/* ---------- theme: modern / course (default) ---------- */
:root,
html[data-theme-family="modern"][data-theme="light"]{
  --bg:#F3F5FA;
  --bg-alt:#E7EBF4;
  --card:#FFFFFF;
  --ink:#0B1E3B;
  --ink-soft:#3C4A63;
  --ink-faint:#6C7A94;
  --line:#D8DEEA;
  --accent:#0F5FD6;
  --accent-ink:#FFFFFF;
  --accent-soft:#DCE9FB;
  --leaf:#1B8A5A;
  --leaf-soft:#DBF2E5;
  --rust:#C23B34;
  --rust-soft:#FBDFDC;
  --navy:#0A2044;
  --navy-line:rgba(255,255,255,.12);
  --shadow:10,20,40;
  --radius:12px;
}
html[data-theme-family="modern"][data-theme="dark"]{
  --bg:#0B111E;
  --bg-alt:#111827;
  --card:#161F32;
  --ink:#E9EDF6;
  --ink-soft:#B4BECF;
  --ink-faint:#7C879C;
  --line:#26304A;
  --accent:#5C93F0;
  --accent-ink:#081124;
  --accent-soft:#1C2B4A;
  --leaf:#4FBE83;
  --leaf-soft:#152A20;
  --rust:#E8746A;
  --rust-soft:#2C1B1A;
  --navy:#050B18;
  --navy-line:rgba(255,255,255,.08);
  --shadow:0,0,0;
}

/* ---------- theme: legacy ---------- */
html[data-theme-family="legacy"][data-theme="light"]{
  --bg:#F8F5EE;
  --bg-alt:#F0EBDC;
  --card:#FFFFFF;
  --ink:#211E19;
  --ink-soft:#4A4436;
  --ink-faint:#7C7461;
  --line:#DDD5C0;
  --accent:#B8791A;
  --accent-ink:#FBF6EA;
  --accent-soft:#EFDDAF;
  --leaf:#3D6134;
  --leaf-soft:#DCE8D5;
  --rust:#AA3A2C;
  --rust-soft:#F1DAD4;
  --shadow:26,24,21;
  --radius:14px;
}
html[data-theme-family="legacy"][data-theme="dark"]{
  --bg:#14120E;
  --bg-alt:#1D1A13;
  --card:#1F1B14;
  --ink:#F1ECDE;
  --ink-soft:#C4BCA8;
  --ink-faint:#8D8570;
  --line:#39332A;
  --accent:#DDA84C;
  --accent-ink:#14120E;
  --accent-soft:#3C2E14;
  --leaf:#7FAE6C;
  --leaf-soft:#223020;
  --rust:#E08876;
  --rust-soft:#3A231F;
  --shadow:0,0,0;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  transition:background .3s ease, color .3s ease;
}
h1,h2,h3,h4{
  font-family:'Fraunces',Georgia,serif;
  font-weight:600;
  margin:0 0 .4em 0;
  letter-spacing:-0.01em;
}
html[data-theme-family="modern"] h1,
html[data-theme-family="modern"] h2,
html[data-theme-family="modern"] h3,
html[data-theme-family="modern"] h4{
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  font-weight:800;
  letter-spacing:-0.02em;
}
html[data-theme-family="modern"] .brand .brand-text-fallback,
html[data-theme-family="modern"] .brand-name .b1,
html[data-theme-family="modern"] .stat-chip .n,
html[data-theme-family="modern"] .q-text{
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  font-weight:800;
}
a{color:inherit;}
button{font-family:inherit;}
.mono{font-family:'IBM Plex Mono',monospace;}
.emoji{filter:grayscale(1) contrast(1.15);display:inline-block;}
::selection{background:var(--accent-soft);}
img{max-width:100%;}

