:root{--bg: #0f1419;--panel: #1a2028;--panel-2: #232b35;--border: #2f3945;--text: #e6e9ee;--muted: #9aa5b1;--primary: #6aa6ff;--primary-2: #4f8de6;--accent: #ffca5a;--success: #4ade80;--danger: #f87171;--shadow: 0 6px 24px rgba(0, 0, 0, .25)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:15px;line-height:1.6}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;cursor:pointer;border:none;border-radius:8px;padding:8px 16px;background:var(--primary);color:#0b1622;font-weight:600;transition:transform .1s,opacity .15s}button:hover:not(:disabled){transform:translateY(-1px)}button:disabled{opacity:.5;cursor:not-allowed}button.ghost{background:transparent;color:var(--text);border:1px solid var(--border)}button.danger{background:var(--danger);color:#1a0606}button.sm{padding:4px 10px;font-size:13px}input,textarea{font-family:inherit;font-size:14px;background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:10px 12px;width:100%}input:focus,textarea:focus{outline:none;border-color:var(--primary)}.app-shell{display:grid;grid-template-columns:220px 1fr;min-height:100vh}.sidebar{background:var(--panel);border-right:1px solid var(--border);padding:20px 14px;display:flex;flex-direction:column;gap:6px;position:sticky;top:0;height:100vh}.brand{font-size:18px;font-weight:700;padding:8px 10px 18px;color:var(--text)}.brand .sub{display:block;font-size:11px;color:var(--muted);font-weight:400;margin-top:2px}.nav-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;color:var(--muted);font-weight:500;cursor:pointer}.nav-item:hover{background:var(--panel-2);color:var(--text);text-decoration:none}.nav-item.active{background:var(--panel-2);color:var(--primary)}.sidebar-footer{margin-top:auto;padding:12px 16px;border-top:1px solid var(--border)}.main{padding:28px 36px 60px;max-width:1100px;width:100%}.page-title{font-size:22px;font-weight:700;margin:0 0 4px}.page-sub{color:var(--muted);margin:0 0 24px;font-size:14px}.card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:20px;box-shadow:var(--shadow)}.grid{display:grid;gap:16px}.grid.cols-2{grid-template-columns:repeat(2,1fr)}.grid.cols-3{grid-template-columns:repeat(3,1fr)}@media (max-width: 760px){.app-shell{grid-template-columns:1fr}.sidebar{position:fixed;bottom:0;left:0;right:0;top:auto;height:60px;flex-direction:row;align-items:stretch;padding:4px 6px calc(4px + env(safe-area-inset-bottom));gap:2px;border-right:none;border-top:1px solid var(--border);z-index:50;background:var(--panel)}.brand,.sidebar-footer{display:none}.nav-item{flex:1;flex-direction:column;justify-content:center;gap:2px;padding:4px 2px;font-size:11px;text-align:center;border-radius:10px}.nav-item span{width:auto!important;font-size:18px}.main{padding:16px 14px calc(84px + env(safe-area-inset-bottom))}.grid.cols-2,.grid.cols-3{grid-template-columns:1fr}.row{flex-wrap:wrap}.row.between{justify-content:space-between}input,textarea{font-size:16px}button{padding:10px 18px}button.sm{padding:6px 12px}.option-btn{padding:14px 16px}.chat{max-height:52vh}.msg{max-width:88%}.toast{bottom:calc(76px + env(safe-area-inset-bottom));left:16px;right:16px;max-width:none}}.play-tag{display:inline-block;font-size:15px;font-weight:700;color:#1a1300;background:linear-gradient(135deg,#ffd96a,#ffb443);padding:4px 14px;border-radius:999px;box-shadow:0 3px 10px #ffb44373;animation:playWiggle 1.6s ease-in-out infinite;transform-origin:center}@keyframes playWiggle{0%,to{transform:rotate(-3deg) scale(1)}50%{transform:rotate(3deg) scale(1.08)}}.m3-board{position:relative;width:100%;max-width:460px;margin:0 