/* ========== LearnQuest Academy — themeable ========== */
:root{
  --bg:#f3f0ff;
  --card:#ffffff;
  --soft:#f3f0ff;
  --ink:#2d2a4a;
  --ink-soft:#5b5680;
  --line:#e6e1ff;
  --accent:#7c5cff;
  --accent-dark:#5a3de0;
  --topbar:rgba(255,255,255,.93);
  --hero-a:#7c5cff; --hero-b:#9b6bff; --hero-c:#ff5c8a;
  --blob1:rgba(255,212,59,.16); --blob2:rgba(255,92,138,.12);
  --blob3:rgba(77,150,255,.12); --blob4:rgba(0,201,167,.12);
  --good-bg:#e7fbee; --good-bd:#2ecc71;
  --bad-bg:#ffecec;  --bad-bd:#ff6b6b;
  --fact-bg:#fff8e1; --fact-bd:#ffd43b; --fact-ink:#b8860b;
  --starpill-bg:#fff8e1; --starpill-bd:#ffe08a;
  --green:#2ecc71; --green-dark:#1f9e54;
  --radius:22px;
  --shadow:0 6px 0 rgba(45,42,74,.08), 0 12px 30px rgba(124,92,255,.12);
  --shadow-lift:0 10px 0 rgba(45,42,74,.06), 0 20px 40px rgba(124,92,255,.20);
}
body[data-theme="midnight"]{
  --bg:#12122b; --card:#1d1d3f; --soft:#26264f;
  --ink:#eceaff; --ink-soft:#a7a2d6; --line:#34316a;
  --accent:#9d7bff; --accent-dark:#6f4fe0;
  --topbar:rgba(18,18,43,.93);
  --hero-a:#3b2d8f; --hero-b:#6f4fe0; --hero-c:#c73e77;
  --blob1:rgba(157,123,255,.10); --blob2:rgba(255,92,138,.08);
  --blob3:rgba(77,150,255,.08); --blob4:rgba(0,201,167,.08);
  --good-bg:#143622; --good-bd:#2ecc71;
  --bad-bg:#3a1a20;  --bad-bd:#ff6b6b;
  --fact-bg:#332d10; --fact-bd:#c9a227; --fact-ink:#ffd43b;
  --starpill-bg:#332d10; --starpill-bd:#6b5e1a;
  --shadow:0 6px 0 rgba(0,0,0,.25), 0 12px 30px rgba(0,0,0,.35);
  --shadow-lift:0 10px 0 rgba(0,0,0,.2), 0 20px 40px rgba(0,0,0,.45);
}
body[data-theme="ocean"]{
  --bg:#e8f6ff; --card:#ffffff; --soft:#e8f6ff;
  --ink:#123a5c; --ink-soft:#4a6b8a; --line:#cfe8f7;
  --accent:#0e9be0; --accent-dark:#0b7ab8;
  --topbar:rgba(255,255,255,.93);
  --hero-a:#0e9be0; --hero-b:#2fb4e8; --hero-c:#00c9a7;
  --blob1:rgba(0,201,167,.16); --blob2:rgba(14,155,224,.14);
  --blob3:rgba(77,150,255,.12); --blob4:rgba(255,212,59,.14);
  --good-bg:#e2f9ec; --good-bd:#18b46b;
  --bad-bg:#ffeceb;  --bad-bd:#ff6b6b;
  --fact-bg:#e5fbf7; --fact-bd:#00c9a7; --fact-ink:#00775f;
  --starpill-bg:#fff8e1; --starpill-bd:#ffe08a;
  --shadow:0 6px 0 rgba(18,58,92,.07), 0 12px 30px rgba(14,155,224,.14);
  --shadow-lift:0 10px 0 rgba(18,58,92,.05), 0 20px 40px rgba(14,155,224,.22);
}
body[data-theme="candy"]{
  --bg:#fff0f5; --card:#ffffff; --soft:#fff0f5;
  --ink:#4a2440; --ink-soft:#8a5a78; --line:#ffd9e8;
  --accent:#ff5c8a; --accent-dark:#e0356b;
  --topbar:rgba(255,255,255,.93);
  --hero-a:#ff5c8a; --hero-b:#ff7eb0; --hero-c:#ff9f43;
  --blob1:rgba(255,159,67,.16); --blob2:rgba(255,92,138,.14);
  --blob3:rgba(165,94,234,.12); --blob4:rgba(255,212,59,.16);
  --good-bg:#e7fbee; --good-bd:#2ecc71;
  --bad-bg:#ffecec;  --bad-bd:#ff6b6b;
  --fact-bg:#fff3e5; --fact-bd:#ff9f43; --fact-ink:#c96a10;
  --starpill-bg:#fff8e1; --starpill-bd:#ffe08a;
  --shadow:0 6px 0 rgba(74,36,64,.07), 0 12px 30px rgba(255,92,138,.14);
  --shadow-lift:0 10px 0 rgba(74,36,64,.05), 0 20px 40px rgba(255,92,138,.22);
}
body[data-theme="jungle"]{
  --bg:#eef8ee; --card:#ffffff; --soft:#eef8ee;
  --ink:#1e3a24; --ink-soft:#4f7358; --line:#d4ecd4;
  --accent:#2fa860; --accent-dark:#1f8a4c;
  --topbar:rgba(255,255,255,.93);
  --hero-a:#1f8a4c; --hero-b:#2fa860; --hero-c:#00c9a7;
  --blob1:rgba(47,168,96,.14); --blob2:rgba(255,212,59,.16);
  --blob3:rgba(0,201,167,.12); --blob4:rgba(255,159,67,.12);
  --good-bg:#e7fbee; --good-bd:#2ecc71;
  --bad-bg:#ffecec;  --bad-bd:#ff6b6b;
  --fact-bg:#f4fbe5; --fact-bd:#9ac72a; --fact-ink:#5e7d10;
  --starpill-bg:#fff8e1; --starpill-bd:#ffe08a;
  --shadow:0 6px 0 rgba(30,58,36,.07), 0 12px 30px rgba(47,168,96,.14);
  --shadow-lift:0 10px 0 rgba(30,58,36,.05), 0 20px 40px rgba(47,168,96,.22);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Nunito',sans-serif;
  background:var(--bg);
  background-image:
    radial-gradient(circle at 12% 18%, var(--blob1) 0 140px, transparent 140px),
    radial-gradient(circle at 88% 12%, var(--blob2) 0 160px, transparent 160px),
    radial-gradient(circle at 80% 85%, var(--blob3) 0 180px, transparent 180px),
    radial-gradient(circle at 8% 80%, var(--blob4) 0 150px, transparent 150px);
  background-attachment:fixed;
  color:var(--ink);
  min-height:100vh;
  line-height:1.6;
  transition:background-color .35s, color .35s;
}
h1,h2,h3,h4,.brand,.btn{font-family:'Baloo 2',cursive}
button{font-family:inherit}
.btn:focus-visible,.opt:focus-visible,.chip:focus-visible,.icon-btn:focus-visible,.theme-opt:focus-visible,.search-box:focus-visible{
  outline:3px solid var(--accent);outline-offset:2px;
}
@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important}
}

