 5px; }
.sidebar-link:hover { color: var(--seal); text-decoration-color: currentColor; }

.workspace { min-width: 0; display: flex; flex-direction: column; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; padding: 0 32px; }
.heading { display: flex; align-items: baseline; gap: 14px; min-width: 0; }
.eyebrow { margin: 0; font-size: 12px; letter-spacing: 3px; color: var(--seal); white-space: nowrap; }
.mode-title { margin: 0; font: 500 22px/1.3 var(--serif); letter-spacing: 3px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.top-tools { display: flex; align-items: center; gap: 4px; }
.icon-button {
  display: grid; place-items: center; width: 38px; height: 38px; padding: 0;
  border: 0; border-radius: 50%; background: transparent; color: var(--ink-2);
}
.icon-button:hover { background: rgb(74 54 30 / .07); color: var(--ink); }
.icon-button svg { width: 21px; height: 21px; }
#sound-btn .sound-on { display: none; }
#sound-btn[aria-pressed="true"] { color: var(--seal); }
#sound-btn[aria-pressed="true"] .sound-on { display: inline; }
#sound-btn[aria-pressed="true"] .sound-off { display: none; }

/* ---------- 主布局 ---------- */
.play-layout {
  /* 棋盘宽度随视口高度收放，让整块棋盘留在一屏之内；棋盘与侧栏作为一组居中。 */
  --chrome: 316px;
  --board-max: 660px;
  --board-w: min(var(--board-max), max(320px, calc((100vh - var(--chrome)) * .8788 + 28px)));
  display: grid; grid-template-columns: minmax(0, var(--board-w)) 300px; justify-content: center; gap: 40px; align-items: start;
  width: 100%; margin: 0 auto; padding: 8px 32px 20px;
}
@supports (height: 100dvh) {
  .play-layout { --board-w: min(var(--board-max), max(320px, calc((100dvh - var(--chrome)) * .8788 + 28px))); }
}
.table-area { width: 100%; min-width: 0; }
.noscript { grid-column: 1 / -1; margin: 0; padding: 12px; border: 1px solid var(--seal); border-radius: 8px; color: var(--seal); text-align: center; }
.about { width: min(100% - 64px, 960px); margin: 48px auto 8px; padding-top: 36px; border-top: 1px solid var(--line); }
.about > h2 { display: flex; align-items: center; gap: 10px; margin: 0 0 12px; font: 600 20px var(--serif); letter-spacing: 3px; }
.about > h2::before { content: ""; width: 3px; height: 18px; border-radius: 2px; background: var(--seal); }
.about-lead { max-width: 46em; margin: 0 0 24px; font-size: 14px; line-height: 1.9; color: var(--ink-2); }
.about-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px 28px; }
.about-grid h3 { margin: 0 0 6px; font: 600 15px var(--serif); letter-spacing: 2px; }
.about-grid p { margin: 0; font-size: 13px; line-height: 1.85; color: var(--faint); }
.site-footer {
  display: flex; justify-content: space-between; gap: 12px; margin: auto 32px 0; padding: 16px 0 20px;
  border-top: 1px solid var(--line); font: 12px var(--serif); letter-spacing: 2px; color: var(--faint);
}

