/* ===== 數獨小學堂 — 可愛風主題 ===== */
:root{
  --ink:#4A3B55;
  --ink-soft:#7A6A88;
  --paper:#FFFDF8;
  --grape:#C9B6F5;  --grape-d:#A48FDB;  --grape-t:#6E4FBF;
  --mint:#A9E7D2;   --mint-d:#79C6AC;
  --peach:#FFC2B4;  --peach-d:#E89C8B;
  --sky:#AED9F5;    --sky-d:#7FB4DA;
  --lemon:#FFE3A0;  --lemon-d:#E7C263;
  --rose:#FFB8CF;   --rose-d:#E88CAA;
  --cream:#FFF0DE;  --cream-d:#E6D2B4;
  --danger:#D2444F; --danger-bg:#FFE6E8;
  --line:#DED3EA;
  --radius:22px;
  --d:8px;
  font-size:16px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%;min-height:100%;margin:0;padding:0}
body{
  font-family:"Yuanti TC","圓體-繁","PingFang TC","蘋方-繁","Microsoft JhengHei","Noto Sans TC","Segoe UI",system-ui,sans-serif;
  color:var(--ink);
  background:linear-gradient(165deg,#F4EEFF 0%,#FFF7EC 48%,#E9F9F2 100%);
  overflow:hidden;touch-action:manipulation;user-select:none;-webkit-user-select:none;
}
#bgdeco{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
#bgdeco span{position:absolute;display:block;border-radius:34%;opacity:.4;animation:float linear infinite}
@keyframes float{0%{transform:translateY(0) rotate(0)}50%{transform:translateY(-24px) rotate(10deg)}100%{transform:translateY(0) rotate(0)}}

#app{position:relative;z-index:1;height:100%;min-height:100dvh}
.screen{
  position:absolute;inset:0;display:none;overflow-y:auto;overflow-x:hidden;
  -webkit-overflow-scrolling:touch;
  padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
.screen.active{display:block}
.screen.flexcenter.active{display:flex;align-items:center;justify-content:center}
[hidden]{display:none!important}

/* ---------- 立體 SVG 按鈕 ---------- */
.btn3d{
  position:relative;border:0;background:none;padding:13px 24px calc(13px + var(--d));
  font:inherit;font-weight:800;font-size:1.02rem;color:var(--ink);cursor:pointer;
  letter-spacing:.03em;line-height:1.15;min-height:52px;
  display:inline-flex;align-items:center;justify-content:center;
}
.btn3d .b3-svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}
.btn3d .b3-face{transition:transform .07s ease}
.btn3d .b3-lbl{position:relative;z-index:2;display:inline-flex;align-items:center;gap:.4em;transition:transform .07s ease;text-shadow:0 1px 0 rgba(255,255,255,.65)}
.btn3d.press .b3-face,.btn3d.press .b3-lbl{transform:translateY(calc(var(--d) - 2px))}
.btn3d[disabled]{opacity:.42;cursor:default}
.btn3d:focus-visible{outline:3px solid var(--sky-d);outline-offset:3px;border-radius:18px}
.btn3d.big{font-size:1.3rem;padding:18px 34px calc(18px + var(--d));min-height:70px;--d:10px}
.btn3d.small{font-size:.9rem;padding:9px 15px calc(9px + var(--d));min-height:48px;--d:6px}
.btn3d.icononly{padding:10px 12px calc(10px + var(--d));min-width:52px;min-height:52px;font-size:1.3rem;--d:6px}
.btn3d .ico{font-size:1.15em}

/* 右上角設定入口：固定在安全區內，不遮住遊戲控制 */
.settings-fab{
  position:fixed;z-index:70;
  top:calc(10px + env(safe-area-inset-top));
  right:calc(12px + env(safe-area-inset-right));
  --d:6px;
}
.settings-fab .b3-lbl{font-size:1.3rem}
/* 語言切換鈕（I18N.mountToggle 產生）：固定在設定鈕左側，尺寸、位置、風格與設定鈕同步 */
.lang-toggle{
  position:fixed;z-index:70;box-sizing:border-box;
  top:calc(10px + env(safe-area-inset-top));
  right:calc(12px + 52px + 8px + env(safe-area-inset-right));
  width:52px;height:46px;padding:0;margin:0;
  display:inline-flex;align-items:center;justify-content:center;
  border:3px solid var(--ink);border-radius:16px;background:var(--cream);color:var(--ink);
  font:inherit;font-weight:900;font-size:.95rem;letter-spacing:.02em;line-height:1;cursor:pointer;
  box-shadow:0 6px 0 var(--cream-d);
  -webkit-appearance:none;appearance:none;-webkit-tap-highlight-color:transparent;
  transition:transform .08s ease,box-shadow .08s ease,background .15s;
}
.lang-toggle:hover{background:#FFF6E8}
.lang-toggle:active{transform:translateY(4px);box-shadow:0 2px 0 var(--cream-d)}
.lang-toggle:focus-visible{outline:3px solid var(--sky-d);outline-offset:3px}
.lobby-home-link{position:fixed;z-index:65;top:calc(10px + env(safe-area-inset-top));left:calc(12px + env(safe-area-inset-left));display:inline-flex;align-items:center;min-height:44px;padding:9px 14px;border:3px solid var(--ink);border-radius:14px;background:var(--cream);color:var(--ink);font-size:.8rem;font-weight:900;text-decoration:none;box-shadow:0 4px 0 var(--cream-d);transition:transform .15s,box-shadow .15s,background .15s}
.lobby-home-link:hover{background:#FFF6E8;transform:translateY(-2px)}
.lobby-home-link:active{transform:translateY(3px);box-shadow:0 1px 0 var(--cream-d)}
.lobby-home-link:focus-visible{outline:3px solid var(--sky-d);outline-offset:3px}
@media (max-width:600px){
  #s-home .home-wrap{padding-top:max(70px,10vh)}
  .lobby-home-link{top:calc(8px + env(safe-area-inset-top));left:calc(8px + env(safe-area-inset-left));padding:8px 10px;font-size:.74rem}
}

/* ---------- 設定彈窗 ----------
 * 面板本身不捲動：標題列固定在上、按鈕列固定在下，中間的 .settings-body 才是唯一的捲動區。
 * 這樣內容再長，「完成」與關閉鈕都看得到，捲軸也不會壓在圓角與描邊上。 */
.settings-modal{position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center;padding:18px}
.settings-modal.open{display:flex}
.settings-backdrop{position:absolute;inset:0;background:rgba(74,59,85,.36);backdrop-filter:blur(3px)}
.settings-panel{
  position:relative;display:flex;flex-direction:column;
  width:min(94vw,470px);max-height:min(88dvh,700px);overflow:hidden;
  background:var(--paper);border:3px solid var(--ink);border-radius:26px;
  box-shadow:0 12px 0 rgba(74,59,85,.2);outline:none;
}
.settings-head{
  flex:0 0 auto;display:flex;align-items:center;gap:10px;
  padding:12px 14px 10px;background:linear-gradient(180deg,#F6EEFF 0%,var(--paper) 100%);
  border-bottom:3px solid var(--line);border-radius:23px 23px 0 0;
}
.settings-badge{
  flex:0 0 auto;display:flex;align-items:center;justify-content:center;width:38px;height:38px;
  border:3px solid var(--ink);border-radius:50%;background:var(--lemon);
  box-shadow:0 3px 0 var(--lemon-d);font-size:1.15rem;
}
.settings-head h2{flex:1;margin:0;text-align:center;font-size:1.3rem;letter-spacing:.05em}
.settings-close{flex:0 0 auto;width:44px;height:44px;border:3px solid var(--ink);border-radius:50%;background:var(--rose);color:var(--ink);font:inherit;font-size:1.1rem;font-weight:900;cursor:pointer;box-shadow:0 4px 0 var(--rose-d)}
.settings-close:active{transform:translateY(3px);box-shadow:0 1px 0 var(--rose-d)}

/* 唯一的捲動區。scrollbar-gutter 讓捲軸出現／消失時內容不會左右跳動。 */
.settings-body{
  flex:1 1 auto;min-height:0;overflow-y:auto;overflow-x:hidden;
  overscroll-behavior:contain;scrollbar-gutter:stable;
  padding:10px 12px 12px;outline:none;
  scrollbar-width:thin;scrollbar-color:var(--grape-d) transparent;
  -webkit-overflow-scrolling:touch;
}
.settings-body:focus-visible{outline:3px solid var(--sky-d);outline-offset:-3px;border-radius:12px}
.settings-body::-webkit-scrollbar{width:12px}
.settings-body::-webkit-scrollbar-track{background:transparent;margin:6px 0}
.settings-body::-webkit-scrollbar-thumb{background:var(--grape);border:2px solid var(--ink);border-radius:999px}
.settings-body::-webkit-scrollbar-thumb:hover{background:var(--grape-d)}