.wrap{max-width:1080px;margin:0 auto;padding:0 24px;}

/* ---------- topbar ---------- */
header.topbar{
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 24px;max-width:1080px;margin:0 auto;
}
.brand{display:flex;align-items:center;gap:12px;cursor:pointer;user-select:none;background:none;border:none;padding:0;}
.brand img{height:36px;width:auto;object-fit:contain;display:block;}
.brand .brand-text-fallback{
  height:36px;width:36px;border-radius:8px;background:var(--ink);color:var(--bg);
  display:flex;align-items:center;justify-content:center;font-family:'Fraunces';font-weight:700;font-size:18px;
}
.brand-name{display:flex;flex-direction:column;line-height:1.1;text-align:left;}
.brand-name .b1{font-family:'Fraunces';font-weight:700;font-size:19px;}
.brand-name .b2{font-family:'IBM Plex Mono';font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint);}

nav.desktop-nav{display:flex;align-items:center;gap:2px;}
nav.desktop-nav button.navlink{
  background:none;border:none;color:var(--ink-soft);font-size:14px;font-weight:500;
  padding:9px 14px;border-radius:8px;cursor:pointer;transition:.2s;position:relative;
}
nav.desktop-nav button.navlink:hover{color:var(--ink);background:var(--bg-alt);}
nav.desktop-nav button.navlink.active{color:var(--ink);}
nav.desktop-nav button.navlink.active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;background:var(--accent);border-radius:2px;
}
.topbar-actions{display:flex;align-items:center;gap:8px;}
.icon-btn{
  background:var(--bg-alt);border:1px solid var(--line);width:38px;height:38px;border-radius:10px;
  display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:16px;color:var(--ink);
  transition:.2s;
}
.icon-btn:hover{border-color:var(--accent);}
.user-chip{
  display:flex;align-items:center;gap:8px;background:var(--bg-alt);border:1px solid var(--line);
  border-radius:20px;padding:6px 12px 6px 6px;cursor:pointer;font-size:13px;color:var(--ink);
}
.user-chip .avatar{
  width:24px;height:24px;border-radius:50%;background:var(--accent);color:var(--accent-ink);
  display:flex;align-items:center;justify-content:center;font-family:'IBM Plex Mono';font-weight:700;font-size:11px;
}
.hamburger{display:none;}
.mobile-nav{
  display:none;flex-direction:column;gap:2px;padding:10px 24px 16px;border-bottom:1px solid var(--line);
  background:var(--bg);
}
.mobile-nav.open{display:flex;}
.mobile-nav button{
  text-align:left;background:none;border:none;color:var(--ink-soft);font-size:15px;padding:11px 6px;
  border-bottom:1px solid var(--line);cursor:pointer;
}
.mobile-nav button:last-child{border-bottom:none;}
.mobile-nav button.active{color:var(--accent);font-weight:600;}

/* course theme: navy chrome */
html[data-theme-family="modern"] header.topbar{background:var(--navy);border-bottom:1px solid var(--navy-line);backdrop-filter:none;}
html[data-theme-family="modern"] .brand-name .b1{color:#fff;}
html[data-theme-family="modern"] .brand-name .b2{color:rgba(255,255,255,.62);}
html[data-theme-family="modern"] .brand .brand-text-fallback{background:#fff;color:var(--navy);}
html[data-theme-family="modern"] nav.desktop-nav button.navlink{color:rgba(255,255,255,.75);}
html[data-theme-family="modern"] nav.desktop-nav button.navlink:hover{color:#fff;background:rgba(255,255,255,.09);}
html[data-theme-family="modern"] nav.desktop-nav button.navlink.active{color:#fff;}
html[data-theme-family="modern"] .icon-btn{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.18);color:#fff;}
html[data-theme-family="modern"] .user-chip{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.18);color:#fff;}
html[data-theme-family="modern"] .mobile-nav{background:var(--navy);}
html[data-theme-family="modern"] .mobile-nav button{color:rgba(255,255,255,.8);border-bottom-color:var(--navy-line);}
html[data-theme-family="modern"] .mobile-nav button.active{color:#fff;}

main{min-height:70vh;}
.view{display:none;padding:44px 0 90px;animation:viewIn .5s ease both;}
.view.active{display:block;}
@keyframes viewIn{from{opacity:0;transform:translateY(10px);}to{opacity:1;transform:translateY(0);}}
@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important;}
}

footer{border-top:1px solid var(--line);padding:26px 24px;text-align:center;color:var(--ink-faint);font-size:13px;}

