/* ============================================================
   Solid State Chemistry — Premium Redesign
   Design language: "Educational App" (indigo + energetic orange)
   Palette: primary #4F46E5 · accent #EA580C · ink #1E1B4B
   Type: Sora (display) + Inter (body) · Mobile-first
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@600;700;800&family=Inter:wght@400;500;600;700&display=swap');

:root{
  --primary:#4F46E5; --primary-deep:#4338CA; --primary-ink:#312E81;
  --accent:#EA580C; --accent-deep:#C2410C; --accent-soft:#FFF4E8;
  --ink:#1E1B4B; --ink-soft:#3B3670; --muted:#565273;
  --bg:#F4F5FE; --card:#FFFFFF; --line:#E3E7F8;
  --gold:#D97706; --green:#059669; --rose:#E11D48;
  --r-lg:22px; --r-md:16px; --r-sm:10px;
  --shadow:0 10px 30px -12px rgba(79,70,229,.25);
  --shadow-lg:0 24px 60px -20px rgba(30,27,75,.35);
  --font-d:'Sora',system-ui,sans-serif;
  --font-b:'Inter',system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-b); font-size:20px; line-height:1.75;
  color:var(--ink); background:var(--bg);
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary-deep)}
::selection{background:#C7D2FE;color:var(--ink)}

/* ---------- Preloader ---------- */
#preloader{position:fixed;inset:0;z-index:2000;background:linear-gradient(135deg,#1E1B4B,#4C1D95 60%,#4F46E5);
  display:flex;flex-direction:column;gap:18px;align-items:center;justify-content:center;
  transition:opacity .5s ease,visibility .5s}
#preloader.done{opacity:0;visibility:hidden}
.pre-cube{width:54px;height:54px;position:relative;transform-style:preserve-3d;animation:spinCube 2.2s linear infinite}
@keyframes spinCube{to{transform:rotateX(360deg) rotateY(360deg)}}
.pre-cube span{position:absolute;inset:0;border:2px solid rgba(255,255,255,.85);border-radius:8px;background:rgba(255,255,255,.08)}
#preloader p{color:#E0E7FF;font-family:var(--font-d);font-size:14px;letter-spacing:2px;text-transform:uppercase}

/* ---------- Scroll progress ---------- */
#scrollbar{position:fixed;top:0;left:0;height:4px;width:0;z-index:1500;
  background:linear-gradient(90deg,var(--accent),#F59E0B,var(--primary));border-radius:0 4px 4px 0}

/* ---------- Topbar ---------- */
.topbar{position:sticky;top:0;z-index:1000;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  background:rgba(255,255,255,.82);border-bottom:1px solid var(--line);transition:box-shadow .3s}
.topbar.scrolled{box-shadow:0 6px 24px -10px rgba(30,27,75,.25)}
.topbar-inner{max-width:1200px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;gap:12px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);margin-right:auto}
.brand .logo{width:40px;height:40px;border-radius:12px;flex:0 0 40px;
  background:linear-gradient(135deg,var(--primary),#7C3AED);display:grid;place-items:center;box-shadow:var(--shadow)}
.brand b{font-family:var(--font-d);font-size:15px;line-height:1.2;display:block}
.brand small{font-size:11px;color:var(--muted);font-weight:500;display:block}
.topnav{display:flex;align-items:center;gap:6px}
.topnav a.keep{text-decoration:none;color:var(--ink-soft);font-weight:600;font-size:14px;padding:9px 14px;border-radius:999px;transition:.2s}
.topnav a.keep:hover,.topnav a.keep.active{background:#EEF0FF;color:var(--primary-deep)}
.tg-pill{display:inline-flex;align-items:center;gap:7px;text-decoration:none;font-weight:700;font-size:14px;
  color:#fff;background:linear-gradient(135deg,#229ED9,#1B86BE);padding:9px 16px;border-radius:999px;
  box-shadow:0 8px 18px -8px rgba(34,158,217,.7);transition:transform .2s}
.tg-pill:hover{transform:translateY(-2px)}