/* ---------- 房間資訊彈窗 ----------
 * 房號與主持人操作集中在這裡，遊戲進行中只保留一個輕量入口，讓棋盤取得完整高度。 */
.room-info-modal{position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center;padding:18px}
.room-info-modal.open{display:flex}
.room-info-backdrop{position:absolute;inset:0;background:rgba(74,59,85,.36);backdrop-filter:blur(3px)}
.room-info-panel{
  position:relative;display:flex;flex-direction:column;
  width:min(94vw,760px);max-height:min(88dvh,700px);overflow:hidden;
  background:var(--paper);border:3px solid var(--ink);border-radius:26px;
  box-shadow:0 12px 0 rgba(74,59,85,.2);outline:none;
}
.room-info-head{
  flex:0 0 auto;display:flex;align-items:center;gap:10px;
  padding:12px 14px 10px;background:linear-gradient(180deg,#F6EEFF 0%,var(--paper) 100%);
  border-bottom:3px solid var(--line);border-radius:23px 23px 0 0;
}
.room-info-badge{
  flex:0 0 auto;display:flex;align-items:center;justify-content:center;width:38px;height:38px;
  border:3px solid var(--ink);border-radius:50%;background:var(--sky);
  box-shadow:0 3px 0 var(--sky-d);font-size:1.05rem;
}
.room-info-head h2{flex:1;margin:0;text-align:center;font-size:1.3rem;letter-spacing:.05em}
.room-info-close{flex:0 0 auto;width:44px;height:44px;border:3px solid var(--ink);border-radius:50%;background:var(--rose);color:var(--ink);font:inherit;font-size:1.1rem;font-weight:900;cursor:pointer;box-shadow:0 4px 0 var(--rose-d)}
.room-info-close:active{transform:translateY(3px);box-shadow:0 1px 0 var(--rose-d)}
.room-info-body{
  flex:1 1 auto;min-height:0;overflow-y:auto;overflow-x:hidden;
  overscroll-behavior:contain;scrollbar-gutter:stable;
  padding:12px 14px 16px;scrollbar-width:thin;scrollbar-color:var(--grape-d) transparent;
  -webkit-overflow-scrolling:touch;
}
.room-info-body:focus-visible{outline:3px solid var(--sky-d);outline-offset:-3px;border-radius:12px}
.room-info-body::-webkit-scrollbar{width:12px}
.room-info-body::-webkit-scrollbar-track{background:transparent;margin:6px 0}
.room-info-body::-webkit-scrollbar-thumb{background:var(--grape);border:2px solid var(--ink);border-radius:999px}
.room-info-note{margin:0 0 12px;padding:10px 12px;background:#F6F0FF;border:2px solid var(--line);border-radius:14px;color:var(--ink-soft);font-size:.82rem;font-weight:700;line-height:1.55;text-align:center}
.room-info-body .hostbar{padding:0;justify-content:flex-start;align-items:stretch;gap:9px}
.room-info-body .host-codebox{flex:1 1 100%;justify-content:center}
.room-info-body .hostbar > .chip{display:inline-flex;align-items:center}
.room-info-body .hostbar > .btn3d{flex:1 1 150px}

/* 捲動陰影：純 CSS 的 background-attachment 技巧，只有真的可以捲時才會出現，
 * 不需要 JS，也不會在減少動態模式下動來動去。 */
.settings-body{
  background:
    linear-gradient(var(--paper) 34%, rgba(255,253,248,0)) top / 100% 22px no-repeat local,
    linear-gradient(rgba(255,253,248,0), var(--paper) 66%) bottom / 100% 22px no-repeat local,
    radial-gradient(farthest-side at 50% 0, rgba(74,59,85,.18), rgba(74,59,85,0)) top / 100% 11px no-repeat scroll,
    radial-gradient(farthest-side at 50% 100%, rgba(74,59,85,.18), rgba(74,59,85,0)) bottom / 100% 11px no-repeat scroll;
}

/* 每一組設定是一張柔和底色的小卡，取代原本的虛線分隔 */
.settings-group{
  background:#FFFFFF;border:3px solid var(--line);border-radius:20px;
  padding:8px 10px 6px;margin-bottom:10px;
}
.settings-group:last-child{margin-bottom:0}
.settings-group h3{
  display:flex;align-items:center;gap:7px;margin:2px 2px 6px;
  color:var(--grape-t);font-size:1rem;letter-spacing:.03em;
}
.settings-group .gico{
  display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;flex:0 0 auto;
  border:2px solid var(--ink);border-radius:9px;background:var(--cream);font-size:.9rem;
}
.settings-note{margin:6px 4px 4px;font-size:.76rem;color:var(--ink-soft);line-height:1.5}
.setting-toggle,.setting-range,.setting-text{display:flex;align-items:center;justify-content:space-between;gap:12px;border-radius:14px;padding:8px;min-height:54px;cursor:pointer}
.setting-toggle:hover,.setting-range:hover,.setting-text:hover{background:#FAF5FF}
.setting-static{display:flex;align-items:center;justify-content:space-between;gap:12px;border-radius:14px;padding:8px;min-height:54px}
.setting-static>span:first-child,.setting-text>span:first-child{display:flex;flex-direction:column;gap:2px;font-weight:800;min-width:0}
.setting-static small,.setting-text small{color:var(--ink-soft);font-size:.73rem;font-weight:700;line-height:1.35;overflow-wrap:anywhere}
.setting-text input[type=text]{
  flex:0 1 44%;min-width:0;font:inherit;font-weight:800;
  border:3px solid var(--ink);border-radius:14px;padding:8px 12px;background:#fff;color:var(--ink);
  outline:none;min-height:46px;user-select:text;-webkit-user-select:text;
}
.setting-text input[type=text]:focus{border-color:var(--grape-d);box-shadow:0 0 0 3px rgba(164,143,219,.28)}
.server-pill{flex:0 0 auto;border:3px solid var(--ink-soft);border-radius:999px;background:#EAE4F0;color:var(--ink);padding:3px 12px;font-size:.76rem;font-weight:900}
.server-pill[data-state=ok]{border-color:var(--mint-d);background:var(--mint)}
.server-pill[data-state=fail],.server-pill[data-state=invalid]{border-color:#E39AA6;background:#FFE1E6}
.server-pill[data-state=checking]{border-color:var(--grape-d);background:var(--grape)}
.setting-toggle>span,.setting-range>span{display:flex;flex-direction:column;gap:2px;font-weight:800;min-width:0}
.setting-toggle small{color:var(--ink-soft);font-size:.73rem;font-weight:700;line-height:1.35}
.setting-toggle input[type=checkbox]{appearance:none;-webkit-appearance:none;position:relative;flex:0 0 auto;width:54px;height:31px;margin:0;border:3px solid var(--ink-soft);border-radius:999px;background:#EAE4F0;cursor:pointer;transition:background .15s,border-color .15s}
.setting-toggle input[type=checkbox]::after{content:"";position:absolute;top:2px;left:2px;width:21px;height:21px;border-radius:50%;background:#fff;box-shadow:0 2px 0 rgba(74,59,85,.2);transition:transform .15s}
.setting-toggle input[type=checkbox]:checked{border-color:var(--mint-d);background:var(--mint)}
.setting-toggle input[type=checkbox]:checked::after{transform:translateX(21px)}
.setting-toggle input:focus-visible,.setting-range input:focus-visible,.setting-text input:focus-visible,
.settings-close:focus-visible{outline:3px solid var(--sky-d);outline-offset:2px}
.setting-range>span{flex-direction:row;align-items:center;gap:6px;min-width:118px}
.setting-range output{min-width:3.2em;text-align:right;color:var(--grape-t);font-weight:900}
.setting-range input[type=range]{width:min(52%,220px);accent-color:var(--grape-d);cursor:pointer;min-height:32px}
.settings-foot{
  flex:0 0 auto;display:flex;justify-content:center;gap:10px;
  padding:10px 14px calc(10px + env(safe-area-inset-bottom));
  background:linear-gradient(0deg,#F6EEFF 0%,var(--paper) 100%);
  border-top:3px solid var(--line);border-radius:0 0 23px 23px;
}
.settings-foot .btn3d{min-height:48px}
.settings-reset{flex:0 1 auto}
.settings-done{flex:0 1 auto;min-width:120px}

/* 減少動態 */
.reduced-motion *,.reduced-motion *::before,.reduced-motion *::after{
  animation-duration:.01ms!important;animation-iteration-count:1!important;
  transition-duration:.01ms!important;scroll-behavior:auto!important;
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}