/* ---------- entrance animation ---------- */
@keyframes riseIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}
.pop-in{animation:riseIn .45s ease both;animation-delay:var(--d,0ms)}

/* ---------- top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:10px 22px;
  background:var(--topbar);
  border-bottom:3px solid var(--line);
  transition:background-color .35s;
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;font-size:1.35rem}
.brand-rocket{font-size:1.7rem;display:inline-block;animation:bob 2.6s ease-in-out infinite}
.brand-text em{font-style:normal;color:var(--accent)}
.brand-sub{
  font-family:'Nunito',sans-serif;font-weight:800;font-size:.72rem;letter-spacing:.5px;
  background:var(--accent);color:#fff;border-radius:999px;padding:3px 10px;align-self:center;
}
.hub-link{text-decoration:none;transition:transform .12s;display:inline-block}
.hub-link:hover{transform:translateY(-2px)}
@media(max-width:760px){.hub-link{display:none}}
@keyframes bob{0%,100%{transform:translateY(0) rotate(-6deg)}50%{transform:translateY(-6px) rotate(6deg)}}
.topbar-right{display:flex;gap:8px;align-items:center;position:relative;flex-wrap:wrap;justify-content:flex-end}
.star-pill,.grade-pill{
  background:var(--card);border:2.5px solid var(--line);border-radius:999px;
  padding:6px 14px;font-weight:800;font-size:.95rem;color:var(--ink);
  box-shadow:0 3px 0 rgba(0,0,0,.06);white-space:nowrap;
}
.star-pill{border-color:var(--starpill-bd);background:var(--starpill-bg)}
.icon-btn{
  background:var(--card);border:2.5px solid var(--line);border-radius:999px;
  width:42px;height:42px;font-size:1.25rem;cursor:pointer;line-height:1;
  box-shadow:0 3px 0 rgba(0,0,0,.06);color:var(--ink);
  transition:transform .12s, border-color .12s;
  display:grid;place-items:center;
}
.icon-btn:hover{transform:translateY(-2px);border-color:var(--accent)}