/* ---------- 棋手信息 ---------- */
.player-bar { display: flex; align-items: center; gap: 12px; min-height: 52px; padding: 4px 4px 10px; }
#bottom-player { padding: 10px 4px 4px; }
.avatar {
  position: relative; display: grid; place-items: center; flex: none; width: 40px; height: 40px; border-radius: 50%;
  font: 700 21px/1 var(--kai); color: var(--piece-black);
  background: radial-gradient(circle at 38% 30%, var(--piece-face-1), var(--piece-face-2) 50%, var(--piece-face-3));
  box-shadow: 0 2px 0 var(--piece-rim), 0 4px 8px rgb(60 35 10 / .2);
}
.avatar::before { content: ""; position: absolute; inset: 4px; border-radius: 50%; border: 1px solid currentColor; opacity: .45; }
.avatar.red { color: var(--piece-red); }
.player-info { flex: 1; min-width: 0; }
.player-name { font: 600 15px var(--serif); letter-spacing: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.player-desc { display: flex; align-items: center; flex-wrap: wrap; gap: 4px 10px; margin-top: 3px; font-size: 12px; color: var(--faint); }
.captures { display: inline-flex; flex-wrap: wrap; gap: 3px; }
.capture-chip {
  display: inline-grid; place-items: center; width: 19px; height: 19px; border-radius: 50%;
  font: 700 11px/1 var(--kai); color: var(--piece-black);
  background: radial-gradient(circle at 38% 30%, var(--piece-face-1), var(--piece-face-3));
  box-shadow: 0 1px 0 var(--piece-rim);
}
.capture-chip.red { color: var(--piece-red); }
.player-status { display: inline-flex; align-items: center; gap: 6px; flex: none; font-size: 12px; letter-spacing: 1px; color: var(--faint); }
.player-status.active { color: var(--jade); }
.player-status.active::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.player-status.check { color: var(--seal); }
.player-status.won {
  padding: 1px 7px; border: 1.5px solid var(--seal); border-radius: 4px;
  color: var(--seal); font: 700 13px var(--kai); transform: rotate(-4deg);
}
.player-status.thinking::before { animation: pulse 1s infinite; }

/* ---------- 棋盘 ---------- */
.board-frame {
  padding: 14px; border-radius: 8px;
  background:
    linear-gradient(140deg, rgb(255 236 200 / .16), transparent 45%),
    repeating-linear-gradient(87deg, rgb(0 0 0 / .06) 0 1px, transparent 1px 5px, rgb(255 220 170 / .04) 5px 7px, transparent 7px 12px),
    linear-gradient(165deg, var(--frame-a), var(--frame-b));
  box-shadow:
    inset 0 1px 0 rgb(255 228 190 / .28), inset 0 0 0 1px rgb(255 228 190 / .12),
    0 2px 2px rgb(50 28 10 / .25), 0 22px 44px -16px rgb(50 28 10 / .5);
  transition: box-shadow .2s;
}
.board-frame.reviewing {
  box-shadow: 0 0 0 3px var(--gold), inset 0 1px 0 rgb(255 228 190 / .28), 0 22px 44px -16px rgb(50 28 10 / .5);
}
.board {
  position: relative; width: 100%; aspect-ratio: 580 / 660; container-type: inline-size;
  border-radius: 3px; isolation: isolate; user-select: none; -webkit-user-select: none;
  background:
    radial-gradient(130% 80% at 25% 0%, rgb(255 247 225 / .55), transparent 60%),
    radial-gradient(90% 70% at 85% 100%, rgb(140 90 35 / .16), transparent 60%),
    repeating-linear-gradient(93deg, rgb(120 76 28 / .05) 0 1px, transparent 1px 7px, rgb(120 76 28 / .03) 7px 9px, transparent 9px 17px),
    linear-gradient(180deg, var(--wood), var(--wood-shade));
  box-shadow: inset 0 0 0 1px rgb(80 48 18 / .45), inset 0 0 28px rgb(110 70 25 / .2), 0 0 0 1px rgb(255 228 190 / .15);
}
.board svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.board .grid { stroke: var(--board-line); stroke-width: 1.15; fill: none; opacity: .9; }
.board .grid .frame-line { stroke-width: 2.4; }
.board .river { fill: var(--board-text); font: 30px var(--kai); letter-spacing: 18px; opacity: .78; }
.board .coords { fill: var(--board-text); font: 16px var(--serif); text-anchor: middle; opacity: .85; }
.board .board-overlay { z-index: 4; }
.hint-arrow { stroke: var(--hint); stroke-width: 9; stroke-linecap: round; fill: none; opacity: .72; }
.hint-head { fill: var(--hint); opacity: .72; }