auto;container-type:inline-size;background:radial-gradient(circle at 30% 20%,rgba(96,140,200,.07),transparent 60%),radial-gradient(circle at 75% 80%,rgba(220,170,110,.06),transparent 55%),var(--panel-2);border:1px solid var(--border);border-radius:16px;overflow:hidden;user-select:none;-webkit-user-select:none;touch-action:manipulation}.m3-tile{position:absolute;display:flex;align-items:center;justify-content:center;text-align:center;padding:2px 5px;font-weight:600;line-height:1.1;border-radius:10px;border:1px solid rgba(255,255,255,.12);cursor:pointer;white-space:nowrap;overflow:hidden;transition:transform .12s ease,box-shadow .12s ease,filter .12s ease}.m3-tile:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(180deg,#ffffff38,#fff0 50%);pointer-events:none;border-radius:inherit}.m3-tile.blocked{cursor:not-allowed;background:var(--panel-2)!important;border-color:var(--border)!important;color:var(--muted)!important;opacity:.5;filter:grayscale(.7) brightness(.72);box-shadow:none!important}.m3-tile.blocked:before{display:none}.m3-tile:not(.blocked):active{transform:scale(.92)}.m3-tile.pm-en{background:linear-gradient(155deg,#4a74a8,#3c6399,#33739e);border-color:#a0c4eb59;color:#f4f9ff;box-shadow:0 3px 7px #1e3c6966,inset 0 1px #ffffff38;font-size:14px}.m3-tile.pm-zh{background:linear-gradient(155deg,#b0864f,#9c7040,#a87348);border-color:#eecda059;color:#fff8ee;box-shadow:0 3px 7px #78502861,inset 0 1px #ffffff38;font-size:13px}.m3-tile.selected{outline:2px solid var(--accent);outline-offset:1px;box-shadow:0 0 0 3px #ffca5a47,0 0 14px #ffca5a99,0 5px 12px #00000059!important;transform:translateY(-3px) scale(1.04);z-index:50!important}.m3-tile.wrong{outline:2px solid #e06c70;box-shadow:0 0 12px #e06c7099!important;animation:m3shake .35s ease}@keyframes m3shake{0%,to{transform:translate(0)}20%{transform:translate(-4px)}40%{transform:translate(4px)}60%{transform:translate(-3px)}80%{transform:translate(3px)}}.m3-tile.matched{outline:2px solid #3ddc97;outline-offset:1px;box-shadow:0 0 16px #3ddc97bf!important;z-index:60!important;animation:matchPop .5s ease forwards}@keyframes matchPop{0%{transform:scale(1) rotate(0)}40%{transform:scale(1.18) rotate(4deg)}to{transform:scale(0) rotate(-8deg);opacity:0}}.fb-pop{position:absolute;left:50%;top:42%;transform:translate(-50%,-50%);z-index:120;font-size:clamp(18px,4.6vw,26px);font-weight:800;padding:10px 22px;border-radius:14px;pointer-events:none;white-space:nowrap;animation:fbZoom 1.1s ease forwards}.fb-good{background:linear-gradient(135deg,#3ddc97,#22b87a);color:#062b1c;box-shadow:0 8px 24px #3ddc9780}.fb-bad{background:linear-gradient(135deg,#ff8a8a,#ff6b6b);color:#fff;box-shadow:0 8px 24px #ff6b6b80}@keyframes fbZoom{0%{transform:translate(-50%,-50%) scale(.3);opacity:0}20%{transform:translate(-50%,-50%) scale(1.12);opacity:1}35%{transform:translate(-50%,-50%) scale(1)}80%{transform:translate(-50%,-55%) scale(1);opacity:1}to{transform:translate(-50%,-85%) scale(.95);opacity:0}}.confetti{position:absolute;width:8px;height:12px;border-radius:2px;z-index:110;pointer-events:none;animation:confFly .9s ease-out forwards}@keyframes confFly{0%{transform:translate(0) rotate(0);opacity:1}to{transform:translate(var(--tx),var(--ty)) rotate(540deg);opacity:0}}.heart-drop{position:absolute;top:0;font-size:18px;pointer-events:none;animation:heartFall .5s ease forwards}@keyframes heartFall{0%{transform:translateY(0) scale(1);opacity:1}to{transform:translateY(26px) scale(.5) rotate(30deg);opacity:0}}.m3-slotbar{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;max-width:460px;margin:14px