/* Learn pages: Home, Lesson, Reading (design canvas "1 · Learn"). Generic helpers at the top are also used by Review. */
.muted{color:var(--muted)}
.eyebrow{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.back{display:inline-flex;align-items:center;min-height:44px;text-decoration:none;color:var(--muted)}
.stack{display:flex;flex-direction:column;gap:10px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.sec{margin-top:var(--gap);scroll-margin-top:120px}
.sec h2{margin:0 0 14px;font-size:22px}
.sec-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.sec-head a{display:inline-flex;align-items:center;justify-content:flex-end;min-height:44px;min-width:44px}
.btn{min-height:44px;padding:0 16px;border-radius:var(--r-s);border:1px solid var(--line);background:var(--card);font:inherit;cursor:pointer}
.btn:hover{border-color:var(--ink)}
.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.stat-grid>*{min-width:0}
.plain{text-decoration:none;color:inherit;display:block}
@media (min-width:761px){.stat-grid{grid-template-columns:repeat(4,1fr)}}

/* ---- Canvas page wrapper (.lp): the board's <main class="wrap"> padding, 40/40/72 desktop, 24/20/40 phone ---- */
.page:has(>.lp){padding:24px var(--pad) 40px}
@media (min-width:761px){.page:has(>.lp){padding:40px var(--pad) 72px}}
.lp{font-family:var(--font-ui);color:var(--ink);line-height:normal}
.lp h1,.lp h2,.lp h3,.lp p{margin:0}
.lp .zh-sub{font-family:var(--font-zh);font-weight:500;color:var(--muted)}
.lp .muted{color:var(--muted)}
.lp .card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(260px,100%),1fr));gap:12px;margin:0}
.lp .pill-btn{min-height:44px;padding:0 16px;border:0;border-radius:999px;background:var(--red);color:var(--on-red);font:600 14px var(--font-ui);display:inline-flex;align-items:center;gap:6px;cursor:pointer;text-decoration:none}
.lp .pill-btn:hover{background:var(--red-d);color:var(--on-red)}

/* ---- Home (Main.dc.html) ---- */
.home{display:flex;flex-direction:column;gap:44px}
.home-top{display:flex;flex-wrap:wrap;gap:16px}
.continue{flex:999 1 520px;min-width:0;text-decoration:none;color:var(--ink);background:var(--red-t);border-radius:20px;padding:24px;display:flex;flex-direction:column;gap:28px}
.continue:hover{color:var(--ink)}
.ct-eyebrow{font-size:13px;font-weight:600;letter-spacing:.1em;color:var(--red)}
.ct-main{display:flex;align-items:center;gap:18px}
.ct-glyph{width:72px;height:72px;flex-shrink:0;border-radius:18px;background:var(--green-s);color:var(--green-d);display:flex;align-items:center;justify-content:center;font-family:var(--font-zh);font-size:38px;font-weight:700}
.ct-text{display:flex;flex-direction:column;gap:4px;min-width:0}
.ct-title{font-family:var(--font-zh);font-size:32px;font-weight:700}
.ct-sub{font-size:16px;color:var(--text-2)}
.ct-prog{display:flex;flex-direction:column;gap:6px}
.ct-bar{display:block;height:8px;border-radius:999px;background:var(--wg-cross);overflow:hidden}
.ct-bar i{display:block;height:100%;background:var(--red)}
.ct-steps{font-size:13px;color:var(--text-2)}
.ct-btn{align-self:flex-start;height:48px;padding:0 22px;border-radius:12px;background:var(--red);color:var(--on-red);font-weight:600;font-size:16px;display:flex;align-items:center}
.continue:hover .ct-btn{background:var(--red-d)}
.today{flex:1 1 min(320px,100%);min-width:0;background:var(--card);border-radius:20px;padding:20px;display:flex;flex-direction:column;gap:14px;box-sizing:border-box}
.today h2{font-size:18px;font-weight:700}
.hubs{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr));gap:12px}
.hub{text-decoration:none;color:inherit;background:var(--card);border-radius:16px;padding:18px;display:flex;flex-direction:column;gap:6px;border:1px solid var(--line)}