.cell {
  position: absolute; z-index: 1; width: 9.4828%; height: 8.3333%; padding: 0;
  transform: translate(-50%, -50%); border: 0; border-radius: 50%; background: transparent;
}
.cell:focus-visible { outline-offset: 1px; }
.piece {
  position: absolute; inset: 0; display: grid; place-items: center; border-radius: 50%;
  --ring: var(--piece-black);
  background: radial-gradient(circle at 36% 28%, var(--piece-face-1) 0%, var(--piece-face-2) 46%, var(--piece-face-3) 100%);
  box-shadow:
    0 .55cqw 0 var(--piece-rim),
    0 .8cqw .4cqw rgb(60 34 10 / .32),
    0 1.6cqw 2.4cqw rgb(60 34 10 / .2),
    inset 0 -.5cqw .9cqw rgb(120 80 30 / .2),
    inset 0 .3cqw .4cqw rgb(255 255 255 / .5);
  color: var(--piece-black);
  font: 700 clamp(15px, 5.6cqw, 40px)/1 var(--kai);
  text-shadow: 0 .12cqw 0 rgb(255 250 235 / .7);
  transition: transform .14s ease, box-shadow .14s ease;
}
.piece::before {
  content: ""; position: absolute; inset: 9%; border-radius: 50%;
  border: .32cqw solid var(--ring); opacity: .55; pointer-events: none;
}
.piece.red { --ring: var(--piece-red); color: var(--piece-red); }
.piece-text { position: relative; transform: translateY(-.03em); }
.cell:hover .piece { transform: translateY(-1.5px); }
.cell.selected .piece {
  transform: translateY(-.8cqw) scale(1.04);
  box-shadow:
    0 .55cqw 0 var(--piece-rim),
    0 0 0 .55cqw var(--select),
    0 1.8cqw 2.6cqw rgb(60 34 10 / .32),
    inset 0 -.5cqw .9cqw rgb(120 80 30 / .2),
    inset 0 .3cqw .4cqw rgb(255 255 255 / .5);
}
.cell.arriving { z-index: 3; }
.piece.arrive { animation: arrive .24s cubic-bezier(.2, .75, .25, 1) both; }
@keyframes arrive { from { transform: translate(var(--dx), var(--dy)) scale(1.06); } }

.cell.legal::after {
  content: ""; position: absolute; inset: 38%; border-radius: 50%; background: var(--move-dot); pointer-events: none;
  transition: inset .12s;
}
.cell.legal.capture::after { inset: -6%; background: none; border: .5cqw solid var(--capture-ring); z-index: 2; }
.cell.legal:hover::after { inset: 32%; }
.cell.legal.capture:hover::after { inset: -8%; }
.cell.last-from::before {
  content: ""; position: absolute; inset: 30%; border-radius: 50%; pointer-events: none;
  background: rgb(176 58 42 / .18); box-shadow: 0 0 0 .35cqw rgb(176 58 42 / .4);
}
.cell.last-to::before {
  --c: var(--last-move); --t: .5cqw; --l: 24%;
  content: ""; position: absolute; inset: -9%; pointer-events: none; z-index: 2;
  background:
    linear-gradient(var(--c), var(--c)) top left / var(--l) var(--t),
    linear-gradient(var(--c), var(--c)) top left / var(--t) var(--l),
    linear-gradient(var(--c), var(--c)) top right / var(--l) var(--t),
    linear-gradient(var(--c), var(--c)) top right / var(--t) var(--l),
    linear-gradient(var(--c), var(--c)) bottom left / var(--l) var(--t),
    linear-gradient(var(--c), var(--c)) bottom left / var(--t) var(--l),
    linear-gradient(var(--c), var(--c)) bottom right / var(--l) var(--t),
    linear-gradient(var(--c), var(--c)) bottom right / var(--t) var(--l);
  background-repeat: no-repeat;
}
.cell.hint::before {
  content: ""; position: absolute; inset: -7%; border-radius: 50%; pointer-events: none; z-index: 2;
  border: .55cqw solid var(--hint); animation: pulse 1.4s infinite;
}
.cell.checked .piece {
  background: radial-gradient(circle at 36% 28%, #fff3ea 0%, #f6caae 50%, #e19b78 100%);
  box-shadow: 0 .55cqw 0 #a5583c, 0 0 0 .55cqw rgb(190 50 30 / .9), 0 0 2.6cqw rgb(220 60 30 / .55);
  animation: check-pulse 1.2s ease-in-out infinite;
}
@keyframes check-pulse { 50% { box-shadow: 0 .55cqw 0 #a5583c, 0 0 0 .9cqw rgb(190 50 30 / .5), 0 0 3.4cqw rgb(220 60 30 / .3); } }
@keyframes pulse { 50% { opacity: .35; } }