/* ---------- login ---------- */
.login-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;}
.login-card{
  width:100%;max-width:440px;background:var(--card);border:1px solid var(--line);border-radius:18px;
  padding:36px 32px;box-shadow:0 24px 60px -30px rgba(var(--shadow),.4);
}
.login-brand{display:flex;align-items:center;gap:12px;margin-bottom:22px;justify-content:center;}
.login-brand img{height:44px;}
.login-card h1{font-size:24px;text-align:center;}
.login-card > p.sub{color:var(--ink-soft);text-align:center;font-size:14px;margin-bottom:24px;}
.field-row{display:flex;gap:8px;margin-top:6px;}
.field-row input{
  flex:1;padding:12px 14px;border-radius:10px;border:1px solid var(--line);background:var(--bg-alt);
  color:var(--ink);font-size:14.5px;font-family:inherit;
}
.field-row input:focus{outline:2px solid var(--accent);outline-offset:1px;}
.user-list{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 20px;}
.user-pill{
  background:var(--bg-alt);border:1px solid var(--line);border-radius:20px;padding:8px 14px;font-size:13.5px;
  cursor:pointer;display:flex;align-items:center;gap:8px;transition:.15s;
}
.user-pill:hover{border-color:var(--accent);}
.user-pill .avatar{
  width:20px;height:20px;border-radius:50%;background:var(--accent);color:var(--accent-ink);
  display:flex;align-items:center;justify-content:center;font-family:'IBM Plex Mono';font-weight:700;font-size:10px;
}
.divider{display:flex;align-items:center;gap:10px;color:var(--ink-faint);font-size:12px;margin:20px 0 4px;text-transform:uppercase;letter-spacing:.08em;}
.divider::before,.divider::after{content:"";flex:1;height:1px;background:var(--line);}
.already-box{
  background:var(--bg-alt);border:1px solid var(--line);border-radius:12px;padding:18px;text-align:center;
}
.already-box .who{font-weight:600;font-size:16px;margin-bottom:12px;}
.switch-line{margin-top:14px;font-size:13px;color:var(--ink-soft);}
.switch-line button{background:none;border:none;color:var(--accent);font-weight:600;cursor:pointer;font-size:13px;padding:0;text-decoration:underline;}
.anon-line{margin-top:18px;padding-top:14px;border-top:1px dashed var(--line);text-align:center;}
.link-btn{background:none;border:none;color:var(--accent);font-weight:600;cursor:pointer;font-size:13.5px;padding:0;text-decoration:underline;}
.anon-notice{margin-top:8px;font-size:12px;color:var(--ink-faint);text-align:center;}
.anon-banner{
  max-width:960px;margin:0 auto 18px;padding:12px 18px;background:var(--accent-soft);border:1px solid var(--line);
  border-radius:10px;font-size:13.5px;color:var(--ink-soft);text-align:center;
}
.anon-banner button{background:none;border:none;color:var(--accent);font-weight:600;cursor:pointer;font-size:13.5px;padding:0;text-decoration:underline;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;background:var(--ink);color:var(--bg);
  border:none;padding:13px 22px;border-radius:10px;font-weight:600;font-size:14.5px;cursor:pointer;
  transition:transform .15s ease, opacity .15s ease;
}
.btn:hover{transform:translateY(-2px);opacity:.92;}
.btn.ghost{background:none;border:1px solid var(--line);color:var(--ink);}
.btn.full{width:100%;justify-content:center;}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;}

/* ---------- home / topics ---------- */
.hero{display:flex;gap:40px;align-items:center;padding:8px 0 32px;flex-wrap:wrap;}
.hero-text{flex:1 1 380px;}
.hero-text h1{font-size:clamp(30px,4.6vw,46px);line-height:1.08;max-width:14ch;}
.hero-text p{color:var(--ink-soft);max-width:50ch;font-size:16px;margin-bottom:22px;}
.hero-svg{flex:1 1 260px;max-width:320px;}

