:root {
  --ink: #eef8ff;
  --muted: #a9bed0;
  --bg: #07131f;
  --surface: #0c1d2d;
  --surface-2: #10283c;
  --line: rgba(161, 211, 235, 0.18);
  --cyan: #42d9ff;
  --yellow: #ffdb65;
  --coral: #ff7b72;
  --green: #72e6b1;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.28);
  --radius: 1.25rem;
}

/* Questionnaire et modération : même palette que les ressources pédagogiques. */
.survey-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 1.5rem; margin-top: 2rem; align-items: start; }
.survey-form { display: grid; gap: .75rem; }
.survey-form label { font-weight: 650; }
.survey-form label span, .survey-help { font-size: .9rem; color: var(--muted); font-weight: 400; }
.survey-form input:not([type="checkbox"]), .survey-form textarea, .moderation-controls select { width: 100%; min-width: 0; border: 1px solid var(--line); border-radius: .5rem; padding: .8rem; color: var(--ink); background: var(--bg); font: inherit; }
.survey-form textarea { resize: vertical; }
.survey-form input:focus-visible, .survey-form textarea:focus-visible, .moderation-controls select:focus-visible { outline: 3px solid var(--yellow); outline-offset: 2px; }
.survey-check { display: flex; gap: .65rem; align-items: flex-start; margin: .5rem 0; }
.survey-check input { flex-shrink: 0; width: 1.15rem; height: 1.15rem; margin-top: .3rem; accent-color: var(--cyan); }
.survey-check span { color: var(--ink) !important; }
.survey-form .button { justify-self: start; }
.privacy-notice { padding: 1rem; border: 1px solid var(--line); border-radius: .75rem; background: rgba(66, 217, 255, .05); }
.privacy-notice p { margin: .4rem 0 0; color: var(--muted); font-size: .9rem; }
.survey-trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.survey-success { color: var(--green); }
.survey-error { color: var(--coral); }
.survey-ranking { padding: 0; list-style: none; display: grid; gap: 1rem; max-height: 35rem; overflow-y: auto; }
.survey-ranking li { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .4rem 1rem; }
.survey-ranking strong, .moderation-card p, .moderation-card a { overflow-wrap: anywhere; }
.survey-ranking meter { width: 100%; height: .65rem; grid-column: 1 / -1; accent-color: var(--cyan); }
.button:disabled { opacity: .55; cursor: wait; }
.moderation-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; margin: 1.5rem 0; }
.moderation-controls select { width: auto; }
.moderation-list { display: grid; gap: 1.5rem; }
.moderation-card { padding: 1.5rem; }
.moderation-card blockquote { white-space: pre-wrap; margin: 1rem 0; padding-left: 1rem; border-left: 3px solid var(--line); }
.moderation-card details { margin-top: 1rem; }
.moderation-card summary { cursor: pointer; color: var(--cyan); }
.moderation-card .survey-form { margin-top: 1rem; }
.moderation-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1rem; }
.moderation-empty { padding: 2rem 0; }
@media (max-width: 760px) { .survey-grid { grid-template-columns: 1fr; } }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% -10%, rgba(66, 217, 255, 0.17), transparent 28rem),
    radial-gradient(circle at 100% 28%, rgba(255, 219, 101, 0.08), transparent 30rem),
    var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
}

a { color: inherit; }
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 4px;
}

.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: fixed;
  z-index: 100;
  top: 1rem;
  left: 1rem;
  transform: translateY(-180%);
  padding: .65rem 1rem;
  border-radius: .7rem;
  color: #07131f;
  background: var(--yellow);
  font-weight: 800;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 19, 31, 0.88);
  backdrop-filter: blur(18px);
}

.nav-shell {
  width: min(1180px, calc(100% - 2rem));
  min-height: 4.7rem;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 900;
  letter-spacing: -.035em;
  font-size: 1.15rem;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  border: 1px solid rgba(66, 217, 255, .5);
  border-radius: .7rem;
  color: var(--cyan);
  background: rgba(66, 217, 255, .08);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .84rem;
  box-shadow: inset 0 0 18px rgba(66, 217, 255, .08);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: .25rem;
}

.nav-links a {
  padding: .65rem .78rem;
  border-radius: .7rem;
  color: var(--muted);
  text-decoration: none;
  font-weight: 700;
  font-size: .9rem;
  transition: color .18s ease, background .18s ease;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  background: rgba(255, 255, 255, .07);
}

