/* =============================================================
   The Cardiac Dance — page & component styles
   ============================================================= */

/* ============================================================
   HERO  (landing)
   ============================================================ */
.hero { padding: 60px 0 40px; position: relative; }
.hero-grid {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 50px; align-items: center;
}
.hero h1 { margin: 18px 0 18px; }
.hero-lead { font-size: 1.14rem; color: var(--text-soft); max-width: 520px; }
.hero-actions { display: flex; gap: 14px; margin-top: 30px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 30px; margin-top: 36px; flex-wrap: wrap; }
.hero-stats .stat .n { font-family: var(--font-head); font-size: 1.7rem; font-weight: 700; color: var(--text); }
.hero-stats .stat .l { font-size: 0.78rem; color: var(--text-mute); text-transform: uppercase; letter-spacing: 0.1em; }

.hero-monitor { position: relative; }
.hero-monitor .monitor { box-shadow: var(--shadow); }
.hero-monitor .monitor canvas { height: 320px; }
.monitor-foot {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 12px 16px; background: #060b0c;
  border-top: 1px solid #14302a;
  font-family: var(--font-head); font-size: 0.72rem;
}
.monitor-foot .mf { color: var(--text-mute); }
.monitor-foot .mf b { color: var(--ecg); font-weight: 600; }
.hero-badge {
  position: absolute; right: -14px; top: -20px;
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: 12px; padding: 10px 14px;
  display: flex; align-items: center; gap: 9px;
  box-shadow: var(--shadow-sm);
  font-size: 0.82rem; font-weight: 600;
}
.hero-badge .pulse-ring {
  width: 10px; height: 10px; border-radius: 50%; background: var(--neon-pink);
  box-shadow: 0 0 0 0 rgba(255,92,138,0.6);
  animation: ring 1.8s infinite;
}
@keyframes ring { 100% { box-shadow: 0 0 0 12px rgba(255,92,138,0); } }

/* marquee strip of mini ECG terms */
.ticker {
  border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft);
  background: var(--bg-2); overflow: hidden; padding: 14px 0;
}
.ticker-track { display: flex; gap: 42px; white-space: nowrap; animation: scrollx 38s linear infinite; }
.ticker-track span { font-family: var(--font-head); font-weight: 600; color: var(--text-mute); font-size: 0.92rem; display: flex; align-items: center; gap: 42px; }
.ticker-track span::after { content: "♥"; color: var(--ecg); opacity: 0.5; }
@keyframes scrollx { to { transform: translateX(-50%); } }

/* ============================================================
   VENUE MAP
   ============================================================ */
.venue-map { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.room {
  position: relative;
  background: linear-gradient(170deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 22px 20px;
  overflow: hidden;
  transition: transform .18s, border-color .18s;
  display: block;
}
.room:hover { transform: translateY(-5px); border-color: var(--room-c, var(--ecg)); }
.room::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--room-c, var(--ecg));
}
.room .room-ico {
  width: 46px; height: 46px; border-radius: 12px;
  display: grid; place-items: center; font-size: 1.4rem;
  background: var(--bg); border: 1px solid var(--line);
  margin-bottom: 14px;
}
.room h4 { font-size: 1.04rem; margin-bottom: 3px; }
.room .room-sub { font-size: 0.78rem; color: var(--room-c, var(--ecg)); font-weight: 600; font-family: var(--font-head); letter-spacing: 0.03em; }
.room p { font-size: 0.86rem; margin-top: 8px; color: var(--text-mute); }
.room .room-go { margin-top: 12px; font-size: 0.8rem; font-weight: 600; color: var(--text-soft); display:flex; align-items:center; gap:6px; }

/* feature cards */
.feature {
  padding: 26px 24px;
}
.feature .f-ico {
  width: 50px; height: 50px; border-radius: 13px;
  display: grid; place-items: center; margin-bottom: 16px;
  background: var(--bg); border: 1px solid var(--line);
}
.feature .f-ico svg { width: 26px; height: 26px; }
.feature:hover { transform: translateY(-4px); border-color: var(--line); box-shadow: var(--shadow-sm); }
.feature h3 { font-size: 1.16rem; margin-bottom: 8px; }
.feature p { font-size: 0.93rem; }

