/* Kubernetes for Ops — course site
   Devoteam brand, April 2026 guidelines.
   Colour p40, typography p25, components p35–38. */

@font-face {
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 300 800;
  font-display: swap;
  src: url('/static/fonts/montserrat-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212,
    U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 300 800;
  font-display: swap;
  src: url('/static/fonts/montserrat-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304,
    U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0,
    U+2113, U+2C60-2C7F, U+A720-A7FF;
}

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

:root {
  /* Brand primary */
  --poppy: #f8485e;
  --poppy-light: #fca2ae;
  --poppy-lighter: #fddade;
  --dark-grey: #3c3c3a;
  --white: #ffffff;

  /* Brand secondary — backgrounds and graphics only, never text */
  --aqua: #d7ebe7;
  --beige: #efeadc;
  --light-grey: #efeeee;

  /* Brand accent — data and section coding only */
  --fire: #fcc354;
  --mint: #5ab891;
  --lagoon: #4a8cca;
  --candy: #ec86a3;
  --violet: #63238c;

  /* Dark surfaces, derived from Dark Grey. The brand sanctions a dark mode
     with surfaces "slightly elevated from background" (p35). */
  --bg: #1b1b1a;
  --surface: #232322;
  --surface-2: #2c2c2a;
  --line: #3a3a37;
  --text: #f2f0ee;
  --text-muted: #a5a29e;
  --text-dim: #7c7975;

  /* Radii, p37 */
  --r-card: 15px;
  --r-hero: 25px;
  --r-btn: 12px;
  --r-label: 12px;
  --r-modal: 24px;

  --shell: min(1180px, 100% - 3rem);
  --header-h: 74px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---- reset ------------------------------------------------------------ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Montserrat', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* ---- typography, brand p25 -------------------------------------------- */

h1, h2, h3, h4, h5, h6 { margin: 0 0 0.6em; letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 700; line-height: 1.2; }
h2 { font-size: clamp(1.6rem, 3.6vw, 2.25rem); font-weight: 700; line-height: 1.25; }
h3 { font-size: 1.75rem; font-weight: 600; line-height: 1.3; }
h4 { font-size: 1.5rem; font-weight: 600; line-height: 1.35; }
h5 { font-size: 1.25rem; font-weight: 500; line-height: 1.4; }
h6 { font-size: 1rem; font-weight: 700; line-height: 1.5; text-transform: uppercase; letter-spacing: 0.05em; }

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--poppy); text-decoration: none; border-bottom: 1px solid rgba(248, 72, 94, 0.35); transition: border-color 0.18s var(--ease); }
a:hover { border-bottom-color: var(--poppy); }

/* Signal a link that leaves the site, so nobody is surprised by a new tab. */
.slide a[target="_blank"]::after,
.notes-panel a[target="_blank"]::after {
  content: '↗';
  display: inline-block;
  margin-left: 0.2em;
  font-size: 0.8em;
  vertical-align: 0.15em;
  opacity: 0.7;
}

strong { font-weight: 600; color: var(--white); }
em { font-style: italic; color: var(--poppy-light); font-weight: 500; }

small, .small { font-size: 0.875rem; line-height: 1.5; }

.eyebrow {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--poppy);
  margin: 0 0 0.75rem;
}

.lead { font-size: 1.125rem; line-height: 1.6; color: var(--text-muted); max-width: 62ch; }

blockquote {
  margin: 1.5rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 2px solid var(--poppy);
  color: var(--text-muted);
  font-weight: 300;
  font-size: 1.125rem;
}

hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }

/* ---- code ------------------------------------------------------------- */

code, kbd, samp, pre {
  font-family: ui-monospace, SFMono-Regular, 'JetBrains Mono', Menlo, Consolas, monospace;
  font-size: 0.875em;
}

:not(pre) > code {
  background: rgba(248, 72, 94, 0.10);
  color: var(--poppy-light);
  padding: 0.12em 0.4em;
  border-radius: 6px;
  white-space: nowrap;
}

pre {
  position: relative;
  margin: 1.25rem 0;
  padding: 1.1rem 1.25rem;
  background: #141413;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow-x: auto;
  line-height: 1.55;
  tab-size: 2;
}
pre code { background: none; padding: 0; color: #e8e5e1; white-space: pre; }

