/* ============================================================================
   MrChemCoach - syllabus hub pages
   © Mr ChemCoach EdTech Pvt Ltd. All rights reserved.

   One stylesheet shared by the five syllabus pages, so a student who lands on
   the IGCSE page and moves to the CBSE one pays no second download. Same design
   tokens as the benches, kept deliberately small: these pages are what search
   engines see first, so they have to paint fast.
   ========================================================================== */
:root{
 --void:#07090c; --surface:#0d1117; --surface-2:#121821; --surface-3:#182029;
 --line:rgba(255,255,255,.085); --line-2:rgba(255,255,255,.16);
 --text:#e9eff4; --text-2:#96a4b2; --text-3:#7d8b99; --text-4:#5c6b79;
 --accent:#ff3e7f; --accent-soft:rgba(255,62,127,.13); --accent-2:#39e7c4; --accent-3:#8b5cf6;
 --glow:0 0 40px -8px rgba(255,62,127,.45); --ring:rgba(255,62,127,.35);
 --f-display:'Sora',system-ui,sans-serif;
 --f-body:'Inter',system-ui,-apple-system,sans-serif;
 --f-mono:'JetBrains Mono',ui-monospace,SFMono-Regular,monospace;
 --r:14px; --maxw:1140px;
}
*,*::before,*::after{box-sizing:border-box}
body{
  margin:0;background:var(--void);color:var(--text);font-family:var(--f-body);
  font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:5px}
::selection{background:var(--accent);color:#fff}
img,svg{max-width:100%}

/* --------------------------------------------------------------- masthead */
.mcc-mast{
  position:sticky;top:0;z-index:140;display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  width:100%;max-width:var(--maxw);margin:0 auto 26px;padding:11px clamp(14px,2.4vw,20px);
  min-height:66px;background:rgba(7,9,12,.9);border:1px solid var(--line);border-radius:var(--r);
  -webkit-backdrop-filter:blur(16px) saturate(1.4);backdrop-filter:blur(16px) saturate(1.4);
}
.mcc-mark{display:flex;align-items:center;gap:10px;flex:none}
.mcc-mark-dot{
  width:28px;height:28px;border-radius:8px;display:grid;place-items:center;flex:none;color:#fff;
  background:linear-gradient(140deg,var(--accent),var(--accent-3));box-shadow:var(--glow);
}
.mcc-mark-name{font-family:var(--f-display);font-weight:700;font-size:1.1rem;letter-spacing:-.04em;white-space:nowrap}
.mcc-mast-mid{display:flex;flex-direction:column;gap:3px;min-width:0;flex:1 1 auto;padding-left:14px;border-left:1px solid var(--line)}
.mcc-mast-title{margin:0;font-family:var(--f-display);font-weight:600;font-size:1.02rem;letter-spacing:-.02em;line-height:1.3}
.mcc-mast-badge{font-family:var(--f-mono);font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;color:var(--text-3)}
.mcc-back{
  display:inline-flex;align-items:center;gap:7px;flex:none;white-space:nowrap;
  font-family:var(--f-mono);font-size:.63rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-2);border:1px solid var(--line);padding:9px 14px;border-radius:100px;transition:.18s;
}
.mcc-back:hover{color:var(--text);border-color:var(--line-2);background:var(--surface-2)}
.mcc-back svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}

/* ------------------------------------------------------------------ shell */
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 clamp(14px,2.4vw,20px)}
.crumbs{
  display:flex;flex-wrap:wrap;gap:7px;align-items:center;margin:0 0 20px;padding:0;list-style:none;
  font-family:var(--f-mono);font-size:.6rem;letter-spacing:.13em;text-transform:uppercase;color:var(--text-4);
}
.crumbs a{color:var(--text-3)}
.crumbs a:hover{color:var(--accent)}
.crumbs li::after{content:"/";margin-left:7px;color:var(--text-4);opacity:.6}
.crumbs li:last-child::after{content:none}

.hero{padding:8px 0 34px;border-bottom:1px solid var(--line);margin-bottom:34px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:100px;
  border:1px solid var(--line);background:var(--accent-soft);
  font-family:var(--f-mono);font-size:.6rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);
}
h1{
  margin:18px 0 0;font-family:var(--f-display);font-weight:700;letter-spacing:-.04em;line-height:1.08;
  font-size:clamp(1.85rem,4.4vw,3rem);max-width:22ch;
}
.lede{margin:16px 0 0;max-width:62ch;font-size:clamp(1rem,1.6vw,1.1rem);color:var(--text-2)}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.hero-meta span{
  font-family:var(--f-mono);font-size:.63rem;letter-spacing:.11em;text-transform:uppercase;
  color:var(--text-3);border:1px solid var(--line);padding:7px 12px;border-radius:8px;
}
.cta{
  display:inline-flex;align-items:center;gap:9px;margin-top:24px;padding:13px 22px;border-radius:10px;
  background:linear-gradient(180deg,var(--accent),#e21f63);color:#fff;box-shadow:var(--glow);
  font-family:var(--f-display);font-weight:600;font-size:.92rem;transition:transform .18s;
}
.cta:hover{transform:translateY(-1px)}

section{margin-bottom:46px}
h2{
  margin:0 0 8px;font-family:var(--f-display);font-weight:600;letter-spacing:-.03em;line-height:1.18;
  font-size:clamp(1.3rem,2.6vw,1.75rem);
}
h3{margin:0 0 6px;font-family:var(--f-display);font-weight:600;font-size:1rem;letter-spacing:-.02em}
.sub{margin:0 0 22px;color:var(--text-2);max-width:62ch}
p{margin:0 0 14px}

