/* Adaptive survey — participant + admin pages.
 *
 * Light-first: this is a text-heavy research instrument and light backgrounds
 * read better for sustained reading (NN/g). A dark theme exists behind an
 * explicit toggle only. Chat layout follows the conventions students already
 * know: interviewer on the left in white, the participant on the right in the
 * ASCEND blue, a typing indicator, and the composer anchored at the bottom.
 * No external requests: the one web font is served from this origin. */

@font-face {
  font-family: 'Plus Jakarta Sans';
  src: url('fonts/PlusJakartaSans-Variable.woff2') format('woff2');
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #f4f6fa;
  --card: #ffffff;
  --card-muted: #f8fafc;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --muted: #5b6b80;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eaf0fe;
  --primary-ring: rgb(37 99 235 / 0.22);
  --on-primary: #ffffff;
  --danger: #dc2626;
  --danger-soft: #fdecec;
  --success: #15803d;
  --accent: #d97706;
  --accent-soft: #fdf3e2;
  --shadow-sm: 0 1px 2px rgb(15 23 42 / 0.06);
  --shadow-md: 0 6px 24px -8px rgb(15 23 42 / 0.12);
  --font-ui: 'Plus Jakarta Sans', ui-sans-serif, system-ui, sans-serif;
  --font-body: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, 'JetBrains Mono', 'Cascadia Code', 'Fira Code', monospace;
  --radius: 0.75rem;
  --radius-lg: 1.1rem;
  --top-h: 3.75rem;
  color-scheme: light;
}
[data-theme='dark'] {
  --bg: #0b1220;
  --card: #151f31;
  --card-muted: #111a2b;
  --border: #253247;
  --border-strong: #34445c;
  --text: #eef2f7;
  --muted: #9aa8bb;
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-soft: #172a4a;
  --primary-ring: rgb(96 165 250 / 0.35);
  --danger: #f87171;
  --danger-soft: #3a1a1f;
  --success: #4ade80;
  --accent: #fbbf24;
  --accent-soft: #3a2c10;
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.4);
  --shadow-md: 0 8px 28px -10px rgb(0 0 0 / 0.6);
  color-scheme: dark;
}

/* ── base ── */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100dvh;
}
h1, h2, h3 { font-family: var(--font-ui); font-weight: 700; line-height: 1.2; margin: 0 0 0.6rem; letter-spacing: -0.01em; }
h1 { font-size: 1.65rem; }
h2 { font-size: 1.2rem; }
h3 { font-size: 1rem; }
p { margin: 0 0 1rem; }
a { color: var(--primary); text-underline-offset: 2px; }
code { font-family: var(--font-mono); font-size: 0.85em; background: var(--card-muted); border: 1px solid var(--border); padding: 0.05em 0.35em; border-radius: 0.3rem; }
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }
.eyebrow { font-family: var(--font-ui); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--primary); margin: 0 0 0.4rem; }
.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; }
.skip-link { position: absolute; left: -999px; top: 0.5rem; background: var(--card); padding: 0.5rem 0.75rem; border-radius: 0.5rem; z-index: 10; }
.skip-link:focus { left: 0.5rem; }
:focus-visible { outline: 3px solid var(--primary-ring); outline-offset: 2px; border-radius: 0.4rem; }
@media (pointer: coarse) { .btn, .iconbtn, .linkbtn { min-height: 44px; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* ── header ── */
.top { position: sticky; top: 0; z-index: 5; height: var(--top-h); background: color-mix(in srgb, var(--card) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.top__inner { max-width: 46rem; margin-inline: auto; height: 100%; padding: 0 1.25rem; display: flex; align-items: center; gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; font-family: var(--font-ui); font-weight: 800; letter-spacing: -0.01em; color: var(--text); text-decoration: none; white-space: nowrap; }
.brand__mark { width: 0.7rem; height: 0.7rem; border-radius: 0.2rem; background: linear-gradient(135deg, var(--primary), #7c3aed); transform: rotate(45deg); }
.brand__sub { font-weight: 500; color: var(--muted); }
.top__nav { margin-left: auto; display: flex; align-items: center; gap: 1rem; font-size: 0.9rem; font-family: var(--font-ui); }
.top__nav a { color: var(--muted); text-decoration: none; }
.top__nav a:hover { color: var(--text); }
.top__nav form { margin: 0; }
.linkbtn { background: none; border: 0; padding: 0; font: inherit; font-family: var(--font-ui); color: var(--muted); cursor: pointer; }
.linkbtn:hover { color: var(--text); }
.iconbtn { display: inline-grid; place-items: center; width: 2.25rem; height: 2.25rem; border-radius: 999px; border: 1px solid var(--border); background: var(--card); color: var(--muted); cursor: pointer; }
.iconbtn:hover { color: var(--text); border-color: var(--border-strong); }
.iconbtn svg { width: 1.05rem; height: 1.05rem; }
.iconbtn .ico-moon { display: block; }
.iconbtn .ico-sun { display: none; }
[data-theme='dark'] .iconbtn .ico-moon { display: none; }
[data-theme='dark'] .iconbtn .ico-sun { display: block; }
[data-topnav][hidden] + .iconbtn { margin-left: auto; }