.hub:hover{color:inherit;border-color:var(--muted)}
.hub b{font-size:16px}.hub-sub{font-size:14px;color:var(--muted)}
.hub-g{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-family:var(--font-zh);font-weight:700;font-size:20px}
.hub-learn{background:var(--orange-t);color:var(--orange)}.hub-practice{background:var(--red-t);color:var(--red-d)}
.hub-review{background:var(--green-t);color:var(--green-d)}.hub-print{background:var(--blue-t);color:var(--blue)}
.sec-col{display:flex;flex-direction:column;gap:14px}
.sec-col.explore{gap:12px}
.sec-row{display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.sec-row.wrap{flex-wrap:wrap}
.h2-l{font-size:22px;font-weight:700}
.sec-meta{font-size:14px;color:var(--muted)}
.explore-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(260px,100%),1fr));gap:8px}
.path{background:var(--card);border-radius:20px;padding:20px;display:flex;flex-direction:column;gap:14px}
.path h2{font-size:20px;font-weight:700}
.path-all{font-size:14px;font-weight:600;color:var(--red);min-height:44px;display:inline-flex;align-items:center}
.path-all:hover{color:var(--red-d)}
.path-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(128px,100%),1fr));gap:10px}
.path-card{text-decoration:none;color:inherit;border:1px solid var(--line);border-radius:14px;padding:12px;display:flex;flex-direction:column;gap:8px}
.path-card:hover{color:inherit;border-color:var(--muted)}
.path-top{display:flex;justify-content:space-between;align-items:baseline;gap:6px}.path-top b{font-size:16px;white-space:nowrap}
.path-words{font-size:12px;color:var(--muted);white-space:nowrap}
.path-bar{display:block;height:6px;border-radius:999px;background:var(--soft);overflow:hidden}
.path-bar i{display:block;height:100%;background:var(--green)}
.path-known{font-size:12px;color:var(--muted)}
.empty-note{font-size:14px}
@media (max-width:760px){.ct-title{font-size:26px}}

/* ---- Lesson (Lesson.dc.html) ---- */
body:has(.lesson-hero){overflow-x:clip}
.page:has(>.lesson-hero){padding-top:0}
.lesson-hero{background:var(--green-s);padding:28px 32px;margin:0 calc(50% - 50vw) 40px}
.lh-in{max-width:1136px;margin:0 auto;display:flex;flex-wrap:wrap;gap:16px;align-items:flex-end;justify-content:space-between}
.lh-text{display:flex;flex-direction:column;gap:6px;min-width:0}
.lh-back{font-size:13px;font-weight:600;color:var(--green-d);text-decoration:none;min-height:44px;display:inline-flex;align-items:center;align-self:flex-start;margin:-12px 0 -12px}
.lh-back:hover{color:var(--green-d);text-decoration:underline}
.lh-eyebrow{font-size:12px;font-weight:600;letter-spacing:.1em;color:var(--green-d)}
.lesson-hero h1{font-family:var(--font-zh);font-size:40px;font-weight:700;margin:0;line-height:normal}
.lh-desc{margin:0;font-size:16px;color:var(--green-d)}
.lh-chips{display:flex;gap:8px;flex-wrap:wrap}
.lh-chip{font-size:13px;font-weight:600;background:var(--card);color:var(--ink);border-radius:999px;padding:6px 12px}
.lesson{display:flex;flex-wrap:wrap;gap:32px;align-items:flex-start}
.secnav{flex:0 0 200px;display:flex;flex-direction:column;gap:4px;position:sticky;top:84px}
.secnav a{text-decoration:none;min-height:44px;padding:0 12px;border-radius:10px;display:flex;align-items:center;gap:10px;color:var(--ink);font-size:15px;font-weight:500}
.secnav a:hover{background:var(--card);color:var(--ink)}
.secnav a.is-now{background:var(--card);font-weight:600}
.sn-dot{width:20px;height:20px;flex-shrink:0;border-radius:999px;font-size:11px;display:flex;align-items:center;justify-content:center;background:var(--line);color:var(--on-red)}
.is-now .sn-dot{background:var(--red)}
