:root{--ink:#17231f;--muted:#68736f;--paper:#f5f2ea;--card:#fffdf8;--line:#d9ddd6;--green:#1d5a48;--mint:#dceade;--yellow:#f2c94c;--red:#a44935;--shadow:0 18px 55px rgba(22,42,34,.09)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"Noto Sans SC","Microsoft YaHei",system-ui,sans-serif}.topbar{height:78px;padding:0 max(24px,calc((100vw - 1440px)/2));display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:rgba(245,242,234,.92);position:sticky;top:0;z-index:20;backdrop-filter:blur(14px)}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:var(--ink)}.brand-mark{width:42px;height:42px;border-radius:50%;background:var(--green);color:white;display:grid;place-items:center;font:700 12px/1 Georgia,serif;letter-spacing:.06em}.brand strong,.brand small{display:block}.brand small{color:var(--muted);font-size:11px;margin-top:3px;letter-spacing:.08em}.top-actions{display:flex;align-items:center;gap:12px}.ghost,.source-link,.chip{font:inherit}.ghost{border:1px solid var(--line);background:transparent;border-radius:99px;padding:9px 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Georgia,"Noto Serif SC",serif;margin:12px 0 7px}.aside-note{font-size:12px;color:var(--muted);line-height:1.6}.vocab-list{display:grid;margin-top:18px}.vocab{padding:13px 0;border-top:1px solid var(--line);cursor:pointer}.vocab:first-child{border-top:0}.vocab-row{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.vocab strong{font:600 17px/1.3 Georgia,serif}.vocab em{font-style:normal;color:var(--green);font-size:13px}.vocab small{display:block;color:var(--muted);margin-top:5px;line-height:1.5}.usage{display:none;background:var(--mint);padding:9px 10px;margin-top:9px;border-radius:8px;font-size:12px;line-height:1.5}.vocab.open .usage{display:block}.tip{background:var(--ink);color:white;border-radius:12px;padding:15px;margin-top:18px}.tip strong{color:var(--yellow);font-size:12px}.tip p{font-size:12px;line-height:1.6;margin:6px 0 0;color:#d2ddd8}.chapters{max-width:1440px;margin:auto;padding:70px 24px;border-top:1px solid var(--line)}.chapters h2{font:500 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1fr;gap:15px;border-radius:18px;background:var(--mint)}.note-icon{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:white}.copyright-note h2{margin:0;font:500 24px Georgia,"Noto Serif SC",serif}.copyright-note p{color:#40544c;line-height:1.7;margin:7px 0 0;max-width:900px}footer{max-width:1440px;margin:auto;padding:28px 24px 42px;border-top:1px solid var(--line);display:flex;justify-content:space-between;color:var(--muted);font-size:12px}body.focus .hero,body.focus .chapters,body.focus .copyright-note,body.focus footer{display:none}body.focus .study-shell{padding-top:24px}
@media(max-width:980px){.study-shell{grid-template-columns:1fr}.vocab-sticky{position:static}.chapter-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:620px){.topbar{height:auto;padding:12px 16px}.brand small,.ghost{display:none}.source-link{font-size:11px;padding:8px 10px}.hero{padding:42px 16px 25px}.study-shell{padding:0 12px 50px}.caption-card{border-radius:10px;padding:16px}.controls-row{align-items:stretch;flex-direction:column}.filter-group{overflow:auto}.line{grid-template-columns:48px 1fr;padding:13px 9px}.chapter-grid{grid-template-columns:1fr}.chapters{padding:50px 16px}.copyright-note{margin:0 12px 50px;grid-template-columns:1fr}footer{padding:25px 16px;gap:10px;flex-direction:column}}

