:root{--bg:#fff7ed;--surface:#fff;--warm:#ffedd5;--accent:#ea580c;--accent2:#f97316;--ink:#431407;--muted:#7c2d12;--border:#fed7aa;--green:#16a34a;--blue:#2563eb;--teal:#0f766e;--gold:#ca8a04;--rose:#be123c}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.75}
.topbar{background:var(--accent);color:#fff;display:flex;align-items:center;gap:16px;padding:18px max(20px,calc((100vw - 980px)/2));box-shadow:0 2px 14px rgba(234,88,12,.22)}
.logo{width:132px;background:#fff;border-radius:8px;padding:7px 10px;display:inline-flex}.logo img{width:100%;height:auto}.eyebrow{font-size:12px;opacity:.85}.topbar h1{font-size:22px;margin:2px 0 0}
.wrap{max-width:980px;margin:0 auto;padding:24px 16px 56px}.panel,.reading-card,.exercise-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:0 10px 28px rgba(194,65,12,.08);padding:22px;margin-bottom:18px}
.hero h2{font-size:30px;margin:8px 0}.hero small{display:block;font-size:16px;color:var(--muted);font-weight:600}.badge,.pos{display:inline-flex;border-radius:999px;background:var(--warm);color:#9a3412;border:1px solid var(--border);padding:3px 10px;font-weight:800;font-size:12px}
.lesson-jump-nav{display:flex;flex-wrap:nowrap;gap:10px;align-items:center;background:#fff3e4;border:1px solid var(--border);border-radius:0;padding:12px 26px;margin:0 calc(50% - 50vw) 18px;width:100vw;overflow-x:auto;box-shadow:0 8px 20px rgba(194,65,12,.06)}.lesson-jump-nav::-webkit-scrollbar{height:6px}.lesson-jump-nav::-webkit-scrollbar-thumb{background:#fdba74;border-radius:999px}.lesson-jump-nav a{display:inline-flex;align-items:center;justify-content:center;min-height:42px;border:1px solid var(--border);border-radius:999px;background:#fff7ed;color:#7c2d12;text-decoration:none;font-weight:900;padding:8px 16px;white-space:nowrap;flex:0 0 auto}.lesson-jump-nav a.active{background:var(--accent2);border-color:var(--accent2);color:#fff;box-shadow:0 8px 18px rgba(249,115,22,.22)}
.page-actions{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 18px}.back-link{display:inline-flex;align-items:center;border-radius:999px;background:var(--accent);color:#fff;text-decoration:none;padding:8px 14px;font-weight:900}.back-link.subtle{background:#fff;color:var(--accent);border:1px solid var(--border)}
.lesson-module-switcher{display:flex;flex-wrap:wrap;gap:16px;align-items:center;background:#fff;border:1px solid var(--border);border-radius:14px;padding:14px 16px;margin:0 0 18px;box-shadow:0 8px 20px rgba(194,65,12,.06)}.lesson-module-switcher a{display:inline-flex;align-items:center;gap:6px;color:#8a7a70;text-decoration:none;font-weight:800;border-radius:8px;padding:8px 10px}.lesson-module-switcher a span{display:inline-grid;place-items:center;width:20px;height:20px;border:1px solid currentColor;border-radius:50%;font-size:12px}.lesson-module-switcher a.active{background:linear-gradient(135deg,#f97316,#fb923c);color:#fff;box-shadow:0 6px 16px rgba(249,115,22,.22)}
.module-bottom-pager{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:stretch;background:#fff;border:1px solid var(--border);border-radius:14px;padding:12px;margin:22px 0 0;box-shadow:0 8px 20px rgba(194,65,12,.06)}.pager-link,.pager-home{min-height:58px;border-radius:12px;text-decoration:none;display:flex;align-items:center;justify-content:center;font-weight:900}.pager-link{background:#fff7ed;border:1px solid var(--border);color:var(--ink);flex-direction:column;padding:8px 14px}.pager-link span{font-size:12px;color:var(--muted)}.pager-link strong{font-size:16px}.pager-link.prev{align-items:flex-start}.pager-link.next{align-items:flex-end;text-align:right}.pager-link.prev::before{content:"←";font-size:18px;color:var(--accent)}.pager-link.next::before{content:"→";font-size:18px;color:var(--accent)}.pager-home{background:var(--accent);color:#fff;padding:8px 16px;white-space:nowrap}.pager-placeholder{min-height:58px}
