/* CDI Expert Assistant, styled to the CDI Design System. Academy content, so Sky is the accent.
   Kept from the guide: Imperial on white and Stone, Roboto Serif with Space Mono labels,
   weight-300 headlines, square corners, no divider lines, no shadows, no gradients.
   This is a working tool, so the app chrome uses the guide's denser profile (section 8.2):
   smaller controls and labels, answers kept at a comfortable reading size. */
:root {
  --cdi-imperial: #010449;
  --cdi-imperial-hover: #1a1e6b;
  --cdi-stone: #EBE9E4;
  --cdi-stone-deep: #E2DFD8;     /* hover on Stone */
  --cdi-sky: #96CCEC;
  --cdi-white: #FFFFFF;
  --cdi-muted: #4a4c72;          /* Imperial at reduced strength: secondary text on light */
  --cdi-faint: #8a8ba6;          /* placeholders, timestamps */
  --cdi-font-display: "Roboto Serif", Georgia, "Times New Roman", serif;
  --cdi-font-mono: "Space Mono", ui-monospace, "Courier New", monospace;
  --cdi-tracking-body: 0.02em;
  --cdi-tracking-mono: 0.12em;
  --space-x: 40px;
  --top-h: 56px;
  --col: 760px;                  /* reading column */
}

/* Dark mode: Imperial becomes the canvas; text, outlines and primary fills turn white (the guide's
   "white or black only on coloured panels"). Sky accents become the guide's warm grey on dark. */
:root[data-theme="dark"] {
  color-scheme: dark;
  --cdi-imperial: #FFFFFF;
  --cdi-imperial-hover: #D9D5CE;
  --cdi-white: #010449;
  --cdi-stone: #0B1059;
  --cdi-stone-deep: #161B6B;
  --cdi-sky: #D9D5CE;
  --cdi-muted: #D9D5CE;
  --cdi-faint: #B7B2A8;
}
:root[data-theme="dark"] .cdi-chip,
:root[data-theme="dark"] .sources li::before { color: #010449; }
:root[data-theme="dark"] .tiles { background: var(--cdi-stone); color: #B7B2A8; }
:root[data-theme="dark"] .tiles .accent { color: #FFFFFF; }
.theme-btn .i-sun { display: none; }
:root[data-theme="dark"] .theme-btn .i-sun { display: block; }
:root[data-theme="dark"] .theme-btn .i-moon { display: none; }

* { box-sizing: border-box; border-radius: 0; }
html, body { height: 100%; }
body {
  transition: background-color 200ms ease, color 200ms ease;
  margin: 0;
  font-family: var(--cdi-font-display);
  font-optical-sizing: auto;
  font-variation-settings: "GRAD" 20;
  font-size: 17px;
  line-height: 1.5;
  letter-spacing: var(--cdi-tracking-body);
  color: var(--cdi-imperial);
  background: var(--cdi-white);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-weight: 300; font-variation-settings: "GRAD" -20; line-height: 1.06; letter-spacing: -0.005em; margin: 0; }
b, strong { font-weight: 500; }
a { color: var(--cdi-imperial); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
.hidden { display: none !important; }
.nowrap { white-space: nowrap; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 2px solid var(--cdi-imperial); outline-offset: 2px; }

.eyebrow {
  display: block; margin: 0 0 12px;
  font-family: var(--cdi-font-mono); font-size: 11px; line-height: 1.3;
  text-transform: uppercase; letter-spacing: var(--cdi-tracking-mono);
}
.dotted-rule { display: block; color: var(--cdi-imperial); margin: 16px 0 20px; }
.lede { font-size: 18px; margin: 0 0 28px; max-width: 36em; }
.cdi-chip {
  display: inline-block; padding: 3px 8px;
  font-family: var(--cdi-font-mono); font-size: 10px; line-height: 1.3;
  text-transform: uppercase; letter-spacing: var(--cdi-tracking-mono);
  background: var(--cdi-sky); color: var(--cdi-imperial);
}

/* Buttons and inputs */
button { font: inherit; letter-spacing: inherit; cursor: pointer; color: inherit; background: none; border: 0; padding: 0; }
button:disabled { opacity: .4; cursor: default; }
.cdi-btn { font-weight: 500; font-size: 15px; line-height: 1.3; padding: 11px 22px; transition: background-color 150ms ease; }
.cdi-btn-primary { background: var(--cdi-imperial); color: var(--cdi-white); }
.cdi-btn-primary:hover { background: var(--cdi-imperial-hover); }
.cdi-btn-secondary { background: var(--cdi-white); color: var(--cdi-imperial); border: 1.5px solid var(--cdi-imperial); padding: 9.5px 20px; }
.cdi-btn-secondary:hover { background: var(--cdi-stone); }
button.link { font-size: 14px; text-decoration: underline; text-underline-offset: 3px; padding: 6px 0; }
.icon-btn { width: 30px; height: 30px; display: inline-flex; align-items: center; justify-content: center; color: var(--cdi-muted); transition: color 150ms ease, background-color 150ms ease; }
.icon-btn:hover { color: var(--cdi-imperial); background: var(--cdi-stone); }
.icon-btn svg { width: 17px; height: 17px; }

input, textarea {
  width: 100%; font: inherit; letter-spacing: inherit; color: var(--cdi-imperial);
  background: var(--cdi-white); border: 1.5px solid var(--cdi-imperial); padding: 11px 14px;
}
input::placeholder, textarea::placeholder { color: var(--cdi-faint); opacity: 1; }
form .eyebrow { margin-bottom: 8px; }
form .cdi-btn { margin-top: 16px; }
form .link { margin-left: 16px; }
.msg { min-height: 1.4em; font-size: 14px; color: var(--cdi-muted); margin: 16px 0 0; }

