/* ==========================================================================
   Arthzo — banking exam preparation
   Design language: bank ledger. Ruled rows, ink navy, brass, paper.
   ========================================================================== */

:root {
  --ink:        #10243A;
  --ink-soft:   #1C3A57;
  --ink-mute:   #5A7086;
  --paper:      #FBFAF7;
  --paper-2:    #F3F0E8;
  --paper-3:    #EAE5D9;
  --rule:       #DCD5C6;
  --rule-firm:  #C3B99F;
  --brass:      #A67C2E;
  --brass-lift: #C9A961;
  --green:      #1F6B4A;
  --green-bg:   #E8F1EC;
  --seal:       #8C2F27;
  --seal-bg:    #F7EAE8;

  --shell: 1140px;
  --gut: 24px;

  --t-xs:   0.8125rem;
  --t-sm:   0.9375rem;
  --t-base: 1.0625rem;
  --t-md:   1.25rem;
  --t-lg:   1.5rem;
  --t-xl:   2rem;
  --t-2xl:  2.75rem;
  --t-3xl:  3.5rem;

  --sans: "Mukta", system-ui, -apple-system, sans-serif;
  --slab: "Bitter", Georgia, serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--t-base);
  line-height: 1.65;
  font-weight: 400;
}

h1, h2, h3, h4 {
  font-family: var(--slab);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0 0 0.5em;
  text-wrap: balance;
}

p { margin: 0 0 1em; max-width: 68ch; }

a { color: var(--ink); text-decoration-color: var(--brass); text-underline-offset: 3px; }
a:hover { color: var(--brass); }

:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
}

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gut);
}

.skip {
  position: absolute; left: -9999px;
  background: var(--ink); color: var(--paper);
  padding: 10px 16px; z-index: 100;
}
.skip:focus { left: 12px; top: 12px; }

/* ---------------------------------------------------------------- masthead */

.masthead {
  background: var(--ink);
  color: var(--paper);
  border-bottom: 3px solid var(--brass);
}

.masthead .shell {
  display: flex;
  align-items: center;
  gap: 32px;
  min-height: 68px;
  flex-wrap: wrap;
}

.wordmark {
  font-family: var(--slab);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--paper);
  text-decoration: none;
  letter-spacing: -0.02em;
  display: flex;
  align-items: baseline;
  gap: 7px;
}
.wordmark span {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--brass-lift);
  letter-spacing: 0.04em;
}
.wordmark:hover { color: var(--paper); }

.nav {
  display: flex;
  gap: 26px;
  margin-left: auto;
  align-items: center;
  flex-wrap: wrap;
}
.nav a {
  color: #C6D2DE;
  text-decoration: none;
  font-size: var(--t-sm);
  font-weight: 500;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}
.nav a:hover { color: var(--paper); border-bottom-color: var(--brass); }
.nav a[aria-current="page"] { color: var(--paper); border-bottom-color: var(--brass); }

/* ---------------------------------------------------------------- hero */

.hero {
  background: var(--ink);
  color: var(--paper);
  padding: 68px 0 76px;
  background-image:
    repeating-linear-gradient(to bottom, transparent 0 43px, rgba(255,255,255,.035) 43px 44px);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 56px;
  align-items: start;
}

.hero h1 {
  font-size: clamp(2.1rem, 5.2vw, var(--t-3xl));
  color: var(--paper);
  margin-bottom: 20px;
}

.hero-lede {
  font-size: var(--t-md);
  color: #C6D2DE;
  max-width: 48ch;
  margin-bottom: 30px;
}

.hero-credential {
  border-left: 3px solid var(--brass);
  padding: 4px 0 4px 16px;
  margin-bottom: 32px;
  font-size: var(--t-sm);
  color: #AFC0D0;
  max-width: 44ch;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: var(--t-sm);
  font-weight: 600;
  padding: 12px 22px;
  border: 1.5px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  text-decoration: none;
  transition: background-color .14s ease, color .14s ease, border-color .14s ease;
}
.btn-brass { background: var(--brass); color: #1A1206; border-color: var(--brass); }
.btn-brass:hover { background: var(--brass-lift); color: #1A1206; border-color: var(--brass-lift); }
.btn-ghost { background: transparent; color: var(--paper); border-color: #47617C; }
.btn-ghost:hover { background: rgba(255,255,255,.07); color: var(--paper); border-color: var(--brass); }
.btn-ink { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-ink:hover { background: var(--ink-soft); color: var(--paper); border-color: var(--ink-soft); }
.btn-quiet { background: transparent; color: var(--ink); border-color: var(--rule-firm); }
.btn-quiet:hover { background: var(--paper-2); color: var(--ink); border-color: var(--ink); }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* ---------------------------------------------------------------- sample question card */