/* ---------- 棋盘工具栏与提示 ---------- */
.board-toolbar { display: flex; justify-content: center; flex-wrap: wrap; gap: 2px; padding: 10px 0 2px; }
.board-toolbar button {
  display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px;
  border: 1px solid transparent; border-radius: 999px; background: none; color: var(--ink-2); font-size: 13px; letter-spacing: 1px; white-space: nowrap;
  transition: background .15s, color .15s, border-color .15s;
}
.board-toolbar button:hover:not(:disabled) { background: var(--surface); border-color: var(--line); color: var(--ink); }
.board-toolbar svg { width: 18px; height: 18px; }
.game-message { min-height: 34px; padding: 8px 6px 0; text-align: center; font: 14px/1.6 var(--serif); letter-spacing: 1px; color: var(--ink-2); }
.game-message.win { color: var(--seal); font-weight: 600; }
.game-message.alert { color: var(--seal); }

/* ---------- 侧边面板 ---------- */
.game-sidebar { display: flex; flex-direction: column; gap: 16px; padding-top: 4px; }
.panel { overflow: hidden; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 16px 18px 8px; }
.panel-heading h2 { display: flex; align-items: center; gap: 9px; margin: 0; font: 600 16px var(--serif); letter-spacing: 2px; }
.panel-heading h2::before { content: ""; width: 3px; height: 15px; border-radius: 2px; background: var(--seal); }
.subtle-badge {
  padding: 1px 7px; border: 1px solid var(--seal); border-radius: 4px;
  font: 600 12px var(--serif); letter-spacing: 1px; color: var(--seal);
}
.meta { font-size: 12px; color: var(--faint); }
.mode-description { margin: 0 0 16px; padding: 0 18px; font-size: 13px; line-height: 1.8; color: var(--ink-2); }
#mode-controls { padding: 0 18px 18px; }