/* Top bar */
.top { height: var(--top-h); display: flex; justify-content: space-between; align-items: center; padding: 0 24px; background: var(--cdi-white); }
.brand { display: flex; align-items: center; gap: 12px; }
.logo { height: 24px; width: auto; display: block; }
:root[data-theme="dark"] .logo { filter: brightness(0) invert(1); }  /* the mark is Imperial; white on dark */
.product { font-size: 19px; font-weight: 300; font-variation-settings: "GRAD" -20; letter-spacing: 0; }
.top-right { display: flex; align-items: center; gap: 8px; }
.top-new { display: none; }
.who { font-family: var(--cdi-font-mono); font-size: 11px; letter-spacing: 0.04em; color: var(--cdi-muted); display: flex; align-items: center; gap: 16px; }
.who .link { font-family: var(--cdi-font-display); font-size: 13px; letter-spacing: var(--cdi-tracking-body); color: var(--cdi-imperial); }

/* Sign in: Sky tiled-shape frame beside the form */
.signin { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); min-height: calc(100vh - var(--top-h)); }
.tiles { background: var(--cdi-sky); color: var(--cdi-white); display: flex; align-items: center; justify-content: center; padding: 40px; overflow: hidden; }
.tiles svg { width: 100%; max-width: 640px; height: auto; aspect-ratio: 1; display: block; }
.tiles .accent { color: var(--cdi-imperial); }
.signin-body { padding: 112px 56px 40px; max-width: 600px; display: flex; flex-direction: column; }
.signin-body h1, .notice h1 { font-size: clamp(36px, 4vw, 52px); }
.signin-body form { max-width: 400px; }
.copyright { margin-top: auto; padding-top: 80px; font-family: var(--cdi-font-mono); font-size: 11px; letter-spacing: 0.04em; color: var(--cdi-muted); }
.notice { max-width: 720px; padding: 112px 56px; }

/* App layout: Stone sidebar beside a white conversation */
.layout { --side-w: 248px; --pane-w: 380px; position: relative; display: grid; grid-template-columns: var(--side-w) minmax(0, 1fr); grid-template-rows: minmax(0, 1fr); height: calc(100vh - var(--top-h)); }
.side { background: var(--cdi-stone); padding: 16px 12px; overflow-y: auto; }
.new-chat {
  width: 100%; display: flex; align-items: center; gap: 8px; padding: 9px 12px;
  background: var(--cdi-white); font-size: 14px; font-weight: 500; transition: background-color 150ms ease;
}
.new-chat:hover { background: var(--cdi-imperial); color: var(--cdi-white); }
.new-chat svg { width: 16px; height: 16px; flex: none; }
.side-label { margin: 24px 12px 6px; color: var(--cdi-muted); }
#history { list-style: none; padding: 0; margin: 0; }
#history li {
  padding: 6px 12px; cursor: pointer; font-size: 14px; line-height: 1.35;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: background-color 120ms ease;
}
#history li:hover { background: var(--cdi-stone-deep); }
#history li.on { background: var(--cdi-white); }
#history li { display: flex; align-items: center; gap: 4px; }
#history .h-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; }
#history .h-del { flex: none; width: 20px; height: 20px; padding: 2px; color: var(--cdi-muted); opacity: 0; transition: opacity 120ms ease; }
#history .h-del svg { width: 14px; height: 14px; }
#history li:hover .h-del, #history li.on .h-del, #history .h-del:focus-visible { opacity: 1; }
#history .h-del:hover { color: var(--cdi-imperial); }

.chat { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.thread { flex: 1; overflow-y: auto; padding: 32px max(var(--space-x), calc((100% - var(--col)) / 2)) 16px; }

/* Welcome */
.welcome { padding-top: 7vh; max-width: 620px; }
.welcome h1 { font-size: clamp(32px, 3.4vw, 44px); }
.examples { display: flex; flex-direction: column; align-items: flex-start; gap: 2px; }
.examples .eyebrow { margin: 0 0 8px; color: var(--cdi-muted); }
.tour-again { margin-top: 28px; color: var(--cdi-muted); }
.examples button {
  text-align: left; font-size: 15px; color: var(--cdi-muted); padding: 5px 0;
  text-decoration: underline; text-decoration-color: var(--cdi-sky); text-decoration-thickness: 2px; text-underline-offset: 5px;
  transition: color 150ms ease;
}
.examples button:hover { color: var(--cdi-imperial); text-decoration-color: var(--cdi-imperial); }