/* guides */
.guides { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.guide-card { display: flex; gap: 18px; padding: 26px; align-items: flex-start; }
.guide-card .g-portrait {
  width: 72px; height: 72px; border-radius: 18px; flex-shrink: 0;
  display: grid; place-items: center; font-size: 2.2rem;
  border: 1px solid var(--line);
}
.guide-card.pulse .g-portrait { background: rgba(70,212,255,0.1); border-color: rgba(70,212,255,0.3); }
.guide-card.bot .g-portrait { background: rgba(52,231,166,0.1); border-color: rgba(52,231,166,0.3); }
.guide-card h3 { font-size: 1.2rem; }
.guide-card .g-role { font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 8px; }
.guide-card.pulse .g-role { color: var(--neon-cyan); }
.guide-card.bot .g-role { color: var(--ecg); }
.guide-card p { font-size: 0.92rem; }

/* CTA band */
.cta-band {
  background: linear-gradient(120deg, var(--surface-2), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 52px 48px;
  text-align: center;
  position: relative; overflow: hidden;
}
.cta-band h2 { margin-bottom: 12px; }
.cta-band p { max-width: 520px; margin: 0 auto 26px; }
.cta-band .ecg-line { position: absolute; left: 0; right: 0; opacity: 0.15; }
.cta-band .ecg-line.top { top: 18px; }
.cta-band .ecg-line.bot { bottom: 18px; }

/* ============================================================
   PAGE HEADER (interior pages)
   ============================================================ */
.page-hero {
  padding: 54px 0 30px;
  border-bottom: 1px solid var(--line-soft);
}
.page-hero h1 { margin: 14px 0 14px; font-size: clamp(2rem, 4vw, 3rem); }
.page-hero p { font-size: 1.06rem; max-width: 640px; }
.crumb { font-size: 0.82rem; color: var(--text-mute); margin-bottom: 4px; }
.crumb a:hover { color: var(--ecg); }

/* ============================================================
   RHYTHM LIBRARY
   ============================================================ */
.lib-layout { display: grid; grid-template-columns: 232px 1fr; gap: 30px; align-items: start; }
.lib-filters {
  position: sticky; top: 90px;
  background: var(--surface); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 18px;
}
.lib-filters h4 { font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-mute); margin: 16px 0 8px; }
.lib-filters h4:first-child { margin-top: 0; }
.filter-btn {
  display: flex; align-items: center; gap: 9px; width: 100%;
  padding: 8px 11px; border-radius: 9px; font-size: 0.88rem;
  color: var(--text-soft); text-align: left; transition: background .14s, color .14s;
}
.filter-btn .dot { width: 9px; height: 9px; border-radius: 3px; flex-shrink: 0; }
.filter-btn .count { margin-left: auto; font-size: 0.74rem; color: var(--text-mute); }
.filter-btn:hover { background: var(--surface-2); color: var(--text); }
.filter-btn.active { background: var(--surface-3); color: var(--text); }
.lib-search {
  width: 100%; padding: 11px 14px; border-radius: 10px;
  background: var(--bg); border: 1px solid var(--line);
  color: var(--text); font-size: 0.92rem; margin-bottom: 18px;
}
.lib-search:focus { outline: none; border-color: var(--ecg); }
.lib-search::placeholder { color: var(--text-mute); }

.lib-count { font-size: 0.86rem; color: var(--text-mute); margin-bottom: 16px; }
.lib-count b { color: var(--text); }

.rhythm-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }

.rhythm-card {
  background: var(--surface); border: 1px solid var(--line-soft);
  border-radius: var(--radius); overflow: hidden; cursor: pointer;
  transition: transform .16s, border-color .16s, box-shadow .16s;
  display: flex; flex-direction: column;
}
.rhythm-card:hover { transform: translateY(-4px); border-color: var(--fam-c, var(--ecg)); box-shadow: var(--shadow-sm); }
.rhythm-card .rc-head { padding: 15px 17px 13px; }
.rhythm-card .rc-monitor { height: 116px; position: relative; border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.rhythm-card .rc-foot { padding: 13px 17px 17px; flex: 1; display: flex; flex-direction: column; }
.rhythm-card .rc-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.rhythm-card h3 { font-size: 1.05rem; }
.rhythm-card .rc-abbr { font-size: 0.78rem; color: var(--fam-c, var(--ecg)); font-weight: 600; font-family: var(--font-head); }
.rhythm-card .rc-desc { font-size: 0.86rem; color: var(--text-mute); margin-top: 0; flex: 1; }
.rhythm-card .rc-meta { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.mini-tag {
  font-size: 0.7rem; font-weight: 600; padding: 3px 8px; border-radius: 6px;
  background: var(--bg); border: 1px solid var(--line); color: var(--text-soft);
}
.fam-pill {
  font-size: 0.68rem; font-weight: 700; padding: 3px 9px; border-radius: 999px;
  font-family: var(--font-head); text-transform: uppercase; letter-spacing: 0.05em;
}

