/* TRACE Explorer — design system */

:root {
  color-scheme: light;
  --surface: #ffffff;
  --surface-2: #f4f6f9;
  --surface-3: #eaeef4;
  --border: #dde3ea;
  --text: #17202b;
  --text-2: #4a5563;
  --muted: #6b7684;
  --accent: #2e5e8c;
  --accent-ink: #ffffff;
  --accent-soft: #e6eef7;
  /* constructs: validated colour-blind-safe set */
  --trust: #2a78d6;
  --competence: #eb6834;
  --concerns: #1baf7a;
  --concerns-soft: #a7dcc7;
  --danger: #b42318;
  --radius: 14px;
  --shadow: 0 1px 2px rgb(16 24 40 / 5%), 0 2px 10px rgb(16 24 40 / 4%);
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --surface: #0f1720; --surface-2: #16202b; --surface-3: #1d2936; --border: #2a3644;
    --text: #e8eef5; --text-2: #b5c0cc; --muted: #8b97a5;
    --accent: #8cb8e6; --accent-ink: #0f1720; --accent-soft: #1b2a3a;
    --trust: #3987e5; --competence: #d95926; --concerns: #199e70; --concerns-soft: #1d5a45;
    --danger: #f97066; --shadow: none;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --surface: #0f1720; --surface-2: #16202b; --surface-3: #1d2936; --border: #2a3644;
  --text: #e8eef5; --text-2: #b5c0cc; --muted: #8b97a5;
  --accent: #8cb8e6; --accent-ink: #0f1720; --accent-soft: #1b2a3a;
  --trust: #3987e5; --competence: #d95926; --concerns: #199e70; --concerns-soft: #1d5a45;
  --danger: #f97066; --shadow: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; background: var(--surface); color: var(--text); font: 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
h1, h2, h3 { font-family: var(--serif); line-height: 1.2; margin: 0 0 .5rem; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.9rem, 4.2vw, 2.9rem); max-width: 24ch; }
h2 { font-size: clamp(1.3rem, 2.6vw, 1.7rem); }
h3 { font-size: 1.08rem; }
a { color: var(--accent); }
code { font-family: var(--mono); font-size: .88em; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
[hidden] { display: none !important; }

.wrap { width: min(1220px, 100% - 32px); margin-inline: auto; }
.skip-link { position: absolute; left: -999px; }
.skip-link:focus { left: 16px; top: 16px; background: var(--surface); padding: 8px; z-index: 20; }

/* ---------- header ---------- */
.site-header { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.header-row { display: flex; align-items: center; gap: 1.25rem; min-height: 62px; }
.brand { display: flex; align-items: center; gap: .55rem; color: var(--text); text-decoration: none; font-size: 1.08rem; white-space: nowrap; }
.brand-mark { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 8px; background: linear-gradient(135deg, var(--trust), var(--competence)); color: #fff; font-weight: 700; }
.mode-tabs { display: flex; gap: .25rem; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.mode-tabs a { color: var(--text-2); text-decoration: none; font-size: .93rem; font-weight: 550; padding: .45rem .8rem; border-radius: 8px; white-space: nowrap; }
.mode-tabs a:hover { background: var(--surface-2); color: var(--text); }
.mode-tabs a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); }
.theme-toggle { border: 1px solid var(--border); background: var(--surface-2); color: var(--text); border-radius: 8px; width: 36px; height: 36px; cursor: pointer; flex: none; }

/* ---------- type helpers ---------- */
.eyebrow, .kicker { text-transform: uppercase; letter-spacing: .08em; font-size: .76rem; color: var(--muted); margin: 0 0 .45rem; font-weight: 650; }
.lede { font-size: 1.1rem; color: var(--text-2); max-width: 46rem; }
.context { color: var(--muted); font-size: .88rem; margin: .25rem 0 0; }
.note { font-size: .86rem; color: var(--muted); margin: .5rem 0 0; }
.small { font-size: .85rem; color: var(--muted); }
.tag-trust, .c-trust { color: var(--trust); font-weight: 650; }
.tag-competence, .c-competence { color: var(--competence); font-weight: 650; }
.tag-concerns, .c-concerns { color: var(--concerns); font-weight: 650; }
.pill { display: inline-block; font-family: var(--sans); font-size: .75rem; font-weight: 650; padding: .1rem .55rem; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); color: var(--text-2); vertical-align: middle; }