.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:10px;}
.stat-row{display:flex;gap:14px;flex-wrap:wrap;margin:10px 0 34px;}
.stat-chip{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 16px;min-width:110px;}
.stat-chip .n{font-family:'Fraunces';font-size:22px;font-weight:700;}
.stat-chip .l{font-size:11px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.06em;}

.progress-bar{height:7px;background:var(--bg-alt);border-radius:6px;overflow:hidden;}
.progress-bar-fill{height:100%;background:var(--leaf);border-radius:6px;transition:width .4s ease;}

.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;}
@media(max-width:720px){.card-grid{grid-template-columns:1fr;}}
.entity-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  cursor:pointer;transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;position:relative;overflow:hidden;
  text-align:left;
}
.entity-card:hover{transform:translateY(-4px);box-shadow:0 14px 30px -14px rgba(var(--shadow),.35);border-color:var(--accent);}
.entity-card .num{font-family:'IBM Plex Mono';font-size:12px;color:var(--ink-faint);}
.entity-card h3{font-size:21px;margin:8px 0 6px;}
.entity-card p{color:var(--ink-soft);font-size:14px;margin:0 0 14px;}
.entity-card .cta{font-size:13.5px;font-weight:600;color:var(--accent);display:flex;align-items:center;gap:6px;}
.entity-card .card-progress{margin-top:6px;margin-bottom:14px;}
.entity-card .card-progress .lbl{font-size:11px;color:var(--ink-faint);margin-bottom:5px;font-family:'IBM Plex Mono';}
.badge-stamp{position:absolute;top:16px;right:16px;width:48px;height:48px;}

/* ---------- course outline (modern theme home/topic) ---------- */
.course-progress-panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;margin:24px 0 30px;}
.cpp-top{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;flex-wrap:wrap;margin-bottom:14px;}
.cpp-label{font-family:'IBM Plex Mono';font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);margin-bottom:4px;}
.cpp-pct{font-size:34px;font-weight:800;line-height:1;}
.cpp-counters{display:flex;gap:22px;}
.cpp-counter{text-align:right;}
.cpp-counter .n{display:block;font-size:18px;font-weight:700;}
.cpp-counter .l{font-size:11px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.05em;}
.progress-bar.lg{height:11px;}

.continue-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--accent-soft);border:1px solid var(--accent);border-radius:var(--radius);padding:16px 20px;margin-bottom:26px;flex-wrap:wrap;}
.continue-bar .cb-label{font-family:'IBM Plex Mono';font-size:10.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);margin-bottom:3px;}
.continue-bar .cb-title{font-weight:700;font-size:16px;}

.course-outline{display:flex;flex-direction:column;gap:12px;}
.outline-row{display:flex;align-items:center;gap:18px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;cursor:pointer;text-align:left;width:100%;transition:.2s;}
.outline-row:hover{border-color:var(--accent);box-shadow:0 10px 24px -16px rgba(var(--shadow),.4);}
.outline-num{flex-shrink:0;width:40px;height:40px;border-radius:50%;background:var(--accent-soft);color:var(--ink);display:flex;align-items:center;justify-content:center;font-family:'IBM Plex Mono';font-weight:700;font-size:14px;}
.outline-row.is-complete .outline-num{background:var(--leaf-soft);color:var(--leaf);}
.outline-body{flex:1;min-width:0;}
.outline-title-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:4px;}
.outline-title-row h3{margin:0;font-size:17px;}
.status-badge{font-family:'IBM Plex Mono';font-size:10px;text-transform:uppercase;letter-spacing:.06em;padding:3px 9px;border-radius:20px;font-weight:700;flex-shrink:0;}
.status-badge.not-started{background:var(--bg-alt);color:var(--ink-faint);}
.status-badge.in-progress{background:var(--accent-soft);color:var(--accent);}
.status-badge.complete{background:var(--leaf-soft);color:var(--leaf);}
.outline-body p{margin:0 0 10px;color:var(--ink-soft);font-size:13.5px;}
.outline-progress{display:flex;align-items:center;gap:12px;}
.outline-progress .progress-bar{flex:1;}
.outline-count{font-size:11.5px;color:var(--ink-faint);white-space:nowrap;font-family:'IBM Plex Mono';}
.outline-chevron{flex-shrink:0;color:var(--ink-faint);font-size:18px;}

