:root{
  --ink:#1a1a1a;          /* near-black text */
  --ink-2:#33332f;
  --paper:#faf8f4;        /* JC warm near-white */
  --paper-2:#f3f0e7;
  --brass:#f0c14b;        /* JC muted gold */
  --brass-light:#f5d175;
  --brass-deep:#b8902f;   /* readable gold on light bg */
  --teal:#2f5d62;
  --rule:#e6e2d6;
  --ink-soft:rgba(26,26,26,.62);
  --correct:#2f6b4f;
  --correct-bg:rgba(47,107,79,.1);
  --wrong:#9e3b34;
  --wrong-bg:rgba(158,59,52,.09);
  --display:'Poppins',sans-serif;
  --serif:'Newsreader',Georgia,serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:var(--serif);font-size:19px;line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
::selection{background:var(--brass);color:var(--ink)}
.wrap{max-width:1180px;margin:0 auto;padding:0 32px}

/* nav */
nav{position:sticky;top:0;z-index:50;background:rgba(250,248,244,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--rule)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{font-family:var(--display);font-weight:600;font-size:20px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink);display:flex;align-items:baseline;gap:2px;text-decoration:none}
.brand .dot{color:var(--brass-deep)}
.nav-links{display:flex;gap:36px;align-items:center}
.nav-links a{color:var(--ink);text-decoration:none;font-family:var(--display);font-size:17px;font-weight:500;letter-spacing:0;opacity:.82;transition:opacity .2s}
.nav-links a:hover{opacity:1}
.nav-links a.active{opacity:1;color:var(--brass-deep)}
.nav-cta{background:var(--brass);color:var(--ink)!important;padding:11px 22px;border-radius:0;opacity:1!important;font-weight:600!important;transition:background .2s}
.nav-cta:hover{background:var(--brass-light)}

/* page header */
.pyq-head{padding:60px 0 40px;border-bottom:1px solid var(--rule)}
.eyebrow{font-family:var(--display);font-size:13px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:var(--brass-deep);margin-bottom:20px;display:flex;align-items:center;gap:14px}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--brass)}
h1.title{font-family:var(--display);font-weight:600;font-size:clamp(38px,5vw,60px);line-height:1.12;letter-spacing:-.01em;color:var(--ink);margin-bottom:20px}
h1.title em{font-style:normal;color:var(--ink);font-weight:600}
.lede{font-family:var(--serif);font-size:21px;color:var(--ink-soft);max-width:600px;line-height:1.6}

/* chapter picker (hub) */
.picker{padding:44px 0 90px}
.picker-label{font-size:12px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:var(--brass-deep);margin-bottom:22px;display:block}
.chapter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.chap-link{
  display:flex;align-items:center;gap:14px;text-align:left;text-decoration:none;
  background:#fff;border:1px solid var(--rule);border-radius:0;
  padding:18px 20px;transition:all .18s;color:var(--ink);
}
.chap-link:hover{border-color:var(--brass);transform:translateY(-2px);box-shadow:0 10px 24px rgba(26,26,26,.07)}
.chap-link:hover .chap-no{color:var(--brass-deep)}
.chap-no{font-family:var(--display);font-weight:700;font-size:18px;color:var(--brass-deep);min-width:30px}
.chap-name{font-size:14px;font-weight:500;line-height:1.25}

/* chapter page */
.panel{padding:56px 0 100px;scroll-margin-top:84px}
.back-link{display:inline-flex;align-items:center;gap:8px;color:var(--ink-soft);text-decoration:none;font-size:14px;font-weight:600;margin-bottom:30px;transition:color .2s}
.back-link:hover{color:var(--brass)}
.chap-header{margin-bottom:8px}
.chap-eyebrow{font-size:12px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--brass-deep);margin-bottom:12px;display:block}
.chap-title{font-family:var(--display);font-weight:600;font-size:clamp(28px,3.6vw,44px);line-height:1.15;letter-spacing:-.005em;color:var(--ink)}

/* chapter nav (prev/next) */
.chap-pager{display:flex;justify-content:space-between;gap:16px;margin-top:70px;border-top:1px solid var(--rule);padding-top:28px}
.pager-btn{display:flex;flex-direction:column;gap:4px;text-decoration:none;color:var(--ink);max-width:46%;transition:opacity .2s}
.pager-btn:hover{opacity:.6}
.pager-btn.next{text-align:right;margin-left:auto}
.pager-dir{font-size:11px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--brass-deep)}
.pager-name{font-family:var(--display);font-weight:500;font-size:17px;line-height:1.2}
.pager-btn.disabled{visibility:hidden}

/* section heads */
.block{margin-top:54px}
.block-head{display:flex;align-items:baseline;gap:16px;border-bottom:2px solid var(--ink);padding-bottom:12px;margin-bottom:8px}
.block-head h2{font-family:var(--display);font-weight:600;font-size:26px;color:var(--ink);letter-spacing:-.01em}
.block-head .tag{font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-soft);margin-left:auto}

