:root{
  --bg:#FFFAFA;
  --ink:#111111;
  --muted:#777777;
  --red:#FF3B30;
  --green:#34C759;
  --green-d:#1E8E45;
  --yellow:#FFD60A;
  --orange:#FF9500;
  --purple:#AF52DE;
  --blue:#007AFF;
  --card:#FFFFFF;
  --soft:#F5F5F5;
  --line:#ECECEC;
  --shadow-lg:0 18px 60px rgba(17,17,17,0.10);
  --shadow-sm:0 2px 8px rgba(0,0,0,0.06);
  --shadow-red:0 4px 20px rgba(255,59,48,0.30);
}

*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:'DM Sans',system-ui,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  padding:0 18px 64px;
}
.wrap{max-width:980px;margin:0 auto;}

h1,h2,h3,.brand-font{font-family:'Unbounded',sans-serif;}

/* ── Header ── */
header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,250,250,0.85);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  margin:0 -18px;padding:10px 18px;
  border-bottom:1px solid var(--line);
}
.header-row{
  max-width:980px;margin:0 auto;
  display:flex;align-items:center;gap:12px;
  justify-content:space-between;
}
.logo-cluster{display:flex;align-items:center;gap:10px;min-width:0;text-decoration:none;}
.logo-cluster img.logo{height:34px;width:auto;flex-shrink:0;}
.logo-mini-kitten{height:34px;width:auto;flex-shrink:0;}

/* ── Main nav ── */
.main-nav{display:flex;align-items:center;gap:2px;margin-left:auto;}
.main-nav a{
  font-family:'DM Sans',sans-serif;font-weight:600;font-size:13.5px;
  color:var(--ink);text-decoration:none;padding:7px 10px;border-radius:999px;
  white-space:nowrap;transition:background .15s ease,color .15s ease;
}
.main-nav a:hover{background:var(--soft);}
.header-actions{display:flex;align-items:center;gap:10px;flex-shrink:0;}

.burger{
  display:none;border:1.5px solid var(--line);background:var(--card);
  width:40px;height:40px;border-radius:12px;cursor:pointer;padding:0;
  flex-direction:column;align-items:center;justify-content:center;gap:4px;
  flex-shrink:0;transition:border-color .15s ease;
}
.burger:hover{border-color:#d8d8d8;}
.burger span{
  display:block;width:18px;height:2px;border-radius:2px;background:var(--ink);
  transition:transform .2s ease,opacity .2s ease;
}
.burger.open span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.burger.open span:nth-child(2){opacity:0;}
.burger.open span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

.nav-cta{
  flex-shrink:0;
  font-family:'Unbounded',sans-serif;font-weight:700;font-size:12px;
  background:var(--red);color:#fff;text-decoration:none;
  padding:9px 16px;border-radius:999px;white-space:nowrap;
  box-shadow:var(--shadow-red);transition:transform .15s ease;
}
.nav-cta:active{transform:scale(.95);}
.cta-short{display:none;}

/* ── Hero ── */
.hero{
  text-align:center;
  padding:36px 16px 8px;
}
.hero .kitten-zone{
  width:130px;height:130px;margin:0 auto 8px;position:relative;
  display:flex;align-items:flex-end;justify-content:center;
}
.hero .kitten-img{width:118px;height:auto;animation:bob 4s ease-in-out infinite;}
.hero .kitten-shadow{
  position:absolute;bottom:2px;left:50%;transform:translateX(-50%);
  width:70px;height:13px;background:rgba(17,17,17,0.12);
  border-radius:50%;filter:blur(1px);z-index:-1;
  animation:shadowPulse 4s ease-in-out infinite;
}
@keyframes bob{0%,100%{transform:translateY(0);}50%{transform:translateY(-8px);}}
@keyframes shadowPulse{0%,100%{transform:translateX(-50%) scale(1);opacity:.6;}50%{transform:translateX(-50%) scale(.82);opacity:.4;}}
.hero h1{
  font-weight:900;font-size:clamp(28px,6vw,46px);line-height:1.04;
  margin:6px 0 0;letter-spacing:-0.02em;
}
.hero h1 .accent{color:var(--red);}
.hero p.sub{
  color:var(--muted);font-size:clamp(15px,2.4vw,18px);
  max-width:540px;margin:14px auto 0;font-weight:400;
}
.stats{
  display:flex;gap:10px;justify-content:center;flex-wrap:wrap;
  margin:22px 0 4px;
}
.stat-pill{
  background:var(--card);border:1px solid var(--line);
  border-radius:999px;padding:8px 16px;font-size:14px;font-weight:500;
  box-shadow:var(--shadow-sm);display:flex;align-items:center;gap:7px;
}
.stat-pill b{font-family:'Unbounded',sans-serif;font-weight:700;}