.menu-button {
  display: none;
  width: 2.8rem;
  height: 2.8rem;
  border: 1px solid var(--line);
  border-radius: .8rem;
  color: var(--ink);
  background: var(--surface);
  font: inherit;
  font-size: 1.3rem;
  cursor: pointer;
}

.page-shell { overflow: hidden; }
.container { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; }

.hero {
  position: relative;
  padding: clamp(4.5rem, 10vw, 8.5rem) 0 4.5rem;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(290px, .8fr);
  gap: clamp(2rem, 6vw, 5.5rem);
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin: 0 0 1.2rem;
  color: var(--cyan);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .84rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.eyebrow::before { content: "//"; color: var(--yellow); }

h1, h2, h3 { margin-top: 0; line-height: 1.08; letter-spacing: -.04em; }
h1 { max-width: 820px; margin-bottom: 1.25rem; font-size: clamp(2.8rem, 7vw, 6.2rem); }
h2 { margin-bottom: 1rem; font-size: clamp(2rem, 4vw, 3.25rem); }
h3 { margin-bottom: .55rem; font-size: 1.22rem; }
.accent { color: var(--cyan); }
.accent-yellow { color: var(--yellow); }

.lead {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.3rem);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  min-height: 3rem;
  padding: .75rem 1.08rem;
  border: 1px solid transparent;
  border-radius: .85rem;
  color: #07131f;
  background: var(--cyan);
  text-decoration: none;
  font-weight: 900;
  box-shadow: 0 10px 26px rgba(66, 217, 255, .16);
  transition: transform .18s ease, box-shadow .18s ease;
}
.button:hover { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(66, 217, 255, .24); }
.button.secondary { color: var(--ink); background: transparent; border-color: var(--line); box-shadow: none; }
.button.youtube { color: white; background: #e53d35; box-shadow: 0 10px 26px rgba(229, 61, 53, .18); }

.code-card {
  position: relative;
  padding: 1rem;
  border: 1px solid rgba(66, 217, 255, .25);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(16, 40, 60, .92), rgba(8, 24, 37, .88));
  box-shadow: var(--shadow);
  transform: rotate(1.5deg);
}
.window-bar { display: flex; gap: .42rem; padding: .1rem .1rem .9rem; }
.window-bar span { width: .68rem; height: .68rem; border-radius: 50%; background: var(--coral); }
.window-bar span:nth-child(2) { background: var(--yellow); }
.window-bar span:nth-child(3) { background: var(--green); }
pre {
  margin: 0;
  overflow-x: auto;
  color: #d7f5ff;
  font: 600 .9rem/1.8 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.code-key { color: var(--coral); }
.code-fn { color: var(--yellow); }
.code-str { color: var(--green); }
.code-comment { color: #7392a8; }

.section { padding: clamp(4rem, 8vw, 7rem) 0; }
.section.alt { border-block: 1px solid var(--line); background: rgba(255, 255, 255, .025); }
.section-heading { max-width: 730px; margin-bottom: 2.3rem; }
.section-heading p { margin: 0; color: var(--muted); font-size: 1.08rem; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.cards.two { grid-template-columns: repeat(2, 1fr); }
.card {
  position: relative;
  min-height: 100%;
  padding: 1.45rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(12, 29, 45, .72);
  box-shadow: 0 12px 35px rgba(0, 0, 0, .13);
}
a.card { text-decoration: none; transition: transform .2s ease, border-color .2s ease, background .2s ease; }
a.card:hover { transform: translateY(-5px); border-color: rgba(66, 217, 255, .58); background: rgba(16, 40, 60, .92); }
.card-index {
  display: inline-block;
  margin-bottom: 1.35rem;
  color: var(--cyan);
  font: 800 .82rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: .08em;
}
.card p { margin: 0; color: var(--muted); }
.card-link { display: inline-block; margin-top: 1.2rem; color: var(--yellow); font-weight: 900; }

.pill-row { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.2rem; }
.pill { padding: .35rem .65rem; border: 1px solid var(--line); border-radius: 999px; color: #c9dce8; font-size: .82rem; font-weight: 700; }