/* Turns */
.turn { margin: 0 0 28px; }
.turn.user { display: flex; justify-content: flex-end; }
.turn.user .bubble { background: var(--cdi-stone); padding: 9px 14px; max-width: 85%; font-size: 16px; line-height: 1.45; white-space: pre-wrap; }
.turn.assistant .bubble { font-size: 17px; line-height: 1.58; }
.turn.assistant .bubble p { margin: 0 0 12px; }
.turn.assistant .bubble ul, .turn.assistant .bubble ol { margin: 0 0 12px; padding-left: 22px; }
.turn.assistant .bubble li { margin-bottom: 4px; }
.turn.assistant .bubble li::marker { color: var(--cdi-muted); }
.turn.assistant code { font-family: var(--cdi-font-mono); font-size: .84em; background: var(--cdi-stone); padding: 1px 4px; letter-spacing: 0; }
.turn.assistant pre {
  font-family: var(--cdi-font-mono); font-size: 13px; line-height: 1.6; letter-spacing: 0;
  background: var(--cdi-stone); padding: 14px 18px; margin: 4px 0 14px; white-space: pre-wrap; overflow-x: auto;
}
.turn.assistant pre code { background: none; padding: 0; font-size: inherit; }
.codeblock { position: relative; }
.codeblock pre { padding-right: 84px; }
.copy-code { position: absolute; top: 8px; right: 8px; font-family: var(--cdi-font-mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--cdi-muted); background: transparent; border: 1px solid transparent; padding: 4px 8px; cursor: pointer; }
.copy-code:hover, .copy-code:focus-visible { color: var(--cdi-imperial); border-color: currentColor; }

/* Thinking: the dotted rule, its dots lighting up in turn */
.thinking {
  display: flex; align-items: center; gap: 14px; padding: 4px 0;
  font-family: var(--cdi-font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: var(--cdi-tracking-mono); color: var(--cdi-muted);
}
.thinking svg { flex: none; color: var(--cdi-imperial); width: 100px; height: 8px; }
.thinking circle { opacity: .18; animation: cdi-pulse 1.5s ease-in-out infinite; }
.thinking circle:nth-child(2) { animation-delay: .15s; }
.thinking circle:nth-child(3) { animation-delay: .3s; }
.thinking circle:nth-child(4) { animation-delay: .45s; }
.thinking circle:nth-child(5) { animation-delay: .6s; }
@keyframes cdi-pulse { 0%, 100% { opacity: .18; } 35% { opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .thinking circle { animation: none; opacity: .6; } }

/* Sources and feedback: compact, secondary to the answer */
.sources { margin-top: 16px; }
.sources .eyebrow { margin-bottom: 6px; color: var(--cdi-muted); }
.sources ol { list-style: none; margin: 0; padding: 0; counter-reset: src; }
.sources li { counter-increment: src; display: flex; gap: 10px; align-items: flex-start; margin-bottom: 3px; font-size: 14px; line-height: 1.4; }
.sources li::before {
  content: counter(src); flex: none; width: 16px; height: 16px; border-radius: 50%;
  background: var(--cdi-sky); color: var(--cdi-imperial);
  font-family: var(--cdi-font-mono); font-size: 9px; line-height: 16px; text-align: center; letter-spacing: 0;
  margin-top: 2px;  /* centres the circle on the first line of a wrapped title */
}
.sources .at { font-family: var(--cdi-font-mono); font-size: 11px; letter-spacing: 0.04em; color: var(--cdi-faint); white-space: nowrap; }

.rate { margin-top: 10px; display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.rate .eyebrow { margin: 0 8px 0 0; color: var(--cdi-faint); }
.rate button.thumb { width: 28px; height: 28px; display: inline-flex; align-items: center; justify-content: center; color: var(--cdi-muted); }
.rate button.thumb:hover { background: var(--cdi-stone); color: var(--cdi-imperial); }
.rate button.thumb.on { background: var(--cdi-imperial); color: var(--cdi-white); }
.rate svg { width: 15px; height: 15px; }
.rate .thanks { font-family: var(--cdi-font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: var(--cdi-tracking-mono); color: var(--cdi-muted); margin-left: 8px; }
.comment { margin-top: 10px; max-width: 520px; }
.comment textarea { font-size: 15px; padding: 9px 12px; }
.comment .cdi-btn { margin-top: 8px; padding: 7px 16px; font-size: 14px; }

/* Composer: one frame holding the question, the mode and the send button */
.dock { padding: 8px max(var(--space-x), calc((100% - var(--col)) / 2)) 14px; background: var(--cdi-white); }
.composer { position: relative; border: 1.5px solid var(--cdi-imperial); background: var(--cdi-white); }
.composer:focus-within { outline: 2px solid var(--cdi-imperial); outline-offset: 2px; }
.composer textarea { border: 0; outline: none; resize: none; padding: 12px 14px 4px; font-size: 16px; line-height: 1.5; max-height: 220px; display: block; }
.composer-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 4px 6px 6px 12px; }
.send { width: 32px; height: 32px; display: inline-flex; align-items: center; justify-content: center; background: var(--cdi-imperial); color: var(--cdi-white); transition: background-color 150ms ease; }
.send:hover { background: var(--cdi-imperial-hover); }
.send svg { width: 17px; height: 17px; }
.fine { font-size: 12px; color: var(--cdi-faint); margin: 8px 0 0; }