/* rhythm detail modal */
.modal-back {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(5,8,14,0.8); backdrop-filter: blur(6px);
  display: none; align-items: flex-start; justify-content: center;
  padding: 40px 20px; overflow-y: auto;
}
.modal-back.open { display: flex; }
.modal {
  background: var(--bg-2); border: 1px solid var(--line);
  border-radius: var(--radius-lg); max-width: 760px; width: 100%;
  box-shadow: var(--shadow); overflow: hidden;
  animation: pop .22s ease;
}
@keyframes pop { from { opacity: 0; transform: translateY(20px) scale(.98); } }
.modal-monitor { height: 200px; position: relative; }
.modal-close {
  position: absolute; top: 14px; right: 14px; z-index: 3;
  width: 38px; height: 38px; border-radius: 10px;
  background: rgba(8,12,20,0.7); border: 1px solid var(--line);
  display: grid; place-items: center; font-size: 1.1rem; color: var(--text);
}
.modal-close:hover { background: var(--surface-2); }
.modal-body { padding: 26px 30px 32px; }
.modal-body .m-fam { font-family: var(--font-head); font-weight: 700; font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.1em; }
.modal-body h2 { margin: 6px 0 4px; }
.modal-body .m-abbr { color: var(--text-mute); font-size: 0.95rem; margin-bottom: 14px; }
.modal-body .m-desc { font-size: 1rem; }

.fivestep { display: grid; grid-template-columns: repeat(5,1fr); gap: 10px; margin: 22px 0; }
.fivestep .fs {
  background: var(--surface); border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm); padding: 12px 11px;
}
.fivestep .fs .fs-n { font-family: var(--font-head); font-weight: 700; font-size: 0.72rem; color: var(--ecg); }
.fivestep .fs .fs-k { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-mute); margin: 3px 0 5px; }
.fivestep .fs .fs-v { font-size: 0.86rem; color: var(--text); font-weight: 500; line-height: 1.4; }

.m-section { margin-top: 20px; }
.m-section h4 {
  font-family: var(--font-head); font-size: 0.78rem; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--text-mute); margin-bottom: 8px;
  display: flex; align-items: center; gap: 8px;
}
.m-section p { font-size: 0.95rem; }
.m-section .chiprow { display: flex; gap: 8px; flex-wrap: wrap; }

.urgency {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 5px 12px; border-radius: 999px; font-size: 0.78rem; font-weight: 700;
  font-family: var(--font-head);
}
.urgency.low { background: rgba(52,231,166,0.13); color: var(--ecg); }
.urgency.moderate { background: rgba(255,180,84,0.14); color: var(--warn); }
.urgency.high { background: rgba(255,92,108,0.14); color: var(--danger); }
.urgency.critical { background: var(--danger); color: #fff; }

/* ============================================================
   LEARN  /  chapters
   ============================================================ */
.learn-layout { display: grid; grid-template-columns: 270px 1fr; gap: 36px; align-items: start; }
.chapter-nav {
  position: sticky; top: 90px;
  background: var(--surface); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 14px; max-height: calc(100vh - 110px); overflow-y: auto;
}
.chapter-nav .cn-group { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-mute); padding: 12px 10px 6px; }
.chapter-nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 10px; border-radius: 9px; font-size: 0.88rem;
  color: var(--text-soft); transition: background .14s, color .14s;
}
.chapter-nav a:hover { background: var(--surface-2); color: var(--text); }
.chapter-nav a.active { background: var(--ecg-deep); color: var(--ecg); }
.chapter-nav a .cn-num {
  width: 24px; height: 24px; flex-shrink: 0; border-radius: 7px;
  background: var(--bg); border: 1px solid var(--line);
  display: grid; place-items: center; font-size: 0.74rem; font-weight: 700;
  font-family: var(--font-head);
}
.chapter-nav a.active .cn-num { background: var(--ecg); color: var(--ink); border-color: var(--ecg); }