/* ---------- theme menu ---------- */
.theme-menu{
  position:absolute;top:52px;right:0;z-index:60;
  background:var(--card);border:3px solid var(--line);border-radius:18px;
  padding:10px;min-width:210px;box-shadow:var(--shadow-lift);
  display:grid;gap:6px;
}
.theme-menu.hidden{display:none}
.theme-menu h5{font-family:'Baloo 2',cursive;font-size:.95rem;color:var(--ink-soft);padding:2px 8px}
.theme-opt{
  display:flex;align-items:center;gap:10px;
  background:transparent;border:2.5px solid transparent;border-radius:12px;
  padding:8px 10px;cursor:pointer;font-weight:800;font-size:1rem;color:var(--ink);
  transition:background .12s, border-color .12s;text-align:left;
}
.theme-opt:hover{background:var(--soft)}
.theme-opt.active{border-color:var(--accent);background:var(--soft)}
.theme-opt .sw{display:flex;gap:3px}
.theme-opt .sw i{width:14px;height:14px;border-radius:50%;display:inline-block;border:2px solid rgba(0,0,0,.12)}
.theme-opt .check{margin-left:auto;color:var(--accent);font-weight:800}

/* ---------- layout ---------- */
main{max-width:1150px;margin:0 auto;padding:28px 22px 80px}
.footer{max-width:1150px;margin:0 auto;padding:26px 22px 40px;color:var(--ink-soft);font-weight:600;text-align:center;font-size:.9rem}

/* ---------- hero ---------- */
.hero{
  position:relative;
  background:linear-gradient(135deg,var(--hero-a) 0%, var(--hero-b) 55%, var(--hero-c) 130%);
  border-radius:32px;
  padding:46px 44px;
  color:#fff;
  overflow:hidden;
  box-shadow:var(--shadow-lift);
  margin-bottom:30px;
}
.hero h1{font-size:clamp(1.9rem,4.5vw,3.1rem);line-height:1.12;margin-bottom:12px}
.hero p{font-size:1.12rem;max-width:620px;font-weight:600;opacity:.95}
.hero .hero-emojis{position:absolute;right:26px;top:50%;transform:translateY(-50%);font-size:4.6rem;display:grid;gap:6px;text-align:center;line-height:1.15;opacity:.95}
.hero .hero-emojis span{display:block;animation:bob 3s ease-in-out infinite}
.hero .hero-emojis span:nth-child(2){animation-delay:.5s}
.hero .hero-emojis span:nth-child(3){animation-delay:1s}
.hero-badges{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.hero-badge{background:rgba(255,255,255,.2);border:2px solid rgba(255,255,255,.45);border-radius:999px;padding:5px 15px;font-weight:800;font-size:.92rem}
@media(max-width:760px){.hero .hero-emojis{display:none}}

/* ---------- continue banner ---------- */
.continue-bar{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  background:var(--card);border:3px solid var(--line);border-radius:18px;
  padding:14px 18px;margin-bottom:26px;box-shadow:var(--shadow);
  text-decoration:none;color:var(--ink);
  transition:transform .13s, border-color .13s;
}
.continue-bar:hover{transform:translateY(-3px);border-color:var(--accent)}
.continue-bar .c-emoji{font-size:1.9rem}
.continue-bar b{font-family:'Baloo 2',cursive}
.continue-bar .go{margin-left:auto;font-weight:800;color:var(--accent);white-space:nowrap}