/* Work / Learn: always visible. Once a conversation has started, the other mode starts a new conversation. */
.modebar { display: flex; align-items: center; gap: 6px; }
/* Asks before the other mode starts a new conversation, in the same Stone card as the help panel */
.mode-confirm {
  position: absolute; left: -1.5px; bottom: calc(100% + 10px); z-index: 11; width: min(340px, 80vw);
  background: var(--cdi-stone); color: var(--cdi-imperial); border: 1.5px solid var(--cdi-imperial); padding: 14px 16px; font-size: 14px; line-height: 1.45;
}
.mode-confirm p { margin: 0; }
.mode-confirm b { font-weight: 600; }
.mode-confirm-foot { display: flex; align-items: center; gap: 16px; margin-top: 12px; }
.mode-confirm-foot .cdi-btn { margin: 0 0 0 auto; padding: 7px 14px; font-size: 13px; }
.mode-confirm-foot .link { font-size: 13px; padding: 4px 0; margin: 0; }
.modes { display: inline-flex; border: 1px solid var(--cdi-imperial); }
.modes button {
  font-family: var(--cdi-font-mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: var(--cdi-tracking-mono);
  padding: 4px 10px; color: var(--cdi-imperial); background: var(--cdi-white); transition: background-color 150ms ease, color 150ms ease;
}
.modes button:hover { background: var(--cdi-stone); }
.modes button[aria-checked="true"] { background: var(--cdi-imperial); color: var(--cdi-white); }
sup.cite { font-size: 0.7em; line-height: 0; margin-left: 1px; }
sup.cite a { font-family: var(--cdi-font-mono); text-decoration: none; padding: 0 2px; color: var(--cdi-imperial); }
sup.cite a:hover { text-decoration: underline; }
sup.cite a + a::before { content: ","; color: var(--cdi-muted); padding-right: 1px; }
.mode-help { position: relative; display: inline-flex; }
.help-btn { width: 26px; height: 26px; }
.help-btn svg { width: 15px; height: 15px; }
.mode-help-panel {
  display: none; position: absolute; left: -12px; bottom: calc(100% + 12px); z-index: 10; width: min(360px, 80vw);
  background: var(--cdi-stone); color: var(--cdi-imperial); padding: 16px 18px; font-size: 14px; line-height: 1.45;
}
.mode-help-panel p { margin: 0 0 10px; }
.mode-help-panel p:last-child { margin: 0; }
.mode-help-panel .eyebrow { margin: 0 0 3px; font-size: 10px; }
.mode-help-panel .note { color: var(--cdi-muted); font-size: 13px; }
.mode-help:hover .mode-help-panel, .mode-help:focus-within .mode-help-panel { display: block; }

/* First-visit tour: a Stone card beside a red ring around what it describes (no scrim, no shadow).
   Red is outside the CDI palette on purpose: it must stand out from the Sky accents. */
.tour-ring { position: fixed; z-index: 40; pointer-events: none; outline: 3px solid #E3342F; outline-offset: 4px; transition: all 200ms ease; }
.tour {
  position: fixed; z-index: 41; width: min(340px, calc(100vw - 32px)); padding: 18px 20px 14px;
  background: var(--cdi-stone); color: var(--cdi-imperial); border: 1.5px solid var(--cdi-imperial); font-size: 15px; line-height: 1.45;
}
.tour .eyebrow { margin-bottom: 8px; color: var(--cdi-muted); }
.tour h2 { font-size: 24px; margin: 0 0 8px; }
.tour p { margin: 0; }
.tour b { font-weight: 600; }
.tour-demo { margin-top: 14px; padding: 12px 14px; background: var(--cdi-white); font-size: 14px; }
.tour-demo .eyebrow { font-size: 10px; margin-bottom: 6px; }
.tour-demo .sources { margin-top: 10px; }
.tour-demo .sources .src { text-decoration: underline; text-underline-offset: 3px; }
.tour-foot { display: flex; align-items: center; gap: 16px; margin-top: 16px; }
.tour-foot #tour-next { margin-left: auto; padding: 8px 18px; font-size: 14px; }
.tour-foot .link { font-size: 13px; padding: 4px 0; }
@media (prefers-reduced-motion: reduce) { .tour-ring { transition: none; } }

