:root{--bg: #0b1020;--card: rgba(255, 255, 255, .055);--card-strong: rgba(255, 255, 255, .09);--border: rgba(255, 255, 255, .1);--text: #e8ecf7;--muted: #98a2bd;--accent: #6c8cff;--ok: #4ade80;--warn: #fbbf24;--bad: #ff6b7a;--radius: 18px;--shadow: 0 18px 50px rgba(0, 0, 0, .35);--font: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html,body{min-height:100%}body{font-family:var(--font);color:var(--text);background:radial-gradient(1100px 700px at 15% -10%,rgba(76,97,196,.35) 0%,transparent 55%),radial-gradient(900px 600px at 110% 8%,rgba(120,60,160,.28) 0%,transparent 50%),radial-gradient(800px 600px at 50% 115%,rgba(20,120,130,.2) 0%,transparent 55%),var(--bg);background-attachment:fixed;overscroll-behavior-y:none}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}#root{min-height:100vh}.app{max-width:820px;margin:0 auto;padding:0 16px 60px;min-height:100vh}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;padding:14px 4px;background:linear-gradient(to bottom,var(--bg) 62%,transparent);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}.icon-btn{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:var(--card);border:1px solid var(--border);transition:background .2s,transform .15s}.icon-btn:active{transform:scale(.92)}.topbar-title{display:flex;align-items:center;gap:10px;font-weight:700;font-size:16px;flex:1;min-width:0}.level-chip{flex-shrink:0;font-size:12px;font-weight:800;padding:3px 9px;border-radius:999px;color:#0b1020;background:var(--c)}.topbar-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topbar-count{margin-left:auto;font-size:12px;font-weight:600;color:var(--muted);flex-shrink:0}.topbar-spacer{width:38px}.hero{text-align:center;padding:48px 16px 30px;animation:fade-up .45s ease both}.hero-badge{display:inline-block;font-size:12px;font-weight:800;letter-spacing:3px;color:var(--accent);border:1px solid rgba(108,140,255,.5);border-radius:999px;padding:6px 16px;margin-bottom:18px}.hero h1{font-size:clamp(1.7rem,5.5vw,2.5rem);font-weight:900;letter-spacing:1px;background:linear-gradient(120deg,#fff 30%,#9db4ff 70%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.hero p{margin-top:12px;color:var(--muted);font-size:14px;line-height:1.7;max-width:480px;margin-left:auto;margin-right:auto}.level-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;animation:fade-up .5s .08s ease both}.level-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;display:flex;flex-direction:column;gap:12px;position:relative;overflow:hidden;transition:transform .2s,border-color .2s,background .2s}.level-card:before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:linear-gradient(90deg,var(--c),transparent 80%)}.level-card:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--c) 45%,transparent);background:var(--card-strong)}.level-card-head{display:flex;align-items:center;justify-content:space-between;gap:8px}.level-badge{font-size:13px;font-weight:800;color:#0b1020;padding:3px 10px;border-radius:999px}.level-target{font-size:12px;font-weight:600;color:var(--muted)}.level-card h2{font-size:18px;font-weight:800}.level-desc{font-size:12.5px;color:var(--muted);line-height:1.65;flex:1}.progress-row{display:flex;align-items:center;gap:10px}.progress-bar{flex:1;height:8px;border-radius:999px;background:#ffffff14;overflow:hidden}.progress-bar.thin{height:5px}.progress-fill{height:100%;border-radius:999px;transition:width .4s ease}.progress-num{font-size:12px;font-weight:700;color:var(--muted);white-space:nowrap}.mode-btns{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.mode-btn{padding:10px 0;border-radius:12px;font-size:14px;font-weight:700;color:var(--c);background:color-mix(in srgb,var(--c) 12%,transparent);border:1px solid color-mix(in srgb,var(--c) 35%,transparent);transition:background .2s,transform .15s}.mode-btn:active{transform:scale(.95)}.home-foot{text-align:center;color:var(--muted);font-size:12px;padding:34px 10px 10px}.view{display:flex;flex-direction:column;gap:16px;animation:fade-up .35s ease