.module-list{display:flex;flex-direction:column;gap:10px;}
.module-row{display:flex;align-items:center;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;cursor:pointer;text-align:left;width:100%;transition:.2s;}
.module-row:hover{border-color:var(--accent);}
.module-row.is-done{border-color:var(--leaf-soft);}
.module-row-status{flex-shrink:0;width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--bg-alt);color:var(--ink-faint);font-family:'IBM Plex Mono';font-size:12px;font-weight:700;}
.module-row.is-done .module-row-status{background:var(--leaf-soft);color:var(--leaf);}
.module-row-body{flex:1;min-width:0;}
.module-row-title{font-weight:700;font-size:14.5px;margin-bottom:2px;}
.module-row-lede{font-size:13px;color:var(--ink-soft);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.module-row-meta{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.module-score{font-family:'IBM Plex Mono';font-size:11px;color:var(--leaf);}

.seq-nav{display:flex;gap:6px;flex-wrap:wrap;margin:0 0 26px;}
.seq-dot{width:34px;height:34px;border-radius:50%;border:1px solid var(--line);background:var(--card);display:flex;align-items:center;justify-content:center;font-family:'IBM Plex Mono';font-size:12px;color:var(--ink-faint);cursor:pointer;flex-shrink:0;padding:0;}
.seq-dot.current{border-color:var(--accent);color:var(--accent);font-weight:700;background:var(--accent-soft);}
.seq-dot.done{background:var(--leaf-soft);border-color:var(--leaf);color:var(--leaf);}

/* ---------- module content ---------- */
.back-link{
  background:none;border:none;color:var(--ink-soft);font-size:13.5px;cursor:pointer;
  display:inline-flex;align-items:center;gap:6px;margin-bottom:10px;font-weight:500;
}
.back-link:hover{color:var(--ink);}
.crumbs{color:var(--ink-faint);font-size:12.5px;margin-bottom:18px;font-family:'IBM Plex Mono';}
.module-hero{display:flex;gap:34px;align-items:center;flex-wrap:wrap;margin-bottom:26px;}
.module-hero-text{flex:1 1 360px;}
.module-hero-text h1{font-size:clamp(26px,4.2vw,40px);}
.module-hero-svg{flex:1 1 200px;max-width:220px;}
.lede{font-size:17px;color:var(--ink-soft);max-width:62ch;}

.content-block{display:flex;gap:30px;align-items:center;margin-bottom:30px;flex-wrap:wrap;}
.content-block.reverse{flex-direction:row-reverse;}
.content-text{flex:1 1 340px;}
.content-visual{flex:1 1 280px;max-width:360px;}
.content-text h2{font-size:23px;}
.content-text ul{margin:14px 0 0;padding-left:20px;}
.content-text li{margin-bottom:8px;color:var(--ink-soft);}
.content-text p{color:var(--ink-soft);}
.content-text strong{color:var(--ink);}
.callout{background:var(--accent-soft);border:1px solid var(--line);border-left:4px solid var(--accent);padding:16px 18px;border-radius:10px;margin-top:16px;font-size:14.5px;}
.callout.leaf{background:var(--leaf-soft);border-left-color:var(--leaf);}
.callout.rust{background:var(--rust-soft);border-left-color:var(--rust);}

.checklist{display:grid;gap:10px;margin-top:6px;}
.checklist .item{display:flex;gap:10px;align-items:flex-start;background:var(--card);border:1px solid var(--line);padding:12px 14px;border-radius:10px;font-size:14.5px;color:var(--ink-soft);}
.checklist .item .mark{color:var(--leaf);font-weight:700;flex-shrink:0;}

svg.diagram{width:100%;height:auto;display:block;}
.svg-stroke{stroke:var(--ink);fill:none;}
.svg-fill-ink{fill:var(--ink);}
.svg-fill-accent{fill:var(--accent);}
.svg-fill-soft{fill:var(--accent-soft);}
.svg-fill-leaf{fill:var(--leaf);}
.svg-fill-rust{fill:var(--rust);}
.svg-ink-soft{stroke:var(--ink-soft);fill:none;}
.svg-bg-card{fill:var(--card);}
.bar-rect{transition:height 1s cubic-bezier(.2,.8,.2,1), y 1s cubic-bezier(.2,.8,.2,1);}

