:root{
  --bg:#f4f2fb;
  --page:#fbfaff;
  --card:#ffffff;
  --line:#ece9f6;
  --line2:#e3def2;
  --ink:#2f2b62;          /* deep indigo headings */
  --ink-soft:#4a4778;
  --txt:#6c6a89;          /* body grey-violet */
  --txt-dim:#9a98b4;
  --txt-faint:#b3b1c9;
  --accent:#ec5b97;       /* pink */
  --accent2:#8b6df0;      /* purple */
  --violet:#7a6ff0;
  --good:#3ec79a;
  --bad:#ef6079;
  --grad-side:linear-gradient(165deg,#f2a3b9 0%,#d49bd0 46%,#a6a8ec 100%);
  --grad-accent:linear-gradient(135deg,#f178a6,#9a78f0);
  --radius:22px;
  --shadow:0 14px 40px rgba(108,82,180,.10);
  --shadow-sm:0 6px 20px rgba(108,82,180,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--txt);
  font-family:'Poppins',system-ui,-apple-system,sans-serif;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:'Poppins',sans-serif;font-weight:700;line-height:1.2;margin:0;color:var(--ink)}

/* ---------- Layout ---------- */
.layout{display:flex;min-height:100vh;padding:18px;gap:0}
.sidebar{
  width:248px;flex:none;background:var(--grad-side);
  border-radius:28px;padding:30px 20px;color:#fff;
  display:flex;flex-direction:column;gap:26px;position:sticky;top:18px;height:calc(100vh - 36px);
  box-shadow:0 18px 50px rgba(180,120,170,.28);
}
.content{flex:1;min-width:0;padding:6px 4px 0 28px;display:flex;flex-direction:column}

/* ---------- Brand ---------- */
.brand{display:flex;align-items:center;gap:12px;cursor:pointer;padding:4px 8px}
.brand-mark{width:38px;height:38px;border-radius:12px;background:rgba(255,255,255,.25);display:grid;place-items:center;font-size:18px;color:#fff;backdrop-filter:blur(4px)}
.brand-text{font-weight:700;font-size:19px;letter-spacing:.2px;line-height:1.1}

/* ---------- Sidebar nav ---------- */
.mainnav{display:flex;flex-direction:column;gap:6px;margin-top:4px}
.navbtn{
  display:flex;align-items:center;gap:14px;width:100%;
  background:none;border:none;color:rgba(255,255,255,.82);
  font-family:inherit;font-size:15px;font-weight:500;
  padding:13px 16px;border-radius:14px;cursor:pointer;transition:.18s;text-align:left;
}
.navbtn svg{width:21px;height:21px;flex:none;opacity:.9}
.navbtn:hover{background:rgba(255,255,255,.14);color:#fff}
.navbtn.active{background:rgba(255,255,255,.95);color:var(--accent);font-weight:600;box-shadow:0 8px 20px rgba(150,90,150,.22)}
.navbtn.active svg{opacity:1}

/* ---------- Sidebar promo ---------- */
.promo{margin-top:auto;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.25);border-radius:20px;padding:22px 18px;text-align:center;backdrop-filter:blur(6px)}
.promo-icon{font-size:30px;margin-bottom:8px}
.promo-title{font-weight:700;font-size:15px;line-height:1.25;margin-bottom:4px}
.promo-sub{font-size:12.5px;color:rgba(255,255,255,.85)}

/* ---------- Topbar ---------- */
.topbar{display:flex;align-items:center;gap:18px;margin-bottom:26px;padding:4px 2px}
.pagetitle{font-family:'Poppins';font-weight:700;font-size:28px;color:var(--ink)}
.topright{margin-left:auto;display:flex;align-items:center;gap:14px}
.profile{display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--line);border-radius:99px;padding:6px 16px 6px 6px;box-shadow:var(--shadow-sm)}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--grad-accent);color:#fff;display:grid;place-items:center;font-weight:700;font-size:15px}
.profile-name{font-weight:600;font-size:14.5px;color:var(--ink-soft)}
.menu-toggle{display:none;background:var(--card);border:1px solid var(--line);color:var(--ink);font-size:20px;cursor:pointer;border-radius:12px;width:42px;height:42px}

main#view{flex:1}
.appfoot{margin-top:40px;padding:20px 2px;color:var(--txt-faint);font-size:13px;text-align:center;border-top:1px solid var(--line)}