/* ---------- 主選單 ---------- */
.home-wrap{text-align:center;padding:24px 20px;width:100%;max-width:600px}
.logo{margin:0 auto 20px;max-width:480px}
.logo svg{width:100%;height:auto;display:block}
.home-btns{display:flex;flex-direction:column;gap:13px;align-items:stretch}
.home-row{display:flex;gap:12px}
.home-row .btn3d{flex:1}
.home-note{margin:18px 6px 0;font-size:.86rem;color:var(--ink-soft);font-weight:700;line-height:1.6}

/* ---------- 面板 ---------- */
.panel{
  background:var(--paper);border:3px solid var(--ink);border-radius:26px;
  box-shadow:0 10px 0 rgba(74,59,85,.16);
  width:min(760px,calc(100% - 32px));margin:20px auto;padding:16px 20px 22px;
}
.panel-head{display:flex;align-items:center;gap:10px;margin-bottom:4px}
.panel-head h2{flex:1;text-align:center;margin:6px 0;font-size:1.4rem;letter-spacing:.05em}
.panel-head .spacer{width:92px;flex:0 0 auto}
.lbl{font-size:1.02rem;margin:18px 0 10px;padding-left:12px;position:relative}
.lbl::before{content:"";position:absolute;left:0;top:.15em;width:6px;height:1.1em;border-radius:3px;background:var(--grape)}
.panel-foot{margin-top:20px;display:flex;justify-content:center}
.panel-foot.col{flex-direction:column;align-items:stretch;gap:12px}
.hint-note{font-size:.8rem;color:var(--ink-soft);text-align:center;margin:12px 4px 0;line-height:1.6}

/* ---------- 難度卡 ---------- */
.diff-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
/* 五張卡在兩欄時最後一張會落單，讓它橫跨整列比較整齊 */
.diff-row .optcard:last-child{grid-column:1 / -1}
.optcard{
  background:#fff;border:3px solid var(--ink);border-radius:20px;
  padding:13px 12px;font:inherit;color:var(--ink);cursor:pointer;text-align:left;
  box-shadow:0 6px 0 rgba(74,59,85,.14);transition:transform .1s,box-shadow .1s,background .15s;
  display:flex;flex-direction:column;gap:3px;min-height:96px;
}
.optcard:active{transform:translateY(4px);box-shadow:0 2px 0 rgba(74,59,85,.14)}
.optcard:focus-visible{outline:3px solid var(--sky-d);outline-offset:3px}
.optcard b{font-size:1.18rem}
.optcard .s{font-size:.86rem;font-weight:800;color:var(--grape-t)}
.optcard .t{font-size:.76rem;color:var(--ink-soft);line-height:1.45}
.optcard.on{background:var(--lemon);box-shadow:0 6px 0 var(--lemon-d)}
.optcard.on .s{color:var(--ink)}

.seed-row{display:flex;gap:10px;align-items:stretch;flex-wrap:wrap}
.seed-row input{
  flex:1 1 160px;min-width:0;font:inherit;font-weight:800;letter-spacing:.16em;
  border:3px solid var(--ink);border-radius:14px;padding:10px 14px;background:#fff;color:var(--ink);
  outline:none;min-height:52px;text-transform:uppercase;user-select:text;-webkit-user-select:text;
}
.seed-row input:focus{border-color:var(--grape-d);box-shadow:0 0 0 3px rgba(164,143,219,.28)}

/* ---------- 載入／錯誤狀態 ---------- */
.state-box{text-align:center;padding:30px 24px;max-width:460px;width:calc(100% - 32px);
  background:var(--paper);border:3px solid var(--ink);border-radius:26px;box-shadow:0 10px 0 rgba(74,59,85,.16)}
.state-box h2{margin:14px 0 8px;font-size:1.35rem}
.state-box p{margin:0;color:var(--ink-soft);font-weight:700;line-height:1.6}
.state-face{font-size:3rem;line-height:1}
.state-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:18px}
.spinner{width:52px;height:52px;margin:0 auto;border-radius:50%;
  border:7px solid var(--grape);border-top-color:var(--grape-t);animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- 遊戲畫面 ---------- */
#s-game.active{display:flex;flex-direction:column;overflow:hidden}
.gtop{flex:0 0 auto}
.gbar{display:flex;align-items:center;gap:8px;padding:8px 76px 0 12px}
.gmeta{flex:1;min-width:0;display:flex;gap:6px;justify-content:center;flex-wrap:wrap}
.chip{background:var(--grape);border:2px solid var(--ink);border-radius:999px;padding:3px 11px;font-size:.78rem;font-weight:800;white-space:nowrap;max-width:100%;overflow:hidden;text-overflow:ellipsis}
.chip.ghost{background:#fff;color:var(--ink-soft)}

.statbar{display:flex;gap:8px;justify-content:center;padding:8px 12px 4px;flex-wrap:wrap}
.stat{display:flex;align-items:baseline;gap:6px;background:#fff;border:3px solid var(--ink);border-radius:16px;padding:4px 12px;box-shadow:0 4px 0 rgba(74,59,85,.13)}
.stat-time{align-items:center}
.stat .k{font-size:.72rem;color:var(--ink-soft);font-weight:800}
.stat b{font-size:1.05rem;font-weight:900;font-variant-numeric:tabular-nums}
.stat-action{flex:0 0 auto;min-width:44px;min-height:44px;padding:6px 9px calc(6px + var(--d));font-size:.72rem;--d:5px}
.stat-action .b3-lbl{gap:.25em}
.stat-action .ico{font-size:1em}

.gamebody{display:flex;flex:1;min-height:0;gap:10px;padding:4px 10px 0;flex-direction:column}
.boardwrap{flex:1 1 auto;display:flex;align-items:center;justify-content:center;min-height:0;min-width:0}

.board{
  --bs:min(88vw,52dvh);
  width:var(--bs);height:var(--bs);
  display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);
  background:var(--paper);border:4px solid var(--ink);border-radius:14px;overflow:hidden;
  box-shadow:0 7px 0 rgba(74,59,85,.18);overflow:visible;
}
.board.hidden-board .cell .v,.board.hidden-board .cell .nt{visibility:hidden}

.cell{
  position:relative;border:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);
  background:#fff;font:inherit;color:var(--grape-t);cursor:pointer;padding:0;margin:0;
  display:flex;align-items:center;justify-content:center;overflow:hidden;
  transition:background .12s;overflow:visible;
}
.cell.br{border-right:3px solid var(--ink)}
.cell.bb{border-bottom:3px solid var(--ink)}
.cell:nth-child(9n){border-right:0}
.cell .v{font-size:calc(var(--bs,320px) / 9 * .62);font-weight:800;line-height:1;pointer-events:none}
.cell.given{background:#F3EEFA;color:var(--ink)}
.cell.given .v{font-weight:900}
.cell.peer{background:#FBF7FF}
.cell.same{background:#DFF6EC}
.cell.conflict{background:var(--danger-bg);color:var(--danger)}
.cell.wrong{background:var(--danger-bg);color:var(--danger)}
.cell.wrong .v{text-decoration:underline wavy var(--danger)}
.cell.sel{background:var(--lemon);color:var(--ink);box-shadow:inset 0 0 0 3px var(--grape-d)}
.cell.sel.given{background:var(--lemon-d)}
.cell:focus-visible{outline:3px solid var(--sky-d);outline-offset:-3px;z-index:2}
.cell.hinted{animation:hintglow .5s ease-in-out 3}
@keyframes hintglow{50%{background:var(--mint);box-shadow:inset 0 0 0 3px var(--mint-d)}}
.cell .nt{position:absolute;inset:8%;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);pointer-events:none}
.cell .nt i{font-style:normal;font-size:calc(var(--bs,320px) / 9 * .25);line-height:1;color:transparent;display:flex;align-items:center;justify-content:center;font-weight:800}
.cell .nt i.on{color:var(--ink-soft)}

/* 每格右上角的小三角形：點它只展開格子留言，不會改動數獨盤面 */
.cell-note-corner{position:absolute;z-index:6;top:0;right:0;width:11px;height:11px;cursor:pointer;
  opacity:.42;transition:opacity .12s;}
.cell-note-corner::before{content:"";position:absolute;inset:0;
  border-top:10px solid var(--line);border-left:10px solid transparent;}
.cell-note-corner.has-notes{opacity:1}
.cell-note-corner.has-notes::before{border-top-color:var(--grape)}
.cell-note-corner:hover,.cell-note-corner:focus-visible{opacity:1}
.cell-note-corner:focus-visible{outline:1px solid var(--sky-d);outline-offset:-1px}
.cell-note-count{position:absolute;z-index:1;top:0;right:1px;color:#fff;font-size:5px;line-height:1;font-weight:900;}
.cell-note-popover{position:absolute;z-index:30;top:calc(100% + 3px);left:-4px;
  display:flex;flex-direction:column;gap:4px;min-width:142px;max-width:min(220px,42vw);
  padding:7px 8px;background:var(--paper);border:3px solid var(--ink);border-radius:11px;
  box-shadow:0 5px 0 rgba(74,59,85,.22);font-size:11px;line-height:1.25;text-align:left;
  color:var(--ink);pointer-events:none;}
.cell.note-right .cell-note-popover{left:auto;right:-4px}
.cell.note-bottom .cell-note-popover{top:auto;bottom:calc(100% + 3px)}
.cell-note-popover-title{font-size:11px;color:var(--grape-t);white-space:nowrap}
.cell-note-items{display:flex;flex-direction:column;gap:4px;max-height:130px;overflow-y:auto}
.cell-note-item{display:flex;flex-direction:column;gap:1px;padding-top:3px;border-top:1px dashed var(--line);overflow-wrap:anywhere}
.cell-note-item:first-child{border-top:0;padding-top:0}
.cell-note-item b{font-size:9px;color:var(--ink-soft)}
.cell-note-empty{color:var(--ink-soft);font-weight:700;white-space:nowrap}