.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  padding: 0.3rem 0.65rem;
  font-family: inherit;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-dim);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.18s var(--ease), color 0.18s var(--ease);
}
pre:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { color: var(--text); }
.copy-btn[data-copied='true'] { color: var(--mint); border-color: var(--mint); opacity: 1; }

/* ---- tables, p37: 15px outer radius, square rows ---------------------- */

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r-card); margin: 1.5rem 0; }
table { width: 100%; border-collapse: collapse; font-size: 0.9375rem; }
th, td { padding: 0.7rem 1rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
thead th {
  background: var(--surface-2);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  white-space: nowrap;
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr { transition: background 0.15s var(--ease); }
tbody tr:hover { background: rgba(255, 255, 255, 0.025); }

ul, ol { margin: 0 0 1.1em; padding-left: 1.3rem; }
li { margin-bottom: 0.4em; }
li::marker { color: var(--poppy); }

/* ---- buttons, p38 ----------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.35rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--r-btn);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--poppy); color: var(--white); border-bottom: 1px solid transparent; }
.btn--primary:hover { background: #e63e53; }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--line); border-bottom-color: var(--line); }
.btn--ghost:hover { border-color: var(--text-dim); }

/* Neon is an accent only, max 1–2 focal points per screen (p34). */
.btn--hero { box-shadow: 0 0 0 1px rgba(248, 72, 94, 0.4), 0 6px 30px rgba(248, 72, 94, 0.28); }

.label {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: var(--r-label);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border: 1px solid var(--line);
  color: var(--text-muted);
  background: var(--surface-2);
}
.label--live { color: var(--poppy); border-color: rgba(248, 72, 94, 0.45); background: rgba(248, 72, 94, 0.1); }
.label--soon { color: var(--text-dim); }
.label--preview { color: var(--fire); border-color: rgba(252, 195, 84, 0.4); background: rgba(252, 195, 84, 0.09); }

/* ---- header ----------------------------------------------------------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 60;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0 clamp(1rem, 3vw, 2rem);
  background: rgba(27, 27, 26, 0.8);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
/* The source SVG carries a lot of empty viewBox around the artwork, so it is
   cropped to the mark itself — otherwise a nominal 46px renders about 27px.
   Clear space around the logo equal to the height of the 'd', per brand p7. */
.site-header__logo { display: flex; align-items: center; border: 0; flex: 0 0 auto; padding-right: 0.75rem; }
.site-header__logo img { height: 40px; width: auto; display: block; }
.site-header__title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
  padding-left: 1.25rem;
  border-left: 1px solid var(--line);
}
.site-header__spacer { flex: 1 1 auto; }

.sessnav { display: flex; align-items: center; gap: 0.3rem; }
.sessnav a {
  display: grid;
  place-items: center;
  min-width: 30px;
  height: 30px;
  padding: 0 0.5rem;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-dim);
}
.sessnav a:hover { color: var(--text); background: var(--surface-2); }
.sessnav a[aria-current='page'] { color: var(--white); background: var(--poppy); }
/* Instructor-only cues: what students can currently reach. */
.sessnav a.is-preview { color: var(--fire); }
.sessnav a.is-hidden-stage { opacity: 0.35; }
.sessnav a.is-hidden-stage::after { content: '·'; margin-left: 2px; }

.site-header__admin { color: var(--poppy); border-bottom-color: transparent; font-weight: 500; }

.site-header__user { display: flex; align-items: center; gap: 0.75rem; font-size: 0.8125rem; color: var(--text-dim); }
.site-header__user form { margin: 0; }
.site-header__user button {
  background: none; border: 0; padding: 0; cursor: pointer;
  font: inherit; color: var(--text-dim); text-decoration: underline; text-underline-offset: 3px;
}
.site-header__user button:hover { color: var(--text); }

@media (max-width: 860px) {
  .site-header__title, .site-header__user span { display: none; }
}

/* ---- deck and slides -------------------------------------------------- */

.deck { scroll-snap-type: y proximity; }

.slide {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  scroll-snap-align: start;
  scroll-snap-stop: normal;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 3rem) 0 4rem;
  /* the soft turn */
  transform-origin: 50% 0%;
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
.slide__inner { width: var(--shell); margin: 0 auto; }

/* Sections longer than a viewport opt out of snapping entirely. */
.slide--scroll { min-height: 0; scroll-snap-align: none; padding: 3rem 0; align-items: flex-start; }