/* ---------- buttons & controls ---------- */
.btn { display: inline-flex; align-items: center; gap: .45rem; font: inherit; font-size: .92rem; font-weight: 600; padding: .55rem 1rem; border-radius: 10px; border: 1px solid transparent; cursor: pointer; text-decoration: none; line-height: 1.2; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-primary:disabled { opacity: .6; cursor: wait; }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: var(--surface-2); }
.btn-ghost { background: transparent; color: var(--text-2); }
.btn-ghost:hover { background: var(--surface-2); }
.btn-block { width: 100%; justify-content: center; }
.segmented { display: inline-flex; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--surface); flex: none; }
.segmented button { border: 0; background: transparent; color: var(--text-2); padding: .45rem .95rem; font: inherit; font-size: .9rem; cursor: pointer; }
.segmented button + button { border-left: 1px solid var(--border); }
.segmented button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
select, input[type="text"], input[type="password"], textarea {
  font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: .55rem .75rem; width: 100%; }
textarea { font-family: var(--mono); font-size: .86rem; line-height: 1.5; resize: vertical; }
.field { display: flex; flex-direction: column; gap: .35rem; font-size: .9rem; font-weight: 600; color: var(--text-2); margin-bottom: .9rem; }
.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.chip { border: 1px solid var(--border); background: var(--surface); color: var(--text-2); border-radius: 999px; padding: .35rem .85rem; font: inherit; font-size: .86rem; cursor: pointer; }
.chip:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- cards & KPIs ---------- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem 1.4rem; box-shadow: var(--shadow); min-width: 0; }
.kpis { display: grid; gap: .9rem; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); margin: 1.25rem 0; }
.kpi { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: .9rem 1.1rem .8rem 1.3rem; overflow: hidden; }
.kpi::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 5px; background: var(--kpi-color); }
.kpi-label { font-size: .82rem; color: var(--text-2); font-weight: 650; }
.kpi-values { display: flex; align-items: baseline; gap: .5rem; margin: .1rem 0; }
.kpi-before { font-size: 1.1rem; color: var(--muted); }
.kpi-arrow { color: var(--muted); }
.kpi-after { font-size: 1.75rem; font-weight: 700; font-family: var(--serif); }
.kpi-meta { font-size: .78rem; color: var(--muted); }
.kpis-compact { grid-template-columns: 1fr; gap: .6rem; margin: 0; }
.kpis-compact .kpi { padding: .65rem 1rem .6rem 1.2rem; }
.kpis-compact .kpi-after { font-size: 1.45rem; }