.specimen {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--rule-firm);
  border-top: 3px solid var(--brass);
  padding: 26px 26px 22px;
}

.specimen-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--rule);
  font-size: var(--t-xs);
  color: var(--ink-mute);
  font-weight: 600;
}

.specimen-q {
  font-size: var(--t-base);
  font-weight: 500;
  margin-bottom: 18px;
  line-height: 1.55;
}

.opts { display: grid; gap: 8px; margin-bottom: 18px; }

.opt {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  width: 100%;
  text-align: left;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 11px 14px;
  font: inherit;
  font-size: var(--t-sm);
  color: var(--ink);
  cursor: pointer;
  transition: border-color .12s ease, background-color .12s ease;
}
.opt:hover:not(:disabled) { border-color: var(--ink-mute); background: var(--paper-2); }
.opt .tag {
  flex: 0 0 auto;
  width: 22px; height: 22px;
  display: grid; place-items: center;
  border: 1px solid var(--rule-firm);
  border-radius: 50%;
  font-size: var(--t-xs);
  font-weight: 700;
  line-height: 1;
}
.opt[aria-pressed="true"] { border-color: var(--ink); background: var(--paper-2); }
.opt[aria-pressed="true"] .tag { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.opt.is-right { border-color: var(--green); background: var(--green-bg); }
.opt.is-right .tag { background: var(--green); color: #fff; border-color: var(--green); }
.opt.is-wrong { border-color: var(--seal); background: var(--seal-bg); }
.opt.is-wrong .tag { background: var(--seal); color: #fff; border-color: var(--seal); }
.opt:disabled { cursor: default; }

.verdict {
  font-family: var(--slab);
  font-weight: 700;
  font-size: var(--t-sm);
  margin-bottom: 8px;
}
.verdict.right { color: var(--green); }
.verdict.wrong { color: var(--seal); }

.explain {
  border-top: 1px solid var(--rule);
  padding-top: 16px;
  font-size: var(--t-sm);
  line-height: 1.62;
}
.explain p { max-width: none; }
.explain .concept {
  background: var(--paper-2);
  border-left: 3px solid var(--brass);
  padding: 12px 14px;
  margin: 12px 0 10px;
}
.explain .cite {
  font-size: var(--t-xs);
  color: var(--ink-mute);
}
[hidden] { display: none !important; }

/* ---------------------------------------------------------------- sections */

.band { padding: 62px 0; border-top: 1px solid var(--rule); }
.band-tint { background: var(--paper-2); }

.band-head { margin-bottom: 34px; max-width: 62ch; }
.band-head h2 { font-size: clamp(1.6rem, 3.4vw, var(--t-xl)); }
.band-head p { color: var(--ink-mute); margin-bottom: 0; }

/* ---------------------------------------------------------------- ledger rows */

.ledger { border-top: 2px solid var(--ink); }

.ledger-row {
  display: grid;
  grid-template-columns: 190px minmax(0,1fr) auto;
  gap: 28px;
  align-items: center;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  color: inherit;
}
a.ledger-row:hover { background: var(--paper-2); color: inherit; }
a.ledger-row:hover .ledger-title { color: var(--brass); }

.ledger-key {
  font-family: var(--slab);
  font-weight: 700;
  font-size: var(--t-md);
  line-height: 1.2;
}
.ledger-key small {
  display: block;
  font-family: var(--sans);
  font-size: var(--t-xs);
  font-weight: 500;
  color: var(--ink-mute);
  margin-top: 3px;
  letter-spacing: 0;
}
.ledger-title { font-weight: 600; margin-bottom: 2px; }
.ledger-note { font-size: var(--t-sm); color: var(--ink-mute); }
.ledger-meta {
  font-size: var(--t-sm);
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  text-align: right;
}

/* ---------------------------------------------------------------- paper table */

.papers { width: 100%; border-collapse: collapse; font-size: var(--t-sm); }
.papers caption { text-align: left; color: var(--ink-mute); padding-bottom: 10px; font-size: var(--t-sm); }
.papers th {
  text-align: left;
  font-weight: 600;
  font-size: var(--t-xs);
  color: var(--ink-mute);
  padding: 0 14px 8px 0;
  border-bottom: 2px solid var(--ink);
}
.papers td {
  padding: 14px 14px 14px 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.papers td:last-child, .papers th:last-child { padding-right: 0; text-align: right; }
.papers .pname { font-weight: 600; }
.papers .pcode { color: var(--ink-mute); font-size: var(--t-xs); }
.papers .num { font-variant-numeric: tabular-nums; white-space: nowrap; }

