/* Review Agent — visual direction: engineering dossier.
 *
 * Warm paper ground, deep ink text, one saturated signal colour used only for
 * semantics (unverified / action required / refused), never decoration. Two
 * typefaces from the system stack, paired for a reason: a serif for answer
 * prose, because reviewers read long answers end to end, and a monospace for
 * every path, label and identifier, because in this app those are literal
 * strings the reader may need to retype. No third face, no accent-for-its-own
 * sake, no card grid — the page is a document, laid out like one.
 */

:root {
  color-scheme: light dark;

  --paper:        oklch(97.2% 0.008 85);
  --paper-raised: oklch(99.4% 0.004 85);
  --paper-sunk:   oklch(94.2% 0.010 85);
  --ink:          oklch(24% 0.018 265);
  --ink-soft:     oklch(46% 0.016 265);
  --ink-faint:    oklch(62% 0.014 265);
  --rule:         oklch(88% 0.010 265);
  --rule-strong:  oklch(78% 0.014 265);

  --signal:       oklch(48% 0.16 258);   /* interactive: links, focus, submit */
  --signal-deep:  oklch(38% 0.15 258);
  --warn:         oklch(56% 0.14 72);    /* NOT VERIFIED */
  --warn-wash:    oklch(94% 0.045 82);
  --alarm:        oklch(52% 0.19 22);    /* ACTION REQUIRED */
  --alarm-wash:   oklch(94% 0.045 25);

  --serif: ui-serif, Georgia, "Iowan Old Style", "Source Serif 4", Cambria, serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Inter, sans-serif;

  --measure: 66ch;
  --gap-hair: 0.35rem;
  --gap-tight: 0.75rem;
  --gap: 1.35rem;
  --gap-wide: clamp(2.5rem, 1.5rem + 4vw, 5rem);

  --step--1: clamp(0.78rem, 0.76rem + 0.09vw, 0.84rem);
  --step-0:  clamp(1rem, 0.97rem + 0.16vw, 1.09rem);
  --step-1:  clamp(1.2rem, 1.1rem + 0.5vw, 1.5rem);
  --step-2:  clamp(1.7rem, 1.4rem + 1.4vw, 2.6rem);
  --step-3:  clamp(2.4rem, 1.7rem + 3.2vw, 4.2rem);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --fast: 130ms;
  --slow: 320ms;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:        oklch(19% 0.014 265);
    --paper-raised: oklch(23.5% 0.016 265);
    --paper-sunk:   oklch(15.5% 0.012 265);
    --ink:          oklch(93% 0.010 85);
    --ink-soft:     oklch(76% 0.012 265);
    --ink-faint:    oklch(58% 0.014 265);
    --rule:         oklch(31% 0.016 265);
    --rule-strong:  oklch(42% 0.020 265);
    --signal:       oklch(76% 0.13 250);
    --signal-deep:  oklch(85% 0.11 250);
    --warn:         oklch(80% 0.12 78);
    --warn-wash:    oklch(28% 0.045 75);
    --alarm:        oklch(75% 0.15 25);
    --alarm-wash:   oklch(27% 0.055 25);
  }
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: var(--step-0)/1.65 var(--sans);
  -webkit-text-size-adjust: 100%;
}

/* A faint horizontal ruling, like the pad this review would otherwise be
 * written on. Cheap, static, and it stops the page reading as a blank void. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background: repeating-linear-gradient(
    to bottom, transparent 0 31px, oklch(50% 0.02 265 / 0.05) 31px 32px);
  mask-image: linear-gradient(to bottom, transparent, black 22rem);
}

code { font-family: var(--mono); font-size: 0.9em; }

.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;
}

.eyebrow {
  margin: 0;
  font-family: var(--mono);
  font-size: var(--step--1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* ---------------------------------------------------------------- controls */

