/* ============================================================
   UPESSC TGT English — Website Stylesheet (v2, enhanced)
   ============================================================ */
:root{
  --navy:#16294d; --navy2:#1F3864; --blue:#2E5496; --blue-soft:#eaf0fb;
  --gold:#C9A227; --gold-soft:#FBF3D6; --thead:#DDE6F7;
  --bg:#eef1f7; --card:#ffffff; --line:#e2e6ef; --ink:#1c2436; --muted:#697086;
  --ok:#2e7d46; --warn:#c9851f; --bad:#b3322c;
  --sidebar:300px;
  --radius:12px; --shadow:0 6px 18px rgba(24,40,75,.08);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{margin:0;font-family:'Segoe UI',system-ui,-apple-system,Calibri,Arial,sans-serif;
  font-size:16.5px;line-height:1.65;color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;}

/* ---------- Top bar ---------- */
.topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:12px;height:50px;
  background:linear-gradient(90deg,var(--navy),var(--blue));color:#fff;padding:0 16px;
  box-shadow:0 2px 10px rgba(0,0,0,.18);}
.topbar-title{font-weight:600;font-size:15px;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.menu-btn{display:none;background:transparent;border:0;color:#fff;font-size:22px;cursor:pointer;padding:2px 6px;}
.ans-btn{background:var(--gold);color:#231c00;border:0;border-radius:20px;padding:7px 16px;
  font-weight:700;cursor:pointer;font-size:13px;white-space:nowrap;box-shadow:0 2px 6px rgba(0,0,0,.18);}
.ans-btn:hover{filter:brightness(1.06);}
#progress{position:fixed;top:50px;left:0;height:3px;width:0;background:var(--gold);z-index:45;transition:width .08s linear;}

/* ---------- Layout ---------- */
.layout{display:flex;align-items:flex-start;}
.sidebar{width:var(--sidebar);flex:0 0 var(--sidebar);position:sticky;top:50px;
  height:calc(100vh - 50px);overflow-y:auto;background:#fff;border-right:1px solid var(--line);padding:14px 10px;}
.content{flex:1;max-width:920px;margin:0 auto;padding:26px 34px 70px;min-width:0;}

/* ---------- Sidebar ---------- */
.side-brand{padding:6px 8px 10px;border-bottom:1px solid var(--line);margin-bottom:8px;}
.side-brand a{display:block;font-weight:800;color:var(--navy);text-decoration:none;font-size:17px;}
.side-brand span{display:block;font-size:12px;color:var(--muted);}
#navSearch{width:100%;padding:9px 12px;border:1px solid var(--line);border-radius:8px;margin:4px 0 10px;font-size:13px;background:#f7f9fd;}
#navSearch:focus{outline:2px solid var(--blue-soft);border-color:var(--blue);}
.side-nav a{display:block;padding:7px 11px;margin:1px 0;color:#33405a;text-decoration:none;
  border-radius:8px;font-size:13.5px;border-left:3px solid transparent;transition:.12s;}
.side-nav a:hover{background:var(--blue-soft);}
.side-nav a.active{background:linear-gradient(90deg,var(--blue-soft),#fff);color:var(--navy);
  font-weight:700;border-left-color:var(--gold);}
.side-nav a b{color:var(--blue);}
.side-part{font-size:11px;font-weight:700;letter-spacing:.6px;text-transform:uppercase;
  color:var(--muted);padding:13px 11px 4px;}

