/* AI Code Quality Auditor — one design system, two themes.
 *
 * Why this file exists: every page carried its own inline copy of the same
 * colours, and the three surfaces had drifted into three different looks for
 * the same numbers. An instrument that reports one verdict should look like
 * one instrument.
 *
 * Two themes, because the page has two audiences. Dark is for a projector in
 * a lit room. Light is for a screenshot that has to sit in a dissertation
 * appendix and survive being printed in greyscale, which is why every band
 * carries a glyph as well as a colour.
 *
 * Defaults to the reader's system setting, overridden by [data-theme] on
 * <html> and remembered per browser.
 */

/* ---------------------------------------------------------------- tokens */

:root {
  /* Light is the base, because print and the appendix are the harder case. */
  --ground:      #ffffff;
  --raised:      #fbfaf9;
  --sunken:      #f3f1ee;
  --rule:        #e3e0db;
  --rule-strong: #cdc8c0;

  --ink:         #16130f;
  --ink-soft:    #4a443c;
  --ink-faint:   #857d72;

  --accent:      #4c35d4;
  --accent-ink:  #ffffff;
  --accent-wash: #efecff;

  --good:        #1a7f4b;
  --good-wash:   #e8f5ed;
  --warn:        #9a6309;
  --warn-wash:   #fdf2e0;
  --risk:        #b3261e;
  --risk-wash:   #fdeceb;
  --unknown:     #57534e;
  --unknown-wash:#f1efec;

  --shadow-1: 0 1px 2px rgba(22, 19, 15, .05), 0 1px 1px rgba(22, 19, 15, .04);
  --shadow-2: 0 12px 28px -18px rgba(22, 19, 15, .28), 0 2px 6px -4px rgba(22, 19, 15, .12);

  --display: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  /* An 8px grid, named so a layout cannot invent its own spacing. */
  --s1: .25rem; --s2: .5rem;  --s3: .75rem; --s4: 1rem;
  --s5: 1.5rem; --s6: 2rem;   --s7: 3rem;   --s8: 4rem;
  --radius: 10px;
  --radius-lg: 16px;
  --measure: 68ch;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground:      #0a0b10;
    --raised:      #12141c;
    --sunken:      #171a24;
    --rule:        #242834;
    --rule-strong: #343a4a;

    --ink:         #eceef4;
    --ink-soft:    #a8aebf;
    --ink-faint:   #6e748a;

    --accent:      #9d8cff;
    --accent-ink:  #14101f;
    --accent-wash: #1b1733;

    --good:        #4ade80;
    --good-wash:   #12251b;
    --warn:        #f5b74f;
    --warn-wash:   #2a2113;
    --risk:        #ff6b61;
    --risk-wash:   #2d1615;
    --unknown:     #8b91a4;
    --unknown-wash:#1c1f28;

    --shadow-1: 0 1px 2px rgba(0, 0, 0, .4);
    --shadow-2: 0 18px 40px -22px rgba(0, 0, 0, .75), 0 2px 8px -4px rgba(0, 0, 0, .5);
  }
}

:root[data-theme="dark"] {
  --ground:      #0a0b10;
  --raised:      #12141c;
  --sunken:      #171a24;
  --rule:        #242834;
  --rule-strong: #343a4a;

  --ink:         #eceef4;
  --ink-soft:    #a8aebf;
  --ink-faint:   #6e748a;

  --accent:      #9d8cff;
  --accent-ink:  #14101f;
  --accent-wash: #1b1733;

  --good:        #4ade80;
  --good-wash:   #12251b;
  --warn:        #f5b74f;
  --warn-wash:   #2a2113;
  --risk:        #ff6b61;
  --risk-wash:   #2d1615;
  --unknown:     #8b91a4;
  --unknown-wash:#1c1f28;

  --shadow-1: 0 1px 2px rgba(0, 0, 0, .4);
  --shadow-2: 0 18px 40px -22px rgba(0, 0, 0, .75), 0 2px 8px -4px rgba(0, 0, 0, .5);
}

/* ----------------------------------------------------------------- base */

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

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

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Every figure in this instrument is a number that gets compared to another
 * number in the row above it, so the digits have to line up. */
.num, table, .metric-value, .stat-value {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }

h1, h2, h3 { font-weight: 400; letter-spacing: -.015em; margin: 0; line-height: 1.15; }
h1 { font-family: var(--display); font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-family: var(--display); font-size: clamp(1.35rem, 3vw, 1.75rem); }
h3 { font-family: var(--sans); font-size: 1rem; font-weight: 600; letter-spacing: 0; }

p { margin: 0 0 var(--s4); max-width: var(--measure); }
code, kbd, pre { font-family: var(--mono); font-size: .875em; }
code { background: var(--sunken); padding: .1em .35em; border-radius: 4px; }

.lead { font-size: 1.0625rem; color: var(--ink-soft); max-width: var(--measure); }
.muted { color: var(--ink-faint); }
.mono  { font-family: var(--mono); }

/* An eyebrow: the small all-caps label above a heading. */
.eyebrow {
  font-size: .6875rem; font-weight: 600; letter-spacing: .09em;
  text-transform: uppercase; color: var(--ink-faint);
  margin-bottom: var(--s2);
}

/* --------------------------------------------------------------- layout */

.wrap { max-width: 1200px; margin: 0 auto; padding: var(--s6) var(--s5) var(--s8); }
.wrap-narrow { max-width: 820px; }
.stack > * + * { margin-top: var(--s5); }
.row { display: flex; align-items: center; gap: var(--s3); flex-wrap: wrap; }
.spread { display: flex; align-items: center; justify-content: space-between; gap: var(--s4); flex-wrap: wrap; }

