/* ============================================================
   AMERICAN MUSIC HISTORY & LISTENING — Interactive Course
   A 250th Anniversary celebration of American sound
   Design system: vintage Americana poster × modern web
   ============================================================ */

:root{
  --navy:#16213e;
  --navy-deep:#0e1730;
  --navy-soft:#1f2d52;
  --gold:#d4a437;
  --gold-bright:#e9bd55;
  --gold-soft:#f0d9a3;
  --red:#b3382e;
  --red-bright:#d04a3f;
  --cream:#f7f1e1;
  --paper:#fdfaf2;
  --ink:#241f1a;
  --ink-soft:#5a5247;
  --line:#e4dac2;
  --accent:#d4a437;            /* overridden per unit */
  --accent-soft:#f3e3bd;
  --shadow:0 10px 30px rgba(14,23,48,.18);
  --shadow-sm:0 4px 14px rgba(14,23,48,.12);
  --radius:14px;
  --font-display:"Fraunces","Georgia",serif;
  --font-body:"Inter",-apple-system,"Segoe UI",Roboto,sans-serif;
}

body.unit1{--accent:#d4a437;--accent-soft:#f3e3bd}
body.unit2{--accent:#5b7553;--accent-soft:#dde7d6}
body.unit3{--accent:#8e3b46;--accent-soft:#efd7da}
body.unit4{--accent:#6b4fa0;--accent-soft:#e3dbf2}
body.unit5{--accent:#2e7d82;--accent-soft:#d3eaeb}
body.unit6{--accent:#c0392b;--accent-soft:#f5d9d5}
body.unit7{--accent:#c2317e;--accent-soft:#f6d8e8}
body.unit8{--accent:#2f6fb3;--accent-soft:#d7e6f5}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  background-image:
    radial-gradient(rgba(212,164,55,.05) 1px, transparent 1.4px);
  background-size:26px 26px;
  line-height:1.6;
}
img,svg{max-width:100%;display:block}
a{color:var(--accent);}
button{font-family:inherit;cursor:pointer}

h1,h2,h3,h4{font-family:var(--font-display);color:var(--navy);line-height:1.15;font-weight:700}

.wrap{max-width:1120px;margin:0 auto;padding:0 22px}

/* ---------- Top navigation ---------- */
.topnav{
  position:sticky;top:0;z-index:90;
  background:rgba(14,23,48,.97);
  border-bottom:3px solid var(--gold);
  backdrop-filter:blur(6px);
}
.topnav .wrap{display:flex;align-items:center;gap:14px;padding:10px 22px}
.brand{display:flex;align-items:center;gap:10px;color:var(--cream);text-decoration:none;flex-shrink:0}
.brand .star{width:26px;height:26px}
.brand b{font-family:var(--font-display);font-size:1.02rem;letter-spacing:.02em}
.brand small{display:block;font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;color:var(--gold-bright)}
.navunits{display:flex;gap:5px;margin-left:auto;flex-wrap:wrap}
.navunits a{
  display:block;width:30px;height:30px;border-radius:8px;
  text-align:center;line-height:30px;font-size:.82rem;font-weight:700;
  color:var(--cream);text-decoration:none;border:1px solid rgba(247,241,225,.25);
}
.navunits a:hover{background:rgba(212,164,55,.25)}
.navunits a.here{background:var(--gold);color:var(--navy);border-color:var(--gold)}
.navunits a.done{border-color:var(--gold);color:var(--gold-bright)}
.navxp{color:var(--gold-bright);font-size:.78rem;font-weight:700;margin-left:10px;white-space:nowrap}

/* ---------- Hero ---------- */
.hero{
  position:relative;color:var(--cream);
  background:linear-gradient(160deg,var(--navy-deep) 0%,var(--navy) 55%,#23315c 100%);
  overflow:hidden;
}
.hero .glow{position:absolute;inset:auto -10% -40% -10%;height:70%;
  background:radial-gradient(ellipse at center,rgba(212,164,55,.28),transparent 65%);}
.hero .wrap{position:relative;padding:64px 22px 50px;display:grid;grid-template-columns:1.15fr .85fr;gap:34px;align-items:center}
.hero h1{color:var(--cream);font-size:clamp(2rem,4.6vw,3.4rem);margin:.35em 0 .3em}
.hero h1 em{font-style:italic;color:var(--gold-bright)}
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.72rem;font-weight:700;letter-spacing:.22em;text-transform:uppercase;
  color:var(--gold-bright);border:1px solid rgba(212,164,55,.5);
  padding:6px 14px;border-radius:99px;background:rgba(212,164,55,.08)
}
.kicker .dot{width:6px;height:6px;border-radius:50%;background:var(--red-bright)}
.hero p.lead{font-size:1.06rem;color:#e8e2cf;max-width:54ch}
.hero .art{filter:drop-shadow(0 18px 30px rgba(0,0,0,.35))}
.hero .cta-row{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap}