/* ── Search ── */
.toolbar{
  position:sticky;top:55px;z-index:40;
  background:var(--bg);
  margin:0 -18px;padding:14px 18px 12px;
}
.toolbar-inner{max-width:980px;margin:0 auto;}
.search-box{position:relative;}
.search-box .ico{
  position:absolute;left:18px;top:50%;transform:translateY(-50%);
  font-size:18px;pointer-events:none;opacity:.5;
}
#search{
  width:100%;border:1.5px solid var(--line);background:var(--card);
  border-radius:999px;padding:15px 18px 15px 48px;
  font-family:'DM Sans',sans-serif;font-size:16px;color:var(--ink);
  box-shadow:var(--shadow-sm);outline:none;transition:border-color .15s,box-shadow .15s;
}
#search::placeholder{color:#9a9a9a;}
#search:focus{border-color:var(--red);box-shadow:0 0 0 4px rgba(255,59,48,0.10);}

.chips{display:flex;gap:9px;flex-wrap:wrap;margin-top:12px;}
.chip{
  border:1.5px solid var(--line);background:var(--card);
  border-radius:999px;padding:8px 15px;font-size:13.5px;font-weight:600;
  font-family:'DM Sans',sans-serif;color:var(--ink);cursor:pointer;
  transition:all .15s ease;display:flex;align-items:center;gap:6px;
  user-select:none;
}
.chip:hover{border-color:#d8d8d8;}
.chip.active{background:var(--ink);color:#fff;border-color:var(--ink);}
.chip .dot{width:9px;height:9px;border-radius:50%;flex-shrink:0;}

/* ── Sections / cards ── */
.section-head{
  display:flex;align-items:center;gap:11px;
  margin:34px 0 14px;
}
.section-head .badge{
  width:40px;height:40px;border-radius:13px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;font-size:21px;
}
.section-head h2{font-size:22px;font-weight:700;margin:0;letter-spacing:-0.01em;}
.section-head .count{
  margin-left:auto;font-size:13px;color:var(--muted);font-weight:500;
  background:var(--soft);padding:4px 11px;border-radius:999px;
}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;}

.card{
  background:var(--card);border:1px solid var(--line);
  border-radius:24px;padding:22px 22px 20px;
  box-shadow:var(--shadow-sm);
  position:relative;overflow:hidden;
  transition:transform .18s ease,box-shadow .18s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);}
.card::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:5px;
  background:var(--accent,var(--red));
}
.card .topic{
  display:inline-flex;align-items:center;gap:6px;
  font-size:11.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  color:var(--accent,var(--red));margin-bottom:9px;
}
.card h3{font-size:18px;font-weight:700;margin:0 0 8px;line-height:1.25;letter-spacing:-0.01em;}
.card h3 .ru{font-family:'DM Sans',sans-serif;font-weight:600;}
.card .rule{font-size:15px;color:#2a2a2a;margin:0 0 14px;}
.card .rule b{font-weight:600;color:var(--ink);}
.card .rule .ru{font-weight:600;}

.examples{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:4px;}
.ex{
  font-size:14px;font-weight:500;padding:6px 12px;border-radius:999px;
  display:inline-flex;align-items:center;gap:6px;white-space:nowrap;
}
.ex.ok{background:rgba(52,199,89,0.12);color:var(--green-d);}
.ex.bad{background:rgba(255,59,48,0.10);color:var(--red);}
.ex.bad .word{text-decoration:line-through;text-decoration-color:rgba(255,59,48,.45);}
.ex .mark{font-weight:700;display:inline-block;}
.ex .stress{color:var(--red);font-weight:700;}
.ex .t{color:var(--muted);font-weight:400;font-size:12.5px;}

.tip{
  margin-top:14px;background:#FFFBEC;border:1px solid #F6E7A8;
  border-radius:14px;padding:11px 14px;font-size:13.5px;color:#7a5d00;
  display:flex;gap:8px;align-items:flex-start;
}
.tip b{color:#5c4500;}
.tip .ru{font-weight:600;}