/* 數字盤與工具列 */
.padwrap{display:flex;flex-direction:column;gap:8px;flex:0 0 auto;padding-bottom:2px}
.tools{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:7px}
.tools .btn3d{min-height:52px;padding:7px 6px calc(7px + var(--d));font-size:.82rem;--d:6px}
.tools .btn3d .b3-lbl{flex-direction:column;gap:1px}
.tools .ico{font-size:1.15rem;line-height:1}
.tools .tag{font-size:.66rem;color:var(--ink-soft);font-weight:800}
.tools .tool.on{outline:3px solid var(--grape-t);outline-offset:2px;filter:saturate(1.25)}
.tools .tool.on .tag{padding:1px 5px;color:var(--ink);background:var(--lemon);border:2px solid var(--ink);border-radius:999px}
.numpad{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:7px}
.numkey{--d:7px;min-height:58px;padding:8px 4px calc(8px + var(--d))}
.numkey .b3-lbl{flex-direction:column;gap:0}
.numkey .nk{font-size:1.5rem;font-weight:900;line-height:1.05}
.numkey .nleft{font-size:.66rem;font-weight:800;color:#5C4A6B;opacity:.75;line-height:1}
.numkey.done .nk{opacity:.4}
.hide-remaining .numkey .nleft{display:none}

.gfoot{padding:6px 12px calc(8px + env(safe-area-inset-bottom))}
.feedback{margin:0;text-align:center;font-size:.86rem;font-weight:800;color:var(--ink-soft);
  min-height:2.6em;line-height:1.35;display:flex;align-items:center;justify-content:center;
  background:#fff;border:2px solid var(--line);border-radius:14px;padding:6px 12px}
.feedback.good{color:var(--grape-t);border-color:var(--grape)}
.feedback.warn{color:#B77B21;border-color:var(--lemon-d);background:#FFF9EA}
.feedback.bad{color:var(--danger);border-color:var(--danger);background:var(--danger-bg)}

/* 暫停遮罩 */
.overlay{position:absolute;inset:0;display:none;align-items:center;justify-content:center;background:rgba(74,59,85,.34);backdrop-filter:blur(3px);z-index:40;padding:20px}
.overlay.on{display:flex}
.ovbox{background:var(--paper);border:4px solid var(--ink);border-radius:28px;padding:24px 28px;text-align:center;box-shadow:0 12px 0 rgba(74,59,85,.24);max-width:420px;width:100%;outline:none}
.ovbox h2{margin:0 0 6px;font-size:1.5rem}
.ovbox p{margin:0 0 4px;color:var(--ink-soft);font-weight:700}

.toast{position:absolute;left:50%;top:14%;transform:translate(-50%,-14px);z-index:50;
  background:var(--ink);color:#fff;font-weight:800;padding:11px 20px;border-radius:999px;opacity:0;
  transition:opacity .25s,transform .25s;pointer-events:none;max-width:82vw;text-align:center;font-size:.88rem}
.toast.on{opacity:.95;transform:translate(-50%,0)}

/* ---------- 結算 ---------- */
.panel.result{max-width:500px;text-align:center;margin-top:6vh}
.restrophy{width:96px;margin:0 auto}
.restrophy svg{width:100%;height:auto;display:block}
.panel.result h2{font-size:1.6rem;margin:8px 0 4px}
.res-sub{margin:0 0 14px;color:var(--ink-soft);font-weight:700;font-size:.9rem}
.resstats{display:flex;flex-direction:column;gap:8px;font-weight:700;text-align:left}
.resstats .row{display:flex;justify-content:space-between;gap:10px;background:#fff;border:3px solid var(--ink);border-radius:16px;padding:9px 14px;font-size:.92rem}
.resstats .row b{text-align:right;overflow-wrap:anywhere}
.resstats .row.best{background:var(--lemon);box-shadow:0 4px 0 var(--lemon-d)}

/* ---------- 紀錄 ---------- */
.ranklist{display:flex;flex-direction:column;gap:12px}
.rankgrp{background:#fff;border:3px solid var(--ink);border-radius:20px;padding:12px 16px;box-shadow:0 5px 0 rgba(74,59,85,.13)}
.rankgrp h4{margin:0 0 8px;font-size:1.08rem;color:var(--grape-t)}
.rankgrp .r{display:flex;justify-content:space-between;gap:10px;font-weight:700;padding:5px 0;border-bottom:2px dashed var(--line);font-size:.9rem}
.rankgrp .r:last-child{border:0}
.rankgrp .empty-row{color:var(--ink-soft)}

/* ---------- 教學 ---------- */
.tut{background:#fff;border:3px solid var(--ink);border-radius:20px;padding:14px 16px;box-shadow:0 5px 0 rgba(74,59,85,.13)}
.tut-progress{font-size:.78rem;font-weight:800;color:var(--grape-t);margin-bottom:6px}
.tut h3{margin:0 0 10px;font-size:1.2rem}
.tut-body p{margin:0 0 10px;line-height:1.85;font-size:.95rem}
.tut-body p:last-child{margin-bottom:0}
.tut-foot{display:flex;gap:10px;justify-content:space-between;margin-top:14px}
.tut-foot .btn3d{flex:1}

/* ---------- 只給螢幕閱讀器看的文字 ---------- */
.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}

/* ---------- 線上觀戰大廳 ---------- */
.lobby-off{text-align:center;padding:10px 6px 4px}
.lobby-off .state-face{font-size:2.6rem;line-height:1}
.lobby-off h3{margin:8px 0 6px;font-size:1.15rem}
.lobby-off p{margin:0 auto;max-width:34em;color:var(--ink-soft);font-weight:700;line-height:1.65;font-size:.9rem}
.lobby-help{margin:14px auto 0;max-width:34em;text-align:left;background:#fff;border:3px solid var(--line);border-radius:18px;padding:8px 12px}
.lobby-help summary{font-weight:900;color:var(--grape-t);cursor:pointer;min-height:32px;display:flex;align-items:center}
.lobby-help p{margin:6px 0;font-size:.82rem;text-align:left;line-height:1.7}
.lobby-help code{background:#F3EEFA;border:1px solid var(--line);border-radius:6px;padding:1px 5px;font-size:.86em;overflow-wrap:anywhere}

.lobby-me{display:flex;gap:12px;align-items:flex-end;flex-wrap:wrap;margin-top:6px}
.lobby-nick{flex:1 1 200px;display:flex;flex-direction:column;gap:5px;font-weight:800;font-size:.86rem;min-width:0}
.lobby-nick input,.lobby-join input{
  font:inherit;font-weight:800;border:3px solid var(--ink);border-radius:14px;padding:10px 14px;
  background:#fff;color:var(--ink);outline:none;min-height:52px;width:100%;
  user-select:text;-webkit-user-select:text;
}
.lobby-nick input:focus,.lobby-join input:focus{border-color:var(--grape-d);box-shadow:0 0 0 3px rgba(164,143,219,.28)}
.lobby-me .btn3d{flex:0 0 auto}
.lobby-join{display:flex;gap:10px;align-items:stretch;margin-top:14px;flex-wrap:wrap}
.lobby-join input{flex:1 1 160px;letter-spacing:.24em;text-transform:uppercase;text-align:center}
.lobby-join .btn3d{flex:0 0 auto}
.lobby-bar{display:flex;align-items:center;gap:10px;justify-content:space-between;flex-wrap:wrap}
.lobby-bar .lbl{margin:16px 0 8px;flex:1 1 auto}
.lobby-state{
  margin:0 0 10px;padding:9px 14px;border-radius:14px;font-size:.85rem;font-weight:800;line-height:1.5;
  background:#fff;border:3px solid var(--line);color:var(--ink-soft);
}
.lobby-state[data-state=loading]{border-color:var(--grape);color:var(--grape-t)}
.lobby-state[data-state=waking]{border-color:var(--lemon-d);background:#FFF9EA;color:#B77B21}
.lobby-state[data-state=error]{border-color:var(--danger);background:var(--danger-bg);color:var(--danger)}
.lobby-state[data-state=ok]{border-color:var(--mint-d);background:#EDFBF5;color:#1F7A5C}