.btn{
  display:inline-flex;align-items:center;gap:9px;
  background:var(--gold);color:var(--navy-deep);
  font-weight:800;font-size:.95rem;text-decoration:none;
  padding:13px 24px;border-radius:11px;border:none;
  box-shadow:0 6px 0 rgba(0,0,0,.22);
  transition:transform .12s ease, box-shadow .12s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(2px);box-shadow:0 2px 0 rgba(0,0,0,.22)}
.btn.ghost{background:transparent;color:var(--cream);border:2px solid rgba(247,241,225,.5);box-shadow:none}
.btn.ghost:hover{border-color:var(--gold);color:var(--gold-bright)}
.btn.small{padding:8px 16px;font-size:.84rem;box-shadow:0 4px 0 rgba(0,0,0,.18)}
.btn.accent{background:var(--accent);color:#fff}
.btn[disabled]{opacity:.45;cursor:not-allowed;transform:none}

/* ---------- Sections ---------- */
section.block{padding:58px 0}
section.block.tint{background:linear-gradient(180deg,rgba(212,164,55,.07),transparent 70%)}
.sec-head{display:flex;align-items:baseline;gap:16px;margin-bottom:8px;flex-wrap:wrap}
.stepnum{
  font-family:var(--font-display);font-weight:800;font-size:.85rem;
  background:var(--navy);color:var(--gold-bright);
  padding:6px 13px;border-radius:99px;letter-spacing:.12em;text-transform:uppercase;
  white-space:nowrap;
}
.sec-head h2{font-size:clamp(1.5rem,3vw,2.2rem)}
.sec-sub{color:var(--ink-soft);max-width:72ch;margin-bottom:26px;font-size:1.0rem}
.rule{height:3px;background:linear-gradient(90deg,var(--accent),transparent);border:none;margin:10px 0 22px;max-width:340px}

/* ---------- Era scene + hotspots ---------- */
.scene-frame{
  position:relative;border-radius:var(--radius);overflow:hidden;
  border:6px solid var(--navy);box-shadow:var(--shadow);
  background:var(--navy-deep);
}
.scene-frame svg{width:100%;height:auto;display:block}
.scene-caption{
  display:flex;justify-content:space-between;align-items:center;gap:10px;
  background:var(--navy);color:var(--cream);padding:10px 18px;font-size:.85rem;
}
.scene-caption b{color:var(--gold-bright);font-family:var(--font-display)}
.spot-progress{color:var(--gold-soft);font-weight:700;white-space:nowrap}

.hotspot{cursor:pointer}
.hotspot circle.ring{
  fill:rgba(212,164,55,.16);stroke:var(--gold-bright);stroke-width:2;
  animation:pulse 2.2s infinite;
  transform-origin:center;transform-box:fill-box;
}
.hotspot circle.core{fill:var(--gold);stroke:var(--navy-deep);stroke-width:2}
.hotspot text{
  font-family:var(--font-body);font-weight:800;font-size:15px;fill:var(--navy-deep);
  text-anchor:middle;dominant-baseline:central;pointer-events:none;
}
.hotspot.visited circle.core{fill:#8fb582}
.hotspot.visited circle.ring{animation:none;stroke:#8fb582;fill:rgba(143,181,130,.15)}
.hotspot:hover circle.core{fill:var(--gold-bright)}
@keyframes pulse{0%{transform:scale(1);opacity:1}70%{transform:scale(1.8);opacity:0}100%{transform:scale(1.8);opacity:0}}