/* ---------- grade picker & search ---------- */
.grade-picker{margin-bottom:24px}
.grade-picker h2{font-size:1.35rem;margin-bottom:12px}
.grade-chips{display:flex;gap:10px;flex-wrap:wrap}
.chip{
  font-family:'Baloo 2',cursive;font-weight:700;font-size:1rem;
  border:3px solid var(--line);background:var(--card);color:var(--ink);
  border-radius:999px;padding:8px 20px;cursor:pointer;
  box-shadow:0 4px 0 rgba(0,0,0,.06);
  transition:transform .12s, box-shadow .12s, background .12s, border-color .12s;
}
.chip:hover{transform:translateY(-3px);box-shadow:0 7px 0 rgba(0,0,0,.07)}
.chip.active{background:var(--accent);border-color:var(--accent-dark);color:#fff;box-shadow:0 4px 0 var(--accent-dark)}
.search-wrap{position:relative;margin-bottom:26px}
.search-box{
  width:100%;font-family:'Nunito',sans-serif;font-weight:700;font-size:1.05rem;
  background:var(--card);border:3px solid var(--line);border-radius:999px;
  padding:13px 22px 13px 52px;color:var(--ink);
  box-shadow:0 4px 0 rgba(0,0,0,.05);
  transition:border-color .15s;
}
.search-box::placeholder{color:var(--ink-soft);opacity:.7}
.search-box:focus{border-color:var(--accent);outline:none}
.search-wrap .mag{position:absolute;left:20px;top:50%;transform:translateY(-50%);font-size:1.2rem;pointer-events:none}
.search-empty{text-align:center;color:var(--ink-soft);font-weight:700;padding:30px 0;font-size:1.05rem}

/* ---------- subject grid ---------- */
.section-title{font-size:1.6rem;margin:6px 0 16px}
.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:22px}
.subject-card{
  position:relative;display:block;text-decoration:none;color:#fff;
  border-radius:var(--radius);padding:26px 24px 22px;
  box-shadow:var(--shadow);
  transition:transform .15s ease, box-shadow .15s ease;
  overflow:hidden;
}
.subject-card:hover{transform:translateY(-6px) rotate(-.5deg);box-shadow:var(--shadow-lift)}
.subject-card .big-emoji{font-size:3.2rem;line-height:1;margin-bottom:10px;display:inline-block}
.subject-card h3{font-size:1.55rem;margin-bottom:4px}
.subject-card p{font-weight:600;font-size:.95rem;opacity:.94;margin-bottom:14px}
.subject-card .watermark{position:absolute;right:-18px;bottom:-24px;font-size:7.5rem;opacity:.18;transform:rotate(-12deg);pointer-events:none}
.progress-track{background:rgba(255,255,255,.3);border-radius:999px;height:12px;overflow:hidden}
.progress-fill{background:#fff;height:100%;border-radius:999px;transition:width .5s ease}
.progress-label{font-size:.82rem;font-weight:800;margin-top:6px;opacity:.95}

/* subject colors (constant across themes) */
.sc-math{background:linear-gradient(135deg,#4d96ff,#2f6ee0)}
.sc-english{background:linear-gradient(135deg,#ff5c8a,#e0356b)}
.sc-bio{background:linear-gradient(135deg,#2ecc71,#1f9e54)}
.sc-chem{background:linear-gradient(135deg,#a55eea,#7d3fd1)}
.sc-phys{background:linear-gradient(135deg,#ff9f43,#f07f10)}
.sc-hist{background:linear-gradient(135deg,#e05555,#b83232)}