.field { display: block; margin-bottom: 14px; font-size: 12px; letter-spacing: 1px; color: var(--faint); }
.field > span { display: block; margin-bottom: 7px; }
.field select, .field input {
  width: 100%; height: 40px; padding: 0 12px; border: 1px solid var(--line-strong); border-radius: 7px;
  background: var(--paper); color: var(--ink); font-size: 14px; letter-spacing: 0;
}
.field select:hover, .field input:hover { border-color: var(--faint); }
.field input { font-family: var(--mono); letter-spacing: 4px; text-transform: uppercase; }
.field input::placeholder { font-family: var(--sans); letter-spacing: 1px; text-transform: none; color: var(--faint); }
.segmented { display: flex; gap: 3px; padding: 3px; border-radius: 8px; background: var(--paper-2); border: 1px solid var(--line); }
.segmented button { flex: 1; padding: 7px 4px; border: 0; border-radius: 6px; background: transparent; color: var(--ink-2); font-size: 13px; letter-spacing: 1px; }
.segmented button.active { background: var(--surface); color: var(--ink); font-weight: 600; box-shadow: 0 1px 3px rgb(60 40 20 / .12); }
.primary, .secondary {
  width: 100%; padding: 10px 14px; border: 1px solid transparent; border-radius: 7px;
  font-size: 14px; letter-spacing: 2px; transition: background .15s, transform .1s, border-color .15s;
}
.primary { background: var(--button); color: var(--button-text); }
.primary:hover:not(:disabled) { background: var(--button-hover); }
.secondary { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.secondary:hover:not(:disabled) { background: var(--paper-2); border-color: var(--faint); }
.primary:active:not(:disabled), .secondary:active:not(:disabled) { transform: translateY(1px); }
.button-row { display: flex; gap: 8px; }
.button-row > * { flex: 1; }
.control-note { margin: 10px 0 0; font-size: 12px; line-height: 1.7; color: var(--faint); text-align: center; }
.mode-help { margin: 0 0 16px; font-size: 13px; line-height: 1.8; color: var(--ink-2); }

.puzzle-list { display: grid; gap: 2px; margin: 0 -8px 12px; }
.puzzle-option {
  display: flex; align-items: center; gap: 10px; width: 100%; padding: 7px 8px;
  border: 0; border-radius: 7px; background: transparent; color: var(--ink); text-align: left;
}
.puzzle-option:hover { background: var(--paper-2); }
.puzzle-option.active { background: var(--seal-soft); }
.puzzle-number { min-width: 22px; font: 15px var(--serif); color: var(--faint); }
.puzzle-option.active .puzzle-number { color: var(--seal); }
.puzzle-name { flex: 1; font: 14px var(--serif); letter-spacing: 1px; }
.puzzle-name small { display: block; margin-top: 1px; font: 11px var(--sans); letter-spacing: 0; color: var(--faint); }
.puzzle-check { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 5px; font: 700 12px var(--kai); }
.puzzle-check.done { border: 1.5px solid var(--seal); color: var(--seal); transform: rotate(-6deg); }

.online-info { margin: 0 0 12px; font-size: 14px; line-height: 1.7; }
.room-code {
  margin: 4px 0 12px; padding: 14px 0; border: 1px dashed var(--line-strong); border-radius: 8px;
  background: var(--paper); color: var(--ink); text-align: center; user-select: all;
  font: 600 29px var(--mono); letter-spacing: 8px;
}
.connection { display: flex; align-items: center; justify-content: center; gap: 6px; margin: 12px 0; font-size: 12px; color: var(--jade); }
.connection::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.connection.error { color: var(--seal); }
.connection.error::before { animation: pulse 1s infinite; }
.offer { margin: 0 0 12px; padding: 12px; border: 1px solid var(--seal-soft); border-radius: 9px; background: var(--seal-soft); }
.offer p { margin: 0 0 10px; font: 600 14px var(--serif); letter-spacing: 1px; color: var(--seal); }
.offer-note { margin: 0 0 12px; font-size: 12px; text-align: center; color: var(--ink-2); }
.text-button { display: block; margin: 14px auto 0; padding: 0; border: 0; background: none; color: var(--ink-2); font-size: 12px; text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 4px; }
.text-button:hover { color: var(--seal); text-decoration-color: currentColor; }
#join-form { display: grid; gap: 8px; }
#join-form .field { margin: 0; }

