:root{
  --ink:#242a2e; --muted:#5d6873; --line:#e6e3db; --paper:#fffdfa; --bg:#f4f1ea;
  --accent:#2f6b4f; --tint:#eef5f0; --soft:#d7e7dd; --accent-ink:#245740;
  --ok:#2f8f5b;
}
body.theme-bio{ --accent:#2f6b4f; --tint:#eef5f0; --soft:#d3e7db; --accent-ink:#245740; }
body.theme-mk { --accent:#5a4a86; --tint:#f1eef8; --soft:#ddd4f0; --accent-ink:#4a3c74; }

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;line-height:1.5;font-size:16px}
h1,h2,h3{font-family:'Iowan Old Style','Palatino Linotype',Palatino,Georgia,serif;margin:0;font-weight:600}
a{color:inherit}
.wrap{max-width:820px;margin:0 auto;padding:0 18px}

/* topbar */
.topbar{background:var(--paper);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.topbar-in{display:flex;align-items:center;justify-content:space-between;height:52px}
.brand{font-weight:700;text-decoration:none;color:var(--ink)}
.logout{color:var(--muted);text-decoration:none;font-size:14px}
.logout:hover{color:var(--accent)}

/* ---------- login ---------- */
.login-body{display:flex;min-height:100vh;align-items:center;justify-content:center;
  background:linear-gradient(160deg,#eef5f0,#f4f1ea 60%,#f1eef8)}
.login-card{background:var(--paper);border:1px solid var(--line);border-radius:20px;
  padding:34px 30px;width:min(360px,92vw);box-shadow:0 12px 40px rgba(40,50,45,.10);text-align:center}
.login-mark{font-size:40px}
.login-card h1{font-size:23px;margin:.2em 0 .1em}
.login-sub{color:var(--muted);margin:0 0 18px;font-size:14px}
.login-input{width:100%;padding:13px 14px;border:1.5px solid var(--line);border-radius:12px;font-size:17px;
  text-align:center;letter-spacing:.15em;background:#fff}
.login-input:focus{outline:none;border-color:var(--accent)}
.login-remember{display:flex;gap:8px;align-items:center;justify-content:center;color:var(--muted);
  font-size:13.5px;margin:14px 0 18px}
.login-err{background:#fdeeee;color:#a23;border:1px solid #f3cccc;border-radius:10px;padding:9px;font-size:13.5px;margin-bottom:14px}
.btn-primary{width:100%;padding:13px;border:none;border-radius:12px;background:var(--accent);color:#fff;
  font-size:16px;font-weight:600;cursor:pointer}
.btn-primary:hover{filter:brightness(1.06)}

/* ---------- home ---------- */
.home{padding:26px 18px 60px}
.home-hello{font-size:17px;color:#3a424a;margin:6px 0 22px}
.subject-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:620px){.subject-grid{grid-template-columns:1fr}}
.subj-card{display:block;text-decoration:none;background:var(--paper);border:1px solid var(--line);
  border-top:5px solid var(--accent);border-radius:16px;padding:18px 18px 16px;color:var(--ink);
  transition:transform .12s ease, box-shadow .12s ease}
.subj-card.theme-bio{--accent:#2f6b4f} .subj-card.theme-mk{--accent:#5a4a86}
.subj-card:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(40,50,45,.10)}
.subj-card-top{display:flex;gap:12px;align-items:center;margin-bottom:14px}
.subj-emoji{font-size:30px}
.subj-name{font-weight:700;font-size:18px}
.subj-teacher{color:var(--muted);font-size:13px}
.subj-stats{display:flex;justify-content:space-between;align-items:center;margin-top:9px;font-size:13px;color:var(--muted)}
.aced-chip{color:var(--ok);font-weight:600}
.home-foot{color:var(--muted);font-size:13px;text-align:center;margin-top:30px;line-height:2}
.print-link{color:var(--accent);text-decoration:none;font-weight:600}
.print-link:hover{text-decoration:underline}

/* bars */
.bar{height:9px;background:#eceae3;border-radius:20px;overflow:hidden}
.bar span{display:block;height:100%;background:var(--accent);border-radius:20px;transition:width .3s ease}
.bar.big{height:12px}

/* ---------- subject hero ---------- */
.subject-hero{background:var(--tint);border-bottom:1px solid var(--soft);padding:22px 0 20px}
.hero-kicker{letter-spacing:.18em;text-transform:uppercase;font-size:11px;color:var(--accent);font-weight:700}
.subject-hero h1{font-size:28px;margin:.1em 0 .12em}
.hero-meta{color:var(--muted);font-size:14px;margin-bottom:14px}
.hero-bar{display:flex;align-items:center;gap:12px}
.hero-bar .bar{flex:1}
.hero-count{font-size:13px;color:var(--muted);white-space:nowrap}

/* ---------- sheet ---------- */
.sheet{padding:22px 18px 70px}
.week-head{margin:24px 0 12px}
.week-pill{display:inline-block;background:var(--accent);color:#fff;font-family:inherit;font-weight:700;
  font-size:12px;letter-spacing:.08em;text-transform:uppercase;padding:6px 15px;border-radius:20px}
.lesson{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:0 0 16px}
.lesson-head{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;border-bottom:1px dotted var(--line);padding-bottom:8px}
.badge{font-size:10px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);
  background:var(--tint);border:1px solid var(--soft);padding:3px 9px;border-radius:6px}
.lesson-title{font-weight:600;font-size:17px;font-family:'Iowan Old Style',Palatino,Georgia,serif}
.lesson-summary{font-size:13.5px;color:var(--muted);margin:8px 0 4px}
.material-link{display:inline-flex;align-items:center;gap:7px;text-decoration:none;font-size:13px;
  color:var(--accent-ink);background:var(--tint);border:1px solid var(--soft);border-radius:9px;
  padding:7px 12px;margin:6px 0 4px;font-weight:600;max-width:100%}
.material-link:hover{background:var(--soft)}
.material-link .mat-name{color:var(--muted);font-weight:400;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
@media(max-width:600px){.material-link .mat-name{display:none}}

