:root{--paper:#f6f4eb;--ink:#1d302b;--muted:#64746c;--line:#dbe3d7;--green:#26765c;--green2:#dcefe4;--gold:#f6d891;--white:#fff;--shadow:0 18px 50px rgba(34,66,52,.09);font-family:'Noto Sans SC','Microsoft YaHei',sans-serif;color:var(--ink)}
*{box-sizing:border-box}body{margin:0;background:var(--paper)}button,input{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,a:focus-visible{outline:3px solid #e4aa47;outline-offset:3px}a{color:inherit}h1,h2,h3,p{margin-top:0}h1,h2{font-family:'Noto Serif SC','Songti SC',serif}h1{font-size:clamp(30px,4vw,54px);line-height:1.16;letter-spacing:-.025em}h2{font-size:clamp(24px,3vw,34px)}p{line-height:1.7}.app-shell{min-height:100vh;display:grid;grid-template-columns:250px minmax(0,1fr)}.sidebar{background:#eaf0e7;border-right:1px solid var(--line);padding:32px 20px;display:flex;flex-direction:column;gap:28px;position:sticky;top:0;height:100vh}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-weight:800;font-size:17px;line-height:1.25}.brand small{display:block;font-weight:500;color:var(--muted);font-size:12px;letter-spacing:.12em;margin-top:4px}.brand-mark{display:grid;place-items:center;width:43px;height:43px;border-radius:15px;background:var(--green);color:#fff;font-family:serif;font-size:23px;transform:rotate(-8deg)}.sidebar nav{display:grid;gap:8px}.nav-link{border:0;background:transparent;color:var(--ink);text-align:left;border-radius:13px;padding:13px 15px;font-weight:700}.nav-link span{font-size:21px;display:inline-block;width:30px;vertical-align:middle}.nav-link.active,.nav-link:hover{background:var(--white);box-shadow:0 4px 16px rgba(21,60,42,.06)}.sidebar-note{margin-top:auto;border-radius:20px;background:#d8e8da;padding:18px}.sidebar-note p{font-size:13px;color:var(--muted);margin:8px 0 0}.original-link{font-size:13px;text-decoration:none;color:var(--green);font-weight:700}.original-link:hover{text-decoration:underline}main{width:100%;max-width:1320px;margin:auto;padding:32px clamp(22px,5vw,72px) 70px;min-width:0}.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:25px;color:var(--muted);font-size:13px}.eyebrow{color:var(--green);font-size:12px;letter-spacing:.18em;font-weight:800;text-transform:uppercase}.pill{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border-radius:99px;background:#fff;border:1px solid var(--line);font-weight:700}.hero{background:linear-gradient(125deg,#dceee0 0%,#edf1db 65%,#f5e6c6 100%);border-radius:29px;min-height:240px;padding:clamp(24px,4vw,52px);display:flex;align-items:center;justify-content:space-between;gap:28px;overflow:hidden}.hero p{max-width:550px;color:#496153;margin:12px 0 20px}.hero-art{width:215px;height:215px;border-radius:50%;background:rgba(255,255,255,.55);display:grid;place-items:center;font-size:86px;flex:none;box-shadow:inset 0 0 0 14px rgba(255,255,255,.28)}.btn{border:0;border-radius:13px;padding:12px 20px;font-weight:800;background:var(--green);color:#fff;box-shadow:0 6px 16px rgba(30,104,78,.16)}.btn:hover{background:#195d47}.btn.secondary{background:#fff;color:var(--ink);border:1px solid var(--line);box-shadow:none}.btn.ghost{background:transparent;color:var(--green);box-shadow:none}.btn:disabled{opacity:.5;cursor:not-allowed}.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin:38px 0 17px}.section-head h2{margin:0}.section-head p{margin:4px 0 0;color:var(--muted);font-size:14px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:18px}.stat{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px}.stat b{font-size:26px;display:block}.stat span{color:var(--muted);font-size:13px}.deck-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}.deck{background:#fff;border:1px solid var(--line);border-radius:23px;padding:15px;display:flex;gap:19px;align-items:center;text-align:left;min-width:0}.deck:hover,.word-tile:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.deck .art{width:122px;min-width:122px;aspect-ratio:1;border-radius:15px}.deck h3{font-size:20px;margin:0 0 4px}.deck p{font-size:13px;color:var(--muted);margin:0 0 10px}.deck .arrow{color:var(--green);font-weight:800;font-size:13px}.art{background-color:#e7e8d9;background-repeat:no-repeat;background-size:400% 