:root{--bg:#f8f9f6;--surface:#fff;--surface-soft:#f3f6f1;--ink:#253b39;--muted:#778680;--line:#e6ebe5;--green:#285e53;--green-dark:#1d4f46;--mint:#e7f3ed;--peach:#fae7da;--sand:#fff1d8;--blue:#e7f0fd;--rose:#fae5e6;--yellow:#f2d883;--shadow:0 10px 40px rgba(37,57,52,.05);--radius:22px;--sidebar-width:259px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:'DM Sans',sans-serif;-webkit-font-smoothing:antialiased;font-size:15px;line-height:1.55}body.theme-mist{--bg:#f4f5f5;--surface-soft:#ebeeee;--mint:#e6eeeb;--peach:#f0e9e6;--sand:#f1efea;--blue:#e8edf0;--rose:#eee9eb;--line:#e0e5e3}button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.53}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}h1,h2,h3,h4,p{margin-top:0}h1,h2,h3,h4{font-family:Manrope,'DM Sans',sans-serif;letter-spacing:-.05em;line-height:1.18}h1{font-size:clamp(34px,3.3vw,50px);font-weight:800}h2{font-size:clamp(25px,2.4vw,34px);font-weight:800}h3{font-size:20px;font-weight:800}p{color:#687b73}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible{outline:3px solid #80b7a4;outline-offset:3px}::selection{background:#cde7da}
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@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

/* ===== Chapter 02 · The Year — compatible with the original light theme ===== */
.c2-home-promo{display:grid;grid-template-columns:1fr .82fr;align-items:center;gap:20px;margin:24px 0 36px;padding:26px 30px;border:1px solid #d8e7da;border-radius:22px;background:linear-gradient(115deg,#f7faf3,#edf5ea);box-shadow:0 8px 24px #204e3110;overflow:hidden}.c2-home-promo h2{font-size:24px;line-height:1.2;margin:13px 0 8px;color:#315c49}.c2-home-promo p{font-size:13px;line-height:1.7;max-width:480px;margin-bottom:20px}.c2-home-promo img{width:100%;height:205px;object-fit:contain;border-radius:15px}.c2-tabs{display:flex;align-items:center;gap:6px;padding:6px;margin:0 0 24px;border:1px solid #e0e9e1;background:#f7faf7;border-radius:17px;overflow-x:auto;scrollbar-width:thin}.c2-tabs button{border:0;background:transparent;border-radius:12px;color:#657a6e;padding:11px 15px;white-space:nowrap;font:700 12px 'DM Sans',sans-serif;cursor:pointer;transition:background .15s,color .15s}.c2-tabs button:hover{background:#e8f2e9}.c2-tabs button.active{background:#fff;color:#277452;box-shadow:0 3px 12px #19352b14}.c2-hero{display:grid;grid-template-columns:.88fr 1.12fr;align-items:center;gap:12px;background:linear-gradient(123deg,#ecf6ed,#fafcf8);border:1px solid #e1ebe2;border-radius:23px;padding:25px 24px 24px 34px;min-height:290px;overflow:hidden}.c2-hero h2{font-size:clamp(29px,3vw,48px);line-height:1.14;letter-spacing:-1.5px;color:#285d4c;margin:16px 0 12px;font-weight:800}.c2-hero h2 em{font-style:normal;color:#75aa86}.c2-hero p{font-size:14px;line-height:1.7;max-width:420px;color:#687d6e}.c2-hero img{max-width:100%;width:100%;filter:drop-shadow(0 8px 11px #5270590c)}.c2-stats{margin-top:18px}.c2-feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-bottom:28px}.c2-feature{border:1px solid #e3ebe2;background:white;padding:15px;text-align:left;color:#31483b;cursor:pointer;display:flex;flex-direction:column;gap:8px;transition:transform .14s,box-shadow .14s}.c2-feature:hover{transform:translateY(-2px);box-shadow:0 12px 20px #375e4416}.c2-feature-count{display:flex;justify-content:space-between;color:#599270;font-size:12px;font-weight:850;letter-spacing:.12em}.c2-feature img{width:100%;height:132px;object-fit:cover;background:#f2f8f2;border-radius:11px}.c2-feature