/* Lesson pane: the transcript, scrolled to the cited passage */
.layout.with-pane { grid-template-columns: var(--side-w) minmax(0, 1fr) var(--pane-w); }
/* Drag handles on the panel edges. Invisible until hovered, focused, or dragged. */
.resizer { position: absolute; top: 0; bottom: 0; width: 10px; z-index: 5; cursor: col-resize; touch-action: none; outline: none; }
.resizer::after { content: ""; position: absolute; top: 0; bottom: 0; left: 4px; width: 2px; background: var(--cdi-sky); opacity: 0; transition: opacity 120ms ease; }
.resizer:hover::after, .resizer:focus-visible::after, .resizer.dragging::after { opacity: 1; }
#resize-side { left: calc(var(--side-w) - 5px); }
#resize-pane { right: calc(var(--pane-w) - 5px); display: none; }
.layout.with-pane #resize-pane { display: block; }
body.resizing { cursor: col-resize; user-select: none; }
.pane { background: var(--cdi-stone); overflow-y: auto; padding: 18px 22px 32px; }
.pane[hidden] { display: none; }
.pane-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.pane-head .eyebrow { margin: 6px 0 8px; color: var(--cdi-muted); }
.pane-head .icon-btn:hover { background: var(--cdi-stone-deep); }
.pane h2 { font-size: 24px; margin: 0 0 6px; }
.pane-meta { font-family: var(--cdi-font-mono); font-size: 11px; letter-spacing: 0.04em; color: var(--cdi-muted); margin: 0 0 12px; }
.pane-summary { font-size: 14px; line-height: 1.5; color: var(--cdi-muted); margin: 0 0 12px; }
.pane-open { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; margin: 0 0 20px; }
.pane-open svg { width: 14px; height: 14px; }
.pane-open[hidden] { display: none; }  /* talks and webinars with no Academy link: no dead link back to the app */
.pane-label { color: var(--cdi-muted); margin-bottom: 8px; }
.pane-chunk { padding: 10px 12px; margin: 0 -12px 2px; font-size: 14.5px; line-height: 1.55; transition: background-color 400ms ease; }
.pane-chunk.focus { background: var(--cdi-white); }
.pane-chunk .t { display: block; font-family: var(--cdi-font-mono); font-size: 10.5px; letter-spacing: 0.06em; color: var(--cdi-faint); margin-bottom: 4px; }
.pane-chunk.focus .t { color: var(--cdi-imperial); }
.pane-chunk p { margin: 0 0 8px; }
.pane-chunk p:last-child { margin: 0; }
.sources a.src { color: var(--cdi-imperial); }
.sources li.on a.src { text-decoration-color: var(--cdi-sky); text-decoration-thickness: 2px; }
.sources .course { color: var(--cdi-muted); font-size: 13px; }
.sources .course::before { content: "·"; margin-right: 6px; color: var(--cdi-faint); }
.turn.assistant .bubble li > ul { margin: 6px 0 4px; padding-left: 20px; list-style: disc; }

@media (max-width: 900px) {
  .layout.with-pane { grid-template-columns: 1fr; }
  .pane { position: fixed; inset: var(--top-h) 0 0 0; z-index: 20; }
  :root { --space-x: 20px; --top-h: 52px; }
  .top { padding: 0 16px; }
  .product { font-size: 16px; white-space: nowrap; }
  .layout { grid-template-columns: 1fr; }
  .side { display: none; }
  .resizer, .layout.with-pane #resize-pane { display: none; }
  .top-new { display: inline-flex; }
  .signin { grid-template-columns: 1fr; }
  .tiles { display: none; }
  .signin-body { padding: 56px 20px 32px; }
  .notice { padding: 56px 20px; }
  .welcome { padding-top: 2vh; }
  .top .cdi-chip { display: none; }
  .who { font-size: 0; gap: 0; } .who .link { font-size: 13px; }
  .thread { padding-top: 20px; }
  .turn.user .bubble { max-width: 92%; }
}

