:root{color-scheme:light;--ink:#17332f;--muted:#6f7a75;--paper:#f7f5ef;--card:#fff;--line:#dedfd8;--green:#163b36;--green-soft:#e6efeb;--orange:#c55e32;--orange-soft:#f7e7df;--shadow:0 12px 36px rgba(25,44,39,.08);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Noto Sans CJK SC",sans-serif;font-size:16px}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);min-height:100dvh}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}.shell{width:min(100%,480px);min-height:100dvh;margin:auto;padding:calc(28px + env(safe-area-inset-top)) max(18px,env(safe-area-inset-right)) calc(28px + env(safe-area-inset-bottom)) max(18px,env(safe-area-inset-left))}.eyebrow{display:block;color:#8b5a3e;font-size:.72rem;font-weight:800;letter-spacing:.15em}.muted{color:var(--muted)}.card{background:var(--card);border:1px solid rgba(23,51,47,.08);border-radius:20px;box-shadow:var(--shadow)}.button{border:0;border-radius:14px;min-height:56px;padding:13px 18px;font-weight:760;cursor:pointer}.button:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid rgba(197,94,50,.35);outline-offset:3px}.button:disabled,button:disabled{opacity:.45;cursor:not-allowed}.wide{width:100%}.primary{background:var(--green);color:#fff}.secondary{background:var(--card);border:1px solid var(--line);color:var(--ink)}.accent{background:var(--orange);color:#fff}.text-button,.icon-button{border:0;background:transparent;color:var(--ink);min-height:44px;cursor:pointer}.home-header,.topbar{display:flex;align-items:center;justify-content:space-between}.home-header h1{margin:.3rem 0 0;font-size:1.65rem}.home-header .text-button{color:var(--muted)}.intro{margin:40px 0 20px}.intro p{margin:0 0 6px}.intro h2{font-size:1.8rem;margin:0 0 8px}.stats{display:grid;grid-template-columns:repeat(6,1fr);gap:0;padding:18px 8px}.stats>div{grid-column:span 2;text-align:center;padding:8px 4px}.stats>div:nth-child(4),.stats>div:nth-child(5){grid-column:span 3;border-top:1px solid var(--line);margin-top:8px;padding-top:16px}.stats strong{display:block;font-size:1.5rem}.stats small{font-size:.8rem;color:var(--muted)}.stats span{display:block;color:var(--muted);font-size:.76rem;margin-top:4px}.sync{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:.8rem;margin:14px 4px}.sync span{width:7px;height:7px;border-radius:50%;background:#729c83}.sync.offline span,.sync.failed span{background:var(--orange)}.action-grid{display:grid;gap:10px;margin:12px 0}.action-grid .button{text-align:left}.action-grid small{display:block;font-weight:500;opacity:.7;margin-bottom:3px}.link-list{margin-top:24px;border-top:1px solid var(--line)}.link-list button,.link-list a{width:100%;display:flex;align-items:center;justify-content:space-between;min-height:58px;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--ink);text-decoration:none;cursor:pointer}.link-list b{font-weight:600;color:var(--muted)}.topbar{margin-bottom:42px}.topbar h1{font-size:1.1rem}.icon-button,.topbar-space{width:44px}.icon-button{font-size:1.5rem;text-align:left}.page-heading{margin-bottom:28px}.page-heading h2{font-size:2rem;line-height:1.15;margin:8px 0 18px}.choice-list{display:grid;gap:10px}.choice{display:flex;justify-content:space-between;align-items:center;min-height:68px;padding:0 20px;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--ink);cursor:pointer}.choice b{color:var(--muted)}.auth-shell{display:flex;flex-direction:column;justify-content:center}.brand{margin-bottom:32px}.brand h1{font-size:2.25rem;margin:8px 0}.brand p{color:var(--muted)}.login-card{padding:22px}.login-card label{display:block;font-weight:700;margin-bottom:10px}.login-card input{width:100%;height:52px;border:1px solid #bfc5bf;border-radius:12px;padding:0 14px;margin-bottom:14px;background:#fff;font-size:18px}.form-error{color:#a33c27;margin:0 0 