.roomlist{display:grid;grid-template-columns:1fr;gap:10px}
.roomcard{
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;text-align:left;
  background:#fff;border:3px solid var(--ink);border-radius:20px;padding:11px 14px;
  box-shadow:0 6px 0 rgba(74,59,85,.14);font:inherit;color:var(--ink);cursor:pointer;
  transition:transform .1s,box-shadow .1s,background .15s;min-height:76px;width:100%;
}
.roomcard:active{transform:translateY(4px);box-shadow:0 2px 0 rgba(74,59,85,.14)}
.roomcard:focus-visible{outline:3px solid var(--sky-d);outline-offset:3px}
.roomcard:hover{background:#FBF7FF}
.roomcard .rc-code{
  flex:0 0 auto;display:flex;align-items:center;justify-content:center;min-width:66px;height:46px;
  border:3px solid var(--ink);border-radius:14px;background:var(--lemon);box-shadow:0 3px 0 var(--lemon-d);
  font-weight:900;font-size:1.15rem;letter-spacing:.12em;
}
.roomcard .rc-main{flex:1 1 150px;min-width:0;display:flex;flex-direction:column;gap:3px}
.roomcard .rc-host{font-weight:900;font-size:1rem;overflow-wrap:anywhere}
.roomcard .rc-meta{display:flex;gap:6px;flex-wrap:wrap;font-size:.74rem;font-weight:800;color:var(--ink-soft)}
.roomcard .rc-tag{border:2px solid var(--line);border-radius:999px;padding:1px 9px;background:#FAF7FF}
.roomcard .rc-tag.live{background:var(--mint);border-color:var(--mint-d);color:var(--ink)}
.roomcard .rc-tag.done{background:var(--cream);border-color:var(--cream-d)}
.roomcard .rc-tag.off{background:#FFE1E6;border-color:#E39AA6;color:var(--danger)}
.roomcard .rc-go{flex:0 0 auto;font-weight:900;color:var(--grape-t);font-size:.88rem}
.roomcard .rc-bar{flex:1 1 100%;height:9px;border:2px solid var(--ink);border-radius:999px;background:#F1ECF7;overflow:hidden}
.roomcard .rc-bar i{display:block;height:100%;background:var(--grape);border-right:2px solid var(--grape-d)}
.rooms-empty{
  text-align:center;padding:22px 16px;background:#fff;border:3px dashed var(--line);border-radius:20px;
  color:var(--ink-soft);font-weight:800;font-size:.88rem;line-height:1.7;
}

/* ---------- 開房中的主持人資訊列 ---------- */
.hostbar{display:flex;align-items:center;gap:7px;justify-content:center;flex-wrap:wrap;padding:2px 12px 4px}
.hostbar .btn3d.small{min-height:44px;font-size:.78rem;padding:7px 12px calc(7px + var(--d));--d:5px}
.host-codebox{
  display:flex;align-items:center;gap:9px;flex:0 1 auto;min-height:52px;padding:4px 8px 4px 13px;
  background:var(--mint);border:3px solid var(--ink);border-radius:17px;box-shadow:0 5px 0 rgba(74,59,85,.14)
}
.host-code-label{font-size:.78rem;font-weight:900;color:var(--ink-soft);white-space:nowrap}
.host-codebox #h-code{
  color:var(--ink);font-size:1.35rem;font-weight:900;letter-spacing:.16em;line-height:1;white-space:nowrap
}
.host-codebox .host-code-copy{min-height:40px;font-size:.72rem;padding:6px 10px calc(6px + var(--d));--d:5px}
.chip.live{background:var(--mint);border-color:var(--mint-d)}
.chip[data-state=fail],.chip[data-state=failed]{background:#FFE1E6;border-color:#E39AA6;color:var(--danger)}
.chip[data-state=retrying],.chip[data-state=waking],.chip[data-state=connecting]{background:var(--lemon);border-color:var(--lemon-d)}

/* ---------- 觀戰畫面 ---------- */
.board.readonly{cursor:default}
.board.readonly .cell{cursor:default}
.board.readonly .cell.sel{box-shadow:inset 0 0 0 3px var(--peach-d);background:var(--peach)}
.watchbody{gap:12px}
#s-watch.active{display:flex;flex-direction:column;overflow:hidden}
#s-watch .gbar .spacer{width:56px;flex:0 0 auto}

/* 操作 Summary：與聊天室同在左側，窄版收合；主要盤面取得剩餘空間 */
.summary{
  flex:0 0 auto;background:var(--paper);border:3px solid var(--ink);border-radius:20px;
  box-shadow:0 6px 0 rgba(74,59,85,.14);padding:10px 12px;overflow-y:auto;min-height:0;
}
.sum-head{display:flex;align-items:center;gap:8px}
.sum-head h3{flex:1;margin:0;font-size:1rem;color:var(--grape-t)}
.sum-toggle{
  flex:0 0 auto;min-height:36px;padding:4px 12px;border:3px solid var(--ink);border-radius:12px;
  background:var(--cream);color:var(--ink);font:inherit;font-weight:800;font-size:.78rem;cursor:pointer;
  box-shadow:0 3px 0 var(--cream-d);
}
.sum-toggle:active{transform:translateY(2px);box-shadow:0 1px 0 var(--cream-d)}
.sum-toggle:focus-visible{outline:3px solid var(--sky-d);outline-offset:2px}
.sum-body{margin-top:8px}
.summary.collapsed .sum-body{display:none}
.sum-row{display:flex;justify-content:space-between;gap:10px;align-items:baseline;
  padding:6px 2px;border-bottom:2px dashed var(--line);font-size:.84rem;font-weight:700}
.sum-row:last-of-type{border-bottom:0}
.sum-row span{color:var(--ink-soft);flex:0 0 auto}
.sum-row b{text-align:right;overflow-wrap:anywhere;font-weight:900}
.sum-note{margin:8px 0 0;font-size:.76rem;color:var(--ink-soft);line-height:1.6;
  background:#FBF7FF;border:2px solid var(--line);border-radius:12px;padding:7px 10px}
.sum-note.warn{background:#FFF9EA;border-color:var(--lemon-d);color:#8A6420}

.watch-note-tools{margin-top:10px;padding-top:10px;border-top:3px dashed var(--line)}
.watch-note-head{display:flex;align-items:baseline;justify-content:space-between;gap:8px}
.watch-note-head h3{margin:0;color:var(--grape-t);font-size:.94rem}
.watch-note-head b{font-size:.8rem;color:var(--ink-soft)}
.watch-note-help,.watch-note-limit{margin:5px 0 0;color:var(--ink-soft);font-size:.73rem;line-height:1.5;font-weight:700}
.watch-note-form{display:flex;gap:6px;margin-top:8px;align-items:stretch}
.watch-note-form input{min-width:0;flex:1 1 auto;width:100%;min-height:44px;padding:7px 9px;border:3px solid var(--ink);border-radius:12px;
  font:inherit;font-size:.8rem;font-weight:800;color:var(--ink);background:#fff;outline:none;}
.watch-note-form input:focus{border-color:var(--grape-d);box-shadow:0 0 0 3px rgba(164,143,219,.28)}
.watch-note-form .btn3d{flex:0 0 auto;min-height:44px;padding-left:10px;padding-right:10px;font-size:.74rem}
.watch-note-list{display:flex;flex-direction:column;gap:5px;margin-top:8px}
.watch-note-item{display:flex;flex-direction:column;gap:1px;padding:6px 8px;background:#fff;border:2px solid var(--line);border-radius:10px;
  font-size:.78rem;line-height:1.35;overflow-wrap:anywhere}
.watch-note-item.mine{border-color:var(--grape-d);background:#FBF7FF}
.watch-note-item b{font-size:.68rem;color:var(--ink-soft)}
.watch-note-empty{margin:0;padding:7px 8px;border:2px dashed var(--line);border-radius:10px;color:var(--ink-soft);font-size:.74rem;font-weight:800}