/* ---------- Layout shell ---------- */
.shell{max-width:1200px;margin:0 auto;display:flex;gap:26px;padding:0 16px;align-items:flex-start}
.sidebar{position:sticky;top:76px;flex:0 0 250px;max-height:calc(100vh - 96px);overflow:auto;
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);padding:18px 14px;box-shadow:var(--shadow)}
.sidebar h4{font-family:var(--font-d);font-size:12px;letter-spacing:1.5px;text-transform:uppercase;color:var(--muted);margin:4px 8px 12px}
.toc-list a{display:flex;gap:10px;align-items:center;text-decoration:none;color:var(--ink-soft);
  font-size:14px;font-weight:500;padding:9px 10px;border-radius:12px;transition:.18s;border:1px solid transparent}
.toc-list a .n{width:26px;height:26px;flex:0 0 26px;border-radius:8px;display:grid;place-items:center;
  font-size:12px;font-weight:700;background:#EEF0FF;color:var(--primary-deep)}
.toc-list a:hover{background:#F4F5FE}
.toc-list a.active{background:linear-gradient(135deg,var(--primary),#6D28D9);color:#fff;font-weight:700;box-shadow:var(--shadow)}
.toc-list a.active .n{background:rgba(255,255,255,.22);color:#fff}
.content{flex:1 1 auto;min-width:0;max-width:860px;padding-bottom:60px}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;border-radius:28px;margin:22px 0 26px;color:#fff;
  background:linear-gradient(130deg,#1E1B4B 0%,#3730A3 45%,#6D28D9 75%,#4F46E5 100%);
  padding:46px 34px;box-shadow:var(--shadow-lg)}
.hero canvas.particles{position:absolute;inset:0;width:100%;height:100%;opacity:.55}
.hero .orb{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;pointer-events:none;animation:drift 14s ease-in-out infinite alternate}
.orb.o1{width:340px;height:340px;background:#F97316;top:-120px;right:-80px}
.orb.o2{width:280px;height:280px;background:#22D3EE;bottom:-140px;left:-60px;animation-delay:-6s}
@keyframes drift{to{transform:translate(40px,30px) scale(1.12)}}
.hero-inner{position:relative;z-index:2}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:1.2px;
  text-transform:uppercase;color:#FDE68A;background:rgba(234,88,12,.18);border:1px solid rgba(253,230,138,.4);
  padding:7px 14px;border-radius:999px;margin-bottom:16px}
.hero h1{font-family:var(--font-d);font-weight:800;font-size:clamp(28px,5vw,44px);line-height:1.15;margin-bottom:14px;color:#fff}
.hero h1 .grad{background:linear-gradient(92deg,#FDE68A,#FDBA74);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:#E0E7FF;max-width:640px;font-size:16.5px}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.hero-badges span{font-size:13.5px;font-weight:600;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);
  padding:8px 14px;border-radius:999px;backdrop-filter:blur(6px)}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-weight:700;font-size:15px;
  padding:13px 24px;border-radius:14px;transition:transform .2s,box-shadow .2s;cursor:pointer;border:none}
.btn-primary{background:linear-gradient(135deg,var(--accent),#F59E0B);color:#fff;box-shadow:0 12px 26px -10px rgba(234,88,12,.7)}
.btn-ghost{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.35)}
.btn:hover{transform:translateY(-2px)}
.hero-stats{display:flex;flex-wrap:wrap;gap:26px;margin-top:26px;padding-top:22px;border-top:1px solid rgba(255,255,255,.18)}
.hstat b{font-family:var(--font-d);font-size:26px;display:block;color:#FDE68A}
.hstat span{font-size:13px;color:#C7D2FE}
.hero-img{position:absolute;right:0;top:0;bottom:0;width:42%;object-fit:cover;opacity:.28;
  mask-image:linear-gradient(90deg,transparent,#000 55%);-webkit-mask-image:linear-gradient(90deg,transparent,#000 55%)}

