:root{--bg:#061518;--panel:rgba(7,24,30,.82);--panel2:rgba(10,34,40,.76);--line:rgba(137,234,224,.23);--text:#e7fffb;--muted:#91b9b7;--cyan:#61f5e4;--cyan2:#25cfc9;--amber:#ffc86d;--coral:#ff7780;--zoom:1}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:'Noto Sans SC',sans-serif;min-height:100vh;overflow-x:hidden}.bg{position:fixed;inset:0;background:linear-gradient(115deg,rgba(3,16,20,.72),rgba(3,16,20,.34)),url('assets/background-02.png') center/cover;z-index:-3;filter:saturate(1.15)}.grain{position:fixed;inset:0;z-index:-2;opacity:.15;pointer-events:none;background-image:radial-gradient(rgba(255,255,255,.35) .5px,transparent .7px);background-size:5px 5px;mix-blend-mode:screen}.shell{width:min(1420px,calc(100% - 48px));margin:auto;padding:28px 0 18px}.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px}.brand{display:flex;gap:13px;align-items:center}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--cyan);border-radius:11px;color:var(--cyan);font-size:22px;box-shadow:0 0 22px rgba(97,245,228,.3)}.brand strong{font-size:22px;letter-spacing:.08em}.brand small{display:block;color:var(--muted);font:11px 'Chakra Petch';letter-spacing:.2em;margin-top:2px}.toolbar{display:flex;gap:9px;flex-wrap:wrap;justify-content:flex-end}.toolbar button{background:rgba(13,39,45,.7);border:1px solid var(--line);border-radius:12px;color:var(--text);padding:11px 15px;font:500 15px 'Noto Sans SC';cursor:pointer;transition:.2s}.toolbar button:hover,.toolbar button:focus{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}.layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:22px}.panel{background:linear-gradient(145deg,rgba(7,28,35,.88),rgba(4,18,25,.8));border:1px solid var(--line);border-radius:24px;box-shadow:0 24px 70px rgba(0,0,0,.32),inset 0 1px rgba(255,255,255,.05);backdrop-filter:blur(16px)}.game-card{padding:28px}.game-head{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:22px}.eyebrow{margin:0 0 8px;color:var(--cyan);font:600 12px 'Chakra Petch';letter-spacing:.16em}.game-head h1{margin:0;font-size:27px;letter-spacing:.03em}.sub{margin:7px 0 0;color:var(--muted);font-size:14px}.status{color:var(--cyan);font:500 14px 'Chakra Petch';display:flex;align-items:center;gap:8px}.pulse{width:8px;height:8px;border-radius:50%;background:var(--cyan);box-shadow:0 0 14px var(--cyan)}.stats{display:flex;gap:10px;margin-bottom:20px}.stats div{background:rgba(3,16,21,.55);border:1px solid rgba(137,234,224,.14);border-radius:14px;padding:11px 16px;min-width:118px}.stats span{display:block;color:var(--muted);font-size:12px}.stats b{font:700 24px 'Chakra Petch';color:var(--cyan)}.board-wrap{padding:14px;border-radius:19px;background:rgba(2,14,18,.75);border:1px solid rgba(97,245,228,.25);box-shadow:inset 0 0 30px rgba(0,0,0,.45)}.board{display:grid;grid-template-columns:repeat(16,1fr);gap:3px;transform:scale(var(--zoom));transform-origin:center;transition:transform .25s;aspect-ratio:1}.cell{border:1px solid rgba(126,237,227,.16);background:linear-gradient(145deg,rgba(17,61,67,.96),rgba(7,34,40,.96));border-radius:4px;display:grid;place-items:center;font:700 clamp(12px,2vw,22px) 'Chakra Petch';color:var(--cyan);cursor:pointer;user-select:none;transition:.1s;box-shadow:inset 0 1px rgba(255,255,255,.04)}.cell:hover{background:#1b6266;box-shadow:0 0 12px rgba(97,245,228,.35)}.cell.open{background:rgba(4,20,25,.7);border-color:rgba(126,237,227,.09);cursor:default}.cell.flag{color:var(--coral);text-shadow:0 0 10px rgba(255,119,128,.7)}.cell.mine{background:rgba(111,31,51,.7);color:var(--coral)}.n1{color:#72f1dc}.n2{color:#8dd8ff}.n3{color:var(--amber)}.n4,.n5{color:#ff9f9f}.hint{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:13px;margin-top:17px}.hint-icon{display:grid;place-items:center;border:1px solid var(--cyan);color:var(--cyan);border-radius:50%;width:19px;height:19px;font:12px 'Chakra Petch'}.key{margin-left:auto;color:#d7f8f3;border:1px solid var(--line);padding:5px 9px;border-radius:7px;font:12px 'Chakra Petch'}.side{display:flex;flex-direction:column;gap:18px}.side .panel{padding:23px}.side h2,.side h3{margin:0 0 20px;font-size:20px}.meter{height:8px;background:#17343b;border-radius:99px;overflow:hidden}.meter span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan2),var(--cyan));border-radius:99px;transition:.3s}.meter-label{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;margin:10px 0 18px}.primary{width:100%;padding:13px 