.chapter { display: none; }
.chapter.active { display: block; animation: fade .3s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(10px); } }
.chapter-head { margin-bottom: 8px; }
.chapter-head .ch-label { font-family: var(--font-head); font-weight: 700; color: var(--ecg); font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase; }
.chapter-head h2 { margin: 6px 0 6px; }
.chapter-head .ch-room { color: var(--text-mute); font-size: 0.95rem; font-style: italic; }
.chapter-body { font-size: 1rem; }
.chapter-body h3 { font-family: var(--font-head); margin: 30px 0 10px; color: var(--text); font-size: 1.3rem; }
.chapter-body p { margin: 13px 0; }
.chapter-pager { display: flex; justify-content: space-between; gap: 14px; margin-top: 44px; padding-top: 24px; border-top: 1px solid var(--line-soft); }
.chapter-pager a { flex: 1; }
.pager-btn {
  display: flex; flex-direction: column; gap: 2px;
  padding: 14px 18px; border-radius: var(--radius-sm);
  background: var(--surface); border: 1px solid var(--line-soft);
  transition: border-color .15s, background .15s;
}
.pager-btn:hover { border-color: var(--ecg); background: var(--surface-2); }
.pager-btn .pg-dir { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-mute); }
.pager-btn .pg-title { font-family: var(--font-head); font-weight: 600; font-size: 0.95rem; color: var(--text); }
.pager-btn.next { text-align: right; }

.progress-bar { height: 5px; background: var(--surface-3); border-radius: 99px; overflow: hidden; margin-top: 8px; }
.progress-bar .fill { height: 100%; background: linear-gradient(90deg, var(--ecg), var(--neon-cyan)); border-radius: 99px; transition: width .3s; }

/* embedded rhythm demo inside a chapter */
.demo-strip { margin: 22px 0; }
.demo-strip .monitor canvas { height: 130px; }
.demo-caption { font-size: 0.82rem; color: var(--text-mute); margin-top: 8px; text-align: center; }

/* annotated beat diagram */
.beat-diagram { background: var(--surface); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 20px; margin: 22px 0; }

/* ============================================================
   QUIZ
   ============================================================ */
.quiz-pick { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.quiz-pick-card {
  padding: 20px; cursor: pointer;
  display: flex; flex-direction: column; gap: 6px;
}
.quiz-pick-card:hover { transform: translateY(-4px); border-color: var(--ecg); }
.quiz-pick-card .qp-n { font-family: var(--font-head); font-weight: 700; color: var(--ecg); font-size: 0.78rem; }
.quiz-pick-card h3 { font-size: 1.05rem; }
.quiz-pick-card p { font-size: 0.84rem; color: var(--text-mute); }
.quiz-pick-card .qp-meta { margin-top: auto; padding-top: 12px; font-size: 0.78rem; color: var(--text-soft); display: flex; gap: 12px; }
.quiz-pick-card.exam { background: linear-gradient(150deg, rgba(255,92,138,0.1), var(--surface)); border-color: rgba(255,92,138,0.3); }
.quiz-pick-card.exam .qp-n { color: var(--neon-pink); }

.quiz-stage { max-width: 720px; margin: 0 auto; }
.quiz-topbar { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 18px; }
.quiz-topbar .qt-title { font-family: var(--font-head); font-weight: 600; }
.quiz-topbar .qt-prog { font-size: 0.86rem; color: var(--text-mute); }

.question-card { padding: 28px; }
.q-type {
  display: inline-block; font-size: 0.7rem; font-weight: 700; font-family: var(--font-head);
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: 3px 9px; border-radius: 6px; margin-bottom: 12px;
  background: var(--ecg-deep); color: var(--ecg);
}
.q-type.scenario { background: rgba(255,92,138,0.13); color: var(--neon-pink); }
.q-type.fill { background: rgba(157,123,255,0.13); color: var(--neon-violet); }
.q-type.short { background: rgba(255,180,84,0.13); color: var(--warn); }
.q-text { font-size: 1.12rem; font-family: var(--font-head); font-weight: 500; line-height: 1.45; margin-bottom: 8px; }

.q-options { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }
.q-option {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; border-radius: var(--radius-sm);
  background: var(--surface-2); border: 1px solid var(--line-soft);
  transition: border-color .14s, background .14s; text-align: left;
  font-size: 0.96rem;
}
.q-option:hover:not(:disabled) { border-color: var(--ecg); }
.q-option .opt-key {
  width: 28px; height: 28px; flex-shrink: 0; border-radius: 8px;
  background: var(--bg); border: 1px solid var(--line);
  display: grid; place-items: center; font-weight: 700; font-family: var(--font-head);
  font-size: 0.84rem;
}
.q-option.correct { border-color: var(--ecg); background: rgba(52,231,166,0.1); }
.q-option.correct .opt-key { background: var(--ecg); color: var(--ink); border-color: var(--ecg); }
.q-option.wrong { border-color: var(--danger); background: rgba(255,92,108,0.1); }
.q-option.wrong .opt-key { background: var(--danger); color: #fff; border-color: var(--danger); }
.q-option:disabled { cursor: default; }