/* ---------- Cards ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:30px;margin:0 0 24px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.card::before{content:"";position:absolute;top:0;left:0;right:0;height:5px;
  background:linear-gradient(90deg,var(--primary),#8B5CF6,var(--accent))}
.section-title{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.section-title .ico{width:44px;height:44px;flex:0 0 44px;border-radius:14px;display:grid;place-items:center;font-size:22px;
  background:linear-gradient(135deg,#EEF0FF,#E0E7FF);box-shadow:inset 0 0 0 1px var(--line)}
.card h2{font-family:var(--font-d);font-size:25px;font-weight:700;color:var(--ink);line-height:1.3}
.card h3{font-family:var(--font-d);font-size:21px;margin:22px 0 10px;color:var(--primary-ink)}
.card h4{font-size:16px;margin:18px 0 8px;color:var(--ink)}
.card p{margin:0 0 12px;color:#2C2A52}
.card ul,.card ol{margin:0 0 14px 22px;color:#2C2A52}
.card li{margin-bottom:7px}
.card li::marker{color:var(--primary)}
table{width:100%;border-collapse:separate;border-spacing:0;margin:16px 0;font-size:16.5px;
  border:1px solid var(--line);border-radius:14px;overflow:hidden;display:block;overflow-x:auto}
thead th{background:linear-gradient(135deg,var(--primary),#6D28D9);color:#fff;font-family:var(--font-d);
  font-size:13.5px;padding:12px 14px;text-align:left;white-space:nowrap}
tbody td{padding:11px 14px;border-top:1px solid var(--line);vertical-align:top}
tbody tr:nth-child(even) td{background:#F8F9FF}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:16px 0}
.mini-card{background:#F8F9FF;border:1px solid var(--line);border-radius:var(--r-md);padding:18px;transition:transform .2s,box-shadow .2s}
.mini-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.mini-card h4{margin:0 0 6px;font-family:var(--font-d);font-size:15.5px}
.mini-card p{font-size:14.5px;margin:0;color:var(--muted)}

/* callouts */
.exam,.note,.warn{border-radius:var(--r-md);padding:16px 18px;margin:18px 0;font-size:15.5px;border:1px solid}
.exam{background:#FFFBEB;border-color:#FDE68A;box-shadow:inset 4px 0 0 var(--gold)}
.note{background:#EEF0FF;border-color:#C7D2FE;box-shadow:inset 4px 0 0 var(--primary)}
.warn{background:#FEF2F2;border-color:#FECACA;box-shadow:inset 4px 0 0 var(--rose)}
.exam strong,.note strong,.warn strong{color:var(--ink)}

/* diagrams */
figure.diagram{background:#FAFBFF;border:1px dashed #C7D2FE;border-radius:var(--r-md);
  padding:20px 14px 12px;margin:20px 0;text-align:center}
figure.diagram svg{max-width:100%;height:auto}
.diagram-title{font-family:var(--font-d);font-weight:700;font-size:15px;color:var(--primary-ink);margin-bottom:10px}
figcaption{font-size:13.5px;color:var(--muted);margin-top:10px;line-height:1.6}
.photo-fig{border-radius:var(--r-md);overflow:hidden;margin:20px 0;border:1px solid var(--line);box-shadow:var(--shadow)}
.photo-fig img{width:100%;height:auto;transition:transform .5s}
.photo-fig:hover img{transform:scale(1.03)}