/* ---------- explore ---------- */
.intro { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(260px, 1fr); gap: 2rem; align-items: end; padding: 2.4rem 0 1.6rem; }
.explore { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 1.5rem; align-items: start; }
.questions { position: sticky; top: 78px; max-height: calc(100vh - 92px); overflow-y: auto; padding-right: .25rem; }
.q-group { margin-bottom: 1rem; }
.q-group h3 { font-family: var(--sans); font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 0 0 .4rem; }
.q-card { display: block; width: 100%; text-align: left; font: inherit; font-size: .9rem; line-height: 1.4; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-left: 3px solid transparent; border-radius: 10px; padding: .6rem .8rem; margin-bottom: .4rem; cursor: pointer; transition: background .15s, border-color .15s; }
.q-card:hover { background: var(--surface-2); }
.q-card[aria-pressed="true"] { border-color: var(--accent); border-left-color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.q-custom { border-style: dashed; color: var(--accent); }
.stage { padding: 1.5rem 1.6rem; }
.stage-head { display: flex; justify-content: space-between; gap: 1rem; align-items: start; flex-wrap: wrap; }
.stage-head h2 { max-width: 34ch; }
.answer { font-size: 1.04rem; color: var(--text-2); background: var(--surface-2); border-radius: 10px; padding: .8rem 1rem; margin: .5rem 0 1rem; border-left: 4px solid var(--accent); }
.builder { display: flex; flex-wrap: wrap; gap: 1rem; margin: .25rem 0 .5rem; }
.builder label { display: flex; flex-direction: column; gap: .25rem; font-size: .82rem; font-weight: 650; color: var(--text-2); min-width: 220px; }
.chart { width: 100%; min-height: 120px; }
.stage-actions { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.fade-in { animation: fade .35s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .fade-in { animation: none; } html { scroll-behavior: auto; } }

.how-band { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; margin-top: 2rem; margin-bottom: 1rem; background: var(--surface-2); box-shadow: none; }
.how-band p { margin: .25rem 0 0; font-size: .88rem; color: var(--text-2); }
.step { display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font-size: .8rem; font-weight: 700; margin-right: .45rem; }

/* ---------- tables ---------- */
.table-view { margin-top: .9rem; }
.table-view summary { cursor: pointer; color: var(--accent); font-weight: 600; font-size: .9rem; }
.table-view > div { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .88rem; margin-top: .6rem; }
th, td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--text-2); font-weight: 600; background: var(--surface-2); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ---------- findings article ---------- */
.article { max-width: 860px; padding: 2.4rem 0 1rem; }
.article h1 { max-width: none; }
.article h2 { margin-top: 2.4rem; }
.article > p { color: var(--text-2); }
.article .card { margin-top: .75rem; }
.grid-3 { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.grid-3 .card p { color: var(--text-2); margin: 0; font-size: .94rem; }
.grid-2 { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); margin-top: 1rem; }
.prose p, .prose li { color: var(--text-2); }
.downloads a { white-space: nowrap; }

/* ---------- prompt lab ---------- */
.lab { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 1.25rem; margin-top: 1.25rem; align-items: start; }
.lab-side { display: flex; flex-direction: column; gap: .6rem; }
.lab-item { display: flex; flex-direction: column; text-align: left; font: inherit; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: .6rem .8rem; cursor: pointer; color: var(--text); }
.lab-item.active { border-color: var(--accent); background: var(--accent-soft); }
.lab-item-title { font-size: .9rem; font-weight: 600; }
.lab-item-meta { font-size: .78rem; color: var(--muted); }
.lab-prompts { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.lab-tools { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; margin-bottom: 1rem; }
.lab-bottom { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(220px, 1fr); gap: 1rem; }
.checklist { background: var(--surface-2); border-radius: 10px; padding: .8rem 1rem; }
.checklist h3 { font-family: var(--sans); font-size: .92rem; }
.checklist ul { list-style: none; padding: 0; margin: 0; font-size: .88rem; color: var(--muted); }
.checklist li { padding: .2rem 0; }
.checklist li.ok { color: var(--text); }
.checklist li.ok span { color: var(--concerns); font-weight: 700; }