/* Synchronized study workspace */
.study-shell{align-items:start}.media-sticky{position:sticky;top:88px;z-index:8;background:var(--paper);padding-bottom:4px}.caption-card{margin-top:10px;padding:16px 22px;min-height:126px}.caption-en{font-size:clamp(18px,1.65vw,25px);margin:10px 0 5px}.caption-zh{font-size:15px}.controls-row{margin:16px 0 10px}.follow{border:1px solid var(--line);background:transparent;border-radius:99px;padding:8px 12px;cursor:pointer;color:var(--muted);white-space:nowrap;font:inherit}.follow.active{color:var(--green);background:var(--mint);border-color:#b7d1c0}.transcript-shell{border:1px solid var(--line);background:rgba(255,253,248,.55);border-radius:14px;overflow:hidden}.scroll-hint{display:flex;justify-content:space-between;padding:9px 14px;color:var(--muted);font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;border-bottom:1px solid var(--line)}.transcript{gap:4px;max-height:340px;overflow-y:auto;overscroll-behavior:contain;scroll-behavior:smooth;padding:6px}.line{padding:14px 13px;border-radius:10px}.line.active{box-shadow:inset 3px 0 var(--yellow)}.vocab-sticky{top:88px;max-height:calc(100vh - 105px);display:flex;flex-direction:column}.vocab-hint{padding-left:0;padding-right:0;margin-top:8px}.vocab-list{margin-top:0;overflow-y:auto;overscroll-behavior:contain;scroll-behavior:smooth;padding-right:7px;min-height:120px}.tip{flex:0 0 auto;margin-top:14px}body.focus .study-shell{padding-top:16px}
@media(max-width:980px){.media-sticky{position:relative;top:auto}.vocab-sticky{position:static;max-height:620px}.vocab-list{max-height:360px}}@media(max-width:620px){.caption-card{padding:14px;min-height:116px}.transcript{max-height:310px}}
.vocab-nav{display:grid;grid-template-columns:42px 1fr 42px;gap:7px;margin:12px 0 4px}.vocab-nav button{border:1px solid var(--line);background:white;color:var(--ink);border-radius:9px;padding:8px;cursor:pointer;font:inherit}.vocab-nav button.active{background:var(--green);border-color:var(--green);color:white}.vocab-list{scroll-behavior:auto}.vocab-sticky{transform:translateZ(0)}

/* Interview library */
.lesson-picker{max-width:1392px;margin:28px auto 0;padding:0 24px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lesson-choice{display:grid;gap:5px;text-align:left;padding:18px 20px;border:1px solid var(--line);border-radius:15px;background:rgba(255,253,248,.7);color:var(--ink);cursor:pointer;transition:.18s;font:inherit}.lesson-choice:hover,.lesson-choice.active{border-color:var(--green);box-shadow:0 10px 30px rgba(22,42,34,.08);transform:translateY(-1px)}.lesson-choice.active{background:var(--green);color:white}.lesson-choice span{font-size:10px;letter-spacing:.12em;font-weight:800;color:var(--red)}.lesson-choice.active span{color:var(--yellow)}.lesson-choice strong{font:500 19px/1.25 Georgia,"Noto Serif SC",serif}.lesson-choice small{opacity:.68}.lesson-picker+.hero{padding-top:38px}body.focus .lesson-picker{display:none}
@media(max-width:620px){.lesson-picker{grid-template-columns:1fr;padding:0 16px;margin-top:18px}.lesson-choice{padding:14px 16px}.lesson-picker+.hero{padding-top:30px}}

/* Newsletter signup */
.signup-section{max-width:1392px;margin:0 auto 70px;padding:42px;display:grid;grid-template-columns:minmax(250px,.8fr) minmax(0,1.2fr);gap:38px;align-items:center;border-radius:20px;background:var(--green);color:white;box-shadow:var(--shadow)}.signup-section .eyebrow{color:var(--yellow);margin-top:0}.signup-section h2{font:500 clamp(30px,4vw,46px)/1.12 Georgia,"Noto Serif SC",serif;margin:10px 0 16px}.signup-copy>p{line-height:1.7;color:#d7e1dd;max-width:440px}.signup-copy .signup-english{font:500 16px/1.5 Georgia,serif;color:white}.signup-form-wrap{min-height:380px;background:white;border-radius:14px;overflow:hidden}.signup-frame{display:block;width:100%;height:410px;border:0;background:white}.subscription-notice{position:fixed;right:24px;bottom:24px;z-index:50;max-width:430px;padding:16px 20px;border-radius:13px;background:#fffdf8;color:var(--ink);border:1px solid var(--line);box-shadow:0 16px 45px rgba(0,0,0,.18)}.subscription-notice strong,.subscription-notice span{display:block}.subscription-notice strong{color:var(--green);margin-bottom:5px}.subscription-notice span{font-size:13px;line-height:1.5;color:var(--muted)}body.focus .signup-section{display:none}@media(max-width:980px){.signup-section{margin:0 24px 50px;grid-template-columns:1fr;padding:28px}.signup-form-wrap{min-height:400px}}@media(max-width:620px){.signup-section{margin:0 12px 44px;padding:22px}.signup-form-wrap{margin:0 -4px;min-height:430px}.signup-frame{height:445px}.subscription-notice{right:12px;bottom:12px;left:12px;max-width:none}}