.no-results{
  text-align:center;padding:60px 20px;color:var(--muted);
  font-size:16px;display:none;
}
.no-results .big{font-size:42px;margin-bottom:8px;}

/* ── Footer CTA ── */
.footer-cta{
  margin:56px 0 0;background:var(--ink);border-radius:32px;
  padding:40px 28px;text-align:center;color:#fff;position:relative;overflow:hidden;
}
.footer-cta::after{
  content:"";position:absolute;right:-60px;top:-60px;width:200px;height:200px;
  background:radial-gradient(circle,rgba(255,59,48,.4),transparent 70%);
}
.footer-cta h2{font-size:clamp(22px,4vw,30px);font-weight:900;margin:0 0 10px;position:relative;}
.footer-cta p{color:rgba(255,255,255,0.7);margin:0 auto 22px;max-width:440px;position:relative;}
.footer-cta .btn{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--red);color:#fff;text-decoration:none;
  font-family:'Unbounded',sans-serif;font-weight:700;font-size:15px;
  padding:15px 28px;border-radius:999px;box-shadow:var(--shadow-red);
  position:relative;transition:transform .15s ease;
}
.footer-cta .btn:active{transform:scale(.96);}

footer.legal{
  text-align:center;color:var(--muted);font-size:13px;
  padding:30px 0 10px;
}
footer.legal a{color:var(--ink);text-decoration:none;font-weight:600;}

/* ── Free Materials banner (homepage) ── */
.materials-banner{
  display:flex;align-items:center;gap:18px;text-decoration:none;color:#fff;
  margin:22px 0 4px;padding:20px 24px;border-radius:24px;
  background:linear-gradient(120deg,#7B2FF7 0%,#AF52DE 45%,#007AFF 100%);
  position:relative;overflow:hidden;
  transition:transform .18s ease;
}
.materials-banner::after{
  content:"";position:absolute;right:-40px;top:-50px;width:180px;height:180px;
  background:radial-gradient(circle,rgba(255,255,255,.25),transparent 70%);
}
.materials-banner:hover{transform:translateY(-3px);}
.materials-banner .mb-icon{font-size:38px;line-height:1;flex-shrink:0;position:relative;}
.materials-banner .mb-text{flex:1;min-width:0;position:relative;}
.materials-banner .mb-title{font-family:'Unbounded',sans-serif;font-weight:900;font-size:20px;letter-spacing:-0.01em;}
.materials-banner .mb-sub{font-size:14px;color:rgba(255,255,255,0.85);margin-top:3px;}
.materials-banner .mb-go{
  flex-shrink:0;position:relative;white-space:nowrap;
  font-family:'Unbounded',sans-serif;font-weight:700;font-size:14px;
  background:rgba(255,255,255,0.18);border:1px solid rgba(255,255,255,0.35);
  padding:10px 18px;border-radius:999px;
}
.nav-link-materials{color:var(--purple) !important;font-weight:700 !important;}

/* ── Booking form (book.html) ── */
.book-form{max-width:620px;margin:6px auto 0;}
.field{margin-top:18px;}
.field > label,.field-label{
  display:block;font-weight:600;font-size:14px;margin-bottom:7px;color:var(--ink);
}
.field-hint{display:block;font-size:12.5px;color:var(--muted);margin-top:6px;}
.book-form input[type=text],
.book-form input[type=email],
.book-form input[type=tel]{
  width:100%;border:1.5px solid var(--line);background:var(--card);
  border-radius:14px;padding:14px 16px;
  font-family:'DM Sans',sans-serif;font-size:16px;color:var(--ink);
  outline:none;transition:border-color .15s ease,box-shadow .15s ease;
}
.book-form input::placeholder{color:#9a9a9a;}
.book-form input:focus{border-color:var(--red);box-shadow:0 0 0 4px rgba(255,59,48,0.10);}