/* ---------- Chapter cards (home) ---------- */
.ch-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-top:16px}
.ch-card{display:flex;flex-direction:column;text-decoration:none;color:var(--ink);background:var(--card);
  border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow);
  transition:transform .25s,box-shadow .25s;position:relative}
.ch-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.ch-card .thumb{height:130px;overflow:hidden;position:relative;background:#E0E7FF}
.ch-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.ch-card:hover .thumb img{transform:scale(1.08)}
.ch-card .thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(30,27,75,.55))}
.ch-card .cnum{position:absolute;top:10px;left:10px;z-index:2;background:rgba(255,255,255,.92);color:var(--primary-deep);
  font-family:var(--font-d);font-weight:800;font-size:12px;padding:5px 11px;border-radius:999px}
.ch-card .cbody{padding:16px 18px 18px}
.ch-card h3{font-family:var(--font-d);font-size:16.5px;margin:0 0 6px;color:var(--ink)}
.ch-card p{font-size:13.5px;color:var(--muted);margin:0 0 10px;line-height:1.55}
.ch-card .go{font-size:13.5px;font-weight:700;color:var(--accent-deep)}
.ch-card .pq{font-size:12px;font-weight:700;color:var(--primary-deep);background:#EEF0FF;
  display:inline-block;padding:3px 10px;border-radius:999px;margin-bottom:8px}

/* ---------- PYQ sections ---------- */
.pyq-zone{margin:34px 0 8px}
.pyq-head-band{display:flex;align-items:center;gap:14px;background:linear-gradient(135deg,#1E1B4B,#4C1D95);
  color:#fff;border-radius:var(--r-lg);padding:22px 24px;margin-bottom:18px;box-shadow:var(--shadow-lg);position:relative;overflow:hidden}
.pyq-head-band::after{content:"✎";position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:64px;opacity:.12}
.pyq-head-band h2{font-family:var(--font-d);font-size:22px;margin:0;color:#fff}
.pyq-head-band p{margin:4px 0 0;color:#C7D2FE;font-size:14px}
.pyq{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);margin:0 0 16px;
  overflow:hidden;box-shadow:var(--shadow);transition:box-shadow .25s;scroll-margin-top:90px}
.pyq:hover{box-shadow:var(--shadow-lg)}
.pyq-top{padding:18px 20px 0}
.pyq-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}
.tag{font-size:12px;font-weight:700;padding:4px 11px;border-radius:999px;letter-spacing:.3px}
.tag.yr{background:linear-gradient(135deg,var(--accent),#F59E0B);color:#fff}
.tag.paper{background:#EEF0FF;color:var(--primary-deep);border:1px solid #C7D2FE}
.tag.marks{background:#ECFDF5;color:#047857;border:1px solid #A7F3D0}
.tag.chap{background:#F5F3FF;color:#6D28D9;border:1px solid #DDD6FE}
.pyq-q{font-family:var(--font-d);font-size:16.5px;font-weight:700;color:var(--ink);line-height:1.5;margin:0 0 4px}
.pyq-q .stars{font-size:14px;letter-spacing:1px}
.pyq-meta{font-size:13px;color:var(--muted);margin-bottom:6px}
.pyq details{border-top:1px dashed var(--line);margin-top:12px}
.pyq summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:10px;
  padding:14px 20px;font-weight:700;font-size:15px;color:var(--primary-deep);user-select:none;-webkit-tap-highlight-color:transparent}
.pyq summary::-webkit-details-marker{display:none}
.pyq summary .arr{margin-left:auto;width:30px;height:30px;flex:0 0 30px;border-radius:50%;display:grid;place-items:center;
  background:#EEF0FF;color:var(--primary-deep);transition:transform .3s;font-size:14px}
.pyq details[open] summary .arr{transform:rotate(180deg);background:var(--primary);color:#fff}
.pyq .ans{padding:4px 20px 22px;font-size:15.5px;color:#2C2A52}
.pyq .ans p{margin:0 0 10px}
.pyq .ans ul,.pyq .ans ol{margin:0 0 12px 20px}
.pyq .ans li{margin-bottom:6px}
.pyq .ans table{font-size:14px}
.ans .key{background:#FFFBEB;border:1px solid #FDE68A;border-radius:10px;padding:10px 14px;margin:12px 0;font-size:14.5px}
.formula{display:block;background:#1E1B4B;color:#FDE68A;font-family:ui-monospace,Menlo,Consolas,monospace;
  font-size:15px;padding:12px 16px;border-radius:12px;margin:12px 0;overflow-x:auto;white-space:nowrap}