.section { padding-top: var(--s6); }
.section + .section { border-top: 1px solid var(--rule); margin-top: var(--s6); }

.grid { display: grid; gap: var(--s4); }
.grid-cards { grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); }
.grid-stats { grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); }

/* ----------------------------------------------------------------- nav */

.topbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--ground) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--rule);
}
.topbar-inner {
  max-width: 1200px; margin: 0 auto; padding: var(--s3) var(--s5);
  display: flex; align-items: center; justify-content: space-between; gap: var(--s4);
}
.brand { display: flex; align-items: center; gap: var(--s3); font-weight: 600; letter-spacing: -.01em; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 7px; flex: none;
  background: conic-gradient(from 210deg, var(--accent), var(--good), var(--warn), var(--accent));
  box-shadow: var(--shadow-1);
}
.brand small { display: block; font-weight: 400; font-size: .75rem; color: var(--ink-faint); letter-spacing: 0; }

/* ---------------------------------------------------------------- cards */

.card {
  background: var(--raised);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: var(--s5);
  box-shadow: var(--shadow-1);
}
a.card { color: inherit; text-decoration: none; display: block; transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease; }
a.card:hover { transform: translateY(-2px); border-color: var(--rule-strong); box-shadow: var(--shadow-2); }
a.card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* A single headline figure. */
.stat { background: var(--raised); border: 1px solid var(--rule); border-radius: var(--radius); padding: var(--s4); }
.stat-label { font-size: .75rem; color: var(--ink-faint); font-weight: 500; }
.stat-value { font-family: var(--display); font-size: 2rem; line-height: 1.1; margin-top: var(--s1); }
.stat-note  { font-size: .75rem; color: var(--ink-faint); margin-top: var(--s1); }

/* ---------------------------------------------------- bands and verdicts */

/* Colour is never the only carrier: each band has a glyph, so the page still
 * reads in greyscale and to a reader who cannot distinguish red from green. */
.band {
  display: inline-flex; align-items: center; gap: .4em;
  font-size: .75rem; font-weight: 600; letter-spacing: .02em;
  padding: .2em .6em .25em; border-radius: 999px;
  border: 1px solid transparent; white-space: nowrap;
}
.band::before { font-size: .9em; line-height: 1; }
.band-good    { color: var(--good);    background: var(--good-wash);    border-color: color-mix(in srgb, var(--good) 28%, transparent); }
.band-good::before { content: "●"; }
.band-warn    { color: var(--warn);    background: var(--warn-wash);    border-color: color-mix(in srgb, var(--warn) 28%, transparent); }
.band-warn::before { content: "▲"; }
.band-critical, .band-risk { color: var(--risk); background: var(--risk-wash); border-color: color-mix(in srgb, var(--risk) 28%, transparent); }
.band-critical::before, .band-risk::before { content: "■"; }
.band-unknown { color: var(--unknown); background: var(--unknown-wash); border-color: var(--rule); }
.band-unknown::before { content: "○"; }

.tag {
  font-size: .6875rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em;
  padding: .2em .55em; border-radius: 6px;
  background: var(--sunken); color: var(--ink-faint); border: 1px solid var(--rule);
}
.tag-accent { background: var(--accent-wash); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }

/* ---------------------------------------------------------------- tables */

table { width: 100%; border-collapse: collapse; font-size: .875rem; }
thead th {
  text-align: left; font-size: .6875rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .07em; color: var(--ink-faint);
  padding: 0 var(--s3) var(--s2); border-bottom: 1px solid var(--rule-strong);
  white-space: nowrap;
}
tbody td { padding: var(--s3); border-bottom: 1px solid var(--rule); vertical-align: top; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: var(--sunken); }
td.right, th.right { text-align: right; }
.table-scroll { overflow-x: auto; margin-inline: calc(var(--s3) * -1); padding-inline: var(--s3); }

/* ----------------------------------------------------------- the toggle */

.theme-toggle {
  display: inline-flex; align-items: center; gap: var(--s2);
  background: var(--raised); border: 1px solid var(--rule);
  border-radius: 999px; padding: .25rem; cursor: pointer;
  color: var(--ink-soft);
}
.theme-toggle button {
  all: unset; cursor: pointer; display: grid; place-items: center;
  width: 28px; height: 24px; border-radius: 999px; font-size: .8rem;
  color: var(--ink-faint); transition: background .14s ease, color .14s ease;
}
.theme-toggle button[aria-pressed="true"] { background: var(--accent-wash); color: var(--accent); }
.theme-toggle button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* -------------------------------------------------------------- motion */

@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.rise { animation: rise .4s cubic-bezier(.2, .7, .2, 1) both; }
.rise-2 { animation-delay: .06s; }
.rise-3 { animation-delay: .12s; }
.rise-4 { animation-delay: .18s; }

@media (prefers-reduced-motion: reduce) {
  .rise, .rise-2, .rise-3, .rise-4 { animation: none; }
  a.card:hover { transform: none; }
}

/* ---------------------------------------------------------------- print */

@media print {
  :root { --ground: #fff; --raised: #fff; --ink: #000; }
  .topbar, .theme-toggle, .no-print { display: none !important; }
  .wrap { padding: 0; max-width: none; }
  .card { border: 1px solid #bbb; box-shadow: none; break-inside: avoid; }
  a { text-decoration: none; color: #000; }
}

@media (max-width: 640px) {
  .wrap { padding: var(--s5) var(--s4) var(--s7); }
  .topbar-inner { padding: var(--s3) var(--s4); }
}