/* =========================================
   Data Driven Course — FRESH visual language
   Dark blue, gradient accents, generous space
   ========================================= */

:root{
  --bg-0:#070b1a;
  --bg-1:#0b1226;
  --bg-2:#0f1834;
  --bg-3:#13204a;
  --surface:#121b3a;
  --surface-2:#172554;
  --line:rgba(255,255,255,0.08);
  --line-2:rgba(255,255,255,0.14);
  --text:#eef2ff;
  --text-muted:#a9b3d6;
  --text-faint:#7280a8;
  --primary:#1e5bff;
  --primary-2:#5b86ff;
  --accent:#7ab7ff;
  --accent-2:#cfe0ff;
  --success:#22c55e;
  --danger:#ef4444;
  --warning:#f59e0b;
  --grad: linear-gradient(135deg,#5b86ff 0%, #7ab7ff 50%, #cfe0ff 100%);
  --grad-soft: linear-gradient(135deg, rgba(91,134,255,.18) 0%, rgba(122,183,255,.10) 100%);
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 22px;
  --shadow: 0 10px 30px rgba(0,5,30,.45);
  --shadow-soft: 0 4px 16px rgba(0,5,30,.25);
  --container: 1200px;
  --topbar-h: 64px;
  --bottom-h: 64px;
}

*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg-0);color:var(--text);font-family:'Manrope',ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body{
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(91,134,255,.18), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(122,183,255,.12), transparent 60%),
    radial-gradient(800px 600px at 110% 110%, rgba(91,134,255,.10), transparent 60%),
    var(--bg-0);
  min-height:100vh;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;border:0;background:transparent;color:inherit;cursor:pointer}
ul,ol{padding-left:1.1em;margin:0}
li{margin:.25em 0}
strong,b{font-weight:700;color:#fff}

/* =================== TOPBAR =================== */
.topbar{
  position:sticky;top:0;z-index:30;
  display:flex;align-items:center;justify-content:space-between;
  gap:18px;padding:10px 22px;
  height:var(--topbar-h);
  background:rgba(7,11,26,.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:12px;color:var(--text)}
.brand-logo-card{
  width:142px;height:34px;display:flex;align-items:center;justify-content:center;
  background:#fff;border-radius:9px;padding:5px 10px;
  box-shadow:0 8px 22px rgba(0,5,30,.22);
  border:1px solid rgba(255,255,255,.8);
  overflow:hidden;flex:0 0 auto;
}
.brand-logo-card img{width:100%;height:100%;object-fit:contain}
.brand-sub{color:var(--text-muted);font-size:12px;letter-spacing:.06em;text-transform:uppercase;border-left:1px solid var(--line-2);padding-left:12px}
.chapters-nav{display:none;gap:4px;overflow:hidden;flex:1;padding:0 8px;scrollbar-width:none}
.chapters-nav::-webkit-scrollbar{display:none}
.chapters-nav a{
  font-size:13px;color:var(--text-muted);padding:8px 12px;border-radius:999px;
  white-space:nowrap;transition:.2s;
}
.chapters-nav a:hover{color:#fff;background:rgba(255,255,255,.06)}
.chapters-nav a.active{color:#fff;background:rgba(91,134,255,.22);box-shadow:inset 0 0 0 1px rgba(122,183,255,.45)}
.top-right{display:flex;align-items:center;gap:14px}
.progress-mini{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--text-muted)}
.progress-mini-bar{width:110px;height:6px;background:rgba(255,255,255,.08);border-radius:999px;overflow:hidden}
#progressFill{height:100%;width:0;background:var(--grad);transition:width .35s ease}
.menu-btn{
  width:40px;height:40px;border-radius:12px;display:grid;place-items:center;
  background:rgba(255,255,255,.06);transition:.2s;color:#fff;
}
.menu-btn:hover{background:rgba(255,255,255,.12)}