/* ---------- 房間留言板：錨定左下角 ---------- */
.chat-fab{
  position:fixed;z-index:65;
  left:calc(12px + env(safe-area-inset-left));
  bottom:calc(12px + env(safe-area-inset-bottom));
  --d:6px;min-width:56px;min-height:56px;
}
.chat-fab.chat-fab-hidden{display:none}
.chat-fab .b3-lbl{font-size:1.35rem}
.chat-badge{
  position:absolute;top:-11px;right:-13px;min-width:24px;height:24px;padding:0 5px;
  display:flex;align-items:center;justify-content:center;
  background:var(--rose);border:3px solid var(--ink);border-radius:999px;
  font-size:.72rem;font-weight:900;color:var(--ink);line-height:1;
}
.chat-backdrop{position:fixed;inset:0;z-index:58;background:rgba(74,59,85,.3);backdrop-filter:blur(2px)}
.chat-panel{
  position:fixed;z-index:60;display:none;flex-direction:column;
  left:calc(12px + env(safe-area-inset-left));
  bottom:calc(12px + env(safe-area-inset-bottom));
  width:min(340px,calc(100vw - 24px));max-height:min(62dvh,520px);
  background:var(--paper);border:3px solid var(--ink);border-radius:22px;
  box-shadow:0 10px 0 rgba(74,59,85,.2);overflow:hidden;
}
.chat-panel.open{display:flex}
.chat-head{
  flex:0 0 auto;display:flex;align-items:center;gap:8px;padding:9px 10px;
  background:linear-gradient(180deg,#EDFBF5,var(--paper));border-bottom:3px solid var(--line);
}
.chat-head h3{flex:0 0 auto;margin:0;font-size:.95rem;color:#1F7A5C}
.chat-room{flex:1 1 auto;min-width:0;font-size:.74rem;font-weight:900;color:var(--ink-soft);text-align:right;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chat-close{flex:0 0 auto;width:40px;height:40px;border:3px solid var(--ink);border-radius:50%;background:var(--cream);color:var(--ink);font:inherit;font-weight:900;cursor:pointer;box-shadow:0 3px 0 var(--cream-d)}
.chat-close:active{transform:translateY(2px);box-shadow:0 1px 0 var(--cream-d)}
.chat-close:focus-visible,.chat-form input:focus-visible{outline:3px solid var(--sky-d);outline-offset:2px}
.chat-conn{
  flex:0 0 auto;margin:0;padding:5px 12px;font-size:.74rem;font-weight:800;
  background:#F6F2FB;color:var(--ink-soft);border-bottom:2px solid var(--line);
}
.chat-conn[data-state=open]{background:#EDFBF5;color:#1F7A5C}
.chat-conn[data-state=retrying],.chat-conn[data-state=connecting],.chat-conn[data-state=waking]{background:#FFF9EA;color:#B77B21}
.chat-conn[data-state=failed],.chat-conn[data-state=closed]{background:var(--danger-bg);color:var(--danger)}
.chat-log{
  flex:1 1 auto;min-height:80px;overflow-y:auto;overscroll-behavior:contain;scrollbar-gutter:stable;
  padding:8px 10px;display:flex;flex-direction:column;gap:7px;
  scrollbar-width:thin;scrollbar-color:var(--grape-d) transparent;
}
.chat-log::-webkit-scrollbar{width:10px}
.chat-log::-webkit-scrollbar-track{background:transparent;margin:4px 0}
.chat-log::-webkit-scrollbar-thumb{background:var(--grape);border:2px solid var(--ink);border-radius:999px}
.chat-msg{background:#fff;border:2px solid var(--line);border-radius:14px;padding:6px 10px;font-size:.84rem;line-height:1.55}
.chat-msg .who{display:block;font-size:.7rem;font-weight:900;color:var(--grape-t);margin-bottom:1px}
.chat-msg .tx{display:block;font-weight:700;overflow-wrap:anywhere;white-space:pre-wrap}
.chat-msg.host{background:#FFF6E4;border-color:var(--lemon-d)}
.chat-msg.host .who{color:#B77B21}
.chat-msg.me{background:#EDFBF5;border-color:var(--mint-d)}
.chat-msg.system{background:#F3EEFA;border-style:dashed;color:var(--ink-soft);font-size:.78rem;text-align:center}
.chat-msg.system .tx{font-weight:800}
.chat-msg.pending{opacity:.6}
.chat-msg.failed{background:var(--danger-bg);border-color:var(--danger)}
.chat-empty{margin:auto;text-align:center;color:var(--ink-soft);font-size:.82rem;font-weight:800;line-height:1.7;padding:10px}
.chat-form{flex:0 0 auto;display:flex;gap:7px;padding:8px 10px 0}
.chat-form input{
  flex:1 1 auto;min-width:0;font:inherit;font-weight:700;font-size:.9rem;
  border:3px solid var(--ink);border-radius:14px;padding:8px 12px;background:#fff;color:var(--ink);
  outline:none;min-height:48px;user-select:text;-webkit-user-select:text;
}
.chat-form input:focus{border-color:var(--grape-d);box-shadow:0 0 0 3px rgba(164,143,219,.28)}
.chat-form .btn3d.small{flex:0 0 auto;min-height:48px;--d:5px}
.chat-note{flex:0 0 auto;margin:0;padding:5px 12px 9px;font-size:.7rem;color:var(--ink-soft);font-weight:700;line-height:1.45}
.chat-note.bad{color:var(--danger)}

/* ---------- 平板／桌機：橫向時盤面在左、輸入在右 ---------- */
@media (orientation:landscape){
  .gamebody{flex-direction:row;align-items:stretch}
  .padwrap{width:clamp(168px,26vw,300px);justify-content:center}
  .tools{grid-template-columns:repeat(3,minmax(0,1fr))}
  .numpad{grid-template-columns:repeat(3,minmax(0,1fr))}
  .numkey{min-height:52px}
}
/* 矮橫向（手機橫拿）：把標題列與數據列併成同一排，把高度讓給盤面 */
@media (orientation:landscape) and (max-height:520px){
  .settings-fab{top:calc(2px + env(safe-area-inset-top));--d:5px}
  .settings-fab.btn3d.icononly{min-height:44px;min-width:44px;padding:6px 9px calc(6px + var(--d))}
  .lang-toggle{top:calc(2px + env(safe-area-inset-top));right:calc(12px + 44px + 8px + env(safe-area-inset-right));width:44px;height:39px;border-radius:14px;box-shadow:0 5px 0 var(--cream-d);font-size:.85rem}
  .gtop{display:flex;align-items:center;gap:8px;padding:4px 122px 0 8px}
  .gbar{flex:0 0 auto;padding:0;gap:6px}
  .statbar{flex:1;min-width:0;justify-content:flex-end;padding:0;gap:6px;flex-wrap:nowrap;overflow:hidden}
  #g-seed,#g-tech{display:none}
  .stat{padding:2px 9px;border-width:2px}
  .stat b{font-size:.92rem}
  .stat .k{font-size:.64rem}
  .gamebody{padding:2px 7px 0;gap:8px}
  /* 右上角固定的設定鈕會壓在輸入區上方，這裡把它的高度讓出來 */
  .padwrap{padding-top:calc(26px + env(safe-area-inset-top));min-height:0;overflow-y:auto;justify-content:flex-start}
  .gfoot{padding:2px 10px calc(4px + env(safe-area-inset-bottom))}
  .feedback{min-height:1.7em;font-size:.74rem;padding:3px 8px;border-radius:11px}
  .numkey{min-height:44px;--d:6px}
  .numkey .nk{font-size:1.25rem}
  .tools .btn3d{min-height:44px;font-size:.74rem}
  .btn3d.small{min-height:42px}
  /* 五張難度卡在矮橫向壓成一行式，維持 44px 以上命中區 */
  .diff-row{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .optcard{min-height:52px;padding:8px 10px;flex-direction:row;align-items:center;flex-wrap:wrap;gap:2px 8px}
  .optcard b{flex:0 0 auto;font-size:1rem}
  .optcard .s{flex:1 1 auto;text-align:right;font-size:.76rem}
  .optcard .t{flex:1 1 100%;font-size:.68rem;line-height:1.35}
}

/* 面板寬度撐滿螢幕時，標題列右側要讓開固定在右上角的設定按鈕 */
@media (max-width:820px){
  .panel-head{padding-right:calc(50px + env(safe-area-inset-right))}
  .panel-head .spacer{display:none}
}

/* ---------- 桌機寬版：面板置中、留白多一點 ---------- */
@media (min-width:1100px){
  .panel{padding:20px 28px 26px}
  #s-setup .panel{width:min(1060px,calc(100% - 32px))}
  .diff-row{grid-template-columns:repeat(5,minmax(0,1fr))}
  .diff-row .optcard:last-child{grid-column:auto}
  .optcard .t{font-size:.74rem}
  /* 桌機盤面依可用高度放大，容器收縮後不會在棋盤與輸入區之間留下大片空白 */
  .gamebody{padding:6px 24px 0;gap:22px;justify-content:center;width:100%;max-width:1120px;margin:0 auto}
  .boardwrap{flex:0 0 auto;width:min(52vw,72dvh,720px)}
  .board{--bs:min(52vw,72dvh,720px)}
  .padwrap{width:300px;justify-content:center}
  .numkey{min-height:66px}
  .numkey .nk{font-size:1.7rem}
  .numkey .nleft{font-size:.72rem}
  .tools .btn3d{min-height:62px;font-size:.88rem}
  .tools .ico{font-size:1.3rem}
  .feedback{font-size:.95rem}
}