.deck .slide.is-past { opacity: 0.25; transform: translateY(-2.5%) scale(0.965); }
.deck .slide.is-future { opacity: 0.35; transform: translateY(2%) scale(0.985); }
.deck .slide.is-current { opacity: 1; transform: none; }

.slide + .slide::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: var(--shell);
  border-top: 1px solid var(--line);
}
.slide--scroll + .slide::before, .slide--cover + .slide::before { border-top-color: transparent; }

/* ---- cover slide ------------------------------------------------------ */

.slide--cover .slide__inner { max-width: 62rem; }
.cover__title { font-size: clamp(2.5rem, 7vw, 4rem); font-weight: 800; line-height: 1.1; letter-spacing: -0.02em; margin-bottom: 1rem; }
.cover__title em { font-style: normal; color: var(--poppy); font-weight: 800; }
.cover__meta { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.75rem; }

/* Glass, p36: one element only, never stacked, 12–16px blur, 70–85% opacity. */
.glass {
  background: rgba(44, 44, 42, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: var(--r-hero);
  padding: clamp(1.5rem, 3vw, 2rem);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45);
}

.hero-glow {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: -1;
}
.hero-glow::after {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 44vw;
  height: 44vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(248, 72, 94, 0.20) 0%, rgba(248, 72, 94, 0) 68%);
  filter: blur(30px);
}

/* ---- bento, p34 ------------------------------------------------------- */

.bento { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1rem; margin: 0 0 1.75rem; }
.card {
  grid-column: span 4;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.card--wide { grid-column: span 6; }
.card--full { grid-column: span 12; }
.card--tint { background: var(--surface-2); }
a.card { border-bottom: 1px solid var(--line); color: inherit; }
a.card:hover { border-color: rgba(248, 72, 94, 0.5); transform: translateY(-2px); }
.card h3, .card h4 { margin-bottom: 0.35rem; }
.card p { color: var(--text-muted); font-size: 0.9375rem; }
.card__foot { margin-top: auto; padding-top: 0.85rem; font-size: 0.8125rem; color: var(--text-dim); }

/* A single glowing number per screen, per the neon rule.
   Written as p.stat rather than .stat so it outranks the .card p rule above. */
p.stat, .stat {
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1;
  color: var(--poppy);
  letter-spacing: -0.02em;
  margin-bottom: 0.15rem;
}
.stat--glow { text-shadow: 0 0 28px rgba(248, 72, 94, 0.45); }
p.stat__label, .stat__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  font-weight: 700;
  margin-bottom: 0.85rem;
}

@media (max-width: 900px) {
  .card, .card--wide { grid-column: span 6; }
}
@media (max-width: 620px) {
  .card, .card--wide, .card--full { grid-column: span 12; }
}

/* ---- session index ---------------------------------------------------- */

.session-row {
  display: grid;
  grid-template-columns: 3.5rem 1fr auto;
  gap: 1.25rem;
  align-items: baseline;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  margin-bottom: 0.6rem;
  color: inherit;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.session-row:hover { border-color: rgba(248, 72, 94, 0.5); background: var(--surface); }
.session-row__num { font-size: 1.5rem; font-weight: 800; color: var(--poppy); line-height: 1; }
.session-row__title { font-weight: 600; }
.session-row__summary { font-size: 0.875rem; color: var(--text-muted); margin: 0.25rem 0 0; }
.session-row--soon { opacity: 0.62; }

@media (max-width: 620px) {
  .session-row { grid-template-columns: 2.5rem 1fr; }
  .session-row > .label { grid-column: 2; justify-self: start; }
}

/* ---- callouts --------------------------------------------------------- */

.callout {
  border-left: 3px solid var(--poppy);
  background: var(--surface);
  border-radius: 0 var(--r-card) var(--r-card) 0;
  padding: 1.15rem 1.4rem;
  margin: 1.5rem 0;
}
.callout__title { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--poppy); margin-bottom: 0.4rem; }
.callout--mint { border-left-color: var(--mint); }
.callout--mint .callout__title { color: var(--mint); }
.callout--fire { border-left-color: var(--fire); }
.callout--fire .callout__title { color: var(--fire); }