/* topic */
.topic{display:flex;gap:14px;padding:14px 0;border-top:1px solid #efece5}
.topic:first-of-type{border-top:none}
.ticks{flex:none;display:flex;flex-direction:column;gap:8px}
.chk{display:inline-flex;align-items:center;gap:7px;background:none;border:none;cursor:pointer;
  font-size:12px;color:var(--muted);padding:2px;font-family:inherit;white-space:nowrap}
.chk .box{width:20px;height:20px;border:2px solid #b7bdc2;border-radius:6px;flex:none;background:#fff;
  display:inline-flex;align-items:center;justify-content:center;transition:all .12s ease}
.chk[aria-pressed="true"] .box{background:var(--accent);border-color:var(--accent)}
.chk[aria-pressed="true"] .box::after{content:"✓";color:#fff;font-size:13px;font-weight:800}
.chk[aria-pressed="true"]{color:var(--accent-ink);font-weight:600}
.topic-body{flex:1;min-width:0}
.topic-name{font-weight:700;font-size:15.5px}
.topic.is-done .topic-name{color:var(--accent-ink)}
.topic-aced{color:var(--ok);font-size:12px;font-weight:700;margin-left:8px}
.topic-summary{font-size:14px;color:#333b42;margin:3px 0 8px}
.notes{margin:0 0 10px}
.notes>summary{cursor:pointer;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);
  font-weight:700;list-style:none;display:inline-flex;align-items:center;gap:5px}
.notes>summary::-webkit-details-marker{display:none}
.notes>summary::before{content:"▸";transition:transform .12s}
.notes[open]>summary::before{transform:rotate(90deg)}
.notes ul{margin:8px 0 0;padding:10px 14px;background:var(--tint);border-radius:8px}
.notes li{font-size:13px;color:#3a424a;margin:3px 0}

/* quiz buttons */
.quizbtn{display:inline-flex;align-items:center;gap:6px;text-decoration:none;font-size:13.5px;font-weight:600;
  padding:8px 14px;border-radius:10px;margin-top:2px}
.quizbtn .lock{display:none}
.topic-quiz{background:var(--accent);color:#fff}
.topic-quiz:hover{filter:brightness(1.07)}
.quizbtn.locked{background:#f0eee8;color:#9aa0a6;cursor:default;font-weight:500}
.quizbtn.locked .go{display:none}
.quizbtn.locked .lock{display:inline}
.quizbtn.shake{animation:shake .4s}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.lesson-quiz{margin-top:12px;padding-top:12px;border-top:1px dashed var(--soft);display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.lesson-quiz-btn{background:linear-gradient(135deg,var(--accent),var(--accent-ink));color:#fff}
.lesson-aced{color:var(--ok);font-weight:700;font-size:13px}

@media(max-width:600px){
  .topic{flex-direction:column;gap:10px}
  .ticks{flex-direction:row;gap:18px;order:2}
  .topic-body{order:1}
  .chk .box{width:24px;height:24px}
  .chk{font-size:13px}
}

/* ---------- quiz runner ---------- */
.quiz-wrap{padding:24px 18px 70px;max-width:640px}
.quiz-card{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:22px;
  box-shadow:0 8px 30px rgba(40,50,45,.07)}
.q-progress{display:flex;gap:6px;margin-bottom:18px}
.q-progress i{height:6px;flex:1;background:#e7e4dd;border-radius:6px}
.q-progress i.done{background:var(--accent)}
.q-count{font-size:12px;color:var(--muted);letter-spacing:.05em;margin-bottom:6px}
.q-text{font-size:19px;font-weight:600;font-family:'Iowan Old Style',Palatino,Georgia,serif;margin:0 0 18px;line-height:1.35}
.opt{display:block;width:100%;text-align:left;background:#fff;border:1.5px solid var(--line);border-radius:12px;
  padding:14px 16px;margin:9px 0;font-size:15.5px;cursor:pointer;transition:all .1s ease;font-family:inherit;color:var(--ink)}
.opt:hover{border-color:var(--accent);background:var(--tint)}
.opt:active{transform:scale(.995)}

/* results */
.q-result{text-align:center}
.q-score{font-size:44px;font-weight:800;font-family:'Iowan Old Style',Palatino,Georgia,serif}
.q-score.ace{color:var(--ok)}
.q-msg{color:#3a424a;margin:6px 0 18px;font-size:15px}
.q-ace-banner{background:#e9f7ee;border:1px solid #bfe6cd;color:#1f7a45;border-radius:12px;padding:12px;
  font-weight:700;margin:0 0 18px}
.q-review{text-align:left;margin-top:10px}
.q-review h3{font-size:14px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:14px 0 8px}
.q-wrong{border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin:10px 0;background:#fff}
.q-wrong .qq{font-weight:600;margin-bottom:6px}
.q-wrong .yours{color:#b3261e;font-size:14px}
.q-wrong .right{color:var(--ok);font-size:14px;font-weight:600}
.q-actions{display:flex;gap:10px;justify-content:center;margin-top:20px;flex-wrap:wrap}
.q-btn{padding:11px 20px;border-radius:11px;border:none;cursor:pointer;font-size:15px;font-weight:600;text-decoration:none;font-family:inherit}
.q-btn.primary{background:var(--accent);color:#fff}
.q-btn.ghost{background:#f0eee8;color:var(--ink)}