button {
  font: 600 var(--step--1)/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--paper-raised);
  background: var(--signal);
  border: 1px solid transparent;
  border-radius: 2px;
  padding: 0.85em 1.5em;
  cursor: pointer;
  transition: background var(--fast) var(--ease), transform var(--fast) var(--ease);
}
button:hover { background: var(--signal-deep); }
button:active { transform: translateY(1px); }

input[type="password"], textarea {
  width: 100%;
  font: var(--step-0)/1.5 var(--sans);
  color: var(--ink);
  background: var(--paper-raised);
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  padding: 0.75rem 0.9rem;
  transition: border-color var(--fast) var(--ease), box-shadow var(--fast) var(--ease);
}
textarea { font-family: var(--sans); resize: vertical; min-height: 5.5rem; }
input:hover, textarea:hover { border-color: var(--ink-faint); }

:where(input, textarea, button, summary, a):focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}
input:focus-visible, textarea:focus-visible {
  border-color: var(--signal);
  box-shadow: 0 0 0 3px oklch(from var(--signal) l c h / 0.16);
  outline: none;
}

/* -------------------------------------------------------------- login gate */

body.gate {
  display: grid;
  place-items: center;
  min-height: 100dvh;
  padding: var(--gap);
  background:
    radial-gradient(120% 90% at 15% 0%, var(--paper-raised), transparent 60%),
    var(--paper);
}

.gate-panel {
  position: relative;
  z-index: 1;
  width: min(38rem, 100%);
  padding: clamp(1.75rem, 1rem + 3vw, 3.5rem);
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--signal);
  box-shadow: 0 1px 1px oklch(0% 0 0 / 0.04), 0 18px 44px -28px oklch(0% 0 0 / 0.45);
}

.gate-title {
  margin: var(--gap-tight) 0 var(--gap);
  font: 400 var(--step-3)/0.98 var(--serif);
  letter-spacing: -0.02em;
}
.gate-title em { font-style: italic; color: var(--ink-soft); }

.gate-lede {
  margin: 0 0 var(--gap-wide);
  max-width: 34ch;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: var(--step-1);
  line-height: 1.45;
}

.gate-form { display: grid; gap: var(--gap-tight); }
.gate-form label {
  font-family: var(--mono);
  font-size: var(--step--1);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.gate-form button { justify-self: start; margin-top: var(--gap-hair); }

.gate-error {
  margin: var(--gap) 0 0;
  padding: 0.7rem 0.9rem;
  border-left: 3px solid var(--alarm);
  background: var(--alarm-wash);
  color: var(--ink);
  font-size: var(--step--1);
}

.gate-foot {
  margin: var(--gap-wide) 0 0;
  padding-top: var(--gap);
  border-top: 1px solid var(--rule);
  color: var(--ink-faint);
  font-size: var(--step--1);
  max-width: 46ch;
}

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

.masthead {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--gap);
  flex-wrap: wrap;
  padding: var(--gap) clamp(1rem, 0.4rem + 2.5vw, 3.5rem) var(--gap-tight);
  border-bottom: 1px solid var(--rule);
  background: linear-gradient(var(--paper-raised), var(--paper));
}
.masthead h1 {
  margin: 0.15em 0 0;
  font: 400 var(--step-2)/1 var(--serif);
  letter-spacing: -0.015em;
}
.signout button {
  color: var(--ink-soft);
  background: transparent;
  border-color: var(--rule-strong);
}
.signout button:hover { color: var(--paper-raised); background: var(--ink-soft); }

/* ------------------------------------------------------------------ stage */

.stage {
  position: relative;
  z-index: 1;
  width: min(72rem, 100%);
  margin-inline: auto;
  padding: var(--gap-wide) clamp(1rem, 0.4rem + 2.5vw, 3.5rem) 4rem;
}

.opening { max-width: var(--measure); }
.opening h2 {
  margin: 0 0 var(--gap);
  font: 400 var(--step-2)/1.1 var(--serif);
  letter-spacing: -0.015em;
}
.opening p { color: var(--ink-soft); max-width: var(--measure); }
.opening-lang { font-family: var(--serif); font-style: italic; }