/* ---------- Generic ---------- */
.eyebrow{text-transform:uppercase;letter-spacing:.16em;font-size:12px;font-weight:700;color:var(--accent)}
.muted{color:var(--txt)}
.faint{color:var(--txt-faint)}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--grad-accent);color:#fff;border:none;
  font-family:inherit;font-weight:600;font-size:15px;
  padding:12px 22px;border-radius:13px;cursor:pointer;transition:.16s;
  box-shadow:0 10px 24px rgba(180,90,160,.22);
}
.btn:hover{filter:brightness(1.04);transform:translateY(-1px);box-shadow:0 14px 28px rgba(180,90,160,.28)}
.btn.ghost{background:var(--card);color:var(--ink-soft);border:1px solid var(--line2);box-shadow:var(--shadow-sm)}
.btn.ghost:hover{background:#faf8ff;color:var(--ink)}
.btn.sm{padding:9px 16px;font-size:13.5px}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}

/* ---------- Hero ---------- */
.hero{
  background:linear-gradient(120deg,#fbe6ee 0%,#ede6fb 55%,#e4ecfd 100%);
  border:1px solid var(--line);border-radius:26px;
  padding:42px 40px;margin-bottom:30px;position:relative;overflow:hidden;
}
.hero::after{content:"";position:absolute;right:-60px;top:-60px;width:240px;height:240px;border-radius:50%;background:radial-gradient(circle,rgba(236,91,151,.18),transparent 70%)}
.hero h1{font-size:clamp(28px,4vw,42px);margin:12px 0 12px;max-width:20ch;color:var(--ink)}
.hero p.sub{font-size:17px;color:var(--ink-soft);max-width:62ch;margin:0 0 24px}
.hero .row{position:relative;z-index:2}
.bigidea{margin-top:26px;padding:20px 24px;border-left:4px solid var(--accent);background:rgba(255,255,255,.6);border-radius:0 14px 14px 0;color:var(--ink-soft);font-size:15px}

.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin:6px 0 20px;flex-wrap:wrap}
.section-head h2{font-size:24px;color:var(--ink)}

/* ---------- Principle / course cards ---------- */
.pgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:22px}
.pcard{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  cursor:pointer;transition:.2s;overflow:hidden;display:flex;flex-direction:column;
  box-shadow:var(--shadow-sm);
}
.pcard:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.pc-thumb{height:120px;display:grid;place-items:center;position:relative;overflow:hidden}
.pc-thumb .pc-emoji{font-size:46px;filter:drop-shadow(0 6px 10px rgba(0,0,0,.12))}
.pc-thumb .pc-tag{position:absolute;top:12px;left:14px;font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.95);background:rgba(0,0,0,.12);padding:4px 10px;border-radius:99px}
.pc-body{padding:16px 20px 20px}
.pc-num{font-size:11.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--txt-faint)}
.pcard h3{font-size:19px;margin:3px 0 2px;color:var(--ink)}
.pc-sub{color:var(--txt);font-size:13.5px}
.pc-bar{height:7px;border-radius:99px;background:#f0edf8;margin-top:14px;overflow:hidden}
.pc-bar>i{display:block;height:100%;border-radius:99px;width:0;transition:.6s}
.pc-prog-label{font-size:11.5px;color:var(--txt-faint);margin-top:7px;display:flex;justify-content:space-between}
.pc-prog-label .done{color:var(--good);font-weight:600}

/* ---------- Stat strip ---------- */
.statstrip{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:18px;margin:28px 0}
.stat{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:20px 22px;box-shadow:var(--shadow-sm)}
.stat .big{font-weight:700;font-size:30px;color:var(--accent)}
.stat .lbl{font-size:13px;color:var(--txt);margin-top:2px}

/* ---------- Learn detail ---------- */
.backlink{background:none;border:none;color:var(--txt-dim);font-family:inherit;font-size:14px;cursor:pointer;padding:6px 0;margin-bottom:14px;font-weight:500}
.backlink:hover{color:var(--accent)}
.pc-badge{display:grid;place-items:center;color:#fff;border-radius:12px;font-size:18px}
.detail-hero{display:flex;gap:18px;align-items:center;margin-bottom:8px}
.detail-hero .pc-badge{width:60px;height:60px;font-size:28px;border-radius:18px;display:grid;place-items:center;color:#fff;box-shadow:0 10px 24px rgba(0,0,0,.14)}
.detail-hero .pc-num{color:var(--txt-faint)}
.detail-hero h1{font-size:30px;color:var(--ink)}
.lead{font-size:16.5px;color:var(--ink-soft);background:var(--card);border:1px solid var(--line);border-left-width:4px;border-radius:0 16px 16px 0;padding:20px 24px;margin:22px 0 8px;box-shadow:var(--shadow-sm)}