strong{font-size:17px}.c2-feature>span:last-child{font-size:12px;line-height:1.6;color:#819286}.c2-note{border-radius:16px;padding:24px 27px;background:#e9f3eb;border:1px solid #d7e9d9;color:#3e614e}.c2-note p{margin:8px 0 0;font-size:13px;line-height:1.8;color:#597564}.c2-lesson-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:20px;align-items:start}.c2-step-list{position:sticky;top:18px;padding:15px;display:flex;flex-direction:column;gap:6px}.c2-step-list>.tag{margin:0 0 10px 8px}.c2-step{display:flex;align-items:center;gap:10px;border:0;background:transparent;text-align:left;border-radius:11px;padding:12px 9px;color:#62786b;font-size:12px;cursor:pointer}.c2-step:hover{background:#f2f7f0}.c2-step.active{background:#e9f3e9;color:#28694c}.c2-step span{width:27px;height:27px;display:grid;place-items:center;flex:none;border-radius:8px;background:#e7f0e5;color:#4c7d60;font-weight:800}.c2-step strong{flex:1;font-size:12px}.c2-lesson{padding:26px}.c2-lesson h2{font-size:clamp(25px,2.8vw,33px);letter-spacing:-.7px;margin:18px 0 5px;color:#304f41}.c2-lesson>p{font-size:14px}.c2-main-visual{width:100%;display:block;object-fit:contain;max-height:410px;margin:22px 0 18px;border:1px solid #e1ebdf;border-radius:15px;background:#f5f9f4}.c2-label-row{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:10px 0 16px}.c2-question{margin-top:23px;padding:23px;background:#ecf4e9;border:1px solid #dce9d7;border-radius:16px}.c2-question h3{font-size:23px;color:#305c49;margin:14px 0 10px}.c2-question p{font-size:13px;color:#718575}.c2-answer{padding:13px;margin-top:13px;border-radius:10px;background:#fff;font-size:15px;color:#346d53;font-weight:700}.c2-plain-btn{border:0;background:transparent;cursor:pointer;font-size:18px}.c2-lessons-actions{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:24px}.c2-start{padding:47px 25px;max-width:750px;margin:0 auto;text-align:center;display:flex;flex-direction:column;align-items:center;gap:15px}.c2-start h2{font-size:32px;margin:0}.c2-start>p{font-size:14px;color:#738578;line-height:1.7;max-width:540px}.c2-start .flex-row{justify-content:center}.c2-big-symbol{width:84px;height:84px;border-radius:22px;background:#e6f3e7;display:grid;place-items:center;color:#437e60;font-size:42px}.c2-dictation{display:flex;align-items:center;justify-content:space-between;gap:10px}.c2-quiz{max-width:810px;margin:auto}.c2-quiz h2{line-height:1.35}.c2-quiz .feedback{margin-top:20px}.c2-root .chat-compose input,.c2-root .answer-input{min-width:0}.c2-root .original-side .source-note{font-size:11px}
@media(max-width:1050px){.c2-lesson-layout{grid-template-columns:160px 1fr}.c2-step-list{padding:10px}.c2-step{padding:10px 4px}.c2-step strong{font-size:11px}.c2-feature img{height:100px}.c2-hero{padding:21px}}
@media(max-width:850px){.c2-lesson-layout{grid-template-columns:1fr}.c2-step-list{position:static;flex-direction:row;overflow-x:auto;scrollbar-width:thin;align-items:center}.c2-step-list>.tag{display:none}.c2-step{min-width:135px;flex-shrink:0}.c2-feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.c2-hero{grid-template-columns:1fr 1fr}.c2-home-promo{grid-template-columns:1fr .75fr}}