/* hotspot card modal */
.modal-veil{
  position:fixed;inset:0;background:rgba(14,23,48,.66);z-index:120;
  display:flex;align-items:center;justify-content:center;padding:20px;
  opacity:0;pointer-events:none;transition:opacity .2s;
}
.modal-veil.open{opacity:1;pointer-events:auto}
.modal-card{
  background:var(--paper);max-width:560px;width:100%;border-radius:16px;
  border-top:8px solid var(--accent);box-shadow:var(--shadow);
  padding:30px 32px;position:relative;max-height:86vh;overflow:auto;
  transform:translateY(14px);transition:transform .2s;
}
.modal-veil.open .modal-card{transform:translateY(0)}
.modal-card .closer{
  position:absolute;top:12px;right:14px;background:none;border:none;
  font-size:1.5rem;color:var(--ink-soft);line-height:1;
}
.modal-card .spot-icon{font-size:2rem;line-height:1;margin-bottom:6px}
.modal-card h3{font-size:1.45rem;margin-bottom:2px}
.modal-card .spot-sub{color:var(--accent);font-weight:700;font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;margin-bottom:14px}
.modal-card p{margin-bottom:12px}
.listen-thread{
  background:var(--accent-soft);border-left:4px solid var(--accent);
  padding:12px 16px;border-radius:0 10px 10px 0;font-size:.94rem;
}
.listen-thread b{color:var(--navy)}

/* ---------- Threads of the Sound ---------- */
.threads{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px;margin-top:8px}
.thread{
  border-radius:12px;padding:16px 18px;color:var(--cream);
  background:var(--navy);border-left:6px solid var(--tc,var(--gold));
  box-shadow:var(--shadow-sm);
}
.thread b{display:block;font-family:var(--font-display);color:var(--gold-soft);font-size:1.02rem;margin-bottom:4px}
.thread span{font-size:.88rem;color:#ded8c6}

/* ---------- Listening room ---------- */
.listen-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
@media(max-width:880px){.listen-grid{grid-template-columns:1fr}}
.track-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;
}
.track-top{display:flex;gap:14px;padding:16px 18px 10px;align-items:flex-start}
.track-num{
  font-family:var(--font-display);font-weight:800;font-size:1.05rem;flex-shrink:0;
  width:40px;height:40px;border-radius:50%;background:var(--navy);color:var(--gold-bright);
  display:flex;align-items:center;justify-content:center;
}
.track-top h3{font-size:1.12rem;line-height:1.25}
.track-top .meta{color:var(--ink-soft);font-size:.86rem}
.tag{
  display:inline-block;font-size:.68rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;
  background:var(--accent-soft);color:var(--navy);padding:3px 10px;border-radius:99px;margin-top:6px;
}
.player-slot{position:relative;background:var(--navy-deep);aspect-ratio:16/9}
.player-slot iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.player-load{
  position:absolute;inset:0;width:100%;border:none;padding:0;cursor:pointer;
  background-size:cover;background-position:center;display:block;
}
.player-load .shade{position:absolute;inset:0;background:linear-gradient(rgba(14,23,48,.25),rgba(14,23,48,.55))}
.player-load .playbtn{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:64px;height:46px;background:var(--red-bright);border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 6px 18px rgba(0,0,0,.45);transition:transform .15s;
}
.player-load:hover .playbtn{transform:translate(-50%,-50%) scale(1.08)}
.player-load .playbtn::after{content:"";border-style:solid;border-width:9px 0 9px 16px;border-color:transparent transparent transparent #fff}
.player-load .hint{position:absolute;bottom:8px;left:0;right:0;text-align:center;color:#fff;font-size:.72rem;letter-spacing:.06em;text-shadow:0 1px 4px rgba(0,0,0,.7)}
.track-body{padding:14px 18px 18px;display:flex;flex-direction:column;gap:10px;flex:1}
.why{font-size:.92rem;color:var(--ink-soft)}
.why b{color:var(--navy)}
.listenfor{background:var(--accent-soft);border-radius:10px;padding:10px 14px;font-size:.9rem}
.listenfor b{display:block;font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--navy);margin-bottom:3px}
.track-foot{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:auto;padding-top:4px;flex-wrap:wrap}
.yt-alt{font-size:.78rem;color:var(--ink-soft)}
.heardbtn{
  border:2px solid var(--accent);background:#fff;color:var(--navy);
  font-weight:700;font-size:.82rem;border-radius:99px;padding:7px 15px;
  transition:all .15s;
}
.heardbtn.on{background:var(--accent);color:#fff}