/* --- Admin (dense profile, section 8.2 of the guide) --------------------------------------------- */
.who-link { font-family: var(--cdi-font-display); font-size: 13px; letter-spacing: var(--cdi-tracking-body); color: var(--cdi-imperial); }
body.admin { overflow-y: auto; }
.admin-main { max-width: 1240px; margin: 0 auto; padding: 24px 24px 80px; }
.admin-main .msg { font-size: 15px; }
.tiles-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 8px; margin: 0 0 24px; }
.stat { background: var(--cdi-stone); padding: 14px 16px; display: flex; flex-direction: column; gap: 4px; }
.stat .eyebrow { margin: 0; color: var(--cdi-muted); }
.stat .fig { font-size: 24px; font-weight: 300; font-variation-settings: "GRAD" -20; line-height: 1.15; }
.stat .note { font-size: 12.5px; color: var(--cdi-muted); line-height: 1.35; }
.tabs { display: flex; gap: 24px; margin: 8px 0 20px; flex-wrap: wrap; }
.tabs button { font-family: var(--cdi-font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: var(--cdi-tracking-mono);
  color: var(--cdi-muted); padding: 6px 0; text-decoration: underline; text-decoration-color: transparent; text-decoration-thickness: 2px; text-underline-offset: 8px; }
.tabs button:hover { color: var(--cdi-imperial); }
.tabs button[aria-selected="true"] { color: var(--cdi-imperial); text-decoration-color: var(--cdi-sky); }
h2.sub { font-size: 22px; margin: 28px 0 12px; }
h2.sub .meta { font-size: 12px; }
.meta { font-family: var(--cdi-font-mono); font-size: 11px; letter-spacing: 0.04em; color: var(--cdi-muted); margin: 0 0 12px; }
.tbl-wrap { overflow-x: auto; margin: 0 0 16px; }
.tbl { width: 100%; border-collapse: collapse; font-size: 14px; line-height: 1.4; }
.tbl th { font-family: var(--cdi-font-mono); font-size: 10px; font-weight: 400; text-transform: uppercase; letter-spacing: var(--cdi-tracking-mono);
  color: var(--cdi-muted); text-align: left; padding: 6px 10px; white-space: nowrap; vertical-align: bottom; }
.tbl td { padding: 7px 10px; vertical-align: top; }
.tbl tbody tr:nth-child(odd) td { background: var(--cdi-stone); }
.tbl .n { text-align: right; font-family: var(--cdi-font-mono); font-size: 12.5px; letter-spacing: 0; white-space: nowrap; }
.tbl td.empty { color: var(--cdi-muted); font-style: italic; }
.tbl button.link { font-size: 14px; text-align: left; padding: 0; }
.sub-note { display: block; font-size: 12px; color: var(--cdi-muted); }
.status { font-family: var(--cdi-font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.08em; padding: 2px 6px; white-space: nowrap; }
.status.s-active { background: var(--cdi-sky); color: #010449; }
.status.s-invited { background: var(--cdi-stone-deep); }
.status.s-deactivated, .status.s-no-invite { color: var(--cdi-muted); }
/* Forms sit in their own Stone panel; lists below get clear space (the guide has no divider lines). */
.invite { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; margin: 0 0 12px; background: var(--cdi-stone); padding: 16px 18px 18px; }
.invite .form-title { flex-basis: 100%; margin: 0 0 2px; }
.invite .field { display: flex; flex-direction: column; min-width: 150px; }
.invite .field.grow { flex: 1; min-width: 220px; }
.invite .field .eyebrow { margin: 0 0 6px; color: var(--cdi-muted); }
.invite input, .invite select, .filters select { height: 40px; font-size: 15px; line-height: 1.2; padding: 0 12px; }
.invite .cdi-btn { margin: 0; height: 40px; padding: 0 20px; }
.invite .field select, .invite .field input { width: 100%; }
select { text-overflow: ellipsis; }
.invite select, .filters select { padding-right: 36px; }
/* One look for every dropdown: same height and outline as the text fields, with a drawn chevron. */
select {
  appearance: none; -webkit-appearance: none;
  font: inherit; letter-spacing: inherit; color: var(--cdi-imperial); background-color: var(--cdi-white);
  border: 1.5px solid var(--cdi-imperial); padding: 0 34px 0 12px; height: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23010449' stroke-width='1.75' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center; background-size: 16px;
}
:root[data-theme="dark"] select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FFFFFF' stroke-width='1.75' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
}
.filters.list-head { margin: 32px 0 10px; }
.invite-done { background: var(--cdi-stone); padding: 16px 18px; margin: 0 0 20px; font-size: 14px; }
.invite-done p { margin: 0 0 8px; }
.invite-done pre, pre.prompt, pre.ans { font-family: var(--cdi-font-mono); font-size: 12.5px; line-height: 1.6; white-space: pre-wrap; margin: 0 0 10px;
  background: var(--cdi-white); padding: 12px 14px; letter-spacing: 0; }
pre.prompt { background: var(--cdi-stone); max-height: 520px; overflow-y: auto; }
details { margin: 0 0 10px; }
details summary { cursor: pointer; font-size: 15px; padding: 6px 0; }
.two-col { display: grid; grid-template-columns: 2fr 1fr; gap: 16px; }
.fb { background: var(--cdi-stone); padding: 12px 16px; margin: 0 0 8px; font-size: 14px; }
.fb .meta { margin-bottom: 6px; }
.fb.down .meta b { color: var(--cdi-imperial); }
.fb-comment { font-size: 15px; margin: 0 0 8px; }
.fb-q { margin: 0 0 4px; }
.fb-q .eyebrow { display: inline; margin-right: 8px; color: var(--cdi-muted); }
.fb-a { font-size: 13.5px; color: var(--cdi-muted); white-space: pre-wrap; margin: 6px 0 0; }
.filters { display: flex; align-items: center; gap: 10px; margin: 0 0 10px; }
.filters .eyebrow { margin: 0; }
.filters select { min-width: 220px; }
.filters .filters { margin: 0; }
.filters .cdi-btn { height: 40px; padding: 0 20px; margin-left: 6px; }
.cond { display: inline-block; margin-right: 14px; font-size: 13px; white-space: nowrap; }
.score { display: inline-block; min-width: 22px; text-align: center; padding: 1px 4px; }
.score.sc-5, .score.sc-4 { background: var(--cdi-sky); color: #010449; }
.score.sc-1, .score.sc-2 { background: var(--cdi-imperial); color: var(--cdi-white); }
.tbl tr.expand td { background: var(--cdi-white) !important; padding: 12px 10px 18px; }
.answers { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 16px; }
.answers .eyebrow { margin: 0 0 6px; }
.reason { font-size: 13.5px; color: var(--cdi-muted); margin: 0 0 8px; }
pre.ans { background: var(--cdi-stone); max-height: 360px; overflow-y: auto; font-family: var(--cdi-font-display); font-size: 13.5px; }
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } .admin-main { padding: 16px; } }