.video-embed{
  position:relative;width:100%;padding-top:56.25%;border-radius:12px;overflow:hidden;border:1px solid var(--line);background:var(--bg-alt);
}
.video-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0;}
.video-caption{font-size:12.5px;color:var(--ink-faint);margin-top:8px;}
.video-caption a{color:var(--accent);text-decoration:underline;}

/* ---------- flashcards ---------- */
.flash-wrap{max-width:520px;margin:0 auto;}
.flash-card{perspective:1400px;height:260px;cursor:pointer;}
.flash-inner{position:relative;width:100%;height:100%;transition:transform .55s cubic-bezier(.3,.7,.3,1);transform-style:preserve-3d;}
.flash-card.flipped .flash-inner{transform:rotateY(180deg);}
.flash-face{
  position:absolute;inset:0;backface-visibility:hidden;border-radius:16px;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;text-align:center;padding:30px;
  background:var(--card);box-shadow:0 20px 40px -24px rgba(var(--shadow),.4);
}
.flash-face .lbl{position:absolute;top:14px;left:18px;font-family:'IBM Plex Mono';font-size:10.5px;letter-spacing:.12em;color:var(--ink-faint);text-transform:uppercase;}
.flash-face p{font-size:18px;font-weight:500;margin:0;}
.flash-back{transform:rotateY(180deg);background:var(--accent-soft);}
.flash-controls{display:flex;align-items:center;justify-content:space-between;margin-top:20px;}
.flash-dots{display:flex;gap:6px;flex-wrap:wrap;max-width:240px;justify-content:center;}
.dot{width:6px;height:6px;border-radius:50%;background:var(--line);}
.dot.seen{background:var(--accent);}
.flash-hint{text-align:center;color:var(--ink-faint);font-size:12.5px;margin-top:10px;}

/* ---------- quiz ---------- */
.quiz-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;max-width:640px;margin:0 auto;}
.quiz-progress{height:5px;background:var(--bg-alt);border-radius:6px;overflow:hidden;margin-bottom:22px;}
.quiz-progress-fill{height:100%;background:var(--accent);width:0;transition:width .4s ease;}
.q-title{font-family:'IBM Plex Mono';font-size:11.5px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.1em;margin-bottom:8px;display:flex;justify-content:space-between;}
.q-title button{background:none;border:none;color:var(--ink-faint);text-decoration:underline;cursor:pointer;font-family:inherit;font-size:11.5px;}
.q-text{font-size:18px;font-weight:600;margin-bottom:18px;font-family:'Fraunces';}
.q-options{display:grid;gap:10px;}
.q-option{
  text-align:left;background:var(--bg-alt);border:1px solid var(--line);border-radius:10px;padding:13px 15px;
  cursor:pointer;font-size:14.5px;transition:.15s;display:flex;gap:10px;align-items:center;color:var(--ink);
}
.q-option:hover{border-color:var(--accent);}
.q-option.correct{background:var(--leaf-soft);border-color:var(--leaf);}
.q-option.wrong{background:var(--rust-soft);border-color:var(--rust);}
.q-option.disabled{pointer-events:none;opacity:.85;}
.q-nav{display:flex;justify-content:space-between;margin-top:22px;}
.q-explain{font-size:13.5px;color:var(--ink-soft);margin-top:14px;background:var(--bg-alt);padding:12px 14px;border-radius:10px;display:none;}
.q-explain.show{display:block;}
.quiz-intro{text-align:center;padding:10px 0;}
.quiz-intro p{color:var(--ink-soft);max-width:50ch;margin:10px auto 20px;}
.quiz-result{text-align:center;padding:20px 0;}
.stamp-badge{width:130px;height:130px;margin:0 auto 18px;animation:stampIn .5s cubic-bezier(.2,1.4,.4,1) both;}
@keyframes stampIn{from{transform:scale(.4) rotate(-14deg);opacity:0;}to{transform:scale(1) rotate(-8deg);opacity:1;}}
.quiz-result h3{font-size:26px;}
.quiz-result .score{font-family:'IBM Plex Mono';font-size:15px;color:var(--ink-soft);margin-bottom:18px;}

