/* exam.4ab.in — ABC Question Bank
   Design tokens. Same "AB Editorial" language as aniketbhardwaj.com:
   navy + gold, Georgia display serif, card-first layout.

   Theme: light by default, dark via prefers-color-scheme, and either one
   forced by [data-theme] so the toggle wins in both directions. Every colour
   is defined on bare :root first — a colour whose only definition lives
   inside a media query has no value when the query does not match. */

:root {
  /* brand */
  --navy:    #1B2A5E;
  --navy-2:  #2C4390;
  --gold:    #C9A84C;
  --green:   #16A34A;
  --red:     #DC2626;
  --amber:   #D97706;

  /* surfaces */
  --bg:      #F6F7FB;
  --card:    #FFFFFF;
  --card-2:  #FBFCFE;
  --line:    #E3E7EF;
  --line-2:  #EDF0F5;

  /* type */
  --ink:     #141A2B;
  --body:    #3A4152;
  --muted:   #6B7280;
  --on-navy: #FFFFFF;

  /* accents used for state chips */
  --chip-bg:      rgba(27, 42, 94, .06);
  --chip-line:    rgba(27, 42, 94, .14);
  --focus:        #2C4390;
  --shadow-sm:    0 1px 2px rgba(16, 24, 48, .06);
  --shadow-md:    0 2px 6px rgba(16, 24, 48, .07), 0 10px 26px rgba(16, 24, 48, .06);

  /* the crop sits on white no matter the theme — the source page is white,
     so a dark backing would frame it with a hard bright edge */
  --crop-bg: #FFFFFF;

  --wrap: 1500px;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;

  --serif: Georgia, "Times New Roman", Times, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --navy:    #DCE6F7;
    --navy-2:  #A9C0EA;
    --bg:      #0B111F;
    --card:    #141C30;
    --card-2:  #18213A;
    --line:    #263450;
    --line-2:  #1E2A44;
    --ink:     #EEF2F8;
    --body:    #C2CDE1;
    --muted:   #8FA0BC;
    --on-navy: #0B111F;
    --chip-bg:   rgba(220, 230, 247, .07);
    --chip-line: rgba(220, 230, 247, .16);
    --focus:     #A9C0EA;
    --green:   #34D399;
    --red:     #F87171;
    --amber:   #FBBF24;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
    --shadow-md: 0 2px 6px rgba(0, 0, 0, .35), 0 10px 26px rgba(0, 0, 0, .3);
  }
}

:root[data-theme="dark"] {
  --navy:    #DCE6F7;
  --navy-2:  #A9C0EA;
  --bg:      #0B111F;
  --card:    #141C30;
  --card-2:  #18213A;
  --line:    #263450;
  --line-2:  #1E2A44;
  --ink:     #EEF2F8;
  --body:    #C2CDE1;
  --muted:   #8FA0BC;
  --on-navy: #0B111F;
  --chip-bg:   rgba(220, 230, 247, .07);
  --chip-line: rgba(220, 230, 247, .16);
  --focus:     #A9C0EA;
  --green:   #34D399;
  --red:     #F87171;
  --amber:   #FBBF24;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, .35), 0 10px 26px rgba(0, 0, 0, .3);
}

/* ---------- reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--body);
  font: 15px/1.6 var(--sans);
  -webkit-text-size-adjust: 100%;
}
h1, h2, h3, h4 { font-family: var(--serif); color: var(--ink); margin: 0 0 .5em; line-height: 1.25; }
a { color: var(--navy); }
img { max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* ---------- shared components ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
}
.chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 9px; border-radius: 999px;
  background: var(--chip-bg); border: 1px solid var(--chip-line);
  font-size: 11.5px; font-weight: 600; color: var(--navy);
  letter-spacing: .01em; white-space: nowrap;
}
.chip--warn  { background: rgba(217, 119, 6, .12);  border-color: rgba(217, 119, 6, .3);  color: var(--amber); }
.chip--good  { background: rgba(22, 163, 74, .12);  border-color: rgba(22, 163, 74, .3);  color: var(--green); }
.chip--bad   { background: rgba(220, 38, 38, .12);  border-color: rgba(220, 38, 38, .3);  color: var(--red); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 9px 16px; border-radius: 10px; cursor: pointer;
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  font-size: 14px; font-weight: 600; text-decoration: none;
  transition: background .12s ease, border-color .12s ease, transform .06s ease;
}
.btn:hover  { background: var(--card-2); border-color: var(--chip-line); }
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--navy); border-color: var(--navy); color: var(--on-navy);
}
.btn--primary:hover { background: var(--navy-2); border-color: var(--navy-2); }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

.muted { color: var(--muted); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}