.starters {
  margin: var(--gap-wide) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule);
}
.starters li {
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: var(--step--1);
  color: var(--ink-soft);
}
.starters li::before { content: "→ "; color: var(--ink-faint); }

/* ------------------------------------------------------------------ turns */

.thread { display: grid; gap: var(--gap-wide); }

.turn {
  display: grid;
  gap: var(--gap);
}

/* The question sets the scale contrast for the whole page: it is the largest
 * type in the thread, and the answer sits beneath it as the body of a note. */
.ask {
  margin: 0;
  padding-left: clamp(0.9rem, 0.5rem + 1vw, 1.5rem);
  border-left: 3px solid var(--signal);
  font: 400 var(--step-1)/1.35 var(--serif);
  letter-spacing: -0.01em;
  max-width: 44ch;
}

.reply {
  padding: clamp(1.1rem, 0.7rem + 1.6vw, 2.25rem);
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  border-radius: 2px;
  box-shadow: 0 1px 0 var(--rule), 0 14px 32px -30px oklch(0% 0 0 / 0.55);
}

.prose { max-width: var(--measure); }
.prose p {
  margin: 0 0 1em;
  font-family: var(--serif);
  font-size: var(--step-0);
  line-height: 1.68;
  white-space: pre-wrap;
}
.prose p:last-child { margin-bottom: 0; }

.tag {
  display: inline-block;
  margin: 0 0 var(--gap-tight);
  padding: 0.3em 0.7em;
  font: 600 var(--step--1)/1.3 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 2px;
}
.tag-nv { color: var(--warn); background: var(--warn-wash); }
.tag-ar { color: var(--alarm); background: var(--alarm-wash); }

.refusals {
  margin-top: var(--gap);
  font-size: var(--step--1);
  color: var(--ink-soft);
}
.refusals summary {
  cursor: pointer;
  font-family: var(--mono);
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  transition: color var(--fast) var(--ease);
}
.refusals summary:hover { color: var(--ink); }
.refusals ul { margin: var(--gap-tight) 0 0; padding-left: 1.2rem; }

.evidence {
  margin-top: var(--gap);
  padding-top: var(--gap-tight);
  border-top: 1px dashed var(--rule-strong);
}
.evidence-label {
  margin: 0 0 var(--gap-hair);
  font: var(--step--1)/1.4 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.evidence ul { margin: 0; padding: 0; list-style: none; }
.evidence li { padding: 0.15rem 0; }
.evidence code {
  color: var(--ink-soft);
  word-break: break-all;
}
.evidence-empty .evidence-label { color: var(--warn); }

/* --------------------------------------------------------------- composer */

.composer {
  margin-top: var(--gap-wide);
  padding: var(--gap);
  background: var(--paper-sunk);
  border: 1px solid var(--rule);
  border-top: 2px solid var(--rule-strong);
  border-radius: 2px;
}
.composer-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  flex-wrap: wrap;
  margin-top: var(--gap-tight);
}
.meta { margin: 0; font-size: var(--step--1); color: var(--ink-faint); }

.scope {
  margin-top: var(--gap-wide);
  padding-top: var(--gap);
  border-top: 1px solid var(--rule);
  font-size: var(--step--1);
  color: var(--ink-soft);
}
.scope summary {
  cursor: pointer;
  font-family: var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  transition: color var(--fast) var(--ease);
}
.scope summary:hover { color: var(--ink); }
.scope p { max-width: var(--measure); }
.scope ul {
  margin: var(--gap-tight) 0 0;
  padding: 0;
  list-style: none;
  columns: 22rem;
  column-gap: var(--gap);
}
.scope li { padding: 0.1rem 0; break-inside: avoid; }

@media (max-width: 40rem) {
  .composer { position: sticky; bottom: 0; box-shadow: 0 -12px 24px -20px oklch(0% 0 0 / 0.6); }
  .masthead { align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}