/* ── page + cards ── */
.page { max-width: 46rem; margin-inline: auto; padding: 1.5rem 1.25rem 3rem; }
.page--narrow { max-width: 34rem; }
.page--wide { max-width: 72rem; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.5rem 1.75rem; box-shadow: var(--shadow-sm); margin-bottom: 1.25rem; }
.card--hero { padding: 2rem 2rem 1.75rem; }
.center { text-align: center; }

/* ── buttons & forms ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.45rem;
  padding: 0.6rem 1.15rem; font: 600 0.95rem/1.2 var(--font-ui);
  border: 1px solid var(--border-strong); border-radius: 999px;
  background: var(--card); color: var(--text); text-decoration: none; cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s, box-shadow 0.15s;
}
.btn:hover { border-color: var(--primary); }
.btn:disabled, .btn[aria-disabled='true'] { opacity: 0.5; cursor: default; }
.btn--primary { background: var(--primary); border-color: var(--primary); color: var(--on-primary); box-shadow: 0 1px 2px rgb(37 99 235 / 0.35); }
.btn--primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn--lg { padding: 0.8rem 1.5rem; font-size: 1.05rem; }
.btn--ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn--ghost:hover { background: var(--card); border-color: var(--border-strong); }
.btn--quiet { background: transparent; border-color: transparent; color: var(--muted); }

/* Guest invite link: wide enough to read, selectable in one click. */
.invite__url { flex: 1 1 26rem; min-width: 0; font-family: var(--font-mono); font-size: 0.78rem; padding: 0.4rem 0.5rem; border: 1px solid var(--border); border-radius: 0.4rem; background: var(--card-muted); color: var(--text); }
.btn--quiet:hover { color: var(--danger); background: var(--danger-soft); border-color: transparent; }
.btn--danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 45%, var(--border)); }
.btn--danger:hover { background: var(--danger-soft); border-color: var(--danger); }
.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; margin-top: 1rem; }
.field { display: flex; flex-direction: column; gap: 0.3rem; margin: 0.5rem 0; }
.field > span { font: 600 0.75rem var(--font-ui); letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); }
input[type='text'], input[type='date'], textarea, select {
  width: 100%; padding: 0.6rem 0.8rem; font: inherit; font-size: 0.95rem;
  border: 1px solid var(--border-strong); border-radius: var(--radius);
  background: var(--card); color: var(--text);
}
input:focus-visible, textarea:focus-visible, select:focus-visible { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-ring); }
select { width: auto; }
textarea { resize: vertical; }
.check { display: flex; gap: 0.6rem; align-items: flex-start; margin: 0.75rem 0; }
.check input { margin-top: 0.3rem; flex-shrink: 0; width: 1.1rem; height: 1.1rem; accent-color: var(--primary); }
.error { color: var(--danger); font-weight: 600; margin: 0 0 1rem; padding: 0.7rem 1rem; background: var(--danger-soft); border-radius: var(--radius); }
.notice { color: var(--success); font-weight: 600; margin: 0 0 1rem; }
.banner { padding: 0.55rem 0.9rem; border-radius: var(--radius); font: 600 0.85rem var(--font-ui); margin-bottom: 1rem; }
.banner--preview { background: var(--accent-soft); color: var(--accent); border: 1px dashed var(--accent); }
.hint { font-size: 0.8rem; color: var(--muted); }

/* ── consent ── */
.consent .sheet-box { max-height: 55vh; overflow: auto; padding: 1.25rem 1.5rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--card-muted); }
.consent .sheet-box:focus-visible { outline-offset: -3px; }
.consent__roster { color: var(--danger); font-weight: 600; }
.choice { display: flex; gap: 0.8rem; align-items: flex-start; padding: 0.9rem 1rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--card); cursor: pointer; margin: 0.6rem 0; transition: border-color 0.15s, background-color 0.15s; }
.choice:hover { border-color: var(--border-strong); }
.choice:has(input:checked) { border-color: var(--primary); background: var(--primary-soft); }
.choice input { margin-top: 0.25rem; width: 1.15rem; height: 1.15rem; flex-shrink: 0; accent-color: var(--primary); }
.choice-group { border: 0; padding: 0; margin: 0; }
.ferpa__fields { display: grid; grid-template-columns: 2fr 1fr; gap: 0.75rem; padding: 0 0.25rem 0.25rem 2.9rem; }
@media (max-width: 40rem) { .ferpa__fields { grid-template-columns: 1fr; padding-left: 0; } }