/* ---------- Home hero ---------- */
.hero{position:relative;overflow:hidden;background:radial-gradient(circle at 80% -20%,#36589c,transparent 60%),linear-gradient(135deg,var(--navy),var(--blue));
  color:#fff;border-radius:18px;padding:50px 30px;text-align:center;margin-bottom:30px;box-shadow:0 14px 34px rgba(22,41,77,.30);}
.hero-kicker{letter-spacing:3px;font-size:12px;opacity:.85;margin:0;}
.hero-title{font-size:44px;margin:10px 0 4px;color:#fff;border:0;font-weight:800;letter-spacing:.5px;}
.hero-sub{font-size:20px;font-style:italic;opacity:.96;margin:0;}
.hero-exam{font-size:13px;opacity:.82;margin:14px auto 0;max-width:560px;}
.hero-stats{display:flex;justify-content:center;gap:36px;margin:28px 0;flex-wrap:wrap;}
.hero-stats div{display:flex;flex-direction:column;}
.hero-stats b{font-size:32px;color:var(--gold);font-weight:800;}
.hero-stats span{font-size:12px;opacity:.85;}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;}
.btn{display:inline-block;padding:12px 24px;border-radius:24px;text-decoration:none;font-weight:700;
  background:rgba(255,255,255,.15);color:#fff;border:1px solid rgba(255,255,255,.45);transition:.15s;}
.btn:hover{background:rgba(255,255,255,.26);transform:translateY(-1px);}
.btn.primary{background:var(--gold);color:#231c00;border-color:var(--gold);box-shadow:0 6px 16px rgba(201,162,39,.4);}
.hero .hero-title,.hero .hero-sub,.hero .hero-kicker,.hero .hero-exam{color:#fff;}
.hero .btn{color:#fff;} .hero .btn.primary{color:#231c00;}

/* ---------- Home TOC ---------- */
.toc-head{margin-top:10px;font-size:24px;color:var(--navy);}
.toc-group{margin:18px 0;}
.toc-group h3{color:var(--navy);font-size:14px;text-transform:uppercase;letter-spacing:.6px;
  border-bottom:2px solid var(--gold);padding-bottom:5px;}
.toc-list{display:grid;grid-template-columns:1fr 1fr;gap:10px;}
.toc-item{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);
  border-radius:11px;padding:11px 14px;text-decoration:none;color:var(--ink);transition:.14s;box-shadow:0 1px 2px rgba(0,0,0,.03);}
.toc-item:hover{border-color:var(--blue);box-shadow:var(--shadow);transform:translateY(-2px);}
.toc-num{flex:0 0 34px;height:34px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;border-radius:9px;font-weight:800;font-size:15px;}
.toc-ttl{flex:1;font-weight:600;font-size:14.5px;}
.toc-meta{font-size:11px;color:#fff;background:var(--blue);padding:2px 8px;border-radius:12px;}

/* ---------- Chapter hero ---------- */
.ch-hero{position:relative;overflow:hidden;background:radial-gradient(circle at 90% -30%,#3a5da0,transparent 55%),linear-gradient(135deg,var(--navy),var(--blue));
  color:#fff;border-radius:16px;padding:30px 32px;margin-bottom:26px;box-shadow:0 12px 30px rgba(22,41,77,.30);}
.ch-hero-bg{position:absolute;right:14px;top:-34px;font-size:160px;font-weight:900;color:rgba(255,255,255,.10);line-height:1;user-select:none;pointer-events:none;}
.ch-hero-in{position:relative;z-index:1;}
.ch-part{display:inline-block;font-size:11.5px;letter-spacing:1px;text-transform:uppercase;
  background:rgba(255,255,255,.16);padding:4px 12px;border-radius:20px;border:1px solid rgba(255,255,255,.22);}
.ch-hero .ch-eyebrow{margin:12px 0 2px;font-size:14px;font-weight:600;letter-spacing:3px;opacity:.85;text-transform:uppercase;}
.ch-title{font-size:32px;font-weight:800;margin:0;line-height:1.15;}
.ch-chips{margin-top:16px;display:flex;gap:10px;flex-wrap:wrap;}
.ch-chips span{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.26);padding:6px 13px;border-radius:20px;font-size:13px;}

/* ---------- Chapter content ---------- */
.content h1{font-size:28px;color:var(--navy);border-bottom:3px solid var(--gold);padding-bottom:8px;}
.content h2{font-size:20px;color:var(--navy);font-weight:800;margin-top:34px;
  background:linear-gradient(90deg,var(--blue-soft),rgba(234,240,251,0));
  border-left:5px solid var(--gold);padding:9px 16px;border-radius:0 10px 10px 0;}
.content h3{font-size:17px;color:var(--blue);margin-top:24px;display:inline-block;
  border-bottom:2px solid var(--gold-soft);padding-bottom:2px;}
.content p{margin:10px 0;}
.content ol,.content ul{padding-left:24px;}
.content li{margin:4px 0;}
.content a{color:var(--blue);}
.content b{color:#10203f;}