/* =================== DRAWER =================== */
.drawer{
  position:fixed;top:0;right:0;height:100vh;width:min(420px,92vw);
  background:linear-gradient(180deg,#0b1226 0%, #07091e 100%);
  border-left:1px solid var(--line-2);
  transform:translateX(110%);transition:transform .35s cubic-bezier(.2,.7,.2,1);
  z-index:60;display:flex;flex-direction:column;
}
.drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:22px 24px;border-bottom:1px solid var(--line)}
.drawer-title{font-size:20px;font-weight:700}
.drawer-sub{font-size:12px;color:var(--text-muted);margin-top:4px}
.drawer-close{width:38px;height:38px;border-radius:10px;background:rgba(255,255,255,.06);display:grid;place-items:center;color:#fff}
.drawer-close:hover{background:rgba(255,255,255,.12)}
.drawer-body{padding:14px 18px;overflow:auto;flex:1}
.drawer-body a{
  display:flex;align-items:center;gap:14px;padding:12px 14px;border-radius:12px;
  color:var(--text-muted);margin-bottom:4px;transition:.2s;border:1px solid transparent;
}
.drawer-body a:hover{color:#fff;background:rgba(255,255,255,.06)}
.drawer-body a.active{color:#fff;background:rgba(91,134,255,.16);border-color:rgba(122,183,255,.35)}
.drawer-body .toc-n{font-size:11px;color:var(--text-faint);min-width:28px;letter-spacing:.05em}
.drawer-body a.active .toc-n{color:var(--accent)}
.drawer-scrim{
  position:fixed;inset:0;background:rgba(2,4,14,.55);backdrop-filter:blur(4px);
  opacity:0;pointer-events:none;z-index:55;transition:opacity .25s;
}
.drawer-scrim.open{opacity:1;pointer-events:auto}

/* =================== LAYOUT =================== */
main{padding:0 0 calc(var(--bottom-h) + 30px)}
.chapter{
  max-width:var(--container);
  margin:0 auto;
  padding:84px 24px 56px;
  scroll-margin-top:var(--topbar-h);
}
.kicker{font-size:12px;letter-spacing:.18em;color:var(--accent);text-transform:uppercase;margin-bottom:18px;font-weight:600}

/* =================== TYPOGRAPHY =================== */
.h-mega{font-size:clamp(28px,5.2vw,76px);line-height:1.08;letter-spacing:-.02em;font-weight:800;margin:0 0 22px;overflow-wrap:break-word}
.h-xl{font-size:clamp(24px,3.6vw,52px);line-height:1.12;letter-spacing:-.015em;font-weight:800;margin:0 0 18px;overflow-wrap:break-word}
.h-l{font-size:clamp(22px,2.4vw,32px);line-height:1.2;font-weight:700;margin:0 0 12px}
.section-h{font-size:clamp(18px,1.8vw,22px);font-weight:700;letter-spacing:.01em;margin:38px 0 18px;display:inline-block;padding-bottom:8px;border-bottom:2px solid rgba(122,183,255,.35)}
.lead{font-size:clamp(16px,1.4vw,20px);line-height:1.55;color:var(--text-muted);margin:0 0 22px;max-width:78ch}
.muted{color:var(--text-muted)}
.small{font-size:13px}
.grad-text{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;
  color:transparent;
}

/* =================== COVER =================== */
#cover{padding-top:50px}
.cover-hero{
  display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;
  background:linear-gradient(135deg, rgba(91,134,255,.18) 0%, rgba(122,183,255,.05) 100%);
  border:1px solid rgba(122,183,255,.22);
  border-radius:var(--radius-lg);
  padding:54px 48px;position:relative;overflow:hidden;min-height:480px;
}
.cover-hero::before{
  content:"";position:absolute;inset:auto -120px -120px auto;width:520px;height:520px;border-radius:50%;
  background:radial-gradient(closest-side, rgba(91,134,255,.35), transparent 70%);filter:blur(20px);
}
.cover-eyebrow{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:16px}
.cover-title{font-size:clamp(30px,5.4vw,80px);line-height:1.05;font-weight:800;letter-spacing:-.02em;margin:0 0 22px;overflow-wrap:break-word}
.cover-lead{font-size:clamp(16px,1.3vw,19px);line-height:1.55;color:var(--text-muted);max-width:60ch;margin:0 0 28px}
.cover-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:28px}
.cover-meta{display:flex;flex-wrap:wrap;gap:22px;color:var(--text-muted);font-size:14px}
.cover-meta span strong{color:#fff;font-weight:700;margin-right:6px}