.subtabs{display:flex;gap:8px;margin:26px 0 22px;flex-wrap:wrap}
.subtab{background:var(--card);border:1px solid var(--line);color:var(--txt);font-family:inherit;font-size:14px;font-weight:500;padding:9px 18px;cursor:pointer;border-radius:99px;box-shadow:var(--shadow-sm)}
.subtab:hover{color:var(--ink)}
.subtab.active{background:var(--grad-accent);color:#fff;border-color:transparent;font-weight:600}

.concept{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px 20px;margin-bottom:12px;box-shadow:var(--shadow-sm)}
.concept .term{font-weight:600;font-size:16px;color:var(--ink)}
.concept .def{color:var(--txt);margin-top:4px;font-size:14.5px}

.step{display:flex;gap:16px;margin-bottom:14px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px 22px;box-shadow:var(--shadow-sm)}
.step .num{font-weight:700;font-size:26px;flex:none;width:36px}
.step h4{margin:0 0 4px;font-size:16.5px;color:var(--ink)}
.step p{margin:0;color:var(--txt);font-size:14.5px}

ul.tactics{list-style:none;padding:0;margin:0;display:grid;gap:11px}
ul.tactics li{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 18px 14px 48px;position:relative;font-size:14.5px;box-shadow:var(--shadow-sm);color:var(--ink-soft)}
ul.tactics li::before{content:"✓";position:absolute;left:18px;top:13px;color:#fff;background:var(--good);width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:700}

.quotebox{border-left:4px solid var(--accent);padding:10px 20px;margin:14px 0;color:var(--ink-soft);font-style:italic;font-size:15.5px;background:var(--card);border-radius:0 14px 14px 0;box-shadow:var(--shadow-sm)}

.detail-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px;padding-top:24px;border-top:1px solid var(--line)}

/* ---------- Reader ---------- */
.reader-layout{display:grid;grid-template-columns:248px 1fr;gap:34px}
.toc{position:sticky;top:18px;align-self:start;max-height:calc(100vh - 60px);overflow:auto;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:18px;box-shadow:var(--shadow-sm)}
.toc h4{font-size:12px;text-transform:uppercase;letter-spacing:.14em;color:var(--txt-faint);margin-bottom:12px}
.toc a{display:block;padding:9px 14px;border-radius:11px;color:var(--txt);font-size:13.5px;cursor:pointer;text-decoration:none;font-weight:500;transition:.14s}
.toc a:hover{background:#f7f4ff;color:var(--ink)}
.toc a.active{color:#fff;background:var(--grad-accent);font-weight:600}
.reader{max-width:680px;background:var(--card);border:1px solid var(--line);border-radius:24px;padding:40px 46px;box-shadow:var(--shadow-sm)}
.reader .chap-head{margin-bottom:26px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.reader .chap-head .eyebrow{margin-bottom:8px;display:block}
.reader h1{font-size:28px;margin-bottom:6px;color:var(--ink)}
.reader .chap-sub{color:var(--txt);font-size:17px}
.reader p{font-size:16.5px;line-height:1.8;margin:0 0 18px;color:#54526f}
.reader p.dropcap::first-letter{font-weight:700;font-size:52px;float:left;line-height:.85;padding:4px 12px 0 0;color:var(--accent)}
.reader p.heading{font-weight:700;font-size:19px;color:var(--ink);margin-top:28px}
.reader-nav{display:flex;justify-content:space-between;gap:12px;margin-top:40px;padding-top:24px;border-top:1px solid var(--line);flex-wrap:wrap}
.readbar{position:fixed;left:0;top:0;height:4px;background:var(--grad-accent);width:0;z-index:80;transition:width .1s}