16px;border:0;border-radius:12px;background:var(--cyan);color:#062126;font-weight:900;cursor:pointer;font-size:15px;box-shadow:0 0 22px rgba(97,245,228,.25)}.primary span{float:right;font-size:20px}.legend-row{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:13px;padding:10px 0;border-top:1px solid rgba(137,234,224,.12)}.legend-row b{margin-left:auto;color:var(--text);font:12px 'Chakra Petch'}.dot{width:9px;height:9px;border-radius:50%;display:block}.cyan{background:var(--cyan);box-shadow:0 0 10px var(--cyan)}.amber{background:var(--amber);box-shadow:0 0 10px var(--amber)}.coral{background:var(--coral);box-shadow:0 0 10px var(--coral)}.tip p{color:var(--muted);font-size:13px;line-height:1.8;margin:0}footer{display:flex;justify-content:space-between;color:rgba(190,230,225,.55);font:11px 'Chakra Petch';letter-spacing:.12em;padding:18px 5px}.light{--bg:#d8efeb;--panel:rgba(235,255,251,.8);--panel2:#fff;--line:rgba(22,113,110,.25);--text:#073b3a;--muted:#4e7773}.light .bg{filter:saturate(.8) brightness(1.35);}.light .toolbar button,.light .stats div{background:rgba(255,255,255,.55)}
@media(max-width:900px){.shell{width:min(100% - 24px,680px);padding-top:16px}.topbar{align-items:flex-start;gap:16px;flex-direction:column}.toolbar{justify-content:flex-start}.layout{grid-template-columns:1fr}.side{display:grid;grid-template-columns:1fr 1fr}.tip{grid-column:span 2}.game-card{padding:17px}.game-head h1{font-size:22px}.stats div{min-width:0;flex:1;padding:9px}.hint{align-items:flex-start}.hint .key{display:none}}@media(max-width:480px){.toolbar button{padding:9px 10px;font-size:13px}.toolbar button span{display:none}.game-head{display:block}.status{margin-top:15px}.side{display:flex}.tip{grid-column:auto}.board-wrap{padding:7px}.board{gap:2px}.cell{border-radius:2px}.stats b{font-size:20px}}
/* 首屏工作台：桌面端一屏内完整呈现 */
@media(min-width:901px){body{overflow:hidden}.shell{height:100vh;padding:18px 0 8px;display:flex;flex-direction:column}.topbar{margin-bottom:14px}.layout{gap:18px;min-height:0;flex:1}.game-card{padding:20px;min-height:0;overflow:hidden}.game-head{margin-bottom:12px}.stats{margin-bottom:12px}.stats div{padding:8px 14px;min-width:110px}.board-wrap{padding:10px;min-height:0;display:flex;align-items:center;justify-content:center;flex:1}.board{width:min(100%,calc(100vh - 310px));max-height:100%}.hint{margin-top:10px}footer{padding:8px 5px}}
@media(max-width:900px){body{overflow:auto}.shell{height:auto;min-height:100vh}.board-wrap{display:block}.board{width:100%;max-height:none}}

/* 固定网格轨道，点击后数字不会撑大行高 */
.board{grid-auto-rows:1fr;min-height:0}
.cell{min-width:0;min-height:0;line-height:1;transition:background .1s,box-shadow .1s,color .1s}
.cell.mine{display:grid;place-items:center;align-content:center;justify-content:center;font-size:clamp(10px,1.15vw,18px);line-height:1;overflow:hidden;padding:0;text-align:center}
.level-head{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:12px;margin:14px 0 7px}.level-head b{color:var(--cyan);font:600 13px 'Chakra Petch'}.levels{display:grid;grid-template-columns:repeat(6,1fr);gap:5px;margin-bottom:13px}.level-btn{padding:5px 0;border:1px solid var(--line);border-radius:7px;background:rgba(4,22,27,.45);color:var(--muted);font:12px 'Chakra Petch';cursor:pointer}.level-btn.active,.level-btn:hover{background:var(--cyan);border-color:var(--cyan);color:#05232b}
.light{--bg:#a9dfe6;--panel:rgba(239,255,255,.92);--panel2:#fff;--line:rgba(0,105,124,.36);--text:#063b4a;--muted:#39717a;--cyan:#007c95;--cyan2:#00a9bc;--amber:#ba7000;--coral:#d33d59}.light .bg{filter:saturate(.72) brightness(1.8)}.light .panel{background:linear-gradient(145deg,rgba(240,255,255,.94),rgba(210,246,249,.88));box-shadow:0 18px 45px rgba(0,75,90,.18),inset 0 1px rgba(255,255,255,.8)}.light .toolbar button,.light .stats div{background:rgba(245,255,255,.84)}.light .board-wrap{background:rgba(190,232,237,.86);border-color:rgba(0,105,124,.34)}.light .cell{background:linear-gradient(145deg,#d9f5f5,#b4e0e7);border-color:rgba(0,105,124,.26);color:#006d87}.light .cell.open{background:rgba(235,255,255,.95)}.light .primary{background:#007c95;color:#fff}.light .level-btn{background:rgba(255,255,255,.65)}.light .level-btn.active,.light .level-btn:hover{background:var(--cyan);color:#fff}

/* 修复桌面端棋盘溢出：用高度作为首屏尺寸上限，确保 16×16 完整可见 */
@media(min-width:901px){
  .game-card{display:flex;flex-direction:column}
  .board-wrap{flex:1 1 auto;overflow:hidden}
  .board{width:auto;height:min(100%,calc(100vh - 430px));max-width:100%;aspect-ratio:1 / 1}
}