.cover-art{position:relative;height:380px;display:grid;place-items:center}
.orbit{
  position:absolute;width:380px;height:380px;border-radius:50%;
  background:conic-gradient(from 120deg, rgba(91,134,255,.4), transparent 40%, rgba(122,183,255,.35) 70%, transparent);
  filter:blur(40px);opacity:.7;
}
.cover-logo-card{
  position:relative;width:min(420px,100%);aspect-ratio:752/120;
  display:flex;align-items:center;justify-content:center;
  background:#fff;border-radius:22px;padding:20px 26px;
  box-shadow:0 24px 70px rgba(0,5,30,.46), 0 0 0 1px rgba(255,255,255,.85);
}
.cover-logo-card::after{
  content:"";position:absolute;inset:-18px;border-radius:30px;
  border:1px solid rgba(122,183,255,.22);pointer-events:none;
}
.cover-logo-card img{width:100%;height:100%;object-fit:contain}

/* =================== BUTTONS =================== */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 20px;border-radius:14px;font-weight:600;font-size:15px;
  transition:transform .15s ease, box-shadow .2s ease, background .2s ease;
}
.btn-primary{background:var(--grad);color:#0b1226;box-shadow:0 8px 26px rgba(91,134,255,.35)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 32px rgba(91,134,255,.5)}
.btn-ghost{background:rgba(255,255,255,.06);border:1px solid var(--line-2);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}

/* =================== STATS =================== */
.quick-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:24px 0 8px;
}
.qs{
  background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;
}
.qs-num{font-size:clamp(26px,2.6vw,38px);font-weight:800;letter-spacing:-.01em;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.qs-lbl{font-size:13px;color:var(--text-muted);margin-top:6px;line-height:1.4}

/* =================== FEATURES =================== */
.features-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:8px 0 18px;
}
.feat{
  background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;display:flex;flex-direction:column;gap:12px;min-height:130px;
}
.feat-ico{
  width:36px;height:36px;border-radius:10px;display:grid;place-items:center;
  background:rgba(91,134,255,.16);color:var(--accent);font-weight:800;font-size:18px;
  border:1px solid rgba(122,183,255,.3);
}
.feat-t{font-size:14px;line-height:1.4;color:#fff}

/* =================== VALUE CARDS =================== */
.values{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:8px 0 12px}
.value-card{
  background:linear-gradient(180deg, rgba(91,134,255,.10), rgba(91,134,255,.02));
  border:1px solid rgba(122,183,255,.18);border-radius:var(--radius);
  padding:22px;display:flex;flex-direction:column;gap:12px;
}
.value-badge{
  display:inline-block;font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);font-weight:700;background:rgba(91,134,255,.16);
  padding:6px 10px;border-radius:999px;align-self:flex-start;
  border:1px solid rgba(122,183,255,.35);
}
.value-card p{margin:0;line-height:1.55;color:var(--text-muted)}

/* =================== ECO GRID (used for cards) =================== */
.eco-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:8px 0 12px}
.eco{
  background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  display:flex;flex-direction:column;gap:10px;
}
.eco-tag{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);font-weight:700}
.eco h4{font-size:17px;margin:0;font-weight:700;line-height:1.3}
.eco p{margin:0;color:var(--text-muted);line-height:1.55;font-size:14.5px}
.eco ul{margin:4px 0 0 0;padding-left:1em;color:var(--text-muted);font-size:14px;line-height:1.6}