/* ---- quiz ------------------------------------------------------------- */

.quiz {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  padding: 1.6rem;
  margin: 1.75rem 0;
}
.quiz__eyebrow { font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.08em; color: var(--poppy); margin: 0 0 0.5rem; }
.quiz__prompt { font-size: 1.0625rem; font-weight: 500; margin-bottom: 1rem; color: var(--text); }
.quiz__options { list-style: none; margin: 0 0 1.1rem; padding: 0; display: grid; gap: 0.45rem; }
.quiz__options label {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
  cursor: pointer;
  font-size: 0.9375rem;
  transition: border-color 0.15s var(--ease), background 0.15s var(--ease);
}
.quiz__options label:hover { border-color: var(--text-dim); }
.quiz__options input { margin: 0.35rem 0 0; accent-color: var(--poppy); flex: 0 0 auto; }
.quiz__options input:checked + span { color: var(--white); font-weight: 500; }
.quiz__options label:has(input:checked) { border-color: var(--poppy); background: rgba(248, 72, 94, 0.07); }

.quiz__text, .quiz__textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  margin-bottom: 1.1rem;
  font-family: inherit;
  font-size: 0.9375rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
  resize: vertical;
}
.quiz__text:focus, .quiz__textarea:focus { outline: 2px solid var(--poppy); outline-offset: 1px; border-color: transparent; }

.quiz__actions { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.quiz__verdict { font-size: 0.875rem; font-weight: 500; }
.quiz__verdict[data-state='right'] { color: var(--mint); }
.quiz__verdict[data-state='wrong'] { color: var(--poppy-light); }
.quiz__verdict[data-state='info'] { color: var(--text-muted); }
.quiz__verdict[data-state='revealed'] { color: var(--fire); }
.quiz.is-right { border-color: rgba(90, 184, 145, 0.5); }
.quiz.is-revealed { border-color: rgba(252, 195, 84, 0.45); }

/* ---- progress rail ---------------------------------------------------- */

.rail {
  position: fixed;
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 50;
  display: grid;
  gap: 0.55rem;
}
.rail button {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--line);
  cursor: pointer;
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}
.rail button:hover { background: var(--text-dim); transform: scale(1.3); }
.rail button[aria-current='true'] { background: var(--poppy); transform: scale(1.4); }
@media (max-width: 1080px) { .rail { display: none; } }

/* ---- footer ----------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem 0 3rem;
  font-size: 0.8125rem;
  color: var(--text-dim);
}
.site-footer__inner { width: var(--shell); margin: 0 auto; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; align-items: center; }
.site-footer img { height: 32px; width: auto; opacity: 0.8; }
.tagline { font-weight: 700; color: var(--poppy); }

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

.login { min-height: 100vh; display: grid; place-items: center; padding: 2rem 1.5rem; position: relative; }
.login__card { width: min(420px, 100%); }
.login__card img { height: 32px; margin-bottom: 2rem; }
.login__card h1 { font-size: 1.75rem; font-weight: 700; margin-bottom: 0.35rem; }
.login__card .lead { font-size: 0.9375rem; margin-bottom: 1.75rem; }
.field { margin-bottom: 1rem; }
.field label { display: block; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); margin-bottom: 0.4rem; }
.field input {
  width: 100%;
  padding: 0.75rem 0.9rem;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
}
.field input:focus { outline: 2px solid var(--poppy); outline-offset: 1px; border-color: transparent; }
.form-error { color: var(--poppy-light); font-size: 0.875rem; margin-bottom: 1rem; }

/* ---- present mode ----------------------------------------------------- */

.present-bar { display: flex; align-items: center; gap: 0.5rem; }

body.presenting { overflow: hidden; }
body.presenting .site-header,
body.presenting .rail,
body.presenting .site-footer,
body.presenting .slide-tail { display: none; }

body.presenting .deck { scroll-snap-type: none; }

body.presenting .slide {
  position: fixed;
  inset: 0;
  min-height: 100vh;
  padding: 4rem 0 6rem;
  margin: 0;
  background: var(--bg);
  overflow-y: auto;
  opacity: 0;
  pointer-events: none;
  transform: translateY(1.5%) scale(0.99);
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
  z-index: 10;
}
body.presenting .slide::before { display: none; }
body.presenting .slide.is-showing {
  opacity: 1;
  pointer-events: auto;
  transform: none;
  z-index: 20;
}
body.presenting .slide__inner { max-width: 1100px; }
body.presenting .slide__inner { font-size: 1.125rem; }
body.presenting h2 { font-size: clamp(2rem, 4.5vw, 3rem); }
body.presenting .quiz { display: none; }