12px}.test-shell{width:min(100%,560px);margin:auto;min-height:100dvh;display:flex;flex-direction:column;padding:calc(22px + env(safe-area-inset-top)) 18px calc(20px + env(safe-area-inset-bottom))}.test-progress>span{display:block;text-align:center;color:var(--muted);font-weight:700;font-size:.85rem}.test-progress>div{height:4px;background:#e1e1db;border-radius:9px;margin-top:12px;overflow:hidden}.test-progress i{display:block;height:100%;background:var(--orange)}.word-stage{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:390px;text-align:center;padding:32px 4px}.word-stage h1{font-size:clamp(3rem,14vw,4rem);line-height:1.05;overflow-wrap:anywhere;margin:20px 0 12px}.meaning{min-height:34px;font-size:1.35rem;color:var(--muted);opacity:0}.meaning.visible{opacity:1}.reveal-button{min-height:44px;border:0;border-bottom:1px solid var(--ink);background:transparent;color:var(--ink);margin-top:20px;cursor:pointer}.answer-panel{margin-top:auto}.answer-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px}.wrong{background:var(--orange-soft);color:#8f371f;border:1px solid #e5bca9}.correct{background:var(--green);color:#fff}.test-tools{display:flex;justify-content:space-between;margin-top:14px}.test-tools button{min-height:44px;background:transparent;border:0;color:var(--muted);cursor:pointer}.complete-shell{text-align:center;display:flex;flex-direction:column;justify-content:center}.completion-mark{width:72px;height:72px;margin:0 auto 18px;border-radius:50%;display:grid;place-items:center;background:var(--green-soft);font-size:2rem}.complete-shell h1{font-size:2rem}.result-card{display:grid;grid-template-columns:1fr 1fr;margin:18px 0;padding:8px}.result-card div{padding:16px;border-bottom:1px solid var(--line)}.result-card div:nth-last-child(-n+2){border-bottom:0}.result-card span,.result-card strong{display:block}.result-card span{color:var(--muted);font-size:.8rem}.result-card strong{font-size:1.55rem;margin-top:4px}.complete-shell .button{margin-top:10px}.save-state{color:var(--muted);min-height:24px}.filters{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:18px}.filters>div{display:flex;background:#e8e7e1;border-radius:10px;padding:3px}.filters button{border:0;background:transparent;min-height:38px;padding:0 10px;color:var(--muted);border-radius:8px}.filters button.active{background:#fff;color:var(--ink);box-shadow:0 2px 6px rgba(0,0,0,.06)}.filters select{height:44px;max-width:120px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink)}.word-list,.history-list{display:grid;gap:10px}.word-row,.history-row{background:#fff;border:1px solid var(--line);border-radius:15px;padding:16px}.word-row h3,.history-row h3{font-size:1.35rem;margin:0}.word-row p,.history-row p{color:var(--muted);margin:4px 0}.word-row dl{display:flex;gap:15px;margin:14px 0 0;border-top:1px solid var(--line);padding-top:12px}.word-row dl div{min-width:0}.word-row dt{font-size:.7rem;color:var(--muted)}.word-row dd{font-size:.8rem;margin:3px 0 0}.history-row{width:100%;display:flex;justify-content:space-between;text-align:left;color:var(--ink);cursor:pointer}.history-row time{color:var(--muted);font-size:.78rem}.history-row>div:last-child{text-align:right}.history-row strong,.history-row span{display:block}.history-row strong{font-size:1.5rem}.history-row span{font-size:.72rem;color:var(--muted)}.empty{text-align:center;color:var(--muted);padding:50px 12px}.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translateX(-50%);background:#172b28;color:#fff;border-radius:10px;padding:12px 16px;box-shadow:var(--shadow);z-index:20}.loading-line{text-align:center;color:var(--muted);margin-top:40vh}@media(max-width:360px){.stats strong{font-size:1.25rem}.filters{align-items:stretch;flex-direction:column}.filters select{max-width:none;width:100%}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}