/* ---------- Audiobook toolbar ---------- */
.audiobar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;background:linear-gradient(135deg,#fceef5,#efe9fd);border:1px solid var(--line);border-radius:16px;padding:10px 12px;margin-bottom:26px;position:sticky;top:8px;z-index:7;box-shadow:var(--shadow-sm)}
.ab-btn{border:none;background:#fff;color:var(--accent);min-width:40px;height:40px;border-radius:11px;cursor:pointer;font-size:15px;display:inline-flex;align-items:center;justify-content:center;box-shadow:var(--shadow-sm);font-family:inherit}
.ab-btn:hover{filter:brightness(1.04);transform:translateY(-1px)}
.ab-btn.ab-play{padding:0 18px;background:var(--grad-accent);color:#fff;font-weight:600;gap:2px}
.ab-btn.ab-play .ab-label{font-size:14px}
.ab-field{font-size:12px;color:var(--txt);display:flex;align-items:center;gap:6px;white-space:nowrap}
.ab-field select{border:1px solid var(--line2);border-radius:9px;padding:6px 8px;font-family:inherit;font-size:12.5px;color:var(--ink-soft);background:#fff;cursor:pointer;max-width:150px}
.ab-auto{margin-left:auto}
.ab-auto input{accent-color:var(--accent);width:15px;height:15px}
.ab-note{font-size:13px;color:var(--txt-dim);padding:4px 6px}
.ab-help{border:1px dashed var(--accent);background:transparent;color:var(--accent);font-family:inherit;font-size:12px;font-weight:600;padding:7px 12px;border-radius:10px;cursor:pointer}
.ab-help:hover{background:rgba(236,91,151,.08)}
.ab-help-panel{display:none;flex-basis:100%;width:100%;margin-top:4px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;font-size:13px;color:var(--ink-soft);line-height:1.6}
.audiobar.help-open .ab-help-panel{display:block}
.ab-help-panel ol{margin:8px 0 0;padding-left:20px;display:grid;gap:6px}
.ab-help-panel i{color:var(--accent)}
/* While actively listening, paragraphs become tap-to-jump targets */
.reader.listening.tts-on p{cursor:pointer}
.reader.listening.tts-on p:hover{color:var(--ink)}
.reader p.speaking{background:rgba(236,91,151,.10);border-left:3px solid var(--accent);padding-left:14px;margin-left:-17px;border-radius:6px;transition:background .2s}

/* ---------- Flashcards ---------- */
.fc-wrap{max-width:640px;margin:0 auto;text-align:center}
.fc-pickers{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-bottom:24px}
.chip{background:var(--card);border:1px solid var(--line);color:var(--txt);padding:8px 16px;border-radius:99px;font-size:13.5px;cursor:pointer;font-family:inherit;font-weight:500;box-shadow:var(--shadow-sm)}
.chip.active{background:var(--grad-accent);color:#fff;border-color:transparent;font-weight:600}
.flashcard{perspective:1600px;height:330px;margin:10px 0 6px;cursor:pointer}
.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .55s;transform-style:preserve-3d}
.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}
.fc-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:24px;display:flex;flex-direction:column;justify-content:center;padding:36px;border:1px solid var(--line);background:var(--card);box-shadow:var(--shadow)}
.fc-face .fc-tag{position:absolute;top:20px;left:26px;font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--txt-faint);font-weight:700}
.fc-front{font-size:22px;color:var(--ink);font-weight:600}
.fc-back{transform:rotateY(180deg);background:linear-gradient(135deg,#fcf1f6,#f1ecfd)}
.fc-back .a{font-size:16.5px;color:var(--ink-soft);line-height:1.6}
.fc-hint{color:var(--txt-faint);font-size:13px;margin-top:14px;font-weight:500}
.fc-controls{display:flex;align-items:center;justify-content:space-between;margin-top:18px}
.fc-count{color:var(--txt);font-size:14px}
.fc-known{display:flex;gap:10px}