/* =================== TIMELINE =================== */
.timeline{list-style:none;padding:0;margin:14px 0 8px;display:grid;gap:12px}
.tl-item{display:grid;grid-template-columns:84px 1fr;gap:18px;align-items:start}
.tl-year{
  font-size:22px;font-weight:800;color:var(--accent);
  background:rgba(91,134,255,.14);border:1px solid rgba(122,183,255,.30);
  border-radius:14px;padding:14px 12px;text-align:center;letter-spacing:.02em;
}
.tl-card{
  background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;
}
.tl-card h3{margin:0 0 6px;font-size:17px;font-weight:700;line-height:1.3}
.tl-card p{margin:0;color:var(--text-muted);line-height:1.5;font-size:14.5px}
.tl-highlight .tl-card{
  background:linear-gradient(135deg, rgba(91,134,255,.22), rgba(122,183,255,.08));
  border-color:rgba(122,183,255,.45);
}
.tl-highlight .tl-year{background:var(--grad);color:#0b1226;border-color:transparent}

/* =================== PRINCIPLES =================== */
.principles{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:8px 0 12px}
.prin{
  display:flex;align-items:flex-start;gap:14px;
  padding:16px 18px;border-radius:var(--radius);
  background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  border:1px solid var(--line);font-size:15px;line-height:1.5;color:var(--text-muted);
}
.prin b{color:#fff}
.prin-n{font-weight:800;color:var(--accent);min-width:30px;font-size:15px}

/* =================== CALLOUTS =================== */
.callout{
  margin:22px 0;padding:24px 28px;border-radius:var(--radius);
  background:linear-gradient(135deg, rgba(91,134,255,.22), rgba(122,183,255,.06));
  border:1px solid rgba(122,183,255,.35);
}
.callout-soft{
  background:linear-gradient(135deg, rgba(255,255,255,.06), rgba(255,255,255,.01));
  border:1px solid var(--line-2);
}
.callout-tag{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);font-weight:700;margin-bottom:10px}
.callout p{margin:0;line-height:1.6;color:#e9eeff;font-size:15.5px}

/* =================== MISSION PILL (used as 'key thesis') =================== */
.mission-pill{
  display:inline-block;font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--accent);font-weight:700;background:rgba(91,134,255,.16);
  padding:8px 14px;border-radius:999px;border:1px solid rgba(122,183,255,.35);
  margin:8px 0 14px;
}
.mission-quote{
  font-size:clamp(22px,2.4vw,32px);line-height:1.2;font-weight:700;
  margin:0 0 24px;max-width:25ch;letter-spacing:-.01em;
}

/* =================== DUO CARDS =================== */
.duo-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:8px 0 12px}
.duo{
  background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  border:1px solid var(--line);border-radius:var(--radius);padding:22px;
}
.duo-ico{
  width:36px;height:36px;border-radius:10px;display:grid;place-items:center;
  background:rgba(91,134,255,.16);color:var(--accent);font-weight:800;font-size:16px;
  border:1px solid rgba(122,183,255,.3);margin-bottom:10px;
}
.duo h4{margin:0 0 6px;font-size:18px;font-weight:700;line-height:1.3}
.duo p{margin:0;color:var(--text-muted);line-height:1.55;font-size:14.5px}

/* =================== TABLE (matrix) =================== */
.matrix-wrap{overflow-x:auto;margin:14px 0;border-radius:var(--radius);border:1px solid var(--line)}
.matrix{
  width:100%;border-collapse:collapse;
  background:linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.005));
  font-size:14.5px;
}
.matrix th,.matrix td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line)}
.matrix thead th{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:700;background:rgba(91,134,255,.10)}
.matrix tbody th{font-weight:700;color:#fff;width:180px}
.matrix tbody td{color:var(--text-muted)}
.matrix-total{background:rgba(91,134,255,.10)}
.matrix-total th, .matrix-total td{color:#fff;font-weight:600;border-top:1px solid rgba(122,183,255,.35)}