.pill {
  display: inline-block;
  font-size: var(--t-xs);
  font-weight: 600;
  padding: 3px 9px;
  border: 1px solid var(--rule-firm);
  border-radius: 2px;
  color: var(--ink-mute);
  background: var(--paper);
}
.pill-live { color: var(--green); border-color: var(--green); background: var(--green-bg); }
.pill-soon { color: var(--brass); border-color: var(--brass-lift); }

/* ---------------------------------------------------------------- reasons */

.reasons { display: grid; gap: 0; border-top: 2px solid var(--ink); }
.reason {
  display: grid;
  grid-template-columns: 34px minmax(0,1fr);
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--rule);
}
.reason-mark {
  font-family: var(--slab);
  font-weight: 700;
  color: var(--brass);
  font-size: var(--t-md);
  line-height: 1.3;
}
.reason h3 { font-size: var(--t-md); margin-bottom: 6px; }
.reason p { color: var(--ink-mute); margin-bottom: 0; font-size: var(--t-sm); }

/* ---------------------------------------------------------------- page head */

.pagehead {
  background: var(--ink);
  color: var(--paper);
  padding: 52px 0 46px;
}
.pagehead h1 { color: var(--paper); font-size: clamp(1.9rem, 4.4vw, var(--t-2xl)); }
.pagehead p { color: #C6D2DE; max-width: 60ch; margin-bottom: 0; }
.crumbs { font-size: var(--t-xs); color: #8AA0B5; margin-bottom: 14px; }
.crumbs a { color: #8AA0B5; text-decoration: none; }
.crumbs a:hover { color: var(--brass-lift); }

.facts {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid #2C4762;
}
.fact-n {
  font-family: var(--slab);
  font-size: var(--t-lg);
  font-weight: 700;
  color: var(--brass-lift);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.fact-l { font-size: var(--t-xs); color: #8AA0B5; }

/* ---------------------------------------------------------------- footer */

.foot {
  background: var(--ink);
  color: #A5B7C8;
  padding: 46px 0 30px;
  font-size: var(--t-sm);
  margin-top: 0;
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 34px;
  padding-bottom: 28px;
  border-bottom: 1px solid #2C4762;
}
.foot h4 { color: var(--paper); font-size: var(--t-sm); font-family: var(--sans); font-weight: 600; margin-bottom: 10px; }
.foot ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.foot a { color: #A5B7C8; text-decoration: none; }
.foot a:hover { color: var(--brass-lift); }
.foot-base { padding-top: 20px; font-size: var(--t-xs); color: #7A8FA3; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ==========================================================================
   Test engine
   ========================================================================== */

.exam-bar {
  position: sticky; top: 0; z-index: 40;
  background: var(--ink);
  color: var(--paper);
  border-bottom: 2px solid var(--brass);
}
.exam-bar .shell {
  display: flex; align-items: center; gap: 20px;
  min-height: 60px; flex-wrap: wrap;
}
.exam-name { font-family: var(--slab); font-weight: 700; font-size: var(--t-sm); }
.exam-sub { font-size: var(--t-xs); color: #8AA0B5; }

.clock {
  margin-left: auto;
  display: flex; align-items: baseline; gap: 9px;
  font-variant-numeric: tabular-nums;
}
.clock-t { font-family: var(--slab); font-size: var(--t-lg); font-weight: 700; letter-spacing: 0.01em; }
.clock-l { font-size: var(--t-xs); color: #8AA0B5; }
.clock.low .clock-t { color: #F0A8A0; }
.clock.crit .clock-t { color: #FF9A8F; }

.exam-grid {
  display: grid;
  grid-template-columns: minmax(0,1fr) 252px;
  gap: 40px;
  padding: 34px 0 70px;
  align-items: start;
}

.qcard { border-top: 2px solid var(--ink); padding-top: 20px; }
.qmeta {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 14px; flex-wrap: wrap;
  font-size: var(--t-xs); color: var(--ink-mute); font-weight: 600;
  margin-bottom: 14px;
}
.qnum { font-family: var(--slab); font-size: var(--t-md); color: var(--ink); font-variant-numeric: tabular-nums; }
.qtext { font-size: var(--t-md); font-weight: 500; line-height: 1.5; margin-bottom: 20px; }

.qnav {
  display: flex; gap: 10px; flex-wrap: wrap;
  padding-top: 20px; margin-top: 22px;
  border-top: 1px solid var(--rule);
}
.qnav .spacer { flex: 1 1 auto; }