/* --- Feedback (ADR-026) ------------------------------------------------------------------------- */
.chip-btn { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; border: 0; }
.chip-btn svg { width: 11px; height: 11px; }
.chip-btn:hover, .chip-btn:focus-visible { background: var(--cdi-imperial); color: var(--cdi-white); }
.chip-btn.hidden { display: none; }
.rate button.fb-open { width: 28px; height: 28px; display: inline-flex; align-items: center; justify-content: center; color: var(--cdi-muted); margin-left: 6px; }
.rate button.fb-open:hover { background: var(--cdi-stone); color: var(--cdi-imperial); }
.rate button.fb-open svg { width: 15px; height: 15px; }
.turn.flag .bubble { outline: 2px solid var(--cdi-sky); outline-offset: 8px; }
body.sheet-open .thread, body.sheet-open .pane { padding-bottom: calc(var(--sheet-h, 0px) + 24px); }
.sheet { position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; max-height: 72vh; overflow-y: auto;
  background: var(--cdi-stone); color: var(--cdi-imperial); }
.sheet[hidden] { display: none; }
.sheet-inner { max-width: 1080px; margin: 0 auto; padding: 16px 24px 18px; }
.sheet-head { display: flex; align-items: baseline; gap: 14px; }
.sheet-head .eyebrow { margin: 0; }
.sheet-about { margin: 0; font-size: 14px; color: var(--cdi-muted); flex: 1; }
.sheet-head .icon-btn:hover { background: var(--cdi-stone-deep); }
.sheet-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 8px 28px; margin-top: 10px; }
.sheet-col { display: flex; flex-direction: column; gap: 6px; }
.sheet-col > .eyebrow { margin: 8px 0 0; }
.sheet-col > .eyebrow:first-child { margin-top: 0; }
.sheet textarea { font-size: 15px; line-height: 1.45; padding: 9px 12px; resize: vertical; background: var(--cdi-white); }
.seg { border: 0; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.seg legend { margin: 0 0 6px; padding: 0; }
.seg label { position: relative; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg span { display: inline-block; padding: 6px 10px; font-size: 13.5px; line-height: 1.2; cursor: pointer;
  background: var(--cdi-white); color: var(--cdi-imperial); border: 1px solid var(--cdi-stone-deep); }
.seg label:hover span { border-color: var(--cdi-imperial); }
.seg input:checked + span { background: var(--cdi-imperial); color: var(--cdi-white); border-color: var(--cdi-imperial); }
.seg input:focus-visible + span { outline: 2px solid var(--cdi-sky); outline-offset: 2px; }
.check { display: flex; align-items: flex-start; gap: 8px; font-size: 14px; margin-top: 10px; }
.check[hidden] { display: none; }
.check input { width: 16px; height: 16px; margin: 2px 0 0; accent-color: var(--cdi-imperial); }
.sheet-foot { display: flex; align-items: center; gap: 16px; margin-top: 14px; flex-wrap: wrap; }
.fb-auto { flex: 1; min-width: 220px; font-size: 13px; color: var(--cdi-muted); }
.fb-auto summary { cursor: pointer; font-family: var(--cdi-font-mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: var(--cdi-tracking-mono); }
.fb-auto p { margin: 6px 0 0; max-width: 560px; line-height: 1.45; }
.fb-status { font-size: 13.5px; color: var(--cdi-muted); }
.sheet-foot .cdi-btn { margin: 0; }
@media (max-width: 900px) {
  .sheet-body { grid-template-columns: 1fr; }
  .sheet-inner { padding: 14px 16px; }
  .top .chip-btn:not(.hidden) { display: inline-flex; }
}