/* ── prose (information sheet) ── */
.prose { line-height: 1.7; }
.prose h1 { font-size: 1.5rem; margin-top: 0; }
.prose h2 { font-size: 1.1rem; margin-top: 1.5rem; }
.prose ul, .prose ol { padding-left: 1.4rem; }
.prose li { margin-bottom: 0.35rem; }
.sheet .sheet__nav { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.sheet__version { color: var(--muted); font: 0.75rem var(--font-mono); margin-top: 2rem; }
@media print {
  .no-print, .top { display: none !important; }
  body { background: #fff; color: #000; }
  .page { max-width: none; padding: 0; }
}

/* ── ready / done ── */
.opening { font-size: 1.05rem; line-height: 1.65; padding: 1rem 1.25rem; border-left: 4px solid var(--primary); background: var(--primary-soft); border-radius: 0 var(--radius) var(--radius) 0; color: var(--text); }
.done__icon { width: 3.25rem; height: 3.25rem; border-radius: 999px; display: grid; place-items: center; background: color-mix(in srgb, var(--success) 15%, transparent); color: var(--success); margin: 0 auto 1rem; }
.done__icon svg { width: 1.6rem; height: 1.6rem; }

/* ── chat ── */
.chat { display: flex; flex-direction: column; height: calc(100dvh - var(--top-h) - 2.75rem); min-height: 30rem; }
.chat__head { display: flex; flex-direction: column; gap: 0.6rem; padding: 0 0.25rem 0.9rem; }
.chat__row { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.chat__title { margin: 0; font: 600 0.9rem var(--font-ui); color: var(--muted); }
.chat__progress { margin: 0; font: 700 0.85rem var(--font-ui); color: var(--text); }
.chat__progress small { font-weight: 500; color: var(--muted); }
.segments { display: flex; gap: 0.35rem; list-style: none; padding: 0; margin: 0; }
.segments li { flex: 1; height: 0.3rem; border-radius: 999px; background: var(--border); transition: background-color 0.3s; }
.segments li.is-done { background: color-mix(in srgb, var(--primary) 55%, var(--border)); }
.segments li.is-current { background: var(--primary); }

.chat__scroll { flex: 1; min-height: 0; overflow-y: auto; padding: 0.5rem 0.25rem 1rem; scroll-behavior: smooth; display: flex; flex-direction: column; }
.msg { display: flex; flex-direction: column; max-width: 86%; margin: 0 0 0.9rem; }
.msg--q { align-self: flex-start; align-items: flex-start; }
.msg--you { align-self: flex-end; align-items: flex-end; }
.msg__cap { font: 700 0.66rem/1 var(--font-ui); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin: 0 0 0.35rem 0.3rem; }
.msg--you .msg__cap { margin: 0 0.3rem 0.35rem 0; }
.msg__bubble {
  padding: 0.8rem 1.05rem; border-radius: var(--radius-lg); line-height: 1.55;
  white-space: pre-wrap; overflow-wrap: anywhere; box-shadow: var(--shadow-sm);
}
.msg--q .msg__bubble { background: var(--card); border: 1px solid var(--border); border-bottom-left-radius: 0.35rem; }
.msg--starter .msg__bubble { font-weight: 500; font-size: 1.05rem; border-color: color-mix(in srgb, var(--primary) 35%, var(--border)); }
.msg--opening .msg__bubble { background: var(--card-muted); color: var(--muted); font-size: 0.95rem; border-style: dashed; box-shadow: none; }
.msg--you .msg__bubble { background: var(--primary); color: var(--on-primary); border-bottom-right-radius: 0.35rem; }
.msg--pending .msg__bubble { opacity: 0.75; }
.typing { display: inline-flex; gap: 0.32rem; align-items: center; padding: 0.95rem 1.05rem; }
.typing i { width: 0.5rem; height: 0.5rem; border-radius: 50%; background: var(--muted); animation: bob 1.25s ease-in-out infinite; }
.typing i:nth-child(2) { animation-delay: 0.18s; }
.typing i:nth-child(3) { animation-delay: 0.36s; }
@keyframes bob { 0%, 60%, 100% { transform: translateY(0); opacity: 0.4; } 30% { transform: translateY(-4px); opacity: 1; } }

.composer { position: sticky; bottom: 0; padding: 0.75rem 0 0.25rem; background: linear-gradient(to bottom, transparent, var(--bg) 35%); }
.composer__box {
  display: flex; align-items: flex-end; gap: 0.5rem;
  background: var(--card); border: 1px solid var(--border-strong); border-radius: 1.35rem;
  padding: 0.45rem 0.45rem 0.45rem 1.05rem; box-shadow: var(--shadow-md);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.composer__box:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-ring), var(--shadow-md); }
.composer__box textarea { flex: 1; border: 0; background: transparent; resize: none; padding: 0.5rem 0; font: inherit; font-size: 1rem; line-height: 1.5; max-height: 12rem; color: var(--text); }
.composer__box textarea:focus-visible { outline: none; box-shadow: none; }
.composer__box textarea::placeholder { color: var(--muted); }
.composer__send { padding: 0.6rem 1.05rem; }
.composer__row { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.6rem; flex-wrap: wrap; }
.composer__spacer { flex: 1; }