.level-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;}
.level-card{
  position:relative;display:flex;flex-direction:column;gap:2px;cursor:pointer;
  border:1.5px solid var(--line);background:var(--card);border-radius:16px;
  padding:14px 16px;transition:border-color .15s ease,box-shadow .15s ease,background .15s ease;
}
.level-card input{position:absolute;opacity:0;width:0;height:0;pointer-events:none;}
.level-card .lvl-title{font-weight:700;font-size:15px;letter-spacing:-0.01em;}
.level-card .lvl-desc{font-size:13px;color:var(--muted);line-height:1.35;}
.level-card:hover{border-color:#d8d8d8;}
.level-card.is-checked,.level-card:has(input:checked){
  border-color:var(--red);box-shadow:0 0 0 3px rgba(255,59,48,0.12);
}
.level-card.is-checked .lvl-title,.level-card:has(input:checked) .lvl-title{color:var(--red);}

.hp{position:absolute !important;left:-9999px;top:-9999px;width:1px;height:1px;opacity:0;}

.submit-btn{
  display:block;width:100%;margin-top:24px;border:none;cursor:pointer;
  font-family:'Unbounded',sans-serif;font-weight:700;font-size:16px;color:#fff;
  background:var(--red);padding:16px 24px;border-radius:999px;box-shadow:var(--shadow-red);
  transition:transform .15s ease,background .15s ease,opacity .15s ease;
}
.submit-btn:hover{background:#e6342a;}
.submit-btn:active{transform:scale(.98);}
.submit-btn:disabled{opacity:.65;cursor:default;}
.form-note{text-align:center;color:var(--muted);font-size:12.5px;margin-top:12px;}
.form-error{
  text-align:center;color:var(--red);font-weight:600;font-size:14px;margin-top:14px;
  background:rgba(255,59,48,0.08);border:1px solid rgba(255,59,48,0.25);
  border-radius:12px;padding:10px 14px;
}

.book-success{
  max-width:620px;margin:18px auto 0;text-align:center;
  background:var(--card);border:1px solid var(--line);border-radius:24px;
  padding:42px 28px;box-shadow:var(--shadow-sm);
}
.book-success .bs-emoji{font-size:48px;line-height:1;}
.book-success h2{font-size:26px;font-weight:900;margin:8px 0 8px;}
.book-success p{color:#555;max-width:420px;margin:0 auto 20px;}
.btn-ghost{
  display:inline-block;text-decoration:none;
  font-family:'Unbounded',sans-serif;font-weight:700;font-size:14px;color:var(--ink);
  border:1.5px solid var(--line);padding:12px 22px;border-radius:999px;transition:border-color .15s ease;
}
.btn-ghost:hover{border-color:#d8d8d8;}

/* ── "Book a free lesson" CTA (lesson pages) ── */
.lesson-cta{
  display:flex;align-items:center;gap:20px;flex-wrap:wrap;
  text-decoration:none;color:#fff;
  margin:26px 0 0;padding:26px 28px;border-radius:26px;
  background:linear-gradient(120deg,#FF6B5A 0%,#FF3B30 48%,#FF9F0A 100%);
  box-shadow:0 16px 40px rgba(255,59,48,0.30);
  position:relative;overflow:hidden;
  transition:transform .18s ease,box-shadow .18s ease;
}
.lesson-cta::after{
  content:"";position:absolute;right:-50px;top:-60px;width:220px;height:220px;
  background:radial-gradient(circle,rgba(255,255,255,.28),transparent 70%);
}
.lesson-cta:hover{transform:translateY(-3px);box-shadow:0 22px 52px rgba(255,59,48,0.40);}
.lcta-emoji{
  font-size:44px;line-height:1;flex-shrink:0;position:relative;
  filter:drop-shadow(0 4px 8px rgba(0,0,0,0.18));
}
.lcta-text{flex:1;min-width:180px;position:relative;}
.lcta-title{font-family:'Unbounded',sans-serif;font-weight:900;font-size:23px;letter-spacing:-0.01em;line-height:1.1;}
.lcta-sub{font-size:14.5px;color:rgba(255,255,255,0.92);margin-top:6px;max-width:440px;}
.lcta-sub b{font-weight:700;color:#fff;}
.lcta-btn{
  flex-shrink:0;position:relative;white-space:nowrap;
  font-family:'Unbounded',sans-serif;font-weight:700;font-size:15px;color:var(--red);
  background:#fff;padding:14px 24px;border-radius:999px;
  box-shadow:0 6px 18px rgba(0,0,0,0.20);
  animation:ctaPulse 2.4s ease-in-out infinite;
}
@keyframes ctaPulse{0%,100%{transform:scale(1);}50%{transform:scale(1.06);}}
@media (prefers-reduced-motion:reduce){.lcta-btn{animation:none;}}