.present-hud {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 40;
  display: none;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem clamp(1rem, 3vw, 2rem);
  background: rgba(20, 20, 19, 0.92);
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  color: var(--text-dim);
}
body.presenting .present-hud { display: flex; }
.present-hud__count { font-variant-numeric: tabular-nums; font-weight: 600; color: var(--text); }
.present-hud__title { flex: 1 1 auto; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.present-hud__keys { color: var(--text-dim); }
.present-hud kbd {
  display: inline-block;
  padding: 0.1rem 0.35rem;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface-2);
  font-size: 0.6875rem;
  color: var(--text-muted);
}
.present-hud__progress { position: absolute; left: 0; top: -2px; height: 2px; background: var(--poppy); transition: width 0.3s var(--ease); }

/* Presenter notes: instructor-only, and only in present mode. */
.notes-panel {
  position: fixed;
  right: 0; bottom: 0;
  width: min(460px, 42vw);
  max-height: 55vh;
  overflow-y: auto;
  z-index: 45;
  display: none;
  padding: 1.25rem 1.4rem 3.5rem;
  background: rgba(20, 20, 19, 0.97);
  border-left: 1px solid var(--line);
  border-top: 1px solid var(--line);
  border-radius: var(--r-modal) 0 0 0;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--text-muted);
}
body.presenting.notes-on .notes-panel { display: block; }
.notes-panel h6 { color: var(--poppy); margin-bottom: 0.75rem; }
.notes-panel strong { color: var(--text); }
.notes-panel :not(pre) > code { font-size: 0.8125rem; }

.slide-tail { text-align: center; padding: 0 0 4rem; }

/* ---- chapter dividers -------------------------------------------------- */

/* Marks where the pre-read stops and the live session starts. Shorter than a
   full panel so it reads as a break in the flow, not as another slide of
   content — and it doubles as a title card in present mode. */
.slide--chapter {
  min-height: 0;
  padding: 5rem 0;
  align-items: center;
  text-align: center;
}
.slide--chapter .slide__inner { max-width: 46rem; }
.slide--chapter .eyebrow { color: var(--text-dim); }
.chapter__title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 0.85rem;
}
.chapter__blurb { color: var(--text-muted); font-size: 1.0625rem; margin: 0 auto; max-width: 34rem; }

/* A poppy rule above and below, which is the actual separator. */
.slide--chapter::after,
.slide--chapter .slide__inner::after {
  content: '';
  display: block;
  width: 3.5rem;
  height: 2px;
  margin: 0 auto;
  background: var(--poppy);
  box-shadow: 0 0 18px rgba(248, 72, 94, 0.5);
}
.slide--chapter::after { position: absolute; top: 2.5rem; left: 50%; transform: translateX(-50%); }
.slide--chapter .slide__inner::after { margin-top: 2rem; }

/* The divider supplies the break, so suppress the generic section rule. */
.slide--chapter::before,
.slide--chapter + .slide::before { border-top-color: transparent !important; }

body.presenting .slide--chapter { padding: 4rem 0; align-items: center; }
body.presenting .slide--chapter::after { top: 22%; }

/* ---- session stage cues ----------------------------------------------- */

.session-row--preview { border-color: rgba(252, 195, 84, 0.3); }
/* Instructor view of a session students cannot reach: still a working link. */
.session-row--hidden { opacity: 0.5; border-style: dashed; }
/* Student view of the same thing: visible, so the shape of the course is
   obvious from day one, but plainly not open yet.
   Dimmed with explicit colours rather than a blanket opacity — flattening the
   whole row to 40% killed the Poppy on the number and left it looking broken
   rather than pending. */
.session-row--locked {
  cursor: default;
  border-style: dashed;
  border-color: rgba(248, 72, 94, 0.22);
  background: linear-gradient(90deg, rgba(248, 72, 94, 0.05), rgba(248, 72, 94, 0.015) 45%, transparent);
}
.session-row--locked:hover {
  border-color: rgba(248, 72, 94, 0.22);
  background: linear-gradient(90deg, rgba(248, 72, 94, 0.05), rgba(248, 72, 94, 0.015) 45%, transparent);
}
.session-row--locked .session-row__num { color: rgba(248, 72, 94, 0.6); }
.session-row--locked .session-row__title { color: var(--text-muted); font-weight: 500; }
.session-row--locked .session-row__summary { color: var(--text-dim); }
.session-row--locked .label {
  color: var(--poppy-light);
  border-color: rgba(252, 162, 174, 0.3);
  background: rgba(248, 72, 94, 0.07);
}