/* ---------- settings ---------- */
.settings-tabs{display:flex;gap:8px;margin-bottom:26px;border-bottom:1px solid var(--line);flex-wrap:wrap;}
.settings-tab{background:none;border:none;padding:10px 4px;margin-right:18px;font-size:14.5px;color:var(--ink-faint);cursor:pointer;border-bottom:2px solid transparent;font-weight:500;}
.settings-tab.active{color:var(--ink);border-color:var(--accent);}
.settings-pane{display:none;}
.settings-pane.active{display:block;animation:viewIn .35s ease both;}
.settings-pane h2{font-size:22px;margin-top:26px;}
.settings-pane h2:first-child{margin-top:0;}
.settings-pane p{color:var(--ink-soft);max-width:66ch;}
.settings-row{
  display:flex;align-items:center;justify-content:space-between;background:var(--card);border:1px solid var(--line);
  border-radius:12px;padding:16px 18px;margin-top:16px;flex-wrap:wrap;gap:10px;
}
.theme-select{
  appearance:none;-webkit-appearance:none;background:var(--bg-alt);border:1px solid var(--line);border-radius:9px;
  padding:10px 36px 10px 14px;font-size:13.5px;font-weight:600;color:var(--ink);cursor:pointer;font-family:inherit;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='none' stroke='%236C7A94' stroke-width='2'%3E%3Cpath d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 10px center;background-size:16px;
}
.theme-select:focus{outline:2px solid var(--accent);outline-offset:1px;}
.toggle{width:48px;height:27px;background:var(--bg-alt);border:1px solid var(--line);border-radius:20px;position:relative;cursor:pointer;flex-shrink:0;}
.toggle::after{content:"";position:absolute;top:2px;left:2px;width:21px;height:21px;border-radius:50%;background:var(--ink);transition:.25s;}
html[data-theme="dark"] .toggle::after{transform:translateX(21px);background:var(--accent);}
.danger-btn{background:none;border:1px solid var(--rust);color:var(--rust);padding:10px 16px;border-radius:9px;font-size:13.5px;cursor:pointer;font-weight:600;}
.danger-btn:hover{background:var(--rust-soft);}
.danger-btn:disabled{opacity:.5;cursor:not-allowed;}
.danger-btn:disabled:hover{background:none;}
.steps-list{counter-reset:step;list-style:none;padding:0;margin-top:18px;}
.steps-list li{counter-increment:step;position:relative;padding:14px 0 14px 46px;border-bottom:1px solid var(--line);color:var(--ink-soft);}
.steps-list li::before{
  content:counter(step);position:absolute;left:0;top:12px;width:30px;height:30px;border-radius:50%;
  background:var(--accent-soft);color:var(--ink);font-family:'IBM Plex Mono';font-size:13px;font-weight:600;
  display:flex;align-items:center;justify-content:center;
}
.steps-list li strong{color:var(--ink);display:block;margin-bottom:2px;}

.eyebrow{
  font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);
  font-weight:600;display:inline-flex;align-items:center;gap:8px;margin-bottom:10px;
}
.tags{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px;}
.tag{font-family:'IBM Plex Mono';font-size:10.5px;background:var(--bg-alt);border:1px solid var(--line);padding:3px 8px;border-radius:20px;color:var(--ink-soft);}

@media(max-width:860px){
  nav.desktop-nav{display:none;}
  .hamburger{display:flex;}
  .content-block,.content-block.reverse{flex-direction:column;}
  .module-hero{flex-direction:column;text-align:center;}
  .module-hero-text{text-align:left;}
}