@media(max-width:620px){.c2-home-promo{grid-template-columns:1fr;padding:21px}.c2-home-promo img{height:150px}.c2-tabs{margin-bottom:18px;position:relative;border-radius:13px}.c2-tabs button{padding:11px 12px;font-size:11px}.c2-hero{grid-template-columns:1fr;padding:21px}.c2-hero h2{font-size:34px}.c2-hero img{max-height:215px}.c2-feature-grid{gap:10px}.c2-feature{padding:11px}.c2-feature img{height:88px}.c2-feature strong{font-size:14px}.c2-feature>span:last-child{font-size:11px}.c2-lesson{padding:20px 14px}.c2-lesson h2{font-size:28px}.c2-main-visual{margin:15px 0;max-height:250px}.c2-question{padding:17px}.c2-lessons-actions{gap:8px}.c2-lessons-actions .btn{font-size:11px;padding:10px}.c2-start{padding:32px 16px}.c2-start h2{font-size:26px}.c2-dictation{flex-wrap:wrap}.c2-quiz{padding:21px 15px}}
.c2-mini-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:1px 0 18px;font-size:11px;color:#7c9283}.c2-mini-head span{letter-spacing:.14em;font-weight:800}.c2-mini-head strong{font-weight:750;color:#376f55}
@media(max-width:620px){.c2-mini-head{align-items:flex-start;flex-direction:column;gap:6px}}


/* Chapter 03: dedicated scene components, preserving Chapter 02 CSS */
/* ===== Chapter 03 · Names — compatible with the original light theme ===== */
.c3-home-promo{display:grid;grid-template-columns:1fr .82fr;align-items:center;gap:20px;margin:24px 0 36px;padding:26px 30px;border:1px solid #d8e7da;border-radius:22px;background:linear-gradient(115deg,#f7faf3,#edf5ea);box-shadow:0 8px 24px #204e3110;overflow:hidden}.c3-home-promo h2{font-size:24px;line-height:1.2;margin:13px 0 8px;color:#315c49}.c3-home-promo p{font-size:13px;line-height:1.7;max-width:480px;margin-bottom:20px}.c3-home-promo img{width:100%;height:205px;object-fit:contain;border-radius:15px}.c3-tabs{display:flex;align-items:center;gap:6px;padding:6px;margin:0 0 24px;border:1px solid #e0e9e1;background:#f7faf7;border-radius:17px;overflow-x:auto;scrollbar-width:thin}.c3-tabs button{border:0;background:transparent;border-radius:12px;color:#657a6e;padding:11px 15px;white-space:nowrap;font:700 12px 'DM Sans',sans-serif;cursor:pointer;transition:background .15s,color .15s}.c3-tabs button:hover{background:#e8f2e9}.c3-tabs button.active{background:#fff;color:#277452;box-shadow:0 3px 12px #19352b14}.c3-hero{display:grid;grid-template-columns:.88fr 1.12fr;align-items:center;gap:12px;background:linear-gradient(123deg,#ecf6ed,#fafcf8);border:1px solid #e1ebe2;border-radius:23px;padding:25px 24px 24px 34px;min-height:290px;overflow:hidden}.c3-hero h2{font-size:clamp(29px,3vw,48px);line-height:1.14;letter-spacing:-1.5px;color:#285d4c;margin:16px 0 12px;font-weight:800}.c3-hero h2 em{font-style:normal;color:#75aa86}.c3-hero p{font-size:14px;line-height:1.7;max-width:420px;color:#687d6e}.c3-hero img{max-width:100%;width:100%;filter:drop-shadow(0 8px 11px #5270590c)}.c3-stats{margin-top:18px}.c3-feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-bottom:28px}.c3-feature{border:1px solid #e3ebe2;background:white;padding:15px;text-align:left;color:#31483b;cursor:pointer;display:flex;flex-direction:column;gap:8px;transition:transform .14s,box-shadow .14s}.c3-feature:hover{transform:translateY(-2px);box-shadow:0 12px 20px #375e4416}.c3-feature-count{display:flex;justify-content:space-between;color:#599270;font-size:12px;font-weight:850;letter-spacing:.12em}.c3-feature img{width:100%;height:132px;object-fit:cover;background:#f2f8f2;border-radius:11px}.c3-feature strong{font-size:17px}.c3-feature>span:last-child{font-size:12px;line-height:1.6;color:#819286}.c3-note{border-radius:16px;padding:24px 27px;background:#e9f3eb;border:1px solid #d7e9d9;color:#3e614e}.c3-note p{margin:8px 0 0;font-size:13px;line-height:1.8;color:#597564}.c3-lesson-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:20px;align-items:start}.c3-step-list{position:sticky;top:18px;padding:15px;display:flex;flex-direction:column;gap:6px}.c3-step-list>.tag{margin:0 