auto 0}.m3-slot{aspect-ratio:1;border:2px dashed var(--border);border-radius:8px;display:flex;align-items:center;justify-content:center;text-align:center;font-size:clamp(8px,2.2vw,12px);font-weight:600;padding:2px;word-break:break-all;color:var(--muted)}.m3-slot.filled{border-style:solid;background:var(--panel);color:var(--text);box-shadow:0 2px 5px #0003}.m3-flash{position:absolute;left:50%;top:40%;transform:translate(-50%,-50%);background:var(--accent);color:#1a1300;padding:14px 22px;border-radius:12px;text-align:center;z-index:100;box-shadow:0 6px 20px #0000004d;animation:m3pop .3s ease;max-width:80%}.m3-end{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;background:#0000008c;z-index:90;color:#fff;border-radius:14px}@keyframes m3pop{0%{transform:translate(-50%,-50%) scale(.6);opacity:0}to{transform:translate(-50%,-50%) scale(1);opacity:1}}.stat{display:flex;flex-direction:column;gap:4px}.stat .label{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.stat .value{font-size:24px;font-weight:700}.stat .value .small{font-size:14px;color:var(--muted);font-weight:400;margin-left:4px}.progress{height:8px;background:var(--panel-2);border-radius:4px;overflow:hidden}.progress>div{height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));transition:width .4s}.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:12px;font-weight:600;background:var(--panel-2);color:var(--text);border:1px solid var(--border)}.badge.accent{background:#ffca5a26;color:var(--accent);border-color:#ffca5a4d}.badge.success{background:#4ade8026;color:var(--success);border-color:#4ade804d}.chat{display:flex;flex-direction:column;gap:12px;max-height:480px;overflow-y:auto;padding:10px 2px}.msg{max-width:80%;padding:10px 14px;border-radius:12px;line-height:1.5;white-space:pre-wrap;word-break:break-word}.msg.assistant{align-self:flex-start;background:var(--panel-2);border-bottom-left-radius:4px}.msg.user{align-self:flex-end;background:var(--primary);color:#0b1622;border-bottom-right-radius:4px}.msg-meta{font-size:12px;color:var(--muted);margin-top:6px}.correction-box{margin-top:8px;padding:8px 10px;background:#6aa6ff14;border-left:3px solid var(--primary);border-radius:4px;font-size:13px}.score-pill{display:inline-block;padding:1px 8px;border-radius:999px;font-size:12px;font-weight:700;margin-left:8px}.option-btn{display:block;width:100%;text-align:left;background:var(--panel-2);color:var(--text);border:1px solid var(--border);padding:12px 14px;margin-bottom:8px}.option-btn:hover:not(:disabled){border-color:var(--primary);transform:none}.option-btn.correct{background:#4ade802e;border-color:var(--success);color:var(--success)}.option-btn.wrong{background:#f871712e;border-color:var(--danger);color:var(--danger)}.option-btn.selected{border-color:var(--primary);background:#6aa6ff26}.toast{position:fixed;bottom:24px;right:24px;background:var(--panel-2);border:1px solid var(--border);padding:12px 16px;border-radius:10px;box-shadow:var(--shadow);z-index:100;max-width:320px;animation:slidein .25s ease}.toast.success{border-color:var(--success)}.toast.error{border-color:var(--danger)}@keyframes slidein{0%{transform:translateY(10px);opacity:0}to{transform:translateY(0);opacity:1}}.login-wrap{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px}.login-card{width:100%;max-width:380px}.muted{color:var(--muted)}.row{display:flex;align-items:center;gap:10px}.row.between{justify-content:space-between}.flex-1{flex:1}.mt-12{margin-top:12px}.mt-20{margin-top:20px}.center{text-align:center}.empty{text-align:center;padding:40px 20px;color:var(--muted)}