/* Academic Studio — original advanced Chinese learning experience. */
.academic-home-link{display:flex;align-items:center;gap:16px;padding:20px 24px;border-radius:20px;background:linear-gradient(110deg,#e7f5ee,#f6faf3 66%,#fff5df);border:1px solid #cde6d7;margin:20px 0}
.academic-home-icon{display:grid;place-items:center;min-width:61px;height:61px;border-radius:16px;background:#146d54;color:#fff;font:34px "KaiTi","Microsoft YaHei",serif}
.academic-home-link>div{flex:1;min-width:0;display:grid;gap:7px}.academic-home-link strong{font-size:18px;color:#194c38}.academic-home-link small{line-height:1.65;color:#516e5c}.academic-home-link .btn{white-space:nowrap}
.academic-studio{--as-ink:#233d33;--as-muted:#547067;--as-card:#fff;--as-edge:#dce9df;--as-soft:#f1f8f2;--as-forest:#115b43;--as-gold:#d9af6b;max-width:1400px;margin:0 auto}
.as-hero{display:flex;align-items:stretch;justify-content:space-between;gap:30px;padding:36px 40px;color:#fff;border-radius:26px;background:radial-gradient(circle at 85% 10%,#438768 0,transparent 41%),linear-gradient(115deg,#0d3930,#195d45 72%,#347759);box-shadow:0 20px 45px #073f2c1d}
.as-hero>div:first-child{max-width:760px}.as-kicker{font-size:11px;font-weight:850;letter-spacing:.1em;text-transform:uppercase;color:#4ab18c}.as-hero .as-kicker{color:#b4e8c9}
.as-hero h1{font-size:clamp(30px,4.5vw,54px);letter-spacing:-1.8px;line-height:1.13;margin:18px 0}.as-hero h1 em{font-style:normal;color:#e5d49c}
.as-hero p{line-height:1.8;color:#e1f4e8;font-size:14px}.as-secondary-link{font-size:13px;color:#d0f1df;text-decoration:underline;text-underline-offset:5px;font-weight:750;display:inline-block;margin-top:12px}
.as-hero-stat{display:flex;flex-direction:column;align-self:center;gap:8px;text-align:center;min-width:196px;border:1px solid #ffffff4d;background:#ffffff15;padding:25px 20px;border-radius:20px}
.as-hero-stat strong{font-size:51px;letter-spacing:-2px}.as-hero-stat span{font-size:12px;line-height:1.6;color:#e0f3e6}
.as-notice{margin:17px 0 22px;padding:15px 19px;border:1px solid #e0d7b7;background:#fcf9ef;color:#695833;border-radius:14px;line-height:1.75;font-size:12.5px}
.as-levels{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:23px 0}
.as-level{display:flex;flex-direction:column;align-items:stretch;min-height:174px;gap:13px;padding:20px 18px;text-align:left;border-radius:17px;background:var(--as-card);color:var(--as-ink);border:1px solid var(--as-edge);cursor:pointer;transition:transform .16s,border-color .16s,box-shadow .16s}
.as-level:hover{transform:translateY(-3px);border-color:#58b78a}.as-level.active{border:2px solid #27896c;box-shadow:0 0 0 3px #27896c19}
.as-level-top{display:flex;justify-content:space-between;gap:10px;align-items:center;font-size:11px;color:#287b63;font-weight:850;letter-spacing:.03em}.as-level-top span:last-child{color:var(--as-muted);font-weight:650}
.as-level strong{font-size:15px}.as-level-desc{font-size:11.5px;line-height:1.65;color:var(--as-muted);flex:1}
.as-progress{display:block;width:100%;height:7px;background:#e7efe8;border-radius:99px;overflow:hidden}.as-progress span{display:block;height:100%;background:linear-gradient(90deg,#1b8f6b,#a1d29c);border-radius:inherit}
.as-layout{display:grid;grid-template-columns:minmax(240px,300px) minmax(0,1fr);gap:20px;align-items:start}
.as-catalog{border:1px solid var(--as-edge);background:var(--as-card);border-radius:19px;padding:21px;position:sticky;top:18px}
.as-catalog-top{display:flex;align-items:center;justify-content:space-between;gap:10px}.as-catalog-top h2{font-size:16px;letter-spacing:-.3px;margin:0}.as-catalog-top span{font-size:10px;color:var(--as-muted)}