0 10px 8px}.c3-step{display:flex;align-items:center;gap:10px;border:0;background:transparent;text-align:left;border-radius:11px;padding:12px 9px;color:#62786b;font-size:12px;cursor:pointer}.c3-step:hover{background:#f2f7f0}.c3-step.active{background:#e9f3e9;color:#28694c}.c3-step span{width:27px;height:27px;display:grid;place-items:center;flex:none;border-radius:8px;background:#e7f0e5;color:#4c7d60;font-weight:800}.c3-step strong{flex:1;font-size:12px}.c3-lesson{padding:26px}.c3-lesson h2{font-size:clamp(25px,2.8vw,33px);letter-spacing:-.7px;margin:18px 0 5px;color:#304f41}.c3-lesson>p{font-size:14px}.c3-main-visual{width:100%;display:block;object-fit:contain;max-height:410px;margin:22px 0 18px;border:1px solid #e1ebdf;border-radius:15px;background:#f5f9f4}.c3-label-row{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:10px 0 16px}.c3-question{margin-top:23px;padding:23px;background:#ecf4e9;border:1px solid #dce9d7;border-radius:16px}.c3-question h3{font-size:23px;color:#305c49;margin:14px 0 10px}.c3-question p{font-size:13px;color:#718575}.c3-answer{padding:13px;margin-top:13px;border-radius:10px;background:#fff;font-size:15px;color:#346d53;font-weight:700}.c3-plain-btn{border:0;background:transparent;cursor:pointer;font-size:18px}.c3-lessons-actions{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:24px}.c3-start{padding:47px 25px;max-width:750px;margin:0 auto;text-align:center;display:flex;flex-direction:column;align-items:center;gap:15px}.c3-start h2{font-size:32px;margin:0}.c3-start>p{font-size:14px;color:#738578;line-height:1.7;max-width:540px}.c3-start .flex-row{justify-content:center}.c3-big-symbol{width:84px;height:84px;border-radius:22px;background:#e6f3e7;display:grid;place-items:center;color:#437e60;font-size:42px}.c3-dictation{display:flex;align-items:center;justify-content:space-between;gap:10px}.c3-quiz{max-width:810px;margin:auto}.c3-quiz h2{line-height:1.35}.c3-quiz .feedback{margin-top:20px}.c3-root .chat-compose input,.c3-root .answer-input{min-width:0}.c3-root .original-side .source-note{font-size:11px}
@media(max-width:1050px){.c3-lesson-layout{grid-template-columns:160px 1fr}.c3-step-list{padding:10px}.c3-step{padding:10px 4px}.c3-step strong{font-size:11px}.c3-feature img{height:100px}.c3-hero{padding:21px}}
@media(max-width:850px){.c3-lesson-layout{grid-template-columns:1fr}.c3-step-list{position:static;flex-direction:row;overflow-x:auto;scrollbar-width:thin;align-items:center}.c3-step-list>.tag{display:none}.c3-step{min-width:135px;flex-shrink:0}.c3-feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.c3-hero{grid-template-columns:1fr 1fr}.c3-home-promo{grid-template-columns:1fr .75fr}}
@media(max-width:620px){.c3-home-promo{grid-template-columns:1fr;padding:21px}.c3-home-promo img{height:150px}.c3-tabs{margin-bottom:18px;position:relative;border-radius:13px}.c3-tabs button{padding:11px 12px;font-size:11px}.c3-hero{grid-template-columns:1fr;padding:21px}.c3-hero h2{font-size:34px}.c3-hero img{max-height:215px}.c3-feature-grid{gap:10px}.c3-feature{padding:11px}.c3-feature img{height:88px}.c3-feature strong{font-size:14px}.c3-feature>span:last-child{font-size:11px}.c3-lesson{padding:20px 14px}.c3-lesson h2{font-size:28px}.c3-main-visual{margin:15px 0;max-height:250px}.c3-question{padding:17px}.c3-lessons-actions{gap:8px}.c3-lessons-actions .btn{font-size:11px;padding:10px}.c3-start{padding:32px 16px}.c3-start h2{font-size:26px}.c3-dictation{flex-wrap:wrap}.c3-quiz{padding:21px 15px}}