.palette { position: sticky; top: 86px; }
.palette h3 { font-size: var(--t-sm); font-family: var(--sans); font-weight: 600; margin-bottom: 12px; }
.palette-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  margin-bottom: 18px;
}
.pbtn {
  aspect-ratio: 1;
  border: 1px solid var(--rule-firm);
  background: var(--paper);
  border-radius: 2px;
  font: inherit; font-size: var(--t-xs); font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--ink-mute);
  cursor: pointer;
  display: grid; place-items: center;
}
.pbtn:hover { border-color: var(--ink); }
.pbtn.answered { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.pbtn.flagged { background: var(--brass); color: #1A1206; border-color: var(--brass); }
.pbtn.current { outline: 2px solid var(--brass); outline-offset: 1px; }

.key { display: grid; gap: 6px; font-size: var(--t-xs); color: var(--ink-mute); margin-bottom: 20px; }
.key div { display: flex; align-items: center; gap: 8px; }
.key i { width: 12px; height: 12px; border: 1px solid var(--rule-firm); border-radius: 2px; display: inline-block; }
.key .k-ans { background: var(--ink); border-color: var(--ink); }
.key .k-flag { background: var(--brass); border-color: var(--brass); }
.key .k-none { background: var(--paper); }

.tally {
  border-top: 1px solid var(--rule);
  padding-top: 14px;
  font-size: var(--t-sm);
  display: grid; gap: 5px;
  margin-bottom: 18px;
}
.tally div { display: flex; justify-content: space-between; }
.tally b { font-variant-numeric: tabular-nums; }

/* ---------------------------------------------------------------- results */

.score-head {
  display: grid;
  grid-template-columns: auto minmax(0,1fr);
  gap: 40px;
  align-items: center;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  padding: 30px 0;
  margin-bottom: 0;
}
.score-big {
  font-family: var(--slab);
  font-size: 3.4rem;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.score-of { font-size: var(--t-sm); color: var(--ink-mute); }
.score-line { font-size: var(--t-md); font-weight: 600; margin-bottom: 4px; }
.score-note { color: var(--ink-mute); font-size: var(--t-sm); margin-bottom: 0; }

.bars { display: grid; gap: 14px; }
.bar-row { display: grid; grid-template-columns: minmax(120px, 200px) minmax(0,1fr) 62px; gap: 14px; align-items: center; font-size: var(--t-sm); }
.bar-track { height: 9px; background: var(--paper-3); border-radius: 1px; overflow: hidden; }
.bar-fill { height: 100%; background: var(--ink); }
.bar-fill.weak { background: var(--seal); }
.bar-fill.mid { background: var(--brass); }
.bar-fill.strong { background: var(--green); }
.bar-val { text-align: right; font-variant-numeric: tabular-nums; color: var(--ink-mute); }

.review { border-top: 2px solid var(--ink); }
.rev-item { border-bottom: 1px solid var(--rule); padding: 22px 0; }
.rev-head { display: flex; gap: 12px; align-items: baseline; margin-bottom: 10px; font-size: var(--t-xs); font-weight: 600; }
.rev-n { font-family: var(--slab); font-size: var(--t-sm); color: var(--ink); }
.rev-status { font-weight: 700; }
.rev-status.ok { color: var(--green); }
.rev-status.no { color: var(--seal); }
.rev-status.skip { color: var(--ink-mute); }
.rev-q { font-weight: 500; margin-bottom: 12px; }

.notice {
  background: var(--paper-2);
  border: 1px solid var(--rule-firm);
  border-left: 3px solid var(--brass);
  padding: 16px 18px;
  font-size: var(--t-sm);
  margin-bottom: 22px;
}
.notice p:last-child { margin-bottom: 0; }

.loading { padding: 70px 0; text-align: center; color: var(--ink-mute); }

/* ---------------------------------------------------------------- responsive */

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 38px; }
  .exam-grid { grid-template-columns: 1fr; gap: 26px; }
  .palette { position: static; }
  .palette-grid { grid-template-columns: repeat(10, 1fr); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .ledger-row { grid-template-columns: 1fr; gap: 8px; }
  .ledger-meta { text-align: left; }
  .score-head { grid-template-columns: 1fr; gap: 18px; }
}

@media (max-width: 560px) {
  :root { --gut: 18px; }
  .hero { padding: 44px 0 50px; }
  .band { padding: 44px 0; }
  .nav { gap: 16px; }
  .palette-grid { grid-template-columns: repeat(8, 1fr); }
  .foot-grid { grid-template-columns: 1fr; gap: 24px; }
  .bar-row { grid-template-columns: minmax(90px,1fr) 62px; }
  .bar-track { grid-column: 1 / -1; }
  .papers .hide-sm { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}