/* ---------- subject page ---------- */
.page-head{display:flex;align-items:center;gap:18px;margin-bottom:8px;flex-wrap:wrap}
.page-head .big-emoji{font-size:3.4rem}
.page-head h1{font-size:2.1rem}
.page-head .subject-stars{
  margin-left:auto;background:var(--starpill-bg);border:2.5px solid var(--starpill-bd);
  border-radius:999px;padding:6px 16px;font-weight:800;color:var(--ink);white-space:nowrap;
}
.page-head p.sub{width:100%;color:var(--ink-soft);font-weight:600;margin-top:-6px}
.back-link{display:inline-block;font-weight:800;color:var(--accent);text-decoration:none;margin-bottom:16px}
.back-link:hover{text-decoration:underline}
.lesson-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:16px;margin-top:18px}
.lesson-card{
  position:relative;background:var(--card);border:3px solid var(--line);
  border-radius:18px;padding:18px 16px 14px;text-decoration:none;color:var(--ink);
  box-shadow:0 4px 0 rgba(0,0,0,.05);
  transition:transform .13s, box-shadow .13s, border-color .13s;
  display:flex;flex-direction:column;gap:6px;
}
.lesson-card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:0 8px 0 rgba(0,0,0,.08)}
.lesson-card .l-emoji{font-size:2rem;line-height:1}
.lesson-card h4{font-size:1.06rem;line-height:1.3}
.lesson-card .l-meta{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:6px;gap:6px}
.tag{font-size:.72rem;font-weight:800;letter-spacing:.4px;background:var(--soft);border:2px solid var(--line);color:var(--ink-soft);padding:2px 10px;border-radius:999px;white-space:nowrap}
.lesson-card .stars{font-size:.85rem;letter-spacing:1px}
.lesson-card.dimmed{opacity:.42}
.lesson-card .l-num{position:absolute;top:10px;right:12px;font-family:'Baloo 2',cursive;font-weight:800;color:var(--line);font-size:1.1rem}
.filter-note{margin-top:14px;color:var(--ink-soft);font-weight:600;font-size:.92rem}

/* ---------- lesson page ---------- */
.lesson-wrap{max-width:860px;margin:0 auto}
.lesson-hero{border-radius:26px;color:#fff;padding:30px 30px 24px;box-shadow:var(--shadow);margin-bottom:22px;position:relative;overflow:hidden}
.lesson-hero .l-emoji{font-size:2.8rem}
.lesson-hero h1{font-size:1.9rem;line-height:1.2;margin:6px 0 4px}
.lesson-hero .tag{background:rgba(255,255,255,.22);border-color:rgba(255,255,255,.5);color:#fff}
.lesson-hero .l-count{position:absolute;top:18px;right:22px;font-family:'Baloo 2',cursive;font-weight:800;background:rgba(255,255,255,.22);border:2px solid rgba(255,255,255,.5);border-radius:999px;padding:3px 14px;font-size:.85rem}
.lesson-body{background:var(--card);border:3px solid var(--line);border-radius:26px;padding:30px 32px;box-shadow:var(--shadow)}
.lesson-body .intro{font-size:1.1rem;font-weight:600;color:var(--ink);margin-bottom:20px}
.lesson-body h3{font-size:1.25rem;margin:22px 0 10px;color:var(--accent)}
.kp-list{list-style:none;display:grid;gap:12px}
.kp-list li{
  background:var(--soft);border:2.5px solid var(--line);border-radius:16px;
  padding:12px 16px 12px 14px;font-weight:600;display:flex;gap:12px;align-items:flex-start;
}
.kp-list li .kp-ico{font-size:1.3rem;line-height:1.4}
.funfact{
  margin-top:22px;background:var(--fact-bg);border:3px dashed var(--fact-bd);border-radius:18px;
  padding:16px 18px;font-weight:700;
}
.funfact b{color:var(--fact-ink)}
.quiz-cta{margin-top:26px;text-align:center}
.lesson-nav{display:flex;gap:12px;justify-content:space-between;margin-top:18px;flex-wrap:wrap}
.lesson-nav .btn{font-size:.95rem;padding:10px 20px}
.lesson-nav .spacer{flex:1}

/* ---------- buttons ---------- */
.btn{
  display:inline-block;border:none;cursor:pointer;text-decoration:none;
  font-size:1.1rem;font-weight:800;color:#fff;
  background:var(--accent);border-radius:999px;padding:13px 34px;
  box-shadow:0 5px 0 var(--accent-dark);
  transition:transform .12s, box-shadow .12s;
}
.btn:hover{transform:translateY(-3px);box-shadow:0 8px 0 var(--accent-dark)}
.btn:active{transform:translateY(2px);box-shadow:0 2px 0 var(--accent-dark)}
.btn.green{background:var(--green);box-shadow:0 5px 0 var(--green-dark)}
.btn.green:hover{box-shadow:0 8px 0 var(--green-dark)}
.btn.ghost{background:var(--card);color:var(--accent);border:3px solid var(--accent);box-shadow:0 5px 0 rgba(0,0,0,.12)}