.c3-mini-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:1px 0 18px;font-size:11px;color:#7c9283}.c3-mini-head span{letter-spacing:.14em;font-weight:800}.c3-mini-head strong{font-weight:750;color:#376f55}
@media(max-width:620px){.c3-mini-head{align-items:flex-start;flex-direction:column;gap:6px}}

.c3-home-promo{background:linear-gradient(115deg,#f3f8f4,#fceff3);border-color:#e3e9e0;margin:0 0 18px}
.c3-home-promo h2{color:#356b55}
.c3-hero{background:linear-gradient(125deg,#ecf5ec,#faf5f0)}
.c3-feature img{object-fit:contain;background:#f7faf5}
.c3-lesson .c3-main-visual{object-fit:contain}
@media(max-width:620px){.mobile-bottom-nav button{min-width:0;font-size:9px;padding-left:0;padding-right:0}.mobile-bottom-nav svg{width:19px;height:19px}.c3-home-promo{margin-bottom:18px}}

/* Nature English v1.3.0 · Four-chapter course navigation */
.c4-course-track{margin:0 0 26px;padding:26px;background:#fff}
.c4-explorer-top{display:flex;justify-content:space-between;align-items:start;gap:15px;margin-bottom:21px}
.c4-explorer-top h2{font-size:24px;letter-spacing:-.04em;margin:8px 0 6px;color:#234a38}
.c4-explorer-top p{font-size:13px;color:#708276;margin:0}
.c4-track-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.c4-track-item{border:1px solid #e3ebe5;background:#f8fbf8;border-radius:14px;text-align:left;padding:17px;display:flex;flex-direction:column;gap:9px;cursor:pointer;color:#28523c;min-width:0;transition:transform .17s,box-shadow .17s}
.c4-track-item:hover,.c4-city:hover{transform:translateY(-2px);box-shadow:0 7px 20px #315c4920}
.c4-track-num{color:#9bac9f;font-size:11px;font-weight:800;letter-spacing:.1em}
.c4-track-item strong{font-size:14px;line-height:1.35}
.c4-track-item small{color:#708577;font-size:11px}
.c4-track{height:6px;background:#e6eee6;border-radius:20px;overflow:hidden;display:block;margin-top:auto}
.c4-track>span{display:block;height:100%;background:#79ac92;border-radius:inherit}
.c4-track-cta{font-size:11px;font-weight:750;color:#3d8567}
.c4-home-promo{background:linear-gradient(120deg,#eaf3ea,#f0f5ff);border-color:#d7e8d9;margin-bottom:17px}
.c4-home-promo img{object-fit:contain;background:#fff9;border-radius:15px}
.c4-explorer{margin:24px 0;padding:24px 25px}
.c4-city-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.c4-city{display:flex;align-items:center;gap:10px;flex-wrap:wrap;border:1px solid #dfe9e1;padding:13px;border-radius:13px;text-align:left;background:#f8faf7;cursor:pointer;color:#295944;transition:transform .17s,box-shadow .17s}
.c4-city-graphic{font-size:19px;width:36px;height:36px;border-radius:10px;background:#e4f0e6;display:grid;place-items:center}
.c4-city strong{font-size:14px;flex:1}.c4-city small{display:block;flex-basis:100%;margin-left:46px;color:#6d8477;font-size:12px}
.c4-sound{margin-left:auto;color:#719985;font-size:17px}
@media(max-width:1100px){.c4-track-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:620px){.c4-track-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.c4-course-track,.c4-explorer{padding:17px}.c4-track-item{padding:13px}.c4-track-item strong{font-size:12px}.c4-explorer-top{flex-wrap:wrap}.c4-city-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.c4-city{padding:10px;gap:5px}.c4-city strong{font-size:12px}.c4-city-graphic{width:26px;height:26px;font-size:16px}.c4-city small{margin-left:31px;font-size:11px}.c4-home-promo img{height:150px}}
@media print{.c4-course-track,.c4-explorer{display:none!important}}