/* prelims */
.quiz-meta{display:flex;align-items:center;gap:18px;margin:22px 0 30px;flex-wrap:wrap}
.score-pill{background:#fff;border:1px solid var(--rule);border-radius:40px;padding:9px 20px;font-size:14px;font-weight:600;color:var(--ink)}
.score-pill b{color:var(--brass-deep)}
.reset-btn{background:none;border:none;color:var(--ink-soft);font-family:var(--display);font-size:13px;font-weight:600;cursor:pointer;text-decoration:underline;text-underline-offset:3px}
.reset-btn:hover{color:var(--ink)}
.q{background:#fff;border:1px solid var(--rule);border-radius:0;padding:26px 28px;margin-bottom:18px}
.q-num{font-family:var(--display);font-weight:600;font-size:14px;color:var(--brass-deep);letter-spacing:.03em;margin-bottom:8px}
.q-text{font-size:17px;font-weight:500;color:var(--ink);margin-bottom:18px;line-height:1.5}
.q-meta-src{font-size:12px;color:var(--ink-soft);font-weight:500;margin-left:8px}
.opts{display:flex;flex-direction:column;gap:10px}
.opt{display:flex;align-items:flex-start;gap:13px;cursor:pointer;background:var(--paper);border:1px solid var(--rule);border-radius:0;padding:14px 16px;transition:all .15s;font-size:15px;color:var(--ink-2)}
.opt:hover:not(.locked){border-color:var(--brass)}
.opt .key{font-family:var(--display);font-weight:600;font-size:14px;color:var(--brass-deep);min-width:18px}
.opt.locked{cursor:default}
.opt.correct{background:var(--correct-bg);border-color:var(--correct)}
.opt.correct .key{color:var(--correct)}
.opt.wrong{background:var(--wrong-bg);border-color:var(--wrong)}
.opt.wrong .key{color:var(--wrong)}
.opt .mark{margin-left:auto;font-weight:700;font-size:14px}
.opt.correct .mark{color:var(--correct)}
.opt.wrong .mark{color:var(--wrong)}
.explain{margin-top:16px;padding:14px 16px;background:var(--paper);border-left:3px solid var(--brass);border-radius:0 2px 2px 0;font-family:var(--serif);font-size:17px;color:var(--ink-2);line-height:1.6;display:none}
.explain.show{display:block}
.explain b{font-family:'Inter';font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--brass-deep);display:block;margin-bottom:5px}

/* mains */
.mains-list{display:flex;flex-direction:column;gap:0;border-top:1px solid var(--rule);margin-top:24px}
.main-q{display:flex;gap:20px;padding:22px 0;border-bottom:1px solid var(--rule)}
.main-q .mq-num{font-family:var(--display);font-weight:600;font-size:18px;color:var(--brass-deep);min-width:32px}
.main-q .mq-body{flex:1}
.main-q .mq-text{font-family:var(--serif);font-size:19px;color:var(--ink);line-height:1.55}
.main-q .mq-src{font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--ink-soft);margin-top:8px;display:inline-block}
.mains-empty{font-family:var(--serif);font-size:19px;color:var(--ink-soft);padding:24px 0 0}

.placeholder-note{background:var(--paper-2);border:1px dashed var(--brass);border-radius:0;padding:16px 20px;font-size:14px;color:var(--ink-soft);margin:24px 0 0;font-family:'Inter'}
.placeholder-note b{color:var(--brass-deep)}

/* footer */
footer{background:var(--paper-2);color:var(--ink);padding:48px 0 32px;border-top:1px solid var(--rule)}
.foot-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:18px}
.foot-brand{font-family:var(--display);font-weight:600;font-size:20px;letter-spacing:.12em;text-transform:uppercase}
.foot-brand .dot{color:var(--brass-deep)}
.foot-links{display:flex;gap:28px}
.foot-links a{font-family:var(--display);color:var(--ink);opacity:.78;text-decoration:none;font-size:16px;transition:opacity .2s}
.foot-links a:hover{opacity:1}
.foot-copy{width:100%;border-top:1px solid var(--rule);margin-top:30px;padding-top:22px;font-family:var(--serif);font-size:15px;color:var(--ink-soft)}

@media(max-width:640px){
  .wrap{padding:0 22px}
  .nav-links{gap:18px}
  .nav-links a:not(.nav-cta){display:none}
  .nav-links a.active{display:inline}
  .chapter-grid{grid-template-columns:1fr 1fr}
  .chap-name{font-size:13px}
  .q{padding:20px}
  .foot-inner{flex-direction:column;align-items:flex-start}
}

/* ===== Practice pages: question tables & difficulty pills ===== */
.q-table{
  width:100%;border-collapse:collapse;margin:14px 0 4px;
  font-family:var(--display,inherit);font-size:15px;
}
.q-table th,.q-table td{
  border:1px solid var(--rule);padding:8px 12px;text-align:left;vertical-align:top;
  line-height:1.45;
}
.q-table th{background:var(--paper-2);font-weight:600;color:var(--ink)}
.q-table td{color:var(--ink)}

.q-meta-src.diff-easy{color:#3a7d44}
.q-meta-src.diff-moderate{color:var(--brass-deep)}
.q-meta-src.diff-difficult{color:#b3402f}