.is-now .sn-dot::before{content:'';width:6px;height:6px;border-radius:999px;background:var(--on-red)}
.lesson-main{flex:999 1 480px;min-width:0;display:flex;flex-direction:column;gap:24px}
.lsec{display:flex;flex-direction:column;gap:12px;scroll-margin-top:96px}
.lsec h2{font-size:20px;font-weight:700}
.lsec-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.lsec-head.c{align-items:center}
.lsec-note{font-size:13px;color:var(--muted)}
.vocab-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(104px,100%),1fr));gap:8px}
#vocab .dot-new{background:transparent}
.vocab-foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:4px 12px}
.legend{font-size:12px;color:var(--muted)}
.link-btn{min-height:44px;padding:0;border:0;background:none;font:600 13px var(--font-ui);color:var(--red);cursor:pointer;text-decoration:underline}
.link-btn:hover{color:var(--red-d)}
.gram-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(280px,100%),1fr));gap:12px}
.gram{background:var(--card);border-radius:14px;padding:16px;display:flex;flex-direction:column;gap:10px}
.gram-t{font-size:15px;font-weight:600}
.gram-p{background:var(--gold-s);border-radius:10px;padding:12px 14px;font-family:var(--font-zh);font-size:20px}
.gram-p .ruby-line{margin:0}.gram-p .rl-text{font-size:calc(20px*var(--cs,1))}
.gram-p .ph{font-family:var(--font-ui);font-size:15px;color:var(--gold);padding:0 2px}
.gram-n{font-size:14px;line-height:1.5;color:var(--text-2)}
.bubbles{display:flex;flex-direction:column;gap:12px}
.read-row{text-decoration:none;color:inherit;background:var(--card);border-radius:14px;padding:14px 16px;display:flex;align-items:center;gap:12px}
.read-row:hover{color:inherit;box-shadow:0 0 0 1px var(--line)}
.read-g{width:44px;height:44px;flex-shrink:0;border-radius:12px;background:var(--green-t);color:var(--green-d);font-family:var(--font-zh);font-size:20px;font-weight:700;display:flex;align-items:center;justify-content:center}
.read-t{flex:1;min-width:0;display:flex;flex-direction:column}
.read-t b{font-family:var(--font-zh);font-size:17px}.read-t span{font-size:13px;color:var(--text-2)}
.read-cta{font-size:14px;font-weight:600;color:var(--red);white-space:nowrap}
.lesson-content{background:var(--card);border-radius:14px;padding:16px;line-height:1.6;color:var(--text-2);overflow-wrap:anywhere}
.practice-panel{flex:1 1 min(280px,100%);min-width:0;box-sizing:border-box;background:var(--red-t);color:var(--ink);border-radius:22px;padding:24px;display:flex;flex-direction:column;gap:10px;scroll-margin-top:96px}
.practice-panel h2{font-size:18px;font-weight:700}
.practice-panel p{font-size:14px;color:var(--muted)}
@media (max-width:760px){
  .lesson-hero{padding:20px 16px;margin-bottom:24px}
  .lesson-hero h1{font-size:28px}
  .secnav{flex:1 0 100%;flex-direction:row;overflow-x:auto;scrollbar-width:none;top:var(--hdr-h,112px);z-index:2;background:var(--paper)}
  .secnav a{flex-shrink:0;white-space:nowrap}
}

/* ---- Reading (Reading.dc.html) ---- */
.reading{display:flex;flex-direction:column;gap:28px}
.rd-head{display:flex;flex-direction:column;gap:6px}
.rd-back{font-size:13px;font-weight:600;text-decoration:none;color:var(--red);min-height:44px;display:inline-flex;align-items:center;align-self:flex-start;margin:-12px 0 -6px}
.rd-back:hover{color:var(--red-d)}
.rd-tags{display:flex;gap:6px;flex-wrap:wrap}
.rd-tag{font-size:12px;font-weight:600;border-radius:999px;padding:4px 10px}
.rd-type{color:var(--on-red);background:var(--red)}.rd-diff{color:var(--green-d);background:var(--green-t)}.rd-known{color:var(--text-2);background:var(--soft)}
.rd-head h1{font-family:var(--font-zh);font-size:34px;font-weight:700;line-height:normal}
.rd-head p{font-size:16px;color:var(--text-2)}