/* 中等寬度（平板橫向、小筆電）：難度卡改三欄，總高度不會拖太長 */
@media (min-width:900px) and (max-width:1099px){
  .diff-row{grid-template-columns:repeat(3,minmax(0,1fr))}
  .diff-row .optcard:last-child{grid-column:auto}
}

/* ---------- 平板直向 ---------- */
@media (orientation:portrait) and (min-width:700px){
  .board{--bs:min(74vw,58dvh)}
  .numpad{grid-template-columns:repeat(9,minmax(0,1fr))}
  .numkey{min-height:64px}
  .tools .btn3d{min-height:58px;font-size:.9rem}
  .gamebody{padding:6px 28px 0}
  .padwrap{max-width:720px;width:100%;margin:0 auto}
}

/* ---------- 手機窄版 ---------- */
@media (max-width:560px){
  .settings-fab{top:calc(7px + env(safe-area-inset-top));right:calc(8px + env(safe-area-inset-right));--d:5px}
  .settings-fab.btn3d.icononly{min-width:48px;min-height:48px;padding:8px 10px calc(8px + var(--d))}
  .lang-toggle{top:calc(7px + env(safe-area-inset-top));right:calc(8px + 48px + 8px + env(safe-area-inset-right));width:48px;height:43px;border-radius:15px;box-shadow:0 5px 0 var(--cream-d)}
  .settings-modal{padding:10px}
  .settings-panel{width:100%;max-height:92dvh;border-radius:22px}
  .settings-head{padding:9px 10px 8px}
  .settings-badge{width:34px;height:34px}
  .settings-head h2{font-size:1.16rem}
  .settings-body{padding:8px 8px 10px}
  .settings-group{padding:6px 7px 4px;border-radius:17px}
  .settings-foot{padding:8px 10px calc(8px + env(safe-area-inset-bottom))}
  .settings-head h2{font-size:1.2rem}
  .room-info-modal{padding:10px}
  .room-info-panel{width:100%;max-height:92dvh;border-radius:22px}
  .room-info-head{padding:9px 10px 8px}
  .room-info-badge{width:34px;height:34px}
  .room-info-head h2{font-size:1.16rem}
  .room-info-body{padding:8px 8px 12px}
  .room-info-note{font-size:.76rem;padding:8px 10px}
  .setting-toggle,.setting-range,.setting-text,.setting-static{padding-left:4px;padding-right:4px;gap:8px}
  .setting-range input[type=range]{width:44%}
  .panel{width:calc(100% - 20px);margin:12px auto 20px;padding:14px 13px 20px;border-radius:22px}
  .panel-head h2{font-size:1.2rem}
  .panel-head .spacer{width:56px}
  .diff-row{grid-template-columns:1fr}
  .optcard{min-height:0;flex-direction:row;align-items:center;flex-wrap:wrap;gap:4px 10px}
  .optcard b{flex:0 0 auto}
  .optcard .s{flex:1 1 auto;text-align:right}
  .optcard .t{flex:1 1 100%}
  .logo{max-width:330px}
  .home-wrap{padding:20px 14px}
  .btn3d.big{font-size:1.15rem;min-height:62px}
  .gbar{padding:6px 62px 0 8px;gap:6px}
  /* 窄版把標題列壓成一排，多出來的高度留給盤面；技巧名稱在結算畫面仍看得到 */
  .gmeta{gap:4px;flex-wrap:nowrap}
  .chip{font-size:.7rem;padding:2px 9px;flex:0 1 auto;min-width:0}
  #g-tech{display:none}
  .statbar{gap:6px;padding:6px 8px 2px}
  .stat{padding:3px 9px;border-width:2px}
  .stat-time{gap:4px;padding-left:6px;padding-right:6px}
  .stat-action{min-width:44px;min-height:44px;padding:5px 7px calc(5px + var(--d));font-size:.68rem}
  .stat-action-label{display:none}
  .stat .k{font-size:.66rem}
  .stat b{font-size:.95rem}
  .gamebody{padding:4px 7px 0;gap:8px}
  .board{--bs:min(94vw,50dvh);border-width:3px}
  .tools{gap:5px}
  .tools .btn3d{min-height:50px;font-size:.72rem;padding:6px 2px calc(6px + var(--d))}
  .tools .tx{font-size:.72rem}
  .numpad{gap:5px}
  .numkey{min-height:52px}
  .numkey .nk{font-size:1.3rem}
  .gfoot{padding:5px 8px calc(6px + env(safe-area-inset-bottom))}
  .feedback{font-size:.78rem;min-height:2.4em}
  .hostbar{gap:6px;padding:4px 8px 6px}
  .host-codebox{flex:1 1 100%;justify-content:center;min-height:54px;padding:5px 8px 5px 12px}
  .host-codebox #h-code{font-size:1.25rem}
  .tut-foot{flex-direction:column}
  .panel.result{margin-top:2vh}
  .resstats .row{font-size:.85rem;padding:8px 11px}
}

/* 手機／平板遊戲控制：保留觸控命中區，把省下的高度還給棋盤 */
@media (max-width:820px){
  #s-game .gbar .btn3d{min-height:44px;font-size:.8rem;padding:7px 12px calc(7px + var(--d));--d:5px}
  #s-game .gbar .btn3d .ico{font-size:1rem}
  #s-game .gamebody{gap:5px}
  #s-game .tools{gap:4px}
  #s-game .tools .btn3d{min-height:44px;font-size:.66rem;padding:3px 1px calc(3px + var(--d));--d:5px}
  #s-game .tools .ico{font-size:1rem}
  #s-game .tools .tag{font-size:.58rem}
  #s-game .numpad{gap:4px}
  #s-game .numkey{min-height:46px;padding:4px 2px calc(4px + var(--d));--d:5px}
  #s-game .numkey .nk{font-size:1.2rem}
  #s-game .numkey .nleft{font-size:.6rem}
  #s-game .gfoot{padding:3px 6px calc(4px + env(safe-area-inset-bottom))}
  #s-game .feedback{font-size:.74rem;min-height:2em;padding:4px 8px;border-radius:12px}
}

/* 矮橫向手機：控制列再壓低，讓棋盤和完整數字盤同時留在視線內 */
@media (orientation:landscape) and (max-height:520px){
  #s-game .gtop{padding-top:0}
  #s-game .gbar{padding:0 62px 0 6px;gap:4px}
  #s-game .gbar .btn3d{min-height:44px;font-size:.68rem;padding:4px 8px calc(4px + var(--d));--d:4px}
  #s-game .gmeta{gap:3px}
  #s-game .chip{font-size:.64rem;padding:1px 7px}
  #s-game .statbar{gap:4px;padding:1px 6px 0}
  #s-game .stat{padding:1px 6px;border-width:2px}
  #s-game .stat-time{height:44px;padding-top:0;padding-bottom:0}
  #s-game .stat .k{font-size:.6rem}
  #s-game .stat b{font-size:.84rem}
  #s-game .gamebody{padding:0 6px;gap:6px}
  #s-game .padwrap{width:clamp(156px,23vw,240px);gap:5px}
  #s-game .tools{gap:3px}
  #s-game .tools .btn3d{min-height:44px;font-size:.62rem;padding:3px 1px calc(3px + var(--d));--d:4px}
  #s-game .tools .ico{font-size:.88rem}
  #s-game .tools .tag{font-size:.52rem}
  #s-game .numpad{gap:3px}
  #s-game .numkey{min-height:44px;padding:3px 1px calc(3px + var(--d));--d:4px}
  #s-game .numkey .nk{font-size:1.12rem}
  #s-game .numkey .nleft{font-size:.56rem}
  #s-game .gfoot{padding:0 6px calc(2px + env(safe-area-inset-bottom))}
  #s-game .feedback{min-height:1.5em;font-size:.68rem;padding:2px 6px;border-radius:10px}
}

/* 平板橫向：標題／底部提示讓出一點高度，棋盤優先 */
@media (orientation:landscape) and (min-width:821px) and (max-width:1099px){
  #s-game .gbar{padding:4px 68px 0 10px}
  #s-game .statbar{gap:5px;padding:4px 10px 2px}
  #s-game .stat{padding:3px 8px}
  #s-game .gamebody{padding:2px 10px 0;gap:10px}
  #s-game .gfoot{padding:3px 8px calc(4px + env(safe-area-inset-bottom))}
  #s-game .feedback{min-height:1.9em;font-size:.8rem;padding:4px 9px}
}

/* 更窄的手機：種子改在結算畫面顯示，標題列只留難度 */
@media (max-width:400px){
  #g-seed{display:none}
  .statbar{gap:5px}
  .stat{padding:2px 8px}
}