/* ---------- ask ---------- */
.ask { max-width: 900px; padding-top: 2.4rem; }
.steps { padding-left: 1.2rem; color: var(--text-2); }
.steps li { margin-bottom: .45rem; }
.key-form { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; margin: 1rem 0 .5rem; }
.key-form input[type="password"] { flex: 1 1 280px; }
.check { display: inline-flex; gap: .4rem; align-items: center; font-size: .88rem; color: var(--text-2); }
.chat { display: flex; flex-direction: column; gap: 1rem; margin-top: 1.25rem; }
.chat-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.chat-log { display: flex; flex-direction: column; gap: .9rem; max-height: 58vh; overflow-y: auto; }
.chat-log:empty { display: none; }
.msg { max-width: 88%; border-radius: 14px; padding: .7rem 1rem; }
.msg-user { align-self: flex-end; background: var(--accent); color: var(--accent-ink); }
.msg-model { align-self: flex-start; background: var(--surface-2); }
.msg-who { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; opacity: .75; margin-bottom: .2rem; }
.msg-body p { margin: .3rem 0; }
.msg-body ul { margin: .3rem 0; padding-left: 1.2rem; }
.msg-body .error { color: var(--danger); }
.typing { color: var(--muted); font-style: italic; }
.prompt-block { white-space: pre-wrap; font-family: var(--mono); font-size: .82rem; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: .6rem .8rem; }
.chat-form { display: flex; gap: .6rem; }

/* ---------- dialog ---------- */
dialog { width: min(760px, 100% - 24px); max-height: calc(100vh - 32px); border: 1px solid var(--border); border-radius: 16px; padding: 1.4rem 1.5rem; background: var(--surface); color: var(--text); box-shadow: 0 24px 64px rgb(0 0 0 / 25%); }
dialog::backdrop { background: rgb(15 23 32 / 55%); backdrop-filter: blur(2px); }
.dialog-head { display: flex; justify-content: space-between; gap: 1rem; align-items: start; }
.file-buttons { display: inline-flex; flex-wrap: wrap; gap: .4rem; margin-top: .35rem; }
.file-buttons .btn { font-size: .84rem; padding: .35rem .7rem; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border); margin-top: 3rem; padding: 1.5rem 0 2.5rem; color: var(--text-2); }
.footer-row { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer-row p { margin: .2rem 0; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .intro { grid-template-columns: 1fr; gap: 1rem; }
  .kpis-compact { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
  .how-band { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .explore, .lab { grid-template-columns: 1fr; }
  .questions { position: static; max-height: none; }
  .lab-prompts, .lab-bottom { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .brand-text { display: none; }
  .header-row { gap: .5rem; }
  .mode-tabs a { padding: .4rem .55rem; font-size: .86rem; }
  .how-band { grid-template-columns: 1fr; }
  .card, .stage { padding: 1rem; }
  .msg { max-width: 100%; }
}
@media print {
  .site-header, .theme-toggle, .segmented, .stage-actions, .questions { display: none; }
}

/* ---------- refinements ---------- */
.intro { grid-template-columns: 1fr; gap: 1.25rem; align-items: start; padding-bottom: 1.4rem; }
.intro-text h1 { max-width: none; }
.kpis-compact { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 760px) { .kpis-compact { grid-template-columns: 1fr; } }
.view[data-view="lab"] > .wrap, .view[data-view="about"] > .wrap { padding-top: 2.4rem; }
#vibe-prompt, .lab textarea { font-family: var(--sans); font-size: .93rem; line-height: 1.55; }