400%;background-position:var(--px) var(--py);overflow:hidden}.study-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,.7fr);gap:24px;align-items:start}.study-card,.info-card,.quiz-card{background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);overflow:hidden}.study-card .art,.quiz-card .art{width:100%;aspect-ratio:1.3}.study-body{padding:24px}.study-body h2{font-size:clamp(34px,5vw,58px);margin:6px 0 0}.reading{color:var(--green);font-weight:700;letter-spacing:.06em}.word-variant{color:var(--muted);font-size:13px}.study-meaning{font-size:20px;font-weight:700;margin:14px 0}.masked{background:#e8eee7;border-radius:12px;color:transparent;user-select:none;min-height:36px}.roots{display:flex;flex-wrap:wrap;gap:7px;margin:13px 0}.root{background:var(--green2);color:#21684e;border-radius:99px;padding:5px 10px;font-size:12px;font-weight:700}.card-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:19px}.info-card{padding:24px}.info-card h3{margin:0 0 13px;font-size:17px}.info-card p{color:#4f6257;font-size:14px}.info-card .tip{background:#f7f8ef;border-left:4px solid #e0b35c;padding:12px;border-radius:8px}.progress-track{height:9px;border-radius:99px;background:#e6ebdf;overflow:hidden;margin:15px 0}.progress-fill{height:100%;background:var(--green);border-radius:99px}.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:24px 0}.search{flex:1;min-width:200px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 15px}.select{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px}.word-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:15px}.word-tile{background:#fff;border:1px solid var(--line);border-radius:19px;overflow:hidden;text-align:left;padding:0;transition:.2s}.word-tile .art{aspect-ratio:1.2;width:100%}.tile-copy{padding:13px}.tile-copy strong{font-size:20px;display:block}.tile-copy small{color:var(--green);font-size:12px}.tile-copy p{font-size:12px;color:var(--muted);margin:5px 0 0;line-height:1.5;min-height:36px}.quiz-card{max-width:760px;margin:auto;padding:18px}.quiz-card .art{border-radius:15px}.quiz-body{padding:12px 8px 8px}.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:10px}.option{background:#f8faf6;border:1px solid var(--line);border-radius:13px;padding:14px;text-align:left;min-height:74px}.option:hover:not(:disabled){border-color:var(--green)}.option.correct{border-color:#3e9b6c;background:#def3e3}.option.wrong{border-color:#cf7b71;background:#fce7e2}.quiz-feedback{min-height:35px;font-weight:700;margin:12px 0 0}.backrow{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;gap:12px}.text-button{border:0;background:transparent;color:var(--green);font-weight:700;padding:8px}.empty{padding:45px;border:1px dashed var(--line);border-radius:18px;text-align:center;color:var(--muted)}#toast{position:fixed;right:20px;bottom:20px;background:var(--ink);color:#fff;border-radius:12px;padding:11px 16px;opacity:0;pointer-events:none;transition:.25s;z-index:5}#toast.show{opacity:1}.footer-note{font-size:12px;color:var(--muted);margin-top:36px}.footer-note a{color:var(--green)}
@media(max-width:900px){.app-shell{grid-template-columns:1fr}.sidebar{position:sticky;z-index:3;height:auto;top:0;display:flex;flex-direction:row;align-items:center;padding:10px 16px;gap:12px}.sidebar nav{display:flex;margin-left:auto}.nav-link{font-size:12px;padding:8px}.nav-link span{display:none}.sidebar-note,.original-link{display:none}main{padding:22px 18px 80px}.study-layout{grid-template-columns:1fr}.hero-art{width:140px;height:140px;font-size:64px}}
@media(max-width:600px){.brand{font-size:13px}.brand-mark{width:34px;height:34px;font-size:18px}.brand small{font-size:10px}.sidebar{gap:6px}.sidebar nav{gap:2px}.nav-link{padding:8px 5px;font-size:11px}.hero{min-height:0;align-items:flex-start}.hero-art{display:none}.stats{gap:8px}.stat{padding:12px}.stat b{font-size:20px}.deck-grid,.quiz-options{grid-template-columns:1fr}.deck .art{width:92px;min-width:92px}.word-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.tile-copy{padding:10px}.tile-copy strong{font-size:17px}.tile-copy p{font-size:11px}.study-card .art,.quiz-card .art{aspect-ratio:1.2}}