/* 直向手機：主選單從上方開始排，避免小畫面被裁切 */
@media (orientation:portrait) and (max-width:560px){
  .screen.flexcenter.active{align-items:flex-start}
  .home-wrap{padding-top:clamp(52px,10dvh,96px)}
  #s-loading.active,#s-error.active{align-items:center}
}

/* 極矮視窗：允許遊戲畫面捲動，不要硬擠 */
@media (max-height:420px) and (orientation:portrait){
  #s-game.active{overflow-y:auto}
  .board{--bs:min(92vw,44dvh)}
}

/* ============================================================
 * 線上觀戰相關畫面的 RWD
 * 版面策略：
 *   - 窄版（直向手機）：Summary 靠左收合在盤面上方，盤面使用其餘高度；留言板是左下浮動入口＋底部面板。
 *   - 平板橫向與桌機：左側資訊欄由 Summary 在上、聊天室在下，盤面吃滿剩餘寬度。
 *   - 右上角設定按鈕與彈窗永遠在最上層（z-index 70／100），留言板是 58–65，不會蓋住它。
 * ========================================================== */

/* 預設（含直向）：Summary 靠左置於盤面上方，收合後只留下精簡標題列 */
.watchbody{flex-direction:column}
.watchbody .summary{order:-1;align-self:flex-start;width:min(100%,360px);max-height:34dvh}
.watchbody .boardwrap{order:1;min-width:0}

/* 橫向：Summary 在左側資訊欄，盤面取得所有剩餘空間 */
@media (orientation:landscape){
  #s-watch{--watch-rail-w:clamp(220px,24vw,300px)}
  .watchbody{flex-direction:row;align-items:stretch;justify-content:stretch;width:100%;max-width:none;margin:0;padding:6px 14px 0;gap:18px}
  .watchbody .summary{width:var(--watch-rail-w);flex:0 0 var(--watch-rail-w);max-height:none}
  .watchbody .boardwrap{flex:1 1 auto;min-width:0}
  .watchbody .board{--bs:min(90vw,64dvh)}
  #s-watch.active ~ .chat-fab{left:calc(clamp(220px,24vw,300px) + 14px + env(safe-area-inset-left))}
  #s-watch.active ~ .chat-panel{left:calc(clamp(220px,24vw,300px) + 14px + env(safe-area-inset-left))}
}

/* 桌機寬版：左側資訊欄固定寬度，盤面不再被 max-width 容器限制 */
@media (min-width:1100px){
  #s-watch{--watch-rail-w:300px}
  .watchbody{padding:6px 18px 0;gap:18px;justify-content:stretch;width:100%;max-width:none;margin:0}
  .watchbody .summary{width:var(--watch-rail-w);flex-basis:var(--watch-rail-w);padding:14px 16px}
  .sum-row{font-size:.9rem;padding:7px 2px}
  .chat-panel{width:360px;max-height:min(66dvh,600px)}
  #s-watch.active ~ .chat-fab{left:calc(300px + 18px + env(safe-area-inset-left))}
  #s-watch.active ~ .chat-panel{left:calc(300px + 18px + env(safe-area-inset-left))}
  .roomlist{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* 平板直向：Summary 給多一點高度，房間列表兩欄 */
@media (orientation:portrait) and (min-width:700px){
  .watchbody{padding:6px 28px 0}
  .watchbody .summary{max-height:40dvh;width:min(100%,380px)}
  .roomlist{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* 手機窄版：留言板改成貼齊底部的面板（仍由左下角入口開啟），並加上遮罩 */
@media (max-width:560px){
  .chat-fab{left:calc(8px + env(safe-area-inset-left));bottom:calc(8px + env(safe-area-inset-bottom));--d:5px;min-width:52px;min-height:52px}
  .chat-panel{
    left:8px;right:8px;bottom:calc(8px + env(safe-area-inset-bottom));
    width:auto;max-height:min(72dvh,540px);border-radius:20px;
  }
  .chat-log{min-height:70px}
  .watchbody .summary{max-height:32dvh;width:min(100%,360px);padding:8px 10px}
  .lobby-me{gap:10px}
  .lobby-me .btn3d{width:100%}
  .lobby-join .btn3d{flex:1 1 auto}
  #s-watch .gbar{padding:6px 62px 0 8px;gap:6px}
  #s-watch .gbar .spacer{display:none}
  .hostbar{gap:5px;padding:0 8px 3px}
  .hostbar .btn3d.small{min-height:44px;font-size:.72rem;padding:6px 9px calc(6px + var(--d))}
  .roomcard{padding:9px 11px;gap:9px;min-height:70px}
  .roomcard .rc-code{min-width:58px;height:42px;font-size:1rem}
}

/* 矮橫向（手機橫拿）：最擠的情況。
 * 設定彈窗要保證「標題與完成鈕不用捲就看得到」，所以面板吃滿高度、內距壓到最小。 */
@media (orientation:landscape) and (max-height:520px){
  .settings-modal{padding:6px}
  .settings-panel{max-height:96dvh;width:min(96vw,520px)}
  .settings-head{padding:6px 9px}
  .settings-badge{width:32px;height:32px}
  .settings-head h2{font-size:1.06rem}
  .settings-close{width:40px;height:40px}
  .room-info-modal{padding:6px}
  .room-info-panel{max-height:96dvh;width:min(96vw,620px)}
  .room-info-head{padding:6px 9px}
  .room-info-badge{width:32px;height:32px}
  .room-info-head h2{font-size:1.06rem}
  .room-info-close{width:40px;height:40px}
  .room-info-body{padding:6px 7px 9px}
  .room-info-note{margin-bottom:8px;padding:6px 8px;font-size:.7rem}
  .settings-body{padding:6px 7px 8px}
  .settings-group{padding:5px 7px 3px;margin-bottom:8px}
  .settings-group h3{margin-bottom:4px;font-size:.92rem}
  .setting-toggle,.setting-range,.setting-text,.setting-static{min-height:46px;padding:5px 4px}
  .settings-foot{padding:6px 9px calc(6px + env(safe-area-inset-bottom))}
  .settings-foot .btn3d{min-height:44px;font-size:.82rem;--d:5px}

  .chat-panel{max-height:88dvh;width:min(320px,60vw)}
  .chat-log{min-height:56px}
  #s-watch .gbar{padding:0;gap:6px}
  #s-watch .gtop{display:flex;align-items:center;gap:8px;padding:4px 122px 0 8px}
  #s-watch .statbar{flex:1;min-width:0;justify-content:flex-end;padding:0;gap:6px;flex-wrap:nowrap;overflow:hidden}
  #w-diff,#w-code{display:none}
  .watchbody{padding:2px 7px 0;gap:8px}
  .watchbody .summary{width:clamp(190px,30vw,260px);padding:7px 9px}
  .sum-row{font-size:.76rem;padding:4px 2px}
  .sum-note{font-size:.68rem;padding:5px 7px}
  .hostbar{padding:0 8px 2px;gap:4px}
  .hostbar .btn3d.small{min-height:42px;font-size:.7rem}
}

/* 更窄的手機：房號、種子這類次要資訊先讓位 */
@media (max-width:400px){
  #w-code{display:none}
  .roomcard .rc-go{display:none}
}

/* 極矮視窗：觀戰畫面允許捲動，不要硬擠 */
@media (max-height:420px) and (orientation:portrait){
  #s-watch.active{overflow-y:auto}
  .watchbody .summary{max-height:none}
}

/* ================================================================
 * 手機軟體鍵盤修正（js/keyboard.js 量測後寫入 --app-h／--kb）
 * 鍵盤彈出時把滿版高度改成「真正看得到的高度」，聊天室輸入框才不會
 * 被鍵盤蓋住；沒有鍵盤時兩個變數都不生效，版面與原本完全一樣。
 * ================================================================ */
#app{height:var(--app-h,100%);min-height:var(--app-h,100dvh)}

/* 版面用 user-select:none 防拖曳，但可輸入的欄位一定要能選字 */
input,textarea,select{user-select:text;-webkit-user-select:text}

/* iOS 對 font-size < 16px 的欄位聚焦時會自動放大整頁，放大後輸入框常被推出畫面 */
@media (pointer:coarse){
  .chatbar .field,.chat-form input,.chatform input,
  #chat-input,#chatInput,#room-chatinput,#game-chatinput{font-size:16px}
}

/* 留言板與它的浮動按鈕是 position:fixed，iOS 的 fixed 不會跟著鍵盤讓開，要自己往上推 */
body.kb-open .chat-panel{
  bottom:calc(12px + env(safe-area-inset-bottom) + var(--kb,0px));
  max-height:calc(var(--app-h,100dvh) - 24px);
}
body.kb-open .chat-fab{bottom:calc(12px + env(safe-area-inset-bottom) + var(--kb,0px))}