.as-catalog-items{display:grid;gap:8px;margin-top:17px}.as-lesson{background:transparent;border:1px solid var(--as-edge);color:var(--as-ink);border-radius:12px;padding:13px 12px;display:grid;grid-template-columns:32px minmax(0,1fr);column-gap:10px;row-gap:7px;width:100%;text-align:left;cursor:pointer}
.as-lesson:hover,.as-lesson.selected{border-color:#41a780;background:var(--as-soft)}.as-lesson.selected{box-shadow:0 0 0 2px #23805d1c}
.as-lesson-number{height:31px;width:31px;border-radius:9px;background:#e3f0e8;color:#207151;display:grid;place-items:center;font-weight:900;font-size:11px}
.as-lesson-name{min-width:0;display:grid;gap:5px}.as-lesson-name strong{font-size:12.5px}.as-lesson-name small{font-size:10px;color:var(--as-muted);line-height:1.5}
.as-lesson-status{grid-column:2;font-size:10.5px;color:#287b63;font-weight:700}
.as-study-note{margin:18px 0 15px;padding:15px;border:1px dashed #a9cdb8;border-radius:13px;background:var(--as-soft)}.as-study-note b{font-size:12px}.as-study-note p{font-size:11px;line-height:1.8;color:var(--as-muted);margin:7px 0 0}
.as-review{width:100%;font-size:11.5px}
.as-workspace{min-width:0;border:1px solid var(--as-edge);background:var(--as-card);border-radius:20px;padding:24px}
.as-workspace-heading{display:flex;justify-content:space-between;gap:13px;flex-wrap:wrap;align-items:center}
.as-duration{font-size:11px;color:var(--as-muted)}.as-workspace h2{font-size:clamp(22px,2.6vw,32px);margin:10px 0;letter-spacing:-.5px;color:var(--as-ink)}
.as-goal{font-size:12.5px;color:var(--as-muted);line-height:1.75}
.as-steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:21px 0 24px}.as-steps span{padding:12px 8px;background:var(--as-soft);border-radius:10px;font-size:10px;color:var(--as-muted);text-align:center;line-height:1.7}.as-steps b{display:block;color:#277c5e;font-size:14px}
.as-card{background:var(--as-card);border:1px solid var(--as-edge);border-radius:16px;padding:21px;margin-top:17px}.as-card h3{font-size:17px;margin:0 0 14px;color:var(--as-ink)}
.as-card-heading{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:13px}.as-card-heading h3{margin:0}
.as-reading{font-family:"Noto Sans CJK SC","Microsoft YaHei","PingFang SC",sans-serif;font-size:clamp(19px,2vw,24px);line-height:2.1;letter-spacing:.015em;color:var(--as-ink);margin:16px 0 20px;overflow-wrap:anywhere}
.as-actions{display:flex;gap:9px;flex-wrap:wrap;align-items:center}.as-actions .btn,.as-card-heading .btn{font-size:11px;padding:10px 13px}
.as-hint{color:var(--as-muted);font-size:12px;line-height:1.7}.as-translation,.as-model{border-left:3px solid #3b9578;border-radius:8px;background:var(--as-soft);padding:14px 18px;color:var(--as-ink);font-size:13px;line-height:1.85;margin-top:15px}
.as-vocab{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}
.as-word{border:1px solid var(--as-edge);border-radius:11px;padding:13px;display:grid;gap:8px;min-width:0}.as-word b{font-size:21px;color:var(--as-ink)}.as-word span{font-size:11px;color:var(--as-muted);line-height:1.6}.as-word button{justify-self:start;border:0;background:#e4f2e8;color:#207455;border-radius:8px;padding:7px 12px;font-size:11px;font-weight:750}
.as-pill{padding:7px 10px;border-radius:12px;background:var(--as-soft);color:#27815d;font-size:11px;font-weight:750}
.as-question{font:600 clamp(17px,2vw,21px)/1.75 "Microsoft YaHei",sans-serif;color:var(--as-ink)}
.as-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:18px}
.as-choice{min-height:72px;background:#f7faf8;border:1px solid #cfded2;border-radius:11px;padding:13px 15px;text-align:left;color:#233d33;font-size:13px;line-height:1.7;font-family:"Microsoft YaHei",sans-serif;font-weight:600}
.as-choice:hover:not(:disabled){border-color:#288b64;background:#eef8f1}.as-choice:disabled{opacity:1;cursor:default}