/* ------------------------------------------------------------ topic table */
.map{display:grid;gap:12px}
.row{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:6px 22px;
  padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:var(--surface);
}
.row .t{min-width:0}
.row .t b{display:block;font-family:var(--f-display);font-size:.98rem;letter-spacing:-.02em;margin-bottom:4px}
.row .t span{color:var(--text-3);font-size:.88rem}
.row .l{min-width:0;display:flex;flex-wrap:wrap;gap:7px;align-content:flex-start}
.row .l a{
  display:inline-flex;align-items:center;gap:7px;padding:7px 12px;border-radius:8px;
  border:1px solid var(--line);background:var(--surface-2);font-size:.83rem;
  color:var(--text-2);transition:.16s;
}
.row .l a:hover{color:var(--text);border-color:var(--ring);background:var(--accent-soft)}
.row .l a i{width:6px;height:6px;border-radius:50%;background:var(--accent-2);flex:none}
@media(max-width:720px){.row{grid-template-columns:minmax(0,1fr)}}

/* ------------------------------------------------------------- lab cards */
.cards{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(min(100%,272px),1fr))}
.card{
  display:flex;flex-direction:column;padding:18px;border:1px solid var(--line);border-radius:12px;
  background:var(--surface);transition:border-color .16s,transform .16s,background .16s;
}
.card:hover{border-color:var(--line-2);background:var(--surface-2);transform:translateY(-2px)}
.card .tag{
  font-family:var(--f-mono);font-size:.56rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--text-4);margin-bottom:9px;
}
.card h3{margin-bottom:6px}
.card p{margin:0;color:var(--text-3);font-size:.87rem;line-height:1.5}
.card .go{
  margin-top:14px;font-family:var(--f-mono);font-size:.6rem;letter-spacing:.13em;
  text-transform:uppercase;color:var(--accent);
}

/* -------------------------------------------------------------------- faq */
.faq{display:grid;gap:10px}
.faq details{border:1px solid var(--line);border-radius:12px;background:var(--surface);overflow:hidden}
.faq summary{
  cursor:pointer;padding:15px 18px;font-family:var(--f-display);font-weight:600;font-size:.97rem;
  letter-spacing:-.015em;list-style:none;display:flex;justify-content:space-between;gap:14px;align-items:center;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--accent);font-size:1.15rem;line-height:1;flex:none}
.faq details[open] summary::after{content:"\2013"}
.faq .a{padding:0 18px 16px;color:var(--text-2);font-size:.92rem}
.faq .a p:last-child{margin-bottom:0}

/* ------------------------------------------------------------ other hubs */
.hubs{display:flex;flex-wrap:wrap;gap:9px}
.hubs a{
  padding:9px 14px;border-radius:100px;border:1px solid var(--line);background:var(--surface);
  font-size:.85rem;color:var(--text-2);transition:.16s;
}
.hubs a:hover{color:var(--text);border-color:var(--ring);background:var(--accent-soft)}

/* ----------------------------------------------------------------- footer */
.mcc-foot{width:100%;max-width:var(--maxw);margin:52px auto 0;padding:30px clamp(14px,2.4vw,20px) 26px;border-top:1px solid var(--line)}
.mcc-foot-top{display:flex;flex-wrap:wrap;gap:28px 54px;margin-bottom:26px}
.mcc-foot-top > div{min-width:170px}
.mcc-foot-tag{margin:12px 0 0;color:var(--text-3);font-size:.88rem;max-width:34ch}
.mcc-foot h5{
  margin:0 0 12px;font-family:var(--f-mono);font-size:.6rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--text-3);font-weight:500;
}
.mcc-foot ul{margin:0;padding:0;list-style:none;display:grid;gap:8px;color:var(--text-2);font-size:.9rem}
.mcc-foot a:hover{color:var(--accent)}
.mcc-colophon{
  display:flex;flex-wrap:wrap;gap:10px 22px;justify-content:space-between;padding-top:20px;
  border-top:1px solid var(--line);font-size:.78rem;color:var(--text-3);
}
@media(max-width:820px){
  body{font-size:15.5px}
  .mcc-mast-mid{flex:1 1 100%;order:3;padding-left:0;border-left:0}
  h1{max-width:none}
}
@media(prefers-reduced-motion:reduce){*{transition:none !important;animation:none !important}}