/* ---------- quiz ---------- */
.quiz-card{background:var(--card);border:3px solid var(--line);border-radius:26px;padding:28px 30px;box-shadow:var(--shadow)}
.quiz-progress{display:flex;gap:8px;margin-bottom:18px}
.qp-dot{flex:1;height:10px;border-radius:999px;background:var(--line);transition:background .3s}
.qp-dot.done{background:var(--green)}
.qp-dot.wrong{background:var(--bad-bd)}
.qp-dot.current{background:var(--accent)}
.quiz-q{font-family:'Baloo 2',cursive;font-size:1.35rem;font-weight:700;margin-bottom:18px}
.quiz-opts{display:grid;gap:12px}
.opt{
  text-align:left;font-family:'Nunito',sans-serif;font-size:1.05rem;font-weight:700;
  background:var(--soft);border:3px solid var(--line);border-radius:16px;
  padding:13px 18px;cursor:pointer;color:var(--ink);
  transition:transform .1s, border-color .1s, background .1s;
  display:flex;gap:12px;align-items:center;
}
.opt .opt-letter{
  font-family:'Baloo 2',cursive;font-weight:800;background:var(--card);border:2.5px solid var(--line);
  border-radius:10px;width:34px;height:34px;display:grid;place-items:center;flex:0 0 34px;
}
.opt:hover:not(:disabled){transform:translateX(4px);border-color:var(--accent)}
.opt.correct{background:var(--good-bg);border-color:var(--good-bd)}
.opt.correct .opt-letter{background:var(--good-bd);border-color:var(--good-bd);color:#fff}
.opt.incorrect{background:var(--bad-bg);border-color:var(--bad-bd)}
.opt.incorrect .opt-letter{background:var(--bad-bd);border-color:var(--bad-bd);color:#fff}
.opt:disabled{cursor:default;opacity:.9}
.opt.faded{opacity:.45}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
.opt.incorrect{animation:shake .3s ease}
.quiz-explain{
  margin-top:16px;border-radius:16px;padding:14px 18px;font-weight:700;
  border:3px solid var(--good-bd);background:var(--good-bg);
  animation:riseIn .3s ease;
}
.quiz-explain.bad{border-color:var(--bad-bd);background:var(--bad-bg)}
.quiz-next{margin-top:18px;text-align:right}
.quiz-tip{margin-top:14px;text-align:center;color:var(--ink-soft);font-weight:700;font-size:.85rem}
@media(hover:none){.quiz-tip{display:none}}

/* ---------- results ---------- */
.result-card{text-align:center;padding:40px 30px}
.result-card .r-emoji{font-size:4.2rem;display:inline-block;animation:pop .5s ease}
@keyframes pop{0%{transform:scale(.2)}70%{transform:scale(1.15)}100%{transform:scale(1)}}
.result-card h2{font-size:2rem;margin:8px 0 4px}
.result-stars{font-size:2.6rem;letter-spacing:6px;margin:10px 0}
.result-card p{font-weight:700;color:var(--ink-soft);margin-bottom:22px}
.result-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ---------- confetti canvas ---------- */
#confetti{position:fixed;inset:0;pointer-events:none;z-index:200}

/* ---------- misc ---------- */
.crumb{font-weight:800;color:var(--ink-soft);font-size:.9rem;margin-bottom:14px}
.crumb a{color:var(--accent);text-decoration:none}
.crumb a:hover{text-decoration:underline}
@media(max-width:640px){
  .hero{padding:32px 24px}
  .lesson-body{padding:22px 20px}
  .topbar{padding:10px 12px}
  .brand-text{font-size:1.05rem}
  .grade-pill{display:none}
  main{padding:20px 14px 60px}
  .continue-bar .go{margin-left:0}
}