/* ---------- Marquee ---------- */
.marquee{overflow:hidden;border-radius:var(--r-lg);margin:0 0 24px;background:linear-gradient(90deg,var(--primary-deep),#6D28D9);
  border:1px solid rgba(255,255,255,.15)}
.marquee-track{display:flex;width:max-content;animation:scrollX 32s linear infinite;padding:14px 0}
.marquee span{color:#E0E7FF;font-size:14.5px;font-weight:600;padding:0 26px;white-space:nowrap;border-right:1px solid rgba(255,255,255,.18)}
@keyframes scrollX{to{transform:translateX(-50%)}}

/* ---------- Telegram band ---------- */
.tg-band{display:flex;align-items:center;gap:18px;border-radius:var(--r-lg);padding:26px;
  background:linear-gradient(135deg,#0E7490,#229ED9);color:#fff;margin:26px 0;box-shadow:var(--shadow-lg);position:relative;overflow:hidden}
.tg-band::before{content:"";position:absolute;width:220px;height:220px;border-radius:50%;background:rgba(255,255,255,.12);right:-60px;top:-60px}
.tg-band h3{font-family:var(--font-d);font-size:19px;margin:0 0 4px;color:#fff}
.tg-band p{margin:0;color:#E0F2FE;font-size:14.5px;position:relative;z-index:1}
.tg-band .big{font-size:44px;position:relative;z-index:1}
.tg-band .btn{background:#fff;color:#0369A1;position:relative;z-index:1;white-space:nowrap}

/* ---------- Prev / next ---------- */
.pn{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:30px 0 10px}
.pn a{text-decoration:none;background:var(--card);border:1px solid var(--line);border-radius:var(--r-md);
  padding:16px 18px;transition:.2s;display:block}
.pn a:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-2px)}
.pn small{display:block;font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;font-weight:700}
.pn b{font-family:var(--font-d);font-size:15px;color:var(--ink)}
.pn .next{text-align:right}

/* ---------- FABs, sheet & mobile nav ---------- */
.fab-toc,.fab-top{position:fixed;z-index:1200;width:54px;height:54px;border-radius:50%;border:none;cursor:pointer;
  display:grid;place-items:center;font-size:22px;box-shadow:var(--shadow-lg);transition:transform .2s,opacity .3s}
.fab-toc{right:18px;bottom:86px;background:linear-gradient(135deg,var(--primary),#7C3AED);color:#fff}
.fab-top{right:18px;bottom:22px;background:#fff;color:var(--primary-deep);border:1px solid var(--line);opacity:0;pointer-events:none}
.fab-top.show{opacity:1;pointer-events:auto}
.fab-toc:active,.fab-top:active{transform:scale(.92)}
.sheet{position:fixed;inset:auto 0 0 0;z-index:1300;background:#fff;border-radius:24px 24px 0 0;max-height:72vh;
  transform:translateY(105%);transition:transform .35s cubic-bezier(.3,.9,.3,1);box-shadow:0 -20px 60px rgba(30,27,75,.35);
  display:flex;flex-direction:column}
.sheet.open{transform:none}
.sheet-handle{width:44px;height:5px;border-radius:99px;background:#D6DBF2;margin:12px auto 4px}
.sheet h4{font-family:var(--font-d);padding:8px 22px 4px;font-size:16px}
.sheet .toc-list{overflow:auto;padding:6px 14px 22px}
.scrim{position:fixed;inset:0;z-index:1250;background:rgba(30,27,75,.45);opacity:0;pointer-events:none;transition:.3s}
.scrim.open{opacity:1;pointer-events:auto}
.mobilenav{display:none}