.q-fill {
  width: 100%; padding: 14px 16px; border-radius: var(--radius-sm);
  background: var(--surface-2); border: 1px solid var(--line);
  color: var(--text); font-size: 1rem; margin-top: 16px;
}
.q-fill:focus { outline: none; border-color: var(--ecg); }

.q-hint { font-size: 0.86rem; color: var(--text-mute); font-style: italic; margin-top: 14px; }
.q-hint .hint-toggle { color: var(--neon-cyan); font-weight: 600; cursor: pointer; font-style: normal; }

.q-explain {
  margin-top: 18px; padding: 16px 18px; border-radius: var(--radius-sm);
  background: var(--bg-2); border: 1px solid var(--line-soft);
  font-size: 0.93rem;
}
.q-explain .qe-head { font-weight: 700; font-family: var(--font-head); margin-bottom: 6px; font-size: 0.86rem; }
.q-explain.right .qe-head { color: var(--ecg); }
.q-explain.wrong .qe-head { color: var(--danger); }
.q-explain .qe-model { margin-top: 8px; color: var(--text-soft); }
.q-explain .qe-model b { color: var(--text); }

.quiz-actions { display: flex; justify-content: space-between; gap: 12px; margin-top: 20px; }

.model-answer {
  margin-top: 16px; padding: 16px 18px; border-radius: var(--radius-sm);
  background: var(--ecg-deep); border: 1px solid rgba(52,231,166,0.3);
  font-size: 0.93rem;
}
.model-answer .ma-head { color: var(--ecg); font-weight: 700; font-family: var(--font-head); font-size: 0.82rem; margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.06em; }

/* results */
.quiz-result { max-width: 620px; margin: 0 auto; text-align: center; }
.score-ring {
  width: 180px; height: 180px; margin: 0 auto 24px; position: relative;
}
.score-ring .score-num { position: absolute; inset: 0; display: grid; place-items: center; }
.score-ring .score-num .sn-pct { font-family: var(--font-head); font-size: 2.6rem; font-weight: 700; }
.score-ring .score-num .sn-lbl { font-size: 0.78rem; color: var(--text-mute); text-transform: uppercase; letter-spacing: 0.1em; }
.score-verdict { font-family: var(--font-head); font-size: 1.3rem; font-weight: 600; margin-bottom: 8px; }
.result-breakdown { margin-top: 26px; text-align: left; }
.result-row {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; border-radius: var(--radius-sm);
  background: var(--surface); border: 1px solid var(--line-soft); margin-bottom: 8px;
}
.result-row .rr-ico { width: 26px; height: 26px; border-radius: 7px; display: grid; place-items: center; flex-shrink: 0; font-weight: 700; }
.result-row .rr-ico.ok { background: rgba(52,231,166,0.15); color: var(--ecg); }
.result-row .rr-ico.no { background: rgba(255,92,108,0.15); color: var(--danger); }
.result-row .rr-ico.skip { background: var(--surface-3); color: var(--text-mute); }
.result-row .rr-q { font-size: 0.9rem; flex: 1; }

/* ============================================================
   GLOSSARY
   ============================================================ */
.glossary-tools { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; margin-bottom: 8px; }
.glossary-tools .lib-search { margin-bottom: 0; max-width: 360px; }
.alpha-nav { display: flex; flex-wrap: wrap; gap: 5px; margin: 18px 0 28px; }
.alpha-nav button {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--surface); border: 1px solid var(--line-soft);
  font-weight: 700; font-family: var(--font-head); font-size: 0.84rem; color: var(--text-soft);
  transition: .14s;
}
.alpha-nav button:hover:not(:disabled) { border-color: var(--ecg); color: var(--ecg); }
.alpha-nav button:disabled { opacity: 0.3; cursor: default; }
.glossary-letter { margin-bottom: 30px; }
.glossary-letter .gl-letter {
  font-family: var(--font-head); font-size: 1.5rem; font-weight: 700; color: var(--ecg);
  border-bottom: 1px solid var(--line-soft); padding-bottom: 6px; margin-bottom: 14px;
}
.term-card { padding: 18px 20px; margin-bottom: 12px; }
.term-card h3 { font-size: 1.05rem; margin-bottom: 5px; }
.term-card .t-abbr { color: var(--text-mute); font-weight: 500; font-size: 0.9rem; }
.term-card p { font-size: 0.93rem; }
.term-card .t-chap { font-size: 0.76rem; color: var(--neon-cyan); font-weight: 600; margin-top: 8px; display: inline-block; }