/* tables */
.content table{border-collapse:separate;border-spacing:0;width:100%;margin:14px 0;font-size:14.5px;
  display:block;overflow-x:auto;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);}
.content th,.content td{border-bottom:1px solid #e6e9f1;border-right:1px solid #eef0f5;padding:8px 11px;text-align:left;vertical-align:top;}
.content th{background:var(--thead);color:var(--navy);font-weight:700;position:sticky;top:0;}
.content tr:last-child td{border-bottom:0;}
.content td:last-child,.content th:last-child{border-right:0;}
.content tr:nth-child(even) td{background:#f7f9fd;}

/* note + passage */
.note{background:var(--gold-soft);padding:11px 15px;border-left:4px solid var(--gold);
  border-radius:0 10px 10px 0;margin:14px 0;box-shadow:0 1px 2px rgba(0,0,0,.03);}
.passage{background:#eef2f9;padding:14px 18px;border-left:4px solid var(--blue);
  border-radius:0 10px 10px 0;margin:16px 0;box-shadow:var(--shadow);font-size:15.5px;}

/* difficulty section badges (set by JS) */
.lvl{border:0 !important;border-bottom:0 !important;border-radius:22px !important;color:#fff !important;
  padding:7px 18px !important;font-size:14px;font-weight:700;margin-top:24px;box-shadow:0 3px 8px rgba(0,0,0,.12);}
.lvl-easy{background:var(--ok);} .lvl-mod{background:var(--warn);} .lvl-hard{background:var(--bad);}

/* MCQ cards (wrapped by JS) */
.mcq{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--blue);
  border-radius:11px;padding:13px 17px;margin:14px 0;box-shadow:0 1px 3px rgba(0,0,0,.04);transition:.12s;}
.mcq:hover{box-shadow:var(--shadow);border-left-color:var(--gold);}
.mcq .q{margin:0 0 6px;font-weight:700;color:#13203c;}
.mcq-body{margin:0;}
.answer{display:block;margin-top:9px;background:#e9f6ee;border-left:3px solid var(--ok);
  padding:7px 12px;border-radius:8px;color:#15532f;font-size:14.5px;}
body.hide-answers .answer{display:none;}
body.hide-answers .mcq-body::after{content:"🔒 Answer hidden — tap “Show Answers”.";
  color:var(--muted);font-style:italic;font-size:13px;display:block;margin-top:8px;}

/* about page */
.aboutsec{background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:6px 24px 20px;margin:18px 0;box-shadow:var(--shadow);}

/* pager */
.pager{display:flex;justify-content:space-between;gap:12px;margin-top:40px;flex-wrap:wrap;}
.pn{flex:1;min-width:210px;background:var(--card);border:1px solid var(--line);border-radius:11px;
  padding:13px 17px;text-decoration:none;color:var(--navy);font-weight:600;font-size:14px;transition:.14s;}
.pn:hover{border-color:var(--blue);box-shadow:var(--shadow);transform:translateY(-2px);}
.pn.next{text-align:right;}
.pn small{display:block;font-size:11px;color:var(--muted);font-weight:600;letter-spacing:.5px;text-transform:uppercase;}
.foot{margin-top:36px;padding-top:14px;border-top:1px solid var(--line);color:var(--muted);font-size:12.5px;text-align:center;}

/* back to top */
#toTop{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;
  background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;border:0;font-size:20px;cursor:pointer;
  opacity:0;pointer-events:none;transition:.2s;box-shadow:0 6px 16px rgba(0,0,0,.28);z-index:50;}
#toTop.show{opacity:1;pointer-events:auto;}
#toTop:hover{transform:translateY(-2px);}

/* backdrop (mobile) */
.backdrop{display:none;position:fixed;inset:50px 0 0 0;background:rgba(0,0,0,.42);z-index:25;}

/* responsive */
@media (max-width:980px){ .toc-list{grid-template-columns:1fr;} }
@media (max-width:860px){
  .menu-btn{display:block;}
  .sidebar{position:fixed;left:0;top:50px;z-index:30;transform:translateX(-100%);transition:.25s;box-shadow:4px 0 18px rgba(0,0,0,.2);}
  body.nav-open .sidebar{transform:translateX(0);}
  body.nav-open .backdrop{display:block;}
  .content{padding:18px 16px 60px;}
  .hero-title{font-size:34px;} .ch-title{font-size:26px;}
}