both}.view-center{justify-content:center;align-items:center;min-height:62vh}.view-head{display:flex;align-items:center;gap:12px}.view-count{font-size:13px;font-weight:700;color:var(--muted);white-space:nowrap}.flip-scene{perspective:1400px;cursor:pointer;user-select:none;-webkit-user-select:none}.flip-inner{position:relative;width:100%;min-height:clamp(380px,52vh,470px);transform-style:preserve-3d;transition:transform .6s cubic-bezier(.3,.7,.3,1)}.flip-scene.flipped .flip-inner{transform:rotateY(180deg)}.flip-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:22px;border:1px solid var(--border);background:var(--card);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:28px;overflow:hidden}.flip-front{background:radial-gradient(600px 320px at 50% -10%,color-mix(in srgb,var(--accent) 20%,transparent),transparent 65%),var(--card)}.flip-back{transform:rotateY(180deg);background:radial-gradient(600px 320px at 50% -10%,color-mix(in srgb,#38d9c8 18%,transparent),transparent 65%),var(--card)}.front-top{position:absolute;top:16px;right:16px;display:flex;gap:8px}.speak-btn{display:inline-flex;align-items:center;gap:6px;padding:7px 13px;border-radius:999px;font-size:12.5px;font-weight:700;background:var(--card-strong);border:1px solid var(--border);transition:background .2s,transform .15s}.speak-btn:active{transform:scale(.94)}.speak-btn svg{color:var(--accent)}.word{font-size:clamp(2.3rem,9vw,3.6rem);font-weight:800;letter-spacing:1px;word-break:break-word;text-align:center;line-height:1.15}.ipa-row{display:flex;gap:14px;margin-top:10px;color:var(--muted);font-size:14px;font-weight:600}.ipa-row span{background:#ffffff0f;padding:4px 12px;border-radius:999px}.root-box{margin-top:26px;width:100%;max-width:520px;text-align:center}.root-label{font-size:11.5px;font-weight:700;color:var(--muted);letter-spacing:2px;margin-bottom:10px}.root-parts{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}.root-part{font-size:14px;font-weight:600;padding:7px 14px;border-radius:10px;background:color-mix(in srgb,var(--accent) 14%,transparent);border:1px solid color-mix(in srgb,var(--accent) 30%,transparent);color:#cdd8ff}.back-word{font-size:20px;font-weight:800;margin-bottom:14px;color:var(--muted)}.back-def{font-size:clamp(1.15rem,4.5vw,1.5rem);font-weight:800;text-align:center;line-height:1.6;max-width:520px}.back-ex{margin-top:20px;font-size:15px;font-style:italic;color:var(--text);text-align:center;line-height:1.7;max-width:520px}.back-ex-cn{margin-top:8px;font-size:13.5px;color:var(--muted);text-align:center;max-width:520px}.flip-back .speak-btn{margin-top:24px}.flip-hint{position:absolute;bottom:16px;font-size:11.5px;color:var(--muted);letter-spacing:1px;opacity:.85}.view-controls{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:center}.nav-btn{padding:12px 18px;border-radius:13px;font-size:14px;font-weight:700;background:var(--card);border:1px solid var(--border);transition:background .2s,transform .15s;white-space:nowrap}.nav-btn:active{transform:scale(.95)}.master-btn{padding:12px 20px;border-radius:13px;font-size:14px;font-weight:800;color:#0b1020;background:linear-gradient(135deg,#22d3ee,#38bdf8);transition:transform .15s,filter .2s}.master-btn.active{background:linear-gradient(135deg,#4ade80,#22c55e)}.master-btn:active{transform:scale(.95)}.auto-label{display:flex;align-items:center;justify-content:center;gap:8px;font-size:13px;color:var(--muted)}.auto-label input{accent-color:var(--accent);width:15px;height:15px}.dots{display:grid;grid-template-columns:repeat(auto-fill,minmax(12px,1fr));gap:5px;max-height:88px;overflow-y:auto;padding:4px 2px}.dot{height:8px;border-radius:999px;background:#ffffff24;cursor:pointer;transition:background .15s,transform .15s}.dot.cur{background:var(--accent);transform:scaleY(1.5)}.dot.done{background:var(--ok);opacity:.75}.dot:hover{background:#ffffff4d}.rate-btns{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.rate-btn{padding:13px 0;border-radius:13px;font-size:14.5px;font-weight:800;border:1px solid var(--border);transition:transform .15s,filter .2s}.rate-btn:active{transform:scale(.94)}.rate-btn.ok{color:var(--ok);background:#4ade801a;border-color:#4ade8059}.rate-btn.mid{color:var(--warn);background:#fbbf241a;border-color:#fbbf2459}.rate-btn.bad{color:var(--bad);background:#ff6b7a1a;border-color:#ff6b7a59}.rate-result{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:6px 4px;font-size:14.5px;font-weight:700}.setup-box{width:min(92vw,460px);background:var(--card);border:1px solid var(--border);border-radius:22px;padding:30px 26px;display:flex;flex-direction:column;gap:22px;box-shadow:var(--shadow)}.setup-box h2,.result-box h2{font-size:20px;font-weight:800;text-align:center}.field{display:flex;flex-direction:column;gap:10px}.field-label{font-size:13px;font-weight:700;color:var(--muted)}.seg{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.seg-btn{padding:11px 0;border-radius:11px;font-size:14px;font-weight:700;color:var(--muted);background:var(--card);border:1px solid var(--border);transition:all .2s}.seg-btn.on{color:#0b1020;background:var(--accent);border-color:var(--accent);font-weight:800}.start-btn{padding:14px 0;border-radius:13px;font-size:15.5px;font-weight:800;color:#0b1020;background:linear-gradient(135deg,var(--c),color-mix(in srgb,var(--c) 55%,#fff));transition:transform .15s,filter .2s}.start-btn:active{transform:scale(.96)}.quiz-card{background:var(--card);border:1px solid var(--border);border-radius:22px;padding:30px 22px;display:flex;flex-direction:column;align-items:center;gap:18px;box-shadow:var(--shadow)}.quiz-prompt{font-size:clamp(1.5rem,6vw,2.1rem);font-weight:800;text-align:center;word-break:break-word}.quiz-sub{font-size:13px;color:var(--muted);text-align:center}.quiz-options{width:100%;display:grid;gap:10px;margin-top:6px}.opt-btn{width:100%;padding:14px 16px;border-radius:13px;font-size:14.5px;font-weight:600;text-align:left;background:var(--card);border:1px solid var(--border);line-height:1.5;transition:all .2s;word-break:break-word}.opt-btn:active{transform:scale(.98)}.opt-btn.right{background:#4ade8024;border-color:var(--ok);color:var(--ok);font-weight:700}.opt-btn.wrong{background:#ff6b7a24;border-color:var(--bad);color:var(--bad);font-weight:700}.opt-btn.dim{opacity:.4}.quiz-score{text-align:center;font-size:13.5px;color:var(--muted)}.quiz-score b{color:var(--text)}.result-box{width:min(92vw,480px);background:var(--card);border:1px solid var(--border);border-radius:22px;padding:32px 26px;display:flex;flex-direction:column;align-items:center;gap:14px;box-shadow:var(--shadow)}.score-ring{--p: 0deg;width:118px;height:118px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--c) var(--p),rgba(255,255,255,.1) 0);position:relative}.score-ring:before{content:"";position:absolute;top:10px;right:10px;bottom:10px;left:10px;border-radius:50%;background:var(--bg)}.score-ring span{position:relative;font-size:30px;font-weight:800}.score-ring small{font-size:15px;color:var(--muted);font-weight:700}.score-tip{font-size:14px;color:var(--muted)}.wrong-list{width:100%;max-height:220px;overflow-y:auto;display:flex;flex-direction:column;gap:8px;margin-top:6px}.wrong-title{font-size:13px;font-weight:800;color:var(--bad);margin-bottom:2px}.wrong-item{display:flex;justify-content:space-between;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:9px 12px;font-size:13.5px}.wrong-word{font-weight:800;flex-shrink:0}.wrong-def{color:var(--muted);text-align:right}.row-btns{display:flex;gap:10px;margin-top:8px}.empty-box{color:var(--muted);font-size:15px;text-align:center}.ok{color:var(--ok)}.bad{color:var(--bad)}@keyframes fade-up{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 820px){.level-grid{grid-template-columns:1fr}}@media (max-width: 480px){.app{padding:0 12px 48px}.flip-inner{min-height:56vh}.flip-face{padding:20px 16px}.ipa-row{flex-wrap:wrap;justify-content:center}.view-controls{grid-template-columns:1fr auto 1fr;gap:8px}.master-btn{padding:12px;font-size:13.5px}.rate-result{flex-direction:column}}@media (prefers-reduced-motion: reduce){*{animation-duration:.01ms!important;transition-duration:.01ms!important}}