/* ---------- Footer ---------- */
footer{background:linear-gradient(160deg,#1E1B4B,#312E81);color:#C7D2FE;margin-top:40px}
.foot-inner{max-width:1200px;margin:0 auto;padding:44px 16px 20px;display:grid;grid-template-columns:2fr 1fr 1fr;gap:26px}
footer h4{font-family:var(--font-d);color:#fff;font-size:15px;margin-bottom:12px}
footer p,footer li{font-size:14px}
footer ul{list-style:none}
footer li{margin-bottom:8px}
footer a{color:#E0E7FF;text-decoration:none}
footer a:hover{color:#FDE68A}
.foot-base{border-top:1px solid rgba(255,255,255,.14);text-align:center;padding:16px;font-size:13px;color:#A5B4FC}

/* ---------- Reveal animations ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.visible{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.08s}.reveal[data-d="2"]{transition-delay:.16s}
.reveal[data-d="3"]{transition-delay:.24s}.reveal[data-d="4"]{transition-delay:.32s}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .marquee-track{animation:none}
  .hero .orb{animation:none}
  html{scroll-behavior:auto}
}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .sidebar{display:none}
  .shell{padding:0}
  .content{padding:0 0 90px;max-width:100%}
  .hero{border-radius:0;margin:0 0 18px;padding:34px 18px 30px}
  .hero-img{display:none}
  .card{border-radius:18px;margin:0 12px 16px;padding:22px 16px}
  .pyq-zone{margin:24px 12px 8px}
  .pyq-head-band{margin:0 0 14px;padding:18px}
  .marquee{border-radius:0;margin:0 0 16px}
  .tg-band{margin:20px 12px;border-radius:18px;padding:20px 16px;flex-wrap:wrap}
  .pn{margin:22px 12px 8px}
  .grid2{grid-template-columns:1fr}
  .ch-grid{grid-template-columns:1fr 1fr;gap:12px}
  .topnav a.keep{display:none}
  .mobilenav{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:1200;background:rgba(255,255,255,.94);
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid var(--line);
    padding:8px 6px calc(8px + env(safe-area-inset-bottom))}
  .mobilenav a{flex:1;text-decoration:none;color:var(--muted);font-size:11px;font-weight:600;text-align:center;
    padding:6px 2px;border-radius:10px;display:flex;flex-direction:column;gap:2px;align-items:center}
  .mobilenav a .mi{font-size:19px}
  .mobilenav a.active{color:var(--primary-deep)}
  .fab-toc{bottom:96px}
  .fab-top{bottom:162px}
  body{font-size:18px}
  .card h2{font-size:23px}
}
@media (max-width:520px){
  .ch-grid{grid-template-columns:1fr}
  .hero h1{font-size:27px}
  .hero-stats{gap:16px}
  .pn{grid-template-columns:1fr}
  .pn .next{text-align:left}
  table{font-size:13.5px}
  .pyq-q{font-size:15.5px}
  .pyq summary{padding:12px 14px}
  .pyq .ans{padding:4px 14px 18px}
}

/* ---------- Print (PDF) ---------- */
@media print{
  .reveal,.reveal.visible{opacity:1!important;transform:none!important;transition:none!important}
  #preloader,#scrollbar,.topbar .topnav,.fab-toc,.fab-top,.mobilenav,.sheet,.scrim,
  .tg-band,.tg-pill,.hero canvas.particles,.hero .orb,.hero-cta,.marquee,.hero-img{display:none!important}
  body{background:#fff;font-size:11pt}
  .shell{display:block;max-width:100%;padding:0}
  .sidebar{display:none}
  .content{max-width:100%;padding:0}
  .hero{border-radius:0;margin:0 0 12px;padding:24px;background:#312E81!important;-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .hero h1{font-size:24pt;color:#fff!important}
  .hero p,.kicker{color:#E0E7FF!important}
  .card{box-shadow:none;break-inside:avoid;margin:0 0 14px;padding:18px}
  .pyq{break-inside:avoid}
  .pyq summary{pointer-events:none}
  .pyq summary .arr{display:none}
  .pyq details:not([open])>.ans{display:block!important}
  footer{display:none}
  a{color:#1E1B4B;text-decoration:none}
}