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid { display: grid; grid-template-columns: 1fr 320px; gap: 40px; align-items: start; }
.author-card { padding: 28px; position: sticky; top: 90px; }
.author-card .a-portrait {
  width: 90px; height: 90px; border-radius: 22px; margin-bottom: 16px;
  background: linear-gradient(150deg, var(--surface-3), var(--bg));
  border: 1px solid var(--line); display: grid; place-items: center;
  font-family: var(--font-head); font-weight: 700; font-size: 1.8rem; color: var(--ecg);
}
.author-card h3 { font-size: 1.2rem; }
.author-card .a-creds { color: var(--ecg); font-weight: 600; font-size: 0.86rem; margin-bottom: 14px; }
.author-card .a-fact { display: flex; gap: 10px; padding: 9px 0; border-top: 1px solid var(--line-soft); font-size: 0.86rem; }
.author-card .a-fact .af-k { color: var(--text-mute); width: 92px; flex-shrink: 0; }

.timeline { border-left: 2px solid var(--line); padding-left: 24px; margin: 20px 0; }
.timeline .tl-item { position: relative; padding-bottom: 24px; }
.timeline .tl-item::before {
  content: ""; position: absolute; left: -31px; top: 4px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--ecg);
}
.timeline .tl-item h4 { font-size: 1rem; color: var(--text); }
.timeline .tl-item p { font-size: 0.92rem; margin-top: 4px; }

.step-list { counter-reset: step; }
.step-list .step-item {
  display: flex; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--line-soft);
}
.step-list .step-item:last-child { border-bottom: none; }
.step-list .step-item .step-num {
  width: 38px; height: 38px; flex-shrink: 0; border-radius: 11px;
  background: var(--ecg-deep); border: 1px solid rgba(52,231,166,0.3);
  display: grid; place-items: center; color: var(--ecg);
  font-family: var(--font-head); font-weight: 700;
}
.step-list .step-item h4 { font-size: 1.04rem; margin-bottom: 3px; }
.step-list .step-item p { font-size: 0.92rem; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-monitor { order: -1; }
  .lib-layout { grid-template-columns: 1fr; }
  .lib-filters { position: static; display: flex; flex-wrap: wrap; gap: 6px; }
  .lib-filters h4 { width: 100%; }
  .learn-layout { grid-template-columns: 1fr; }
  .chapter-nav { position: static; max-height: none; }
  .about-grid { grid-template-columns: 1fr; }
  .author-card { position: static; }
  .venue-map { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .rhythm-grid { grid-template-columns: 1fr; }
  .quiz-pick { grid-template-columns: 1fr; }
  .guides { grid-template-columns: 1fr; }
  .fivestep { grid-template-columns: repeat(2,1fr); }
  .venue-map { grid-template-columns: 1fr; }
  .cta-band { padding: 36px 24px; }
  .modal-body { padding: 22px; }
  .chapter-pager { flex-direction: column; }
}

/* ============================================================
   AUTH & ACCOUNT
   ============================================================ */
.auth-shell {
  min-height: calc(100vh - 70px);
  display: flex; align-items: center; justify-content: center;
  padding: 50px 22px;
}
.auth-card {
  width: 100%; max-width: 430px;
  background: var(--surface); border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg); padding: 34px 32px;
  box-shadow: var(--shadow);
}
.auth-card .auth-brand { display: flex; justify-content: center; margin-bottom: 14px; }
.auth-card .auth-brand .mark { width: 46px; height: 46px; }
.auth-card h1 { font-size: 1.5rem; text-align: center; margin-bottom: 4px; }
.auth-card .auth-sub { text-align: center; color: var(--text-mute); font-size: 0.9rem; margin-bottom: 22px; }
.auth-tabs {
  display: flex; gap: 6px; background: var(--bg);
  border: 1px solid var(--line-soft); border-radius: 11px; padding: 4px; margin-bottom: 22px;
}
.auth-tabs button {
  flex: 1; padding: 9px; border-radius: 8px;
  font-family: var(--font-head); font-weight: 600; font-size: 0.88rem; color: var(--text-mute);
  transition: background .14s, color .14s;
}
.auth-tabs button.active { background: var(--ecg); color: var(--ink); }
.field { margin-bottom: 15px; }
.field label { display: block; font-size: 0.8rem; font-weight: 600; color: var(--text-soft); margin-bottom: 6px; }
.field input {
  width: 100%; padding: 12px 14px; border-radius: 10px;
  background: var(--bg); border: 1px solid var(--line);
  color: var(--text); font-size: 0.96rem;
}
.field input:focus { outline: none; border-color: var(--ecg); }
.auth-msg {
  font-size: 0.86rem; padding: 11px 14px; border-radius: 10px;
  margin-bottom: 16px; display: none;
}
.auth-msg.show { display: block; }
.auth-msg.err { background: rgba(255,92,108,0.12); color: #ff9aa3; border: 1px solid rgba(255,92,108,0.3); }
.auth-msg.ok  { background: rgba(52,231,166,0.12); color: var(--ecg); border: 1px solid rgba(52,231,166,0.3); }
.auth-card .btn { width: 100%; justify-content: center; }
.auth-foot { text-align: center; font-size: 0.84rem; color: var(--text-mute); margin-top: 16px; }
.auth-foot a, .link-btn { color: var(--neon-cyan); font-weight: 600; cursor: pointer; background: none; }
.link-btn:hover, .auth-foot a:hover { text-decoration: underline; }