/* ---------- 棋谱 ---------- */
.record-head, .record-row { display: grid; grid-template-columns: 34px 1fr 1fr; gap: 4px; align-items: center; text-align: center; }
.record-head { margin: 0 12px; padding: 4px 0 8px; border-bottom: 1px solid var(--line); font-size: 12px; letter-spacing: 1px; color: var(--faint); }
.move-list { height: 210px; overflow: auto; padding: 6px 12px; scroll-behavior: smooth; overscroll-behavior: contain; }
.record-row > span { font: 12px var(--serif); color: var(--faint); }
.move {
  padding: 3px 2px; border: 0; border-radius: 6px; background: none; color: var(--ink);
  font: 15px/1.6 var(--kai); letter-spacing: 1px; white-space: nowrap;
}
.move.red-move { color: var(--piece-red); }
.move:hover { background: var(--paper-2); }
.move.current { background: var(--paper-2); box-shadow: inset 0 0 0 1px var(--line-strong); font-weight: 700; }
.empty-record { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; height: 100%; font: 13px var(--serif); letter-spacing: 1px; color: var(--faint); }
.empty-record span { font: 32px var(--kai); opacity: .5; }
.record-footer { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 8px 12px; border-top: 1px solid var(--line); }
.review-controls { display: flex; gap: 2px; }
.review-controls button { display: grid; place-items: center; width: 32px; height: 30px; padding: 0; border: 0; border-radius: 6px; background: none; color: var(--ink-2); }
.review-controls button:hover:not(:disabled) { background: var(--paper-2); color: var(--ink); }
.review-controls svg { width: 17px; height: 17px; }
.link-button { padding: 4px 6px; border: 0; background: none; color: var(--ink-2); font-size: 12px; letter-spacing: 1px; }
.link-button:hover:not(:disabled) { color: var(--seal); }

.note-card { display: flex; align-items: flex-start; gap: 12px; padding: 4px 6px; }
.note-mark { font: 24px/1 var(--kai); color: var(--seal); opacity: .7; }
.note-card h3 { margin: 0 0 5px; font: 600 13px var(--serif); letter-spacing: 1px; color: var(--ink-2); }
.note-card p { margin: 0; font-size: 12px; line-height: 1.85; color: var(--faint); }

/* ---------- 对话框与提示 ---------- */
dialog {
  width: min(440px, calc(100vw - 32px)); max-height: 86vh; overflow: auto; padding: 26px;
  border: 1px solid var(--line); border-radius: 14px; background: var(--grain), var(--surface); color: var(--ink);
  box-shadow: 0 30px 80px rgb(30 20 10 / .35);
}
dialog[open] { animation: dialog-in .2s ease-out; }
@keyframes dialog-in { from { opacity: 0; transform: translateY(8px) scale(.98); } }
dialog::backdrop { background: rgb(30 22 14 / .45); backdrop-filter: blur(3px); }
.dialog-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.dialog-top h2 { margin: 0; font: 600 22px var(--serif); letter-spacing: 3px; }
#modal-content { font-size: 14px; line-height: 1.9; color: var(--ink-2); }
#modal-content p { margin: 0 0 10px; }
#modal-content ul { margin: 0 0 12px; padding-left: 20px; }
#modal-content li { margin-bottom: 6px; }
#modal-content strong { color: var(--ink); }
#modal-content kbd { padding: 1px 6px; border: 1px solid var(--line-strong); border-radius: 4px; background: var(--paper); font: 12px var(--mono); }
#modal-actions { display: flex; gap: 10px; margin-top: 20px; }
#copy-fallback { white-space: pre-wrap; user-select: all; font-family: var(--kai); color: var(--ink); }
.result { display: flex; align-items: center; gap: 20px; margin-bottom: 4px; }
.result-seal {
  display: grid; place-items: center; flex: none; width: 74px; height: 74px; border-radius: 10px;
  border: 2.5px solid currentColor; box-shadow: inset 0 0 0 4px var(--surface), inset 0 0 0 5.5px currentColor;
  color: var(--seal); font: 700 40px/1 var(--kai); transform: rotate(-6deg);
}
.result-seal.lose { color: var(--faint); }
.result-seal.draw { color: var(--gold); }
.result p { margin: 0 0 4px !important; }
.result .result-reason { font: 600 17px var(--serif); letter-spacing: 2px; color: var(--ink); }