.module-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.module-links a{background:var(--accent);color:#fff;text-decoration:none;border-radius:999px;padding:8px 14px;font-weight:800}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px}.vocab-card{background:var(--warm);border:1px solid var(--border);border-radius:12px;padding:16px;text-align:center}.vocab-card h2{font-size:34px;margin:4px 0}.pinyin{color:var(--accent);font-weight:800}.muted{color:var(--muted)}.example{border-top:1px dashed var(--border);padding-top:10px;margin-top:10px;display:grid;gap:2px}.example em,.example-list em{color:var(--muted)}.formula{background:#fff7ed;border:1px dashed var(--accent2);border-radius:10px;padding:12px 14px;font-weight:900;margin:12px 0}table{width:100%;border-collapse:collapse}th{text-align:left;color:#9a3412;background:#fff7ed}th,td{border-bottom:1px solid var(--border);padding:8px;vertical-align:top}.answer{font-weight:800;color:var(--accent)}
.pos{color:#fff;border:0}.pos.n{background:var(--accent2)}.pos.v{background:var(--accent)}.pos.adj{background:#d97706}.pos.adv{background:var(--teal)}.pos.conj{background:#7b5ea7}.pos.num{background:var(--blue)}.pos.mw{background:var(--gold)}.pos.pron{background:var(--blue)}.pos.phrase{background:var(--rose)}
.pos-summary{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-top:14px}.pos-summary-item{background:#fff7ed;border:1px solid var(--border);border-radius:12px;padding:12px;display:grid;gap:4px}.pos-summary-item span{font-weight:900;color:#9a3412}.pos-summary-item strong{font-size:26px;color:var(--accent)}.pos-summary-item small{color:var(--muted)}
.task-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px}.task-card{background:#fff7ed;border:1px solid var(--border);border-radius:12px;padding:14px}.task-card strong{color:var(--accent)}.task-card p{margin:6px 0 0;color:var(--muted)}
.collocation-stack{display:grid;gap:6px}.collocation-stack span{display:block}.collocation-stack.examples span{color:var(--ink)}
.reading-card-head{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}.reading-chip{font-size:12px;font-weight:900;color:var(--accent);background:#fff7ed;border:1px solid var(--border);border-radius:999px;padding:4px 10px}.reading-body{font-size:18px;text-align:justify}.reading-body p{margin:0 0 14px}.prose-card{position:relative;overflow:hidden}.prose-card::before{content:"";position:absolute;inset:0 0 auto;height:5px;background:linear-gradient(90deg,var(--accent),#facc15,var(--green));}.prose-card h2{font-size:26px;margin:12px 0}.prose-card.short{background:linear-gradient(135deg,#fff 0%,#fff7ed 100%)}.feature-reading{padding:0;background:linear-gradient(135deg,#fff 0%,#fffaf5 58%,#fff2df 100%)}.reading-feature-layout{display:grid;grid-template-columns:minmax(220px,280px) 1fr;gap:0}.reading-aside{background:linear-gradient(160deg,#fff7ed 0%,#ffedd5 100%);border-right:1px solid var(--border);padding:24px;display:flex;flex-direction:column;gap:14px}.reading-aside h2{font-size:30px;line-height:1.18;margin:0}.reading-aside p{color:var(--muted);margin:0}.keyword-cloud{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto}.keyword-cloud span{background:#fff;border:1px solid var(--border);border-radius:999px;color:#9a3412;font-weight:900;padding:5px 10px}.reading-content{padding:24px 26px}.prose-card.main .reading-body{font-size:19px;line-height:1.95}.prose-card.main .reading-body p:first-child::first-letter{font-size:42px;line-height:.9;color:var(--accent);font-weight:900;float:left;margin:10px 8px 0 0}.reading-task-strip{display:flex;flex-wrap:wrap;gap:10px;align-items:center;background:#fff7ed;border:1px solid var(--border);border-radius:12px;padding:12px;margin-top:18px}.reading-task-strip strong{color:var(--accent)}.reading-task-strip span{background:#fff;border:1px solid var(--border);border-radius:999px;padding:5px 10px;color:var(--muted);font-weight:800}.dialogue-stack{display:grid;gap:12px;margin-top:14px}.dialogue-line{display:grid;grid-template-columns:86px 1fr;gap:12px;align-items:start;background:#fff7ed;border:1px solid var(--border);border-radius:12px;padding:14px}.dialogue-line strong{color:var(--accent)}.dialogue-line p{margin:0;font-weight:800;font-size:17px}.translation-stack{display:grid;gap:12px}.translation-line{background:#fff7ed;border:1px solid var(--border);border-radius:12px;padding:14px}.translation-line strong{color:var(--accent)}.translation-line p{margin:4px 0;font-weight:800}.translation-line em,.translation-note{display:block;color:var(--muted);font-style:italic}.translation-source{border-left:4px solid var(--accent);padding-left:12px;color:var(--ink);font-weight:700}