/* ── Material (PDF) cards ── */
.material-card{
  display:flex;flex-direction:column;
  background:var(--card);border:1px solid var(--line);
  border-radius:20px;padding:18px 18px 16px;box-shadow:var(--shadow-sm);
  position:relative;overflow:hidden;
  transition:transform .18s ease,box-shadow .18s ease;
}
.material-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);}
.material-card::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:5px;
  background:var(--accent,var(--red));
}
.material-card .mc-top{display:flex;align-items:flex-start;gap:10px;margin-bottom:14px;}
.material-card .mc-badge{
  flex-shrink:0;font-family:'Unbounded',sans-serif;font-weight:700;font-size:10.5px;
  letter-spacing:.04em;color:#fff;background:var(--accent,var(--red));
  padding:4px 8px;border-radius:7px;margin-top:2px;
}
.material-card h3{font-size:16px;font-weight:700;margin:0;line-height:1.25;letter-spacing:-0.01em;}
.material-card .mc-actions{display:flex;gap:8px;margin-top:auto;}
.mc-btn{
  flex:1;text-align:center;text-decoration:none;
  font-family:'DM Sans',sans-serif;font-weight:600;font-size:13.5px;
  padding:10px 12px;border-radius:12px;transition:background .15s ease,border-color .15s ease,transform .1s ease;
}
.mc-btn:active{transform:scale(.97);}
.mc-btn.view{background:var(--soft);color:var(--ink);border:1px solid var(--line);}
.mc-btn.view:hover{background:#ececec;}
.mc-btn.dl{background:var(--ink);color:#fff;border:1px solid var(--ink);}
.mc-btn.dl:hover{background:#000;}

/* ── Hub topic cards ── */
.hub-card{
  display:flex;flex-direction:column;text-decoration:none;color:inherit;
  background:var(--card);border:1px solid var(--line);
  border-radius:22px;padding:20px 20px 18px;
  box-shadow:var(--shadow-sm);position:relative;overflow:hidden;
  transition:transform .18s ease,box-shadow .18s ease;
}
.hub-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);}
.hub-card::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:5px;
  background:var(--accent,var(--red));
}
.hub-card .hc-icon{font-size:26px;line-height:1;margin-bottom:12px;}
.hub-card h3{font-size:17px;font-weight:700;margin:0 0 3px;line-height:1.2;letter-spacing:-0.01em;}
.hub-card .hc-ru{font-family:'DM Sans',sans-serif;font-weight:600;font-size:13.5px;color:var(--accent,var(--red));margin-bottom:9px;}
.hub-card .hc-blurb{font-size:14px;color:#555;margin:0;flex:1;}
.hub-card .hc-go{
  margin-top:14px;font-size:13px;font-weight:700;color:var(--ink);
  display:inline-flex;align-items:center;gap:5px;
}

.group-head{
  display:flex;align-items:baseline;gap:11px;margin:36px 0 14px;
  scroll-margin-top:150px;
}
.group-head h2{font-size:21px;font-weight:700;margin:0;letter-spacing:-0.01em;}
.group-head .count{
  font-size:13px;color:var(--muted);font-weight:500;
  background:var(--soft);padding:3px 11px;border-radius:999px;
}

/* ── Lesson pages ── */
.lesson{max-width:820px;margin:0 auto;}
.crumbs{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  font-size:13px;color:var(--muted);margin:26px 0 14px;
}
.crumbs a{color:var(--muted);text-decoration:none;font-weight:600;}
.crumbs a:hover{color:var(--ink);}
.lesson-head{margin:0 0 8px;}
.lesson-head .l-kicker{
  display:inline-flex;align-items:center;gap:7px;
  font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;
  color:var(--accent,var(--red));margin-bottom:8px;
}
.lesson-head h1{font-size:clamp(26px,5vw,38px);font-weight:900;margin:0;letter-spacing:-0.02em;line-height:1.08;}
.lesson-head .l-ru{font-family:'DM Sans',sans-serif;font-weight:600;font-size:16px;color:var(--muted);margin:6px 0 0;}
.lesson .intro{font-size:17px;color:#2a2a2a;margin:18px 0 8px;}
.lesson .intro b{font-weight:600;color:var(--ink);}
.lesson .intro .ru{font-weight:600;}