#toast {
  position: fixed; left: 50%; bottom: calc(24px + env(safe-area-inset-bottom)); z-index: 99;
  max-width: calc(100vw - 32px); padding: 11px 20px; border-radius: 10px;
  background: var(--button); color: var(--button-text); font-size: 14px; letter-spacing: 1px; box-shadow: 0 10px 30px rgb(30 20 10 / .25);
  opacity: 0; pointer-events: none; transform: translate(-50%, 16px); transition: opacity .2s, transform .2s;
}
#toast.visible { opacity: 1; transform: translate(-50%, 0); }
@media (min-width: 641px) {
  #toast { top: 72px; bottom: auto; transform: translate(-50%, -12px); }
}

/* ---------- 响应式 ---------- */
@media (min-width: 1500px) {
  .play-layout { --board-max: 720px; grid-template-columns: minmax(0, var(--board-w)) 320px; gap: 56px; }
}

@media (max-width: 1100px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; flex-direction: row; align-items: center; gap: 24px; padding: 10px 20px; border-right: 0; border-bottom: 1px solid var(--line); }
  .brand { margin: 0; gap: 10px; }
  .brand-text { font-size: 22px; letter-spacing: 4px; }
  .brand-text small, .mode-nav small, .sidebar-bottom { display: none; }
  .seal { width: 36px; height: 36px; font-size: 23px; }
  .mode-nav { flex: 1; flex-direction: row; justify-content: center; gap: 4px; }
  .mode-nav button { justify-content: center; gap: 8px; padding: 6px 14px 6px 8px; font-size: 14px; }
  .nav-seal { width: 28px; height: 28px; font-size: 15px; }
  .topbar { height: 52px; padding: 0 24px; }
  .play-layout { --chrome: 304px; grid-template-columns: minmax(0, var(--board-w)) 280px; gap: 28px; padding: 6px 24px 16px; }
}

@media (max-width: 860px) {
  .play-layout { grid-template-columns: minmax(0, 600px); gap: 16px; }
  .game-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-items: start; padding-top: 0; }
  .note-card { grid-column: 1 / -1; }
  .site-footer { display: none; }
  .about-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .sidebar { flex-wrap: wrap; gap: 8px; padding: 10px 12px 8px; }
  .brand { padding-right: 96px; }
  .brand-text small { display: inline; margin-left: 8px; font-size: 12px; letter-spacing: 2px; }
  .mode-nav { flex-basis: 100%; gap: 2px; }
  .mode-nav button { flex: 1; flex-direction: column; gap: 4px; padding: 7px 2px; font-size: 12px; border-radius: 9px; }
  .nav-seal { width: 26px; height: 26px; font-size: 14px; }
  .topbar { position: absolute; top: 8px; right: 8px; height: auto; padding: 0; }
  .heading { display: none; }
  .play-layout { padding: 8px 10px 16px; gap: 14px; }
  .table-area { width: 100%; }
  .board-frame { padding: 7px; border-radius: 6px; }
  .player-bar { min-height: 46px; gap: 10px; padding: 2px 2px 6px; }
  #bottom-player { padding: 6px 2px 2px; }
  .avatar { width: 34px; height: 34px; font-size: 18px; }
  .player-name { font-size: 14px; }
  .board-toolbar { gap: 0; padding-top: 6px; }
  .board-toolbar button { flex-direction: column; gap: 2px; padding: 6px 10px; font-size: 11px; }
  .board-toolbar svg { width: 20px; height: 20px; }
  .game-message { font-size: 13px; padding-top: 4px; }
  .game-sidebar { grid-template-columns: 1fr; }
  .move-list { height: 180px; }
  .room-code { font-size: 25px; letter-spacing: 6px; }
  .about { width: calc(100% - 32px); margin-top: 24px; padding-top: 24px; }
  .about-grid { grid-template-columns: 1fr; gap: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}