/* ---------- Quiz ---------- */
.quiz-wrap{max-width:680px;margin:0 auto}
.q-progress{height:8px;background:#f0edf8;border-radius:99px;overflow:hidden;margin-bottom:26px}
.q-progress>i{display:block;height:100%;background:var(--grad-accent);transition:.3s;border-radius:99px}
.qcard{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:30px;box-shadow:var(--shadow-sm)}
.qnum{font-size:13px;color:var(--accent);letter-spacing:.1em;text-transform:uppercase;font-weight:700}
.qtext{font-size:21px;margin:8px 0 22px;line-height:1.4;color:var(--ink);font-weight:600}
.opts{display:grid;gap:11px}
.opt{text-align:left;background:#faf8ff;border:1.5px solid var(--line2);color:var(--ink-soft);font-family:inherit;font-size:15px;padding:15px 18px;border-radius:14px;cursor:pointer;transition:.14s;display:flex;gap:12px;align-items:flex-start;font-weight:500}
.opt:hover:not(:disabled){border-color:var(--accent2);background:#f4f0ff}
.opt .key{font-weight:700;color:var(--txt-faint);flex:none}
.opt.correct{border-color:var(--good);background:rgba(62,199,154,.12)}
.opt.correct .key{color:var(--good)}
.opt.wrong{border-color:var(--bad);background:rgba(239,96,121,.12)}
.opt.wrong .key{color:var(--bad)}
.opt:disabled{cursor:default}
.explain{margin-top:18px;padding:16px 18px;border-radius:14px;background:#f7f4ff;border:1px solid var(--line);font-size:14.5px;color:var(--txt);display:none}
.explain.show{display:block}
.explain b{color:var(--ink)}
.quiz-foot{display:flex;justify-content:space-between;margin-top:22px;gap:12px}
.scorecard{text-align:center;background:var(--card);border:1px solid var(--line);border-radius:24px;padding:44px;box-shadow:var(--shadow)}
.score-ring{font-weight:700;font-size:56px;color:var(--accent)}
.score-msg{font-size:18px;color:var(--ink);margin:6px 0 4px;font-weight:600}

/* ---------- Progress ---------- */
.prog-overview{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:30px;margin-bottom:26px;box-shadow:var(--shadow-sm)}
.bigring{display:flex;align-items:center;gap:30px;flex-wrap:wrap}
.ring{--p:0;width:124px;height:124px;border-radius:50%;flex:none;background:conic-gradient(var(--accent) calc(var(--p)*1%),#efeafb 0);display:grid;place-items:center;position:relative}
.ring::before{content:"";position:absolute;inset:11px;background:var(--card);border-radius:50%}
.ring span{position:relative;font-weight:700;font-size:28px;color:var(--ink)}
.prog-table{width:100%;border-collapse:collapse}
.prog-table td,.prog-table th{padding:14px 12px;text-align:left;border-bottom:1px solid var(--line);font-size:14.5px}
.prog-table th{color:var(--txt-faint);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.08em}
.prog-table tbody tr:hover{background:#faf8ff}
.prog-table td b{color:var(--ink)}
.pill{display:inline-block;padding:4px 12px;border-radius:99px;font-size:12px;font-weight:600}
.pill.done{background:rgba(62,199,154,.16);color:#2aa178}
.pill.todo{background:#f0edf8;color:var(--txt-faint)}
.reset-btn{margin-top:18px}

/* ---------- Highlight marks (in reader) ---------- */
mark.hl{
  --hl:#ffd76b;
  background:var(--hl);
  background:color-mix(in srgb, var(--hl) 70%, transparent);
  color:inherit;border-radius:4px;padding:.04em .06em;
  -webkit-box-decoration-break:clone;box-decoration-break:clone;
  cursor:pointer;-webkit-tap-highlight-color:transparent;
}
mark.hl:hover{filter:brightness(.96)}

/* ---------- Selection / edit popup ---------- */
.hl-popup{
  position:absolute;z-index:200;display:flex;align-items:center;gap:8px;
  background:#2f2b62;color:#fff;border-radius:14px;padding:7px 9px;
  box-shadow:0 16px 36px rgba(40,30,80,.36);animation:hlpop .12s ease-out;
}
.hl-popup[hidden]{display:none}
@keyframes hlpop{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:none}}
.hl-act{background:rgba(255,255,255,.14);border:none;color:#fff;font-family:inherit;font-weight:600;font-size:13.5px;padding:9px 13px;border-radius:9px;cursor:pointer;white-space:nowrap}
.hl-act:hover{background:rgba(255,255,255,.24)}
.hl-act.danger{background:rgba(239,96,121,.92)}
.hl-act.danger:hover{background:rgba(239,96,121,1)}
.hl-swatches{display:flex;gap:7px}
.hl-swatch{width:26px;height:26px;border-radius:50%;border:2px solid rgba(255,255,255,.45);cursor:pointer;padding:0;transition:transform .12s}
.hl-swatch:hover{transform:scale(1.12)}
.hl-swatch.sel{border-color:#fff;box-shadow:0 0 0 2px #2f2b62,0 0 0 4px #fff}