.exam-section{background:#fff;border:1px solid var(--border);border-radius:14px;box-shadow:0 10px 28px rgba(194,65,12,.08);padding:22px;margin-bottom:20px}.exam-section-head h2{margin:8px 0 4px}.word-bank,.exam-options,.scramble-words{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}.word-bank span,.exam-options span,.scramble-words span{background:#fff7ed;border:1px solid var(--border);border-radius:999px;padding:6px 12px;font-weight:800}.exam-list{display:grid;gap:12px;padding-left:22px}.exam-list li,.exam-item{background:#fff7ed;border:1px solid var(--border);border-radius:12px;padding:14px;margin:12px 0}.exam-item h3{margin:0 0 8px;color:var(--accent)}.order-grid{display:grid;gap:8px}.order-part{background:#fff;border:1px solid var(--border);border-radius:10px;padding:10px 12px}.exam-passage{font-size:17px;color:var(--ink)}.exam-question{font-weight:900;color:var(--ink)}.answer-details{margin-top:10px}.answer-details summary{cursor:pointer;color:var(--accent);font-weight:900}.writing-line{height:42px;border-bottom:2px solid var(--border);margin-top:12px}.long-writing-box{min-height:160px;border:1px dashed var(--border);border-radius:12px;background:#fff;margin:12px 0}
.interactive-hero{background:linear-gradient(135deg,#fff 0%,#fff7ed 55%,#ffedd5 100%);position:relative;overflow:hidden}.interactive-hero::after{content:"";position:absolute;right:-42px;top:-42px;width:150px;height:150px;border-radius:999px;border:26px solid rgba(249,115,22,.12)}.interactive-hero h2{font-size:30px;margin:8px 0}.interactive-head{display:grid;gap:4px;margin-bottom:14px}.interactive-head h2{margin:4px 0 0}.interactive-head p{margin:0;color:var(--muted)}.interactive-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px}.interactive-card{background:#fff7ed;border:1px solid var(--border);border-radius:14px;padding:16px;box-shadow:0 8px 18px rgba(194,65,12,.06)}.interactive-card h3{margin:6px 0;color:var(--accent)}.interactive-card p{margin:6px 0}.interactive-card small{display:block;color:var(--muted);font-weight:700}.step-badge{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;font-weight:900}.keyword-board{display:flex;flex-wrap:wrap;gap:10px;margin:12px 0}.keyword-token{border:1px solid var(--border);border-radius:999px;background:#fff;color:var(--ink);font-weight:900;padding:8px 13px;cursor:pointer}.category-lanes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.category-lanes div{min-height:78px;background:#fff;border:1px dashed var(--border);border-radius:12px;padding:12px;color:var(--muted)}.choice-stack{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin:12px 0}.choice-stack label{background:#fff;border:1px solid var(--border);border-radius:12px;padding:10px;font-weight:800}.map-stack{display:grid;gap:10px}.map-line{display:grid;grid-template-columns:34px 80px 1fr;gap:10px;align-items:start;background:#fff7ed;border:1px solid var(--border);border-radius:12px;padding:12px}.map-line span{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--accent);color:#fff;font-weight:900}.map-line strong{color:var(--accent)}.map-line p{margin:0;font-weight:800}.output-panel{background:linear-gradient(135deg,#fff 0%,#fffaf5 100%)}
@media(max-width:760px){.reading-feature-layout{grid-template-columns:1fr}.reading-aside{border-right:0;border-bottom:1px solid var(--border)}.category-lanes{grid-template-columns:1fr}.map-line{grid-template-columns:1fr}}
@media(max-width:640px){.topbar{align-items:flex-start;flex-wrap:wrap}.logo{width:116px}.hero h2{font-size:24px}.lesson-jump-nav{gap:8px;padding:10px}.lesson-jump-nav a{min-height:38px;padding:7px 12px;font-size:14px}.lesson-module-switcher{gap:8px;padding:10px}.lesson-module-switcher a{font-size:14px;padding:7px 8px}.module-bottom-pager{grid-template-columns:1fr;padding:10px}.pager-link.prev,.pager-link.next{align-items:center;text-align:center}.pager-placeholder{display:none}.dialogue-line{grid-template-columns:1fr}.reading-body{font-size:16px}.reading-content,.reading-aside{padding:18px}.prose-card.main .reading-body{font-size:17px}table{font-size:13px}}