/* ---------- Sound Lab ---------- */
.lab{
  background:var(--navy-deep);border-radius:var(--radius);color:var(--cream);
  padding:28px 28px 24px;box-shadow:var(--shadow);
  border:1px solid rgba(212,164,55,.3);
}
.lab h3{color:var(--gold-bright);font-size:1.4rem;margin-bottom:4px}
.lab .lab-intro{color:#cfc9b8;font-size:.95rem;max-width:70ch;margin-bottom:18px}
.lab-controls{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:18px}
.lab-controls .btn{box-shadow:none}
.slider-box{display:flex;align-items:center;gap:9px;background:var(--navy-soft);padding:8px 14px;border-radius:10px;font-size:.82rem;font-weight:700}
.slider-box input[type=range]{accent-color:var(--gold);width:120px}
.slider-box output{color:var(--gold-bright);min-width:46px;text-align:right}
.preset-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.preset{
  background:var(--navy-soft);border:1px solid rgba(212,164,55,.35);color:var(--cream);
  border-radius:99px;padding:7px 16px;font-size:.82rem;font-weight:700;
}
.preset.on{background:var(--gold);color:var(--navy-deep);border-color:var(--gold)}
.preset-desc{font-size:.86rem;color:var(--gold-soft);margin-bottom:14px;min-height:1.4em}
.seq{display:flex;flex-direction:column;gap:7px;overflow-x:auto;padding-bottom:6px}
.seq-row{display:flex;align-items:center;gap:7px}
.seq-label{width:86px;flex-shrink:0;font-size:.74rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--gold-soft);display:flex;align-items:center;gap:6px}
.mutebtn{width:17px;height:17px;border-radius:4px;border:1px solid var(--gold-soft);background:transparent;padding:0;flex-shrink:0}
.mutebtn.off{background:#5a3030;border-color:#a55}
.cell{
  width:34px;height:34px;border-radius:7px;border:1px solid rgba(247,241,225,.22);
  background:rgba(247,241,225,.06);flex-shrink:0;padding:0;
  transition:background .1s;
}
.cell:nth-child(4n+2){border-left:2px solid rgba(212,164,55,.45)}
.cell.on{background:var(--gold);border-color:var(--gold-bright)}
.cell.note2.on{background:#7fb2d8}
.cell.playing{outline:3px solid var(--red-bright);outline-offset:-1px}
.lab-challenge{
  margin-top:18px;background:rgba(212,164,55,.1);border:1px dashed var(--gold);
  border-radius:12px;padding:14px 18px;font-size:.92rem;
  display:flex;gap:14px;align-items:center;justify-content:space-between;flex-wrap:wrap;
}
.lab-challenge b{color:var(--gold-bright)}
.lab-note{font-size:.78rem;color:#9aa3bf;margin-top:12px}

/* ---------- DACE builder ---------- */
.dace{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);overflow:hidden}
.dace-stage{padding:24px 28px;border-bottom:1px solid var(--line)}
.dace-stage:last-child{border-bottom:none}
.dace-stage h4{display:flex;align-items:center;gap:10px;font-size:1.06rem;margin-bottom:6px}
.dace-letter{
  width:34px;height:34px;border-radius:9px;background:var(--navy);color:var(--gold-bright);
  font-family:var(--font-display);font-weight:800;font-size:1.1rem;
  display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;
}
.dace-stage.locked{opacity:.45;pointer-events:none;background:repeating-linear-gradient(45deg,transparent,transparent 12px,rgba(0,0,0,.022) 12px,rgba(0,0,0,.022) 24px)}
.dace-stage p.tip{font-size:.88rem;color:var(--ink-soft);margin-bottom:12px}
.chips{display:flex;gap:9px;flex-wrap:wrap}
.chip{
  border:2px solid var(--line);background:var(--paper);border-radius:99px;
  padding:8px 16px;font-size:.88rem;font-weight:600;color:var(--ink);
  transition:all .12s;
}
.chip:hover{border-color:var(--accent)}
.chip.on{background:var(--accent);border-color:var(--accent);color:#fff}
.dace-out{
  margin:0 28px 24px;background:var(--accent-soft);border-radius:12px;padding:18px 22px;
  font-size:1.0rem;border-left:5px solid var(--accent);
}
.dace-out .placeholder{color:var(--ink-soft);font-style:italic}
.dace-out textarea{
  width:100%;min-height:90px;border:1px dashed var(--accent);border-radius:8px;
  font-family:inherit;font-size:.95rem;padding:10px 12px;margin-top:10px;background:#fffdf6;
}
.dace-foot{display:flex;align-items:center;gap:14px;padding:0 28px 24px;flex-wrap:wrap}
.sample-reveal{font-size:.92rem;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin:0 28px 24px;display:none}
.sample-reveal.open{display:block}
.sample-reveal b{color:var(--navy)}