/* ---------- Highlights view ---------- */
.hl-tools{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 26px}
.danger-text{color:var(--bad)!important}
.hl-group{margin-bottom:32px}
.hl-group-head{display:flex;align-items:flex-end;gap:14px;justify-content:space-between;margin-bottom:6px;padding-bottom:12px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.hl-group-head h3{font-size:20px;color:var(--ink)}
.hl-group-sub{display:block;font-size:13px;color:var(--txt-dim);margin-top:3px}
.hl-open{background:none;border:none;color:var(--accent);font-family:inherit;font-size:13px;font-weight:600;cursor:pointer;white-space:nowrap;padding:4px 0}
.hl-open:hover{text-decoration:underline}
.hl-sub{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--txt-faint);margin:20px 0 12px}
.hl-card{--hl:#ffd76b;background:var(--card);border:1px solid var(--line);border-left:5px solid var(--hl);border-radius:14px;padding:16px 18px;margin-bottom:12px;box-shadow:var(--shadow-sm)}
.hl-text{color:var(--ink-soft);font-size:15.5px;line-height:1.62}
.hl-note{width:100%;border:1px solid var(--line2);background:#faf8ff;border-radius:10px;padding:9px 12px;margin-top:12px;font-family:inherit;font-size:14px;color:var(--ink-soft);resize:none;overflow:hidden;line-height:1.5}
.hl-note::placeholder{color:var(--txt-faint)}
.hl-note:focus{outline:none;border-color:var(--accent2);background:#fff}
.hl-card-foot{display:flex;gap:16px;margin-top:10px}
.hl-mini{background:none;border:none;color:var(--txt-dim);font-family:inherit;font-size:12.5px;font-weight:600;cursor:pointer;padding:3px 0}
.hl-mini:hover{color:var(--ink)}
.hl-empty{text-align:center;background:var(--card);border:1px solid var(--line);border-radius:22px;padding:52px 30px;box-shadow:var(--shadow-sm);max-width:520px;margin:14px auto}
.hl-empty-icon{font-size:48px;margin-bottom:12px}
.hl-empty h3{font-size:22px;margin-bottom:10px;color:var(--ink)}
.hl-empty p{margin:0 auto 24px;max-width:44ch}

/* ---------- Mobile chrome: backdrop + bottom nav ---------- */
.sidebar-backdrop{position:fixed;inset:0;background:rgba(40,30,70,.42);z-index:96;border:0}
.sidebar-backdrop[hidden]{display:none}
.bottomnav{display:none}

@media (max-width:980px){
  .reader-layout{grid-template-columns:1fr}
  .toc{position:static;max-height:none;margin-bottom:8px}
  .toc a{display:inline-block;margin:3px}
}
@media (max-width:760px){
  .layout{padding:0}
  .sidebar{position:fixed;left:0;top:0;width:270px;max-width:84vw;height:100vh;border-radius:0 24px 24px 0;z-index:100;transform:translateX(-110%);transition:transform .25s}
  .sidebar.open{transform:translateX(0)}
  .content{padding:16px 16px 88px}
  .topbar{margin-bottom:18px;position:sticky;top:0;z-index:60;background:var(--bg);padding:10px 2px}
  .menu-toggle{display:grid;place-items:center}
  .pagetitle{font-size:22px}
  .profile{display:none}
  .hero{padding:26px 20px}
  .hero h1{font-size:26px}
  .hero p.sub{font-size:15.5px}
  .reader{padding:24px 18px;border-radius:18px}
  .reader p{font-size:16px}
  .pgrid{grid-template-columns:1fr;gap:16px}
  .statstrip{grid-template-columns:1fr 1fr;gap:12px}
  .detail-hero h1{font-size:24px}
  .audiobar{position:static;gap:7px}
  .ab-auto{margin-left:0}

  /* bottom tab bar */
  .bottomnav{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:95;
    background:rgba(255,255,255,.94);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
    border-top:1px solid var(--line2);justify-content:space-around;
    padding:6px 4px calc(6px + env(safe-area-inset-bottom));
    box-shadow:0 -6px 20px rgba(108,82,180,.08);
  }
  .bnav{flex:1;min-width:0;background:none;border:none;display:flex;flex-direction:column;align-items:center;gap:3px;color:var(--txt-dim);font-family:inherit;font-size:10.5px;font-weight:600;padding:6px 2px;cursor:pointer;border-radius:10px}
  .bnav svg{width:23px;height:23px}
  .bnav.active{color:var(--accent)}
  .bnav span{white-space:nowrap}
  .appfoot{display:none}
}

@media (max-width:420px){
  .statstrip{grid-template-columns:1fr 1fr}
  .hl-tools .btn.sm{flex:1 1 auto}
  .detail-actions{flex-direction:column}
  .detail-actions .btn{width:100%;justify-content:center}
}