.rd-body{display:flex;flex-wrap:wrap;gap:32px;align-items:flex-start}
.rd-text{flex:999 1 520px;min-width:0;display:flex;flex-direction:column;gap:12px}
.rd-toggles{display:flex;gap:8px;flex-wrap:wrap}
.tg-btn{height:44px;padding:0 14px;border-radius:10px;border:1.5px solid var(--line);background:var(--card);font:600 14px var(--font-ui);color:var(--ink);cursor:pointer}
.tg-btn[aria-pressed=true]{background:var(--soft)}
.rd-toggles .pill-btn{border-radius:10px}
.rd-lines{background:var(--card);border-radius:18px;padding:8px 18px}
.rd-line{padding:14px 0;border-top:1px solid var(--soft);display:flex;gap:12px;align-items:center}
.rd-line:first-child{border-top:0}
.rd-n{font-size:12px;color:var(--text-2);width:16px;flex-shrink:0}
.rd-l{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}
.rd-l .ruby-line{margin:0}
.rd-l .rl-text{font-size:calc(22px*var(--cs,1));line-height:1.5}
.rd-py{font-size:13px;color:var(--tone3)}
.rd-en{font-size:14px;color:var(--text-2)}
.rd-play{width:44px;height:44px;flex-shrink:0;border:0;border-radius:999px;background:var(--soft);color:var(--ink);display:flex;align-items:center;justify-content:center;cursor:pointer}
.rd-play:hover{background:var(--line)}
.hide-py .rd-py,.hide-py .ruby-line rt{display:none}.hide-en .rd-en{display:none}
.rd-hint{font-size:13px;color:var(--text-2)}
.quiz{flex:1 1 min(320px,100%);min-width:0;box-sizing:border-box;background:var(--card);border-radius:22px;padding:24px;display:flex;flex-direction:column;gap:12px}
.quiz-head{display:flex;justify-content:space-between;align-items:baseline}
.quiz h2{font-size:18px;font-weight:700}
.quiz-count{font-size:13px;color:var(--text-2)}
.quiz-bar{display:block;height:6px;border-radius:999px;background:var(--line);overflow:hidden}
.quiz-bar i{display:block;height:100%;background:var(--red);transition:width .2s}
.question{border:0;margin:0;padding:0;display:flex;flex-direction:column;gap:8px;min-width:0}
.question[hidden]{display:none}
.question legend{padding:0 0 8px;display:flex;flex-direction:column}
.q-zh{font-family:var(--font-zh);font-size:20px;font-weight:700}
.q-en{font-size:14px;color:var(--text-2)}
.feedback{margin:0;font-size:14px;border-radius:10px;padding:10px 12px}
.feedback:empty{display:none}
.feedback.ok{background:var(--green-t);color:var(--green-d)}.feedback.no{background:var(--red-t);color:var(--red-d)}
.quiz-next{height:52px;border:0;border-radius:12px;background:var(--red);color:var(--on-red);font:600 16px var(--font-ui);cursor:pointer}
.quiz-next:hover{background:var(--red-d)}
.quiz-next:disabled{opacity:.55;cursor:default}
.score{padding:14px 18px;background:var(--green-t);color:var(--green-d);border-radius:14px;font-weight:600}
.rd-nextread{align-self:flex-start}

/* ---- Courses: Textbooks import (F1) ---- */
.tb{display:flex;flex-direction:column;gap:16px}.tb code{font-size:.9em}
.tb-import{display:grid;gap:8px;padding:16px;border-radius:16px;background:var(--card);scroll-margin-top:96px}
.tb-label{font-weight:600;font-size:14px}.tb-input{width:100%;box-sizing:border-box;min-height:44px;padding:10px 12px;border:1.5px solid var(--line);border-radius:var(--r-s);background:var(--card);color:var(--ink);font:inherit}
.tb-text{min-height:132px;resize:vertical}.tb-actions{display:flex;flex-wrap:wrap;gap:8px}.tb-file{cursor:pointer}
.tb-list{margin:0;padding:14px;border-radius:16px;background:var(--card)}
.tb-lists{display:flex;flex-direction:column;gap:12px}
.tb-lists:empty{display:none}
.tb-head{display:flex;justify-content:space-between;align-items:baseline;gap:8px}.tb-head h2{margin:0;font-size:18px;overflow-wrap:anywhere}
.tb-list .tb-actions{margin:10px 0}.tb-words summary{min-height:44px;display:flex;align-items:center;cursor:pointer}