/* =================== REPORTS =================== */
.reports-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:16px 0 4px}
.report-card{
  background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;display:flex;flex-direction:column;transition:transform .2s, border-color .2s;
}
.report-card:hover{transform:translateY(-2px);border-color:rgba(122,183,255,.4)}
.report-card figure{margin:0;background:#0b1126;aspect-ratio:16/9;overflow:hidden;border-bottom:1px solid var(--line)}
.report-card figure img{width:100%;height:100%;object-fit:cover;object-position:center}
.report-body{padding:18px 20px;display:flex;flex-direction:column;gap:8px}
.report-tag{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:700}
.report-body h4{margin:0;font-size:17px;font-weight:700;line-height:1.3}
.report-body ul{margin:6px 0 0;padding-left:1.05em;color:var(--text-muted);font-size:14px;line-height:1.55}
.report-body ul li{margin:.25em 0}
.report-body ul li b{color:#fff}

/* =================== NAV CTA =================== */
.chapter-nav-cta{margin:34px 0 8px;display:flex;justify-content:flex-end;gap:10px}

/* =================== FINISH =================== */
#finish{padding-top:30px}
.finish-hero{
  background:linear-gradient(135deg, rgba(91,134,255,.22) 0%, rgba(122,183,255,.06) 100%);
  border:1px solid rgba(122,183,255,.3);
  border-radius:var(--radius-lg);
  padding:64px 48px;position:relative;overflow:hidden;
  text-align:center;
}
.finish-inner{max-width:720px;margin:0 auto}
.finish-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:30px 0}
.finish-stats div{
  background:rgba(255,255,255,.05);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;
}
.finish-stats strong{font-size:28px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;display:block;margin-bottom:6px}
.finish-stats span{font-size:13px;color:var(--text-muted);line-height:1.4}
.finish-cta{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-bottom:18px}
.finish-foot{margin-top:18px}

/* =================== QUIZ =================== */
.quiz-status{
  display:flex;align-items:center;gap:18px;
  padding:16px 18px;border-radius:var(--radius);
  background:rgba(91,134,255,.10);border:1px solid rgba(122,183,255,.25);
  margin:8px 0 22px;flex-wrap:wrap;
}
.qs-line{font-size:14px;color:#fff}
.qs-line span{color:var(--accent);font-weight:700}
.qs-bar{flex:1;min-width:160px;height:8px;background:rgba(255,255,255,.08);border-radius:999px;overflow:hidden}
#quizFill{height:100%;width:0%;background:var(--grad);transition:width .35s ease}

.quiz-container{display:grid;gap:14px}
.q{
  background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;
}
.q-head{display:flex;gap:14px;align-items:flex-start;margin-bottom:14px}
.q-n{
  font-size:13px;font-weight:800;color:var(--accent);
  background:rgba(91,134,255,.16);border:1px solid rgba(122,183,255,.35);
  border-radius:10px;padding:6px 10px;min-width:48px;text-align:center;letter-spacing:.04em;
}
.q-title{font-size:17px;font-weight:700;line-height:1.35;margin:0;flex:1}
.q-opts{display:grid;gap:8px}
.q-opt{
  display:flex;align-items:flex-start;gap:12px;padding:13px 16px;
  background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:12px;
  cursor:pointer;text-align:left;font-size:14.5px;line-height:1.4;color:#e7ecff;
  transition:.15s;
}
.q-opt:hover{background:rgba(255,255,255,.06);border-color:var(--line-2)}
.q-opt .marker{
  width:20px;height:20px;border-radius:50%;border:2px solid var(--line-2);
  flex:0 0 auto;margin-top:1px;display:grid;place-items:center;transition:.15s;
}
.q-opt.selected{background:rgba(91,134,255,.14);border-color:rgba(122,183,255,.45)}
.q-opt.selected .marker{border-color:var(--accent);background:var(--accent)}
.q-opt.selected .marker::after{content:"";width:8px;height:8px;border-radius:50%;background:#0b1226}