.stage-banner {
  padding: calc(var(--header-h) + 1.5rem) 0 0;
}
.stage-banner .slide__inner {
  width: var(--shell);
  margin: 0 auto;
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  padding: 1rem 1.25rem;
  border: 1px solid rgba(252, 195, 84, 0.3);
  background: rgba(252, 195, 84, 0.06);
  border-radius: var(--r-card);
}
.stage-banner p { margin: 0; color: var(--text-muted); font-size: 0.9375rem; flex: 1 1 22rem; }
.stage-banner + .deck .slide:first-child { padding-top: 2.5rem; min-height: 0; }

/* ---- admin ------------------------------------------------------------ */

.admin { padding: calc(var(--header-h) + 3rem) 0 5rem; }
.admin h2 { margin-top: 3.5rem; scroll-margin-top: calc(var(--header-h) + 1rem); }
.admin h2:first-of-type { margin-top: 2.5rem; }
.admin-count { font-size: 1rem; font-weight: 500; color: var(--text-dim); }
.admin-num { color: var(--text-dim); font-variant-numeric: tabular-nums; }
.admin-table { font-size: 0.875rem; }
.admin-table td { vertical-align: middle; }
.admin-table .label { margin-left: 0.5rem; }

.flash { padding: 0.85rem 1.15rem; border-radius: var(--r-card); margin-bottom: 1.5rem; font-size: 0.9375rem; }
.flash--ok { border: 1px solid rgba(90, 184, 145, 0.45); background: rgba(90, 184, 145, 0.08); color: var(--mint); }
.flash--bad { border: 1px solid rgba(248, 72, 94, 0.45); background: rgba(248, 72, 94, 0.08); color: var(--poppy-light); }

.stage-form { display: flex; gap: 0.25rem; }
.stage-btn {
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-dim);
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease), background 0.15s var(--ease);
}
.stage-btn:hover { color: var(--text); border-color: var(--text-dim); }
.stage-btn.is-on { color: var(--text); border-color: var(--text-dim); background: var(--surface-2); }
.stage-btn--preview.is-on { color: var(--bg); background: var(--fire); border-color: var(--fire); }
.stage-btn--full.is-on { color: var(--white); background: var(--poppy); border-color: var(--poppy); }

/* A heading with an action on the right. */
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}
.section-head h2 { margin: 0; }

/* Modals, brand p37: 24px radius, stronger elevation than a card. */
.modal {
  width: min(30rem, calc(100vw - 2.5rem));
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-modal);
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
}
.modal::backdrop { background: rgba(12, 12, 11, 0.7); backdrop-filter: blur(3px); }
/* showModal() focuses the dialog itself, which draws the browser's own ring
   around the whole card. Focus is still moved into the first field by ui.js. */
.modal:focus, .modal:focus-visible { outline: none; }
.modal form { padding: 1.75rem; margin: 0; }
.modal h3 { font-size: 1.375rem; margin-bottom: 0.35rem; }
.modal .small { color: var(--text-muted); margin-bottom: 1.25rem; }
.modal label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}
.modal textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
  resize: vertical;
}
.modal textarea:focus { outline: 2px solid var(--poppy); outline-offset: 1px; border-color: transparent; }
.modal__actions { display: flex; justify-content: flex-end; gap: 0.6rem; margin-top: 1.25rem; }

/* Without <dialog> support the modal stays inline rather than disappearing. */
.modal:not([open]) { display: none; }

code.pw { white-space: nowrap; background: var(--surface-2); color: var(--fire); user-select: all; }

.admin-actions { display: flex; gap: 0.75rem; white-space: nowrap; }
.admin-actions form { margin: 0; }
.linkbtn { background: none; border: 0; padding: 0; font: inherit; font-size: 0.8125rem; color: var(--text-dim); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.linkbtn:hover { color: var(--text); }
.linkbtn--danger:hover { color: var(--poppy); }

.admin-revealed { color: var(--fire); font-size: 0.75rem; margin-left: 0.35rem; }