/* ---------- Ask TRACE: chat app layout ---------- */
.ask-page { padding-top: 2.2rem; }
.page-head { margin-bottom: 1.25rem; }
.ask-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 1.25rem; align-items: start; }
.chat { display: flex; flex-direction: column; gap: .75rem; padding: 0; overflow: hidden; height: min(72vh, 760px); min-height: 520px; margin: 0; }
.chat.dragging { outline: 3px dashed var(--accent); outline-offset: -6px; }
.chat-head { display: flex; justify-content: space-between; align-items: center; padding: .8rem 1.1rem; border-bottom: 1px solid var(--border); background: var(--surface-2); }
.chat-status { display: inline-flex; align-items: center; gap: .45rem; font-size: .86rem; font-weight: 600; color: var(--text-2); }
.status-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.status-dot.ok { background: var(--concerns); box-shadow: 0 0 0 3px color-mix(in srgb, var(--concerns) 25%, transparent); }
.chat-log { flex: 1; overflow-y: auto; max-height: none; padding: .5rem 1.1rem; display: flex; flex-direction: column; gap: .9rem; }
.chat-log:empty { display: flex; }
.chat .chips { padding: 0 1.1rem; }
.composer { border-top: 1px solid var(--border); padding: .75rem 1.1rem .8rem; background: var(--surface); }
.composer-row { display: flex; align-items: flex-end; gap: .5rem; }
.composer-row textarea { font-family: var(--sans); font-size: .98rem; resize: none; min-height: 44px; max-height: 180px; line-height: 1.45; padding: .6rem .8rem; }
.icon-btn { font-size: 1.15rem; padding: .5rem .6rem; }
.btn-small { font-size: .84rem; padding: .35rem .7rem; }
.composer-note { margin-top: .45rem; font-size: .8rem; }
.file-row { display: flex; flex-wrap: wrap; gap: .4rem; }
.file-row:not(:empty) { margin-bottom: .5rem; }
.file-chip { display: inline-flex; align-items: center; gap: .35rem; font-size: .82rem; background: var(--accent-soft); color: var(--text); border-radius: 999px; padding: .2rem .4rem .2rem .7rem; }
.file-chip button { border: 0; background: transparent; color: var(--text-2); cursor: pointer; font-size: 1rem; line-height: 1; padding: 0 .25rem; }
.msg { max-width: 86%; border-radius: 16px; padding: .7rem 1rem; line-height: 1.55; }
.msg-user { border-bottom-right-radius: 4px; }
.msg-model { border-bottom-left-radius: 4px; background: var(--surface-2); }
.msg-body table { font-size: .82rem; background: var(--surface); border-radius: 8px; }
.msg-files { font-size: .82rem; opacity: .85; }
.msg-topic { font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin-bottom: .1rem !important; }
.typing { display: inline-flex; gap: .3rem; padding: .3rem 0; }
.typing span { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); animation: blink 1.2s infinite ease-in-out; }
.typing span:nth-child(2) { animation-delay: .15s; }
.typing span:nth-child(3) { animation-delay: .3s; }
@keyframes blink { 0%, 80%, 100% { opacity: .25; } 40% { opacity: 1; } }
.ask-side { display: flex; flex-direction: column; gap: .9rem; }
.side-card { padding: 1rem 1.1rem; }
.side-card h3 { font-family: var(--sans); font-size: .9rem; margin-bottom: .35rem; }
.side-card p, .plain-list { font-size: .88rem; color: var(--text-2); margin: 0; }
.plain-list { padding-left: 1.05rem; }
.plain-list li { margin-bottom: .3rem; }
.side-warn { border-left: 4px solid var(--competence); }
@media (max-width: 900px) {
  .ask-layout { grid-template-columns: 1fr; }
  .chat { height: 70vh; min-height: 460px; }
}

.ask-side .plain-list li[role="button"] { cursor: pointer; color: var(--accent); }
.ask-side .plain-list li[role="button"]:hover { text-decoration: underline; }

/* ---------- Findings: same page frame as the other views ---------- */
.findings-page { padding-top: 2.2rem; }
.summary-line { font-family: var(--serif); font-size: clamp(1.15rem, 2.2vw, 1.45rem); color: var(--text); margin: .1rem 0 .4rem; }
.findings-page .kpis-compact { margin: 1.25rem 0 1.5rem; }
.finding { display: grid; grid-template-columns: minmax(260px, 2fr) minmax(0, 3fr); gap: 1.75rem; align-items: center; padding: 1.5rem 1.6rem; margin-bottom: 1.25rem; }
.finding-text h2 { font-size: 1.35rem; margin: .5rem 0 .6rem; }
.finding-text p { color: var(--text-2); }
.finding-num { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font-weight: 700; font-size: .85rem; }
.section-title { margin: 2rem 0 .9rem; }
.caution { margin-top: 1rem; }
@media (max-width: 900px) { .finding { grid-template-columns: 1fr; gap: 1rem; } }