/* ---------- Quiz ---------- */
.quiz{display:flex;flex-direction:column;gap:18px}
.qcard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px;box-shadow:var(--shadow-sm)}
.qcard h4{font-size:1.04rem;margin-bottom:14px;display:flex;gap:10px}
.qcard h4 .qn{color:var(--accent);font-family:var(--font-display);flex-shrink:0}
.opts{display:grid;gap:9px}
.opt{
  text-align:left;border:2px solid var(--line);background:var(--paper);
  border-radius:10px;padding:11px 16px;font-size:.93rem;transition:all .12s;
}
.opt:hover:not([disabled]){border-color:var(--accent)}
.opt.correct{border-color:#3e7d3e;background:#e7f2e4;font-weight:700}
.opt.wrong{border-color:#b3382e;background:#f7e2df}
.explain{display:none;margin-top:12px;font-size:.9rem;background:var(--accent-soft);border-radius:9px;padding:11px 15px}
.explain.show{display:block}
.quiz-score{
  background:var(--navy);color:var(--cream);border-radius:var(--radius);
  padding:22px 28px;display:flex;align-items:center;gap:18px;justify-content:space-between;flex-wrap:wrap;
}
.quiz-score b{color:var(--gold-bright);font-size:1.3rem;font-family:var(--font-display)}

/* ---------- Project ---------- */
.project{
  background:linear-gradient(150deg,var(--navy) 0%,var(--navy-soft) 100%);
  color:var(--cream);border-radius:var(--radius);padding:34px 36px;box-shadow:var(--shadow);
  border:1px solid rgba(212,164,55,.35);
}
.project h3{color:var(--gold-bright);font-size:1.6rem;margin-bottom:6px}
.project .proj-sub{color:#d8d2c0;margin-bottom:20px;max-width:70ch}
.proj-cols{display:grid;grid-template-columns:1.2fr .8fr;gap:28px}
@media(max-width:820px){.proj-cols{grid-template-columns:1fr}}
.proj-steps{display:flex;flex-direction:column;gap:11px}
.proj-step{display:flex;gap:12px;align-items:flex-start;background:rgba(247,241,225,.06);border-radius:10px;padding:12px 16px}
.proj-step input[type=checkbox]{margin-top:4px;accent-color:var(--gold);width:17px;height:17px;flex-shrink:0}
.proj-step span{font-size:.94rem}
.proj-aside{background:rgba(212,164,55,.1);border:1px solid rgba(212,164,55,.4);border-radius:12px;padding:18px 20px;font-size:.9rem;height:fit-content}
.proj-aside b{color:var(--gold-bright);display:block;margin-bottom:8px;font-family:var(--font-display)}
.proj-aside ul{padding-left:18px;display:flex;flex-direction:column;gap:6px}

/* ---------- Progress & badges ---------- */
.unit-progress{
  position:sticky;bottom:14px;z-index:80;margin:30px auto 14px;max-width:1120px;padding:0 22px;
}
.unit-progress .bar-wrap{
  background:var(--navy);border-radius:99px;padding:9px 20px;color:var(--cream);
  display:flex;align-items:center;gap:14px;box-shadow:var(--shadow);
  border:1px solid rgba(212,164,55,.5);font-size:.82rem;font-weight:700;
}
.minibar{flex:1;height:10px;background:rgba(247,241,225,.15);border-radius:99px;overflow:hidden}
.minibar i{display:block;height:100%;background:linear-gradient(90deg,var(--gold),var(--gold-bright));border-radius:99px;transition:width .4s}
.badge-pop{
  position:fixed;top:0;left:0;right:0;bottom:0;z-index:200;display:none;
  align-items:center;justify-content:center;background:rgba(14,23,48,.78);
}
.badge-pop.show{display:flex}
.badge-card{
  background:var(--paper);border-radius:20px;padding:44px 50px;text-align:center;max-width:430px;
  border:4px solid var(--gold);box-shadow:0 30px 80px rgba(0,0,0,.5);
}
.badge-card .medal{font-size:4rem;line-height:1;margin-bottom:10px}
.badge-card h3{font-size:1.6rem;margin-bottom:6px}
.badge-card p{color:var(--ink-soft);margin-bottom:20px}