/* The progress strip is a button: grouped per session, click for the detail. */
.pgrid {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
  padding: 0.4rem 0.6rem;
  margin: -0.4rem -0.6rem;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--r-btn);
  font: inherit;
  cursor: pointer;
  text-align: left;
}
.pgrid:hover { border-color: var(--line); background: var(--surface-2); }
.pgrid:focus-visible { outline: 2px solid var(--poppy); outline-offset: 1px; }

.pgroup { display: inline-flex; flex-direction: column; gap: 3px; }
.pgroup--idle { opacity: 0.5; }
.pgroup__label { font-size: 0.5625rem; font-weight: 700; letter-spacing: 0.06em; color: var(--text-dim); line-height: 1; }
.pgroup__cells { display: inline-flex; gap: 3px; }

.pcell {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  display: inline-block;
  flex: 0 0 auto;
}
.pcell--none { background: var(--surface-2); border: 1px solid var(--line); }
.pcell--attempted { background: rgba(248, 72, 94, 0.4); }
.pcell--revealed { background: var(--fire); }
.pcell--correct { background: var(--mint); }

.pgrid__more { font-size: 0.75rem; color: var(--text-dim); text-decoration: underline; text-underline-offset: 3px; }
.pgrid:hover .pgrid__more { color: var(--text); }

.legend { display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap; color: var(--text-dim); margin-top: 0.85rem; }
.nowrap { white-space: nowrap; }

/* ---- per-person detail dialog ----------------------------------------- */

.modal--wide { width: min(46rem, calc(100vw - 2.5rem)); }
/* Scrolling lives on the dialog, not on an inner div. Chrome makes a scroll
   container keyboard-focusable and draws its own ring around it, which looked
   like a stray blue border inside the card. */
.modal--wide { max-height: min(80vh, 44rem); overflow-y: auto; }
.modal__body { padding: 1.75rem; }
.modal__head { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; margin-bottom: 1.5rem; }
.modal__head h3 { margin-bottom: 0.25rem; }
.modal__head .small { color: var(--text-muted); margin: 0; }
.modal__x {
  background: none;
  border: 0;
  padding: 0 0.25rem;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-dim);
  cursor: pointer;
}
.modal__x:hover { color: var(--text); }
/* This is the first focusable element in the detail dialog, so it takes focus
   on open. Brand the ring rather than leaving the browser's blue. */
.modal__x:focus-visible { outline: 2px solid var(--poppy); outline-offset: 2px; border-radius: 6px; color: var(--text); }

.qgroup { margin-bottom: 1.75rem; }
.qgroup h4 { font-size: 0.875rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); margin-bottom: 0.75rem; }

.qrow {
  display: flex;
  gap: 0.8rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--r-btn);
  margin-bottom: 0.4rem;
}
.qrow .pcell { margin-top: 0.2rem; }
.qrow--none { opacity: 0.55; }
.qrow__main { min-width: 0; }
.qrow__prompt { font-size: 0.9375rem; margin: 0 0 0.2rem; }
.qrow__meta { font-size: 0.75rem; color: var(--text-dim); margin: 0; }
.qrow__state { font-weight: 600; color: var(--text-muted); }
.qrow--correct .qrow__state { color: var(--mint); }
.qrow--revealed .qrow__state { color: var(--fire); }
.qrow--attempted .qrow__state { color: var(--poppy-light); }
.qrow__answer {
  margin: 0.5rem 0 0;
  padding: 0.5rem 0.7rem;
  background: var(--bg);
  border-radius: 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.8125rem;
  color: var(--text-muted);
  overflow-wrap: anywhere;
}
/* A picked option is prose the author wrote, not something typed by the
   student, so it reads better in the body face. */
.qrow__answer--picked {
  font-family: inherit;
  font-size: 0.875rem;
  line-height: 1.5;
}
.qrow__answer--picked::before {
  content: 'Picked: ';
  font-weight: 600;
  color: var(--text-dim);
}

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

@media print {
  .site-header, .rail, .present-hud, .notes-panel, .copy-btn, .quiz__actions { display: none !important; }
  body { background: #fff; color: #3c3c3a; }
  .slide { min-height: 0; page-break-after: always; padding: 1rem 0; opacity: 1 !important; transform: none !important; }
  pre { background: #f6f5f4; border-color: #ddd; }
  pre code { color: #3c3c3a; }
}