.q.checked .q-opt{cursor:default}
.q.checked .q-opt.correct{
  background:rgba(34,197,94,.12);border-color:rgba(34,197,94,.5);
}
.q.checked .q-opt.correct .marker{border-color:var(--success);background:var(--success)}
.q.checked .q-opt.wrong{
  background:rgba(239,68,68,.12);border-color:rgba(239,68,68,.5);
}
.q.checked .q-opt.wrong .marker{border-color:var(--danger);background:var(--danger)}
.q-feedback{
  margin-top:14px;padding:12px 14px;border-radius:10px;font-size:14px;line-height:1.5;
  display:none;color:#e7ecff;
}
.q.checked .q-feedback{display:block}
.q.checked.right .q-feedback{background:rgba(34,197,94,.10);border:1px solid rgba(34,197,94,.4)}
.q.checked.wrong .q-feedback{background:rgba(239,68,68,.10);border:1px solid rgba(239,68,68,.4)}

.quiz-actions{display:flex;justify-content:center;gap:12px;margin-top:24px;flex-wrap:wrap}

.quiz-result{
  margin-top:26px;padding:30px 28px;border-radius:var(--radius-lg);
  background:linear-gradient(135deg, rgba(91,134,255,.22), rgba(122,183,255,.06));
  border:1px solid rgba(122,183,255,.35);text-align:center;
}
.qr-score{display:flex;flex-direction:column;align-items:center;gap:6px;margin-bottom:14px}
.qr-num{font-size:48px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:-.02em}
.qr-lbl{font-size:14px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:700}
.qr-msg{font-size:16px;line-height:1.6;color:#e7ecff;max-width:60ch;margin:0 auto 14px}
.qr-meta{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;color:var(--text-muted);font-size:14px}
.qr-meta strong{color:#fff;font-weight:700;margin-right:6px}

/* =================== BOTTOM NAV =================== */
.bottom-nav{
  position:fixed;left:50%;bottom:18px;transform:translateX(-50%);
  display:flex;align-items:center;gap:8px;
  background:rgba(7,11,26,.85);border:1px solid var(--line-2);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-radius:999px;padding:6px;z-index:40;box-shadow:var(--shadow);
}
body[data-current-chapter="cover"] .bottom-nav{display:none}
.bn-btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:9px 16px;border-radius:999px;font-size:14px;font-weight:600;color:#fff;
  background:rgba(255,255,255,.05);transition:.15s;
}
.bn-btn:hover{background:rgba(255,255,255,.12)}
.bn-next{background:var(--grad);color:#0b1226}
.bn-next:hover{filter:brightness(1.05)}
.bn-current{font-size:12px;color:var(--text-muted);padding:0 12px;letter-spacing:.04em;white-space:nowrap}

/* =================== RESPONSIVE =================== */
@media (max-width: 1080px){
  .quick-stats,.features-grid{grid-template-columns:repeat(3,1fr)}
  .values,.eco-grid{grid-template-columns:repeat(2,1fr)}
  .reports-grid{grid-template-columns:repeat(2,1fr)}
  .cover-hero{grid-template-columns:1fr;padding:42px 32px}
  .cover-art{height:240px}
  .chapters-nav{display:none}
}
@media (max-width: 1280px){
  .chapters-nav{display:none}
}
@media (min-width: 1500px){
  .chapters-nav{display:flex}
}
@media (max-width: 760px){
  .topbar{padding:10px 14px;gap:10px}
  .brand-sub{display:none}
  .chapter{padding:60px 18px 44px}
  .quick-stats,.features-grid{grid-template-columns:repeat(2,1fr)}
  .values,.eco-grid,.duo-cards,.principles{grid-template-columns:1fr}
  .reports-grid{grid-template-columns:1fr}
  .tl-item{grid-template-columns:1fr;gap:8px}
  .tl-year{display:inline-block;padding:8px 14px}
  .finish-stats{grid-template-columns:1fr}
  .finish-hero{padding:38px 22px}
  .cover-hero{padding:32px 22px}
  .matrix th,.matrix td{padding:10px 12px;font-size:13.5px}
  .bn-current{display:none}
  .bottom-nav{bottom:10px}
  .progress-mini{display:none}
  .h-mega{font-size:28px}
  .h-xl{font-size:24px}
  .qr-num{font-size:38px}
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce){
  *{transition:none !important;animation:none !important}
}