.toast-rack{position:fixed;right:18px;bottom:18px;z-index:150;display:flex;flex-direction:column;gap:8px}
.toast{
  background:var(--navy);color:var(--gold-bright);font-weight:800;font-size:.86rem;
  border-radius:10px;padding:11px 18px;box-shadow:var(--shadow);
  border-left:4px solid var(--gold);animation:toastIn .25s ease;
}
@keyframes toastIn{from{transform:translateX(30px);opacity:0}to{transform:none;opacity:1}}

/* confetti */
.confetti{position:fixed;top:-12px;z-index:210;width:10px;height:16px;pointer-events:none;animation:fall linear forwards}
@keyframes fall{to{transform:translateY(105vh) rotate(720deg);opacity:.9}}

/* ---------- Home page specifics ---------- */
.dace-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.dcard{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  border-top:7px solid var(--dc,var(--gold));box-shadow:var(--shadow-sm);cursor:pointer;
  transition:transform .15s;
}
.dcard:hover{transform:translateY(-4px)}
.dcard h3{font-size:1.2rem;display:flex;gap:10px;align-items:center}
.dcard .big{font-family:var(--font-display);font-size:2rem;color:var(--dc,var(--gold))}
.dcard p{font-size:.9rem;color:var(--ink-soft);margin-top:8px}
.dcard .demo{display:none;margin-top:12px;font-size:.88rem;background:var(--paper);border-radius:9px;padding:11px 14px;border:1px dashed var(--dc,var(--gold))}
.dcard.open .demo{display:block}

.unit-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}
.ucard{
  position:relative;display:block;text-decoration:none;color:var(--cream);
  border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);
  background:var(--navy);transition:transform .16s ease, box-shadow .16s ease;
  border:1px solid rgba(212,164,55,.25);
}
.ucard:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.ucard .uart{height:118px;background:var(--uc,var(--gold));position:relative;overflow:hidden}
.ucard .uart svg{position:absolute;inset:0;width:100%;height:100%}
.ucard .ubody{padding:16px 18px 18px}
.ucard .ulabel{font-size:.66rem;font-weight:800;letter-spacing:.2em;text-transform:uppercase;color:var(--gold-bright)}
.ucard h3{color:var(--cream);font-size:1.22rem;margin:.2em 0 .35em}
.ucard p{font-size:.84rem;color:#c9c3b2;min-height:3em}
.ucard .ubar{height:7px;background:rgba(247,241,225,.14);border-radius:99px;overflow:hidden;margin-top:12px}
.ucard .ubar i{display:block;height:100%;background:var(--gold);border-radius:99px}
.ucard .ustat{display:flex;justify-content:space-between;font-size:.72rem;color:var(--gold-soft);margin-top:6px;font-weight:700}
.ucard .medal-mini{position:absolute;top:10px;right:12px;font-size:1.5rem;filter:drop-shadow(0 2px 4px rgba(0,0,0,.4))}

.river-wrap{background:var(--navy-deep);border-radius:var(--radius);padding:10px;box-shadow:var(--shadow);border:1px solid rgba(212,164,55,.3)}
.river-legend{display:flex;gap:14px;flex-wrap:wrap;padding:12px 16px 8px;justify-content:center}
.river-legend span{display:inline-flex;align-items:center;gap:7px;color:var(--cream);font-size:.78rem;font-weight:600}
.river-legend i{width:14px;height:14px;border-radius:4px;display:inline-block}

.phase-table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);font-size:.92rem}
.phase-table th{background:var(--navy);color:var(--gold-bright);text-align:left;padding:13px 18px;font-family:var(--font-display);letter-spacing:.04em}
.phase-table td{padding:13px 18px;border-bottom:1px solid var(--line);vertical-align:top}
.phase-table tr:last-child td{border-bottom:none}
.phase-table .pill{display:inline-block;background:var(--accent-soft);border-radius:99px;padding:2px 11px;font-size:.78rem;font-weight:700;color:var(--navy);margin:2px 3px 2px 0}
.phase-table .pill.off{background:#eee;color:#999;text-decoration:line-through}