.lesson section{
  background:var(--card);border:1px solid var(--line);border-radius:22px;
  padding:22px 22px 20px;margin-top:18px;box-shadow:var(--shadow-sm);
  position:relative;overflow:hidden;
}
.lesson section::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:5px;
  background:var(--accent,var(--red));
}
.lesson section h2{font-size:19px;font-weight:700;margin:0 0 12px;letter-spacing:-0.01em;}
.lesson section p{font-size:15.5px;color:#2a2a2a;margin:0 0 10px;}
.lesson section p:last-child{margin-bottom:0;}
.lesson section b{font-weight:600;color:var(--ink);}
.lesson section .ru{font-weight:600;}
.lesson section ul{margin:0 0 10px;padding-left:20px;}
.lesson section li{font-size:15.5px;color:#2a2a2a;margin-bottom:6px;}

.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:4px 0 6px;border-radius:14px;border:1px solid var(--line);}
table.lesson-table{
  border-collapse:collapse;width:100%;min-width:380px;font-size:14.5px;background:var(--card);
}
table.lesson-table caption{
  caption-side:top;text-align:left;font-size:13px;color:var(--muted);
  font-weight:600;padding:10px 14px 8px;
}
table.lesson-table th,table.lesson-table td{
  text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);
  white-space:nowrap;
}
table.lesson-table thead th{
  background:var(--soft);font-weight:700;font-size:12.5px;
  text-transform:uppercase;letter-spacing:.03em;color:#444;
}
table.lesson-table tbody th{font-weight:700;color:var(--ink);background:rgba(0,0,0,0.015);}
table.lesson-table tbody tr:last-child td,
table.lesson-table tbody tr:last-child th{border-bottom:none;}
table.lesson-table .stress{color:var(--red);font-weight:700;}
table.lesson-table .end{color:var(--accent,var(--red));font-weight:700;}
table.lesson-table .muted{color:var(--muted);font-weight:400;}

.lesson-nav{
  display:flex;gap:12px;margin:28px 0 0;flex-wrap:wrap;
}
.lesson-nav a{
  flex:1;min-width:160px;text-decoration:none;color:inherit;
  background:var(--card);border:1px solid var(--line);border-radius:18px;
  padding:14px 18px;box-shadow:var(--shadow-sm);
  transition:transform .15s ease,box-shadow .15s ease;
}
.lesson-nav a:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}
.lesson-nav .ln-dir{font-size:12px;color:var(--muted);font-weight:600;margin-bottom:3px;}
.lesson-nav .ln-title{font-weight:700;font-size:15px;letter-spacing:-0.01em;}
.lesson-nav a.next{text-align:right;}

/* ── Mobile nav: collapse into burger dropdown ── */
@media (max-width:1024px){
  .burger{display:flex;}
  .main-nav{
    position:absolute;top:calc(100% + 8px);right:0;left:0;
    flex-direction:column;align-items:stretch;gap:2px;
    background:var(--card);border:1px solid var(--line);
    border-radius:18px;padding:8px;margin:0;
    box-shadow:var(--shadow-lg);
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .18s ease,transform .18s ease,visibility .18s ease;
  }
  .main-nav.open{opacity:1;visibility:visible;transform:translateY(0);}
  .main-nav a{padding:11px 14px;border-radius:12px;font-size:15px;}
  .header-row{position:relative;}
}

@media (max-width:560px){
  .grid{grid-template-columns:1fr;}
  .toolbar{top:54px;}
  .header-row{gap:8px;}
  .nav-cta{padding:8px 13px;font-size:11px;}
  .cta-full{display:none;}
  .cta-short{display:inline;}
  .logo-cluster img.logo{height:30px;}
  .card{border-radius:22px;padding:20px 18px 18px;}
  .lesson section{padding:20px 18px 18px;}
  .materials-banner{gap:14px;padding:18px 18px;}
  .materials-banner .mb-icon{font-size:30px;}
  .materials-banner .mb-title{font-size:18px;}
  .materials-banner .mb-go{display:none;}
  .lesson-cta{gap:14px;padding:22px 20px;}
  .lcta-emoji{font-size:36px;}
  .lcta-title{font-size:20px;}
  .lcta-btn{flex-basis:100%;text-align:center;animation:none;}
}

/* Tiny screens: drop the wordmark, keep the kitten as the logo */
@media (max-width:420px){
  .logo-cluster img.logo{display:none;}
}