.account-grid { display: grid; grid-template-columns: 1fr; gap: 22px; max-width: 680px; margin: 0 auto; }
.account-card {
  background: var(--surface); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 26px 28px;
}
.account-card h2 { font-size: 1.15rem; margin-bottom: 4px; }
.account-card .ac-sub { color: var(--text-mute); font-size: 0.88rem; margin-bottom: 16px; }
.ac-row {
  display: flex; justify-content: space-between; gap: 14px;
  padding: 11px 0; border-top: 1px solid var(--line-soft); font-size: 0.92rem;
}
.ac-row .ac-k { color: var(--text-mute); }
.ac-row .ac-v { color: var(--text); font-weight: 500; text-align: right; }
.sub-badge {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 4px 12px; border-radius: 999px;
  font-size: 0.78rem; font-weight: 700; font-family: var(--font-head);
}
.sub-badge.on  { background: rgba(52,231,166,0.14); color: var(--ecg); }
.sub-badge.off { background: var(--surface-3); color: var(--text-mute); }

.plan-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.plan-card {
  background: var(--bg-2); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 22px; position: relative;
}
.plan-card.best { border-color: var(--ecg); }
.plan-card .plan-tag {
  position: absolute; top: -10px; right: 16px;
  background: var(--ecg); color: var(--ink);
  font-size: 0.66rem; font-weight: 700; font-family: var(--font-head);
  padding: 3px 10px; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.05em;
}
.plan-card .plan-name { font-family: var(--font-head); font-weight: 600; font-size: 0.95rem; color: var(--text-soft); }
.plan-card .plan-price { font-family: var(--font-head); font-weight: 700; font-size: 2rem; margin: 6px 0 2px; }
.plan-card .plan-price small { font-size: 0.9rem; color: var(--text-mute); font-weight: 500; }
.plan-card .plan-note { font-size: 0.8rem; color: var(--text-mute); margin-bottom: 16px; min-height: 32px; }
.plan-card .btn { width: 100%; justify-content: center; }

/* paywall prompt (used by gated pages) */
.paywall {
  max-width: 560px; margin: 40px auto; text-align: center;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 40px 34px;
}
.paywall .pw-lock {
  width: 58px; height: 58px; margin: 0 auto 16px; border-radius: 16px;
  background: var(--ecg-deep); border: 1px solid rgba(52,231,166,0.3);
  display: grid; place-items: center; color: var(--ecg);
}
.paywall h2 { margin-bottom: 10px; }
.paywall p { font-size: 0.96rem; margin-bottom: 20px; }
.paywall .hero-actions { justify-content: center; }

@media (max-width: 540px) {
  .plan-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   TWO SYSTEMS (landing) - plumbing vs electrical rooms
   ============================================================ */
.two-systems { max-width: 980px; margin: 0 auto; }
.systems-key {
  font-size: 1.05rem; text-align: center; max-width: 760px;
  margin: 0 auto 40px; color: var(--text-soft);
}
.systems-key strong { color: var(--text); }
.system-block { margin-bottom: 26px; }
.system-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.system-tag { font-family: var(--font-head); font-weight: 700; font-size: 1.1rem; }
.system-note { font-size: 0.86rem; color: var(--text-mute); }
.system-focus {
  margin-left: auto; font-family: var(--font-head); font-weight: 700;
  font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--ink); background: var(--ecg); padding: 5px 12px; border-radius: 999px;
}
.room-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.sys-room {
  background: var(--surface); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 18px;
}
.sys-room .sr-meta {
  font-size: 0.72rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--text-mute);
}
.sys-room h4 { font-size: 1.06rem; margin: 4px 0 6px; }
.sys-room p { font-size: 0.85rem; color: var(--text-mute); }