.teacher-strip{background:var(--navy);color:#d8d2c0;border-radius:var(--radius);padding:26px 30px;display:flex;gap:22px;align-items:center;flex-wrap:wrap;justify-content:space-between}
.teacher-strip b{color:var(--gold-bright);font-family:var(--font-display);font-size:1.1rem}
.teacher-strip p{font-size:.9rem;max-width:62ch}

/* ---------- Unit hero ---------- */
.unit-hero{position:relative;color:var(--cream);background:linear-gradient(160deg,var(--navy-deep),var(--navy) 70%);overflow:hidden}
.unit-hero .wrap{position:relative;padding:54px 22px 40px}
.unit-hero .unit-tag{font-size:.72rem;font-weight:800;letter-spacing:.24em;text-transform:uppercase;color:var(--gold-bright)}
.unit-hero h1{color:var(--cream);font-size:clamp(1.9rem,4.4vw,3rem);margin:.25em 0 .2em}
.unit-hero .years{font-family:var(--font-display);font-style:italic;color:var(--gold-soft);font-size:1.1rem}
.bigq{
  margin-top:20px;background:rgba(212,164,55,.1);border:1px solid rgba(212,164,55,.45);
  border-radius:12px;padding:16px 22px;max-width:760px;
}
.bigq b{color:var(--gold-bright);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;display:block;margin-bottom:4px}
.bigq span{font-family:var(--font-display);font-size:1.18rem;font-style:italic}
.skill-chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}
.skill-chips .sk{font-size:.74rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;padding:5px 13px;border-radius:99px;border:1px solid rgba(247,241,225,.4)}
.skill-chips .sk.on{background:var(--gold);color:var(--navy-deep);border-color:var(--gold)}
.skill-chips .sk.off{opacity:.45;text-decoration:line-through}

.journey{display:flex;gap:6px;flex-wrap:wrap;margin-top:26px}
.journey a{
  font-size:.78rem;font-weight:700;color:var(--cream);text-decoration:none;
  background:rgba(247,241,225,.1);padding:7px 14px;border-radius:99px;border:1px solid rgba(247,241,225,.25);
}
.journey a:hover{border-color:var(--gold);color:var(--gold-bright)}

.footer-nav{display:flex;justify-content:space-between;gap:14px;padding:40px 0 70px;flex-wrap:wrap}
footer.site{background:var(--navy-deep);color:#9aa3bf;font-size:.82rem;padding:26px 0;text-align:center;border-top:3px solid var(--gold)}
footer.site a{color:var(--gold-soft)}

/* word bank */
.wordbank{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.wordbank span{background:#fff;border:1px solid var(--line);border-radius:99px;padding:5px 13px;font-size:.82rem}

/* ---------- Course-complete celebration ---------- */
.complete-banner{
  margin:0 0 34px;text-align:center;color:var(--cream);
  background:linear-gradient(150deg,var(--navy-deep),var(--navy-soft));
  border:3px solid var(--gold);border-radius:var(--radius);
  padding:38px 30px;box-shadow:var(--shadow);
}
.complete-banner .medal-row{font-size:1.7rem;letter-spacing:.35em;margin-bottom:10px}
.complete-banner h2{color:var(--gold-bright);font-size:clamp(1.5rem,3vw,2.1rem);margin-bottom:10px}
.complete-banner p{max-width:64ch;margin:0 auto;color:#e8e2cf}
.complete-banner b{color:var(--gold-bright)}

/* ---------- Accessibility ---------- */
button:focus-visible,a:focus-visible,.chip:focus-visible,.opt:focus-visible,.cell:focus-visible{
  outline:3px solid var(--accent);outline-offset:2px;
}
.hotspot:focus-visible{outline:none}
.hotspot:focus-visible circle.core{stroke:#fff;stroke-width:3.5}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .hotspot circle.ring{animation:none}
  .confetti{display:none}
  .toast{animation:none}
  .btn,.ucard,.dcard{transition:none}
}

@media(max-width:860px){
  .hero .wrap{grid-template-columns:1fr;padding-top:44px}
  .navunits a{width:26px;height:26px;line-height:26px;font-size:.74rem}
  .brand small{display:none}
  .modal-card{padding:24px 20px}
}