.as-choice.correct{background:#def7e8;border:2px solid #15945e;color:#145238}.as-choice.incorrect{background:#ffe7e8;border:2px solid #d54858;color:#8c2635}
.as-answer-feedback{border-radius:12px;padding:13px 17px;margin:15px 0;font-size:12.5px;line-height:1.8}.as-answer-feedback p{margin:5px 0}.as-answer-feedback.good{background:#e3f8ed;color:#175b3c}.as-answer-feedback.bad{background:#ffeaed;color:#8c2635}
.as-task{line-height:1.9;font-size:13px;color:var(--as-ink)}.as-write-label{display:block;font-size:12px;color:var(--as-ink);font-weight:750;margin:14px 0 9px}
.as-draft{resize:vertical;min-height:134px;width:100%;border:1px solid #bccfc1;border-radius:12px;padding:15px;font:14px/1.9 "Microsoft YaHei","Segoe UI",sans-serif;background:var(--as-card);color:var(--as-ink)}
.as-writing-bar{display:flex;justify-content:space-between;gap:13px;flex-wrap:wrap;align-items:center;margin:10px 0 21px}.as-writing-bar span{font-size:11px;color:var(--as-muted)}
.as-model p{font-size:15px;line-height:2;color:var(--as-ink);font-family:"Microsoft YaHei",sans-serif}
.as-speaking-tip{padding:12px 14px;background:var(--as-soft);color:var(--as-muted);font-size:12px;line-height:1.8;border-radius:12px}
.as-writing-check{display:flex;align-items:flex-start;gap:10px;font-size:12px;line-height:1.6;color:var(--as-ink);margin-top:14px;cursor:pointer}.as-writing-check input{width:17px;height:17px;accent-color:#228363;flex-shrink:0}
.as-privacy{font-size:11px;line-height:1.85;color:var(--as-muted);margin:22px 0 0}.as-privacy a{color:#268664;text-decoration:underline;text-underline-offset:3px}
body.dark .academic-home-link{background:linear-gradient(120deg,#20382a,#2a3229);border-color:#425b45}
body.dark .academic-home-link strong{color:#d9f3e5}body.dark .academic-home-link small{color:#b5ceb9}
body.dark .academic-studio{--as-ink:#e0f3e6;--as-muted:#aec3b5;--as-card:#1d2a22;--as-edge:#3e5645;--as-soft:#263c2e}
body.dark .as-notice{background:#3c3326;border-color:#756342;color:#f0dbb5}
body.dark .as-level.active,body.dark .as-lesson.selected{border-color:#66c99e}
body.dark .as-level-top{color:#89dbb8}body.dark .as-lesson-number{background:#345643;color:#baf4d2}
body.dark .as-word button{background:#2d513d;color:#c6f0d4}
body.dark .as-pill{color:#b9ebcf}body.dark .as-choice{background:#25392e;border-color:#52715b;color:#e0f3e6}
body.dark .as-choice.correct{background:#174a35;border-color:#68df9f;color:#e3ffef}body.dark .as-choice.incorrect{background:#522831;border-color:#ff9bab;color:#ffe1e6}
body.dark .as-answer-feedback.good{background:#214733;color:#c4f8dc}body.dark .as-answer-feedback.bad{background:#522b36;color:#ffcdd5}
body.dark .as-draft{border-color:#53705a}
@media(max-width:1120px){.as-levels{grid-template-columns:repeat(2,minmax(0,1fr))}.as-layout{grid-template-columns:240px minmax(0,1fr)}.as-steps{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.academic-home-link{flex-wrap:wrap;padding:15px}.academic-home-link .btn{width:100%;text-align:center}.as-hero{flex-direction:column;padding:29px 22px}.as-hero-stat{align-self:stretch;min-width:0}.as-levels{gap:9px}.as-level{min-height:185px;padding:14px}.as-layout{grid-template-columns:1fr}.as-catalog{position:static;padding:16px}.as-catalog-items{grid-template-columns:repeat(3,minmax(0,1fr))}.as-lesson{grid-template-columns:1fr;padding:11px}.as-lesson-number{height:28px;width:28px}.as-lesson-status{grid-column:1}.as-workspace{padding:14px}.as-card{padding:15px}.as-options{grid-template-columns:1fr}}
@media(max-width:480px){.as-hero h1{font-size:33px}.as-levels{grid-template-columns:1fr}.as-level{min-height:0}.as-vocab{grid-template-columns:1fr}.as-catalog-items{grid-template-columns:1fr}.as-steps{grid-template-columns:1fr 1fr}.as-writing-bar .btn{width:100%}}
@media(prefers-reduced-motion:reduce){.as-level{transition:none}}