.system-block.plumbing .sys-room { opacity: 0.78; }
.system-block.plumbing .system-tag { color: var(--text-soft); }
.system-block.plumbing .sys-room h4 { color: var(--text-soft); }

.system-block.electrical .system-tag { color: var(--ecg); }
.system-block.electrical .sys-room {
  border-color: rgba(52,231,166,0.28);
  background: linear-gradient(180deg, rgba(52,231,166,0.07), var(--surface));
}
.system-block.electrical .sys-room .sr-meta { color: var(--ecg); }
.system-block.electrical .sys-room h4 { color: var(--text); }

@media (max-width: 860px) { .room-row { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 460px) { .room-row { grid-template-columns: 1fr; } }

/* ============================================================
   CONTENT GATING - locks & the measurement diagram
   ============================================================ */
.chapter-nav a.locked { color: var(--text-mute); }
.chapter-nav a.locked .cn-num { opacity: 0.7; }
.cn-lock { margin-left: auto; display: inline-flex; color: var(--text-mute); }
.chapter-nav a.active.locked { color: var(--ecg); }
.chapter-nav a.active.locked .cn-lock { color: var(--ecg); }

.quiz-pick-card { position: relative; }
.quiz-pick-card.locked { opacity: 0.92; }
.qp-lock {
  position: absolute; top: 14px; right: 14px;
  width: 28px; height: 28px; border-radius: 8px;
  display: grid; place-items: center;
  background: var(--surface-3); color: var(--text-mute);
}
.quiz-pick-card.exam.locked .qp-lock { background: rgba(255,92,138,0.16); color: var(--neon-pink); }

.measure-fig { padding: 14px; }
.measure-fig svg { width: 100%; height: auto; display: block; border-radius: 8px; }
.measure-fig figcaption { margin-top: 12px; }

/* ============================================================
   MOBILE - collapsible chapter switcher & phone refinements
   ============================================================ */
.ch-switcher { display: none; }

@media (max-width: 980px) {
  /* on phones/tablets the lesson is front-and-centre; the 14-chapter
     list collapses behind a tap so it no longer buries the content */
  .learn-layout { gap: 16px; }
  .ch-switcher {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    width: 100%; padding: 13px 16px;
    background: var(--surface); border: 1px solid var(--line);
    border-radius: var(--radius-sm); color: var(--text);
    font-family: var(--font-head); font-weight: 600; font-size: 0.95rem;
  }
  .ch-switcher .chs-label {
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  }
  .ch-switcher .chs-caret {
    width: 18px; height: 18px; flex-shrink: 0; color: var(--ecg);
    transition: transform .2s ease;
  }
  .ch-switcher[aria-expanded="true"] .chs-caret { transform: rotate(180deg); }
  .chapter-nav { display: none; }
  .chapter-nav.nav-open {
    display: block; max-height: 62vh; overflow-y: auto;
  }
}

@media (max-width: 720px) {
  .page-hero { padding: 40px 0 24px; }
  .section-tight { padding: 34px 0; }
  .chapter-head h2 { font-size: 1.5rem; }
  .chapter-body { font-size: 0.98rem; }
  .chapter-body h3 { font-size: 1.16rem; margin: 24px 0 9px; }
  .chapter-body p { margin: 11px 0; }
  .callout { padding: 18px 17px; margin: 20px 0; }
  .speaker { padding: 15px 16px; gap: 11px; }
  .beat-diagram { padding: 12px; }
  .measure-fig { padding: 10px; }
  .account-card { padding: 22px 20px; }
  .account-card h2 { font-size: 1.1rem; }
  .ac-row { font-size: 0.9rem; }
  .ac-v { overflow-wrap: anywhere; }
  .pager-btn { padding: 12px 15px; }
}

@media (max-width: 430px) {
  .chapter-head h2 { font-size: 1.34rem; }
  .ac-row { flex-wrap: wrap; gap: 3px; }
  .ac-row .ac-v { text-align: left; }
  .plan-card { padding: 18px 16px; }
}