/* Admin: tester feedback */
.fbmode { display: flex; align-items: center; justify-content: space-between; gap: 24px; background: var(--cdi-stone); padding: 14px 18px; margin: 0 0 18px; }
.fbmode .eyebrow, .fbmode .meta { margin: 0; }
.fbmode .meta { margin-top: 4px; }
.switch { width: 46px; height: 26px; flex: none; background: var(--cdi-faint); position: relative; cursor: pointer; border: 0; }
.switch span { position: absolute; top: 3px; left: 3px; width: 20px; height: 20px; background: var(--cdi-white); transition: left 150ms ease; }
.switch[aria-checked="true"] { background: var(--cdi-imperial); }
.switch[aria-checked="true"] span { left: 23px; }
.switch:focus-visible { outline: 2px solid var(--cdi-sky); outline-offset: 2px; }
.fb-filters { flex-wrap: wrap; row-gap: 8px; }
.fb-filters select { min-width: 0; }
.fb-filters input[type="search"] { height: 40px; width: 200px; font-size: 15px; padding: 0 12px; }
.fb-filters .cdi-btn { height: 40px; padding: 0 20px; }
#testfb select.tf-st { height: 32px; font-size: 13.5px; padding: 0 30px 0 8px; min-width: 130px; }
#people select.role-sel { height: 32px; font-size: 13.5px; padding: 0 30px 0 8px; min-width: 150px; }
.imp { font-family: var(--cdi-font-mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: var(--cdi-tracking-mono); }
.imp-blocking { color: var(--cdi-imperial); font-weight: 700; }
.imp-annoying { color: var(--cdi-imperial); }
.imp-minor { color: var(--cdi-muted); }
.fb-detail { padding: 6px 4px 14px; }
.fb-cols { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 28px; }
.fb-text { white-space: pre-wrap; margin: 4px 0 14px; font-size: 15px; line-height: 1.5; }
blockquote.fb-text { margin-left: 0; padding: 8px 12px; background: var(--cdi-stone); }
.fb-turns { display: flex; flex-direction: column; gap: 6px; margin: 4px 0 14px; max-height: 420px; overflow-y: auto; }
.fb-turn { padding: 8px 12px; background: var(--cdi-stone); }
.fb-turn.assistant { background: transparent; }
.fb-turn.linked { outline: 2px solid var(--cdi-sky); outline-offset: -2px; }
.fb-turn p { margin: 4px 0 0; white-space: pre-wrap; font-size: 14px; line-height: 1.5; }
.fb-note { width: 100%; font-size: 14.5px; padding: 8px 12px; margin: 4px 0 8px; }
.facts { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 4px 14px; margin: 6px 0 14px; font-size: 13.5px; }
.facts dt { font-family: var(--cdi-font-mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: var(--cdi-tracking-mono); color: var(--cdi-muted); padding-top: 3px; }
.facts dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 900px) { .fb-cols { grid-template-columns: 1fr; } }
.digest-actions { display: flex; align-items: center; gap: 16px; flex: none; }
.digest-actions .cdi-btn { height: 40px; padding: 0 18px; }
.digest-box { border: 1px solid var(--cdi-stone-deep); padding: 16px 20px; margin: -8px 0 18px; background: var(--cdi-white); }
.digest-box > div { color: var(--cdi-imperial) !important; }

/* Admin: feedback cohorts */
#tab-testfb .sub { margin-top: 28px; }
#tab-testfb .sub:first-of-type { margin-top: 8px; }
.co-detail { padding: 8px 4px 14px; }
.co-add { display: flex; align-items: flex-end; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.co-add .field { display: flex; flex-direction: column; gap: 4px; min-width: 240px; }
.co-add select, .co-edit input { height: 40px; font-size: 15px; padding: 0 36px 0 12px; }
.co-add .cdi-btn { height: 40px; padding: 0 20px; margin: 0; }
.co-edit { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.co-edit .eyebrow { margin: 0; }
.co-edit input { padding: 0 12px; width: auto; }
.co-members { list-style: none; padding: 0; margin: 6px 0 0; columns: 2; column-gap: 32px; font-size: 14px; }
.co-members li { padding: 3px 0; break-inside: avoid; }
.co-members .link { font-size: 12.5px; margin-left: 6px; }
@media (max-width: 900px) { .co-members { columns: 1; } }

/* Learn mode: a video card after the paragraph a lesson supports */
.vcard { display: flex; align-items: center; gap: 12px; margin: 4px 0 14px; padding: 10px 12px; background: var(--cdi-stone); font-size: 14px; line-height: 1.35; }
.vcard .v-play { flex: none; width: 34px; height: 34px; display: grid; place-items: center; background: var(--cdi-sky); color: var(--cdi-imperial); }
.vcard .v-play svg { width: 16px; height: 16px; }
.vcard .v-body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.vcard .v-title { color: var(--cdi-imperial); }
.vcard .course { color: var(--cdi-muted); font-size: 13px; }
.vcard .v-watch { flex: none; font-family: var(--cdi-font-mono); font-size: 11px; letter-spacing: var(--cdi-tracking-mono); text-transform: uppercase; text-decoration: none; padding: 7px 12px; background: var(--cdi-imperial); color: var(--cdi-white); }
.vcard .v-watch:hover { background: var(--cdi-imperial-hover); }
.vcard a:focus-visible { outline: 2px solid var(--cdi-sky); outline-offset: 2px; }

/* Course lists from the catalogue: one block per course, lessons in order by module */
.outline { margin-top: 14px; display: grid; gap: 6px; }
.outline details { background: var(--cdi-stone); padding: 8px 12px; }
.outline summary { cursor: pointer; font-size: 15px; }
.outline summary .course { color: var(--cdi-muted); font-size: 13px; margin-left: 4px; }
.outline .o-body { padding: 6px 0 4px; font-size: 14px; line-height: 1.4; }
.outline .o-page { display: inline-block; margin-bottom: 6px; color: var(--cdi-imperial); }
.outline .o-section { margin: 8px 0 2px; font-family: var(--cdi-font-mono); font-size: 11px; letter-spacing: var(--cdi-tracking-mono); text-transform: uppercase; color: var(--cdi-muted); }
.outline ol { margin: 0; padding-left: 26px; }
.outline li { margin-bottom: 2px; }
.outline li a { color: var(--cdi-imperial); }
.outline .at { font-family: var(--cdi-font-mono); font-size: 11px; color: var(--cdi-faint); white-space: nowrap; }