.modal { border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.5rem 1.75rem; max-width: 26rem; background: var(--card); color: var(--text); box-shadow: var(--shadow-md); }
.modal::backdrop { background: rgb(15 23 42 / 0.45); backdrop-filter: blur(2px); }
.modal .actions { justify-content: flex-end; }

/* ── admin ── */
.admin-survey__head h2 code { font-size: 0.7em; margin-left: 0.5rem; }
.table { width: 100%; border-collapse: collapse; font-size: 0.9rem; margin: 0.75rem 0; }
.table th, .table td { text-align: left; padding: 0.45rem 0.6rem; border-bottom: 1px solid var(--border); }
.table th { font: 700 0.7rem var(--font-ui); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.keyholder { margin-top: 1rem; border-top: 1px dashed var(--border); padding-top: 0.75rem; }
.keyholder summary { cursor: pointer; font: 600 0.95rem var(--font-ui); }
.danger-zone { margin-top: 1.25rem; padding: 0.9rem 1.1rem; border: 1px solid color-mix(in srgb, var(--danger) 40%, var(--border)); border-radius: var(--radius); background: color-mix(in srgb, var(--danger-soft) 60%, transparent); }
.danger-zone input { max-width: 16rem; }

/* ── model-connectivity light ── */
.status {
  display: inline-flex; align-items: center; gap: 0.45rem; max-width: 16rem;
  padding: 0.3rem 0.7rem; border-radius: 999px; border: 1px solid var(--border); background: var(--card);
  font: 600 0.74rem var(--font-ui); color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.status__label { overflow: hidden; text-overflow: ellipsis; }
.status__dot { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--muted); flex-shrink: 0; }
.status.is-ok .status__dot { background: var(--success); box-shadow: 0 0 0 3px color-mix(in srgb, var(--success) 18%, transparent); }
.status.is-degraded .status__dot, .status.is-mock .status__dot { background: var(--accent); }
.status.is-down { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); }
.status.is-down .status__dot { background: var(--danger); }
.status.is-unknown .status__dot { animation: pulse 1.5s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 0.35; } 50% { opacity: 1; } }
.llm-note { margin: 0 0 0.75rem; padding: 0.6rem 0.9rem; border-radius: var(--radius); background: var(--danger-soft); color: var(--danger); font-size: 0.9rem; font-weight: 600; }

/* ── admin: sessions + transcript viewer ── */
.sessions { margin-top: 1.25rem; border-top: 1px solid var(--border); padding-top: 1rem; }
.sessions__head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.75rem; margin-bottom: 0.5rem; }
.sessions__head h3 { margin: 0; }
.filters { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; }
.filters .check { margin: 0; }
.table-wrap { overflow-x: auto; }
.table--click tbody tr { cursor: pointer; }
.table--click tbody tr:hover { background: var(--primary-soft); }
.table td.mono { font-family: var(--font-mono); font-size: 0.8rem; }
.pager { display: flex; gap: 0.6rem; align-items: center; justify-content: flex-end; margin-top: 0.5rem; }
.modal--wide { max-width: 46rem; width: min(92vw, 46rem); padding: 1.25rem 1.5rem; }
.modal__head { display: flex; justify-content: space-between; gap: 1rem; align-items: flex-start; flex-wrap: wrap; margin-bottom: 0.75rem; }
.modal__head h2 { margin: 0 0 0.25rem; }
.modal__tools { display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap; }
.transcript { max-height: 62vh; overflow: auto; display: flex; flex-direction: column; padding: 0.25rem 0.25rem 0.5rem; }
.msg__meta { font: 0.7rem/1.4 var(--font-mono); color: var(--muted); margin: 0.3rem 0.3rem 0; max-width: 100%; overflow-wrap: anywhere; }
.divider { align-self: center; font: 600 0.66rem var(--font-ui); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 0.1rem 0 0.9rem; padding: 0.2rem 0.7rem; border-radius: 999px; background: var(--card-muted); border: 1px dashed var(--border); }
.divider--error { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); }
.tag { display: inline-block; font: 600 0.68rem var(--font-ui); letter-spacing: 0.04em; padding: 0.1rem 0.5rem; border-radius: 999px; background: var(--card-muted); border: 1px solid var(--border); color: var(--muted); }
.tag--completed { color: var(--success); }
.tag--stopped, .tag--expired { color: var(--accent); }
.tag--active { color: var(--primary); }