.page-hero { padding: clamp(4rem, 9vw, 7rem) 0 3.5rem; }
.page-hero h1 { max-width: 920px; font-size: clamp(2.7rem, 6vw, 5rem); }
.page-hero .lead { max-width: 800px; }
.breadcrumb { display: flex; gap: .5rem; margin-bottom: 1.2rem; color: var(--muted); font-size: .9rem; }
.breadcrumb a { color: var(--cyan); text-decoration: none; }

.terminal-chapter-section {
  padding: 0 0 clamp(3rem, 6vw, 5rem);
}
.terminal-chapter-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: center;
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid rgba(255, 219, 101, .42);
  border-left: .35rem solid var(--yellow);
  border-radius: var(--radius);
  color: var(--ink);
  background:
    radial-gradient(circle at 88% 20%, rgba(66, 217, 255, .13), transparent 18rem),
    linear-gradient(120deg, rgba(255, 219, 101, .1), rgba(12, 29, 45, .8));
  box-shadow: 0 16px 42px rgba(0, 0, 0, .18);
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.terminal-chapter-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 219, 101, .78);
  box-shadow: 0 22px 52px rgba(0, 0, 0, .25);
}
.terminal-chapter-number {
  display: grid;
  place-items: center;
  width: 5rem;
  min-height: 5rem;
  padding: .55rem;
  border-radius: 1rem;
  color: #07131f;
  background: var(--yellow);
  line-height: 1;
}
.terminal-chapter-number small {
  font: 900 .66rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.terminal-chapter-number strong {
  font-size: 2.3rem;
  letter-spacing: -.06em;
}
.terminal-chapter-copy {
  min-width: 0;
  display: grid;
  gap: .25rem;
}
.terminal-chapter-label {
  color: var(--cyan);
  font: 800 .78rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: .07em;
  text-transform: uppercase;
}
.terminal-chapter-title {
  margin: 0;
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  font-weight: 900;
  letter-spacing: -.04em;
  line-height: 1.12;
}
.terminal-chapter-description {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  font-size: .98rem;
}
.terminal-chapter-action {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  min-height: 3rem;
  padding: .7rem .95rem;
  border: 1px solid rgba(66, 217, 255, .35);
  border-radius: .8rem;
  color: var(--cyan);
  background: rgba(5, 13, 21, .52);
  font-size: .9rem;
  font-weight: 900;
  white-space: nowrap;
}

.chapter-grid { display: grid; grid-template-columns: .72fr 1.28fr; gap: clamp(2rem, 6vw, 5rem); align-items: start; }
.chapter-intro { position: sticky; top: 7rem; }
.chapter-intro p { color: var(--muted); }
.topic-list { display: grid; gap: .8rem; }
.topic {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1rem;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(12, 29, 45, .7);
}
.topic-number {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: .8rem;
  color: #07131f;
  background: var(--cyan);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 900;
}
.topic:nth-child(2n) .topic-number { background: var(--yellow); }
.topic p { margin: 0; color: var(--muted); }

.method-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .8rem; }
.method-step { padding: 1.2rem; border-top: 3px solid var(--cyan); background: rgba(255,255,255,.035); }
.method-step:nth-child(2) { border-color: var(--yellow); }
.method-step:nth-child(3) { border-color: var(--coral); }
.method-step:nth-child(4) { border-color: var(--green); }
.method-step strong { display: block; margin-bottom: .35rem; }
.method-step span { color: var(--muted); font-size: .92rem; }

.callout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
  padding: clamp(1.6rem, 4vw, 2.6rem);
  border: 1px solid rgba(255, 219, 101, .35);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(255, 219, 101, .09), rgba(66, 217, 255, .06));
}
.callout h2 { margin-bottom: .7rem; font-size: clamp(1.75rem, 3vw, 2.5rem); }
.callout p { max-width: 720px; margin: 0; color: var(--muted); }

.history-section {
  background:
    radial-gradient(circle at 88% 20%, rgba(255, 123, 114, .10), transparent 28rem),
    transparent;
}
.history-grid {
  display: grid;
  grid-template-columns: minmax(0, .78fr) minmax(360px, 1.22fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}
.history-copy p:not(.eyebrow) { margin: 0 0 1.6rem; color: var(--muted); font-size: 1.08rem; }
.history-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; }
.inline-link, .channel-link { color: var(--cyan); text-decoration: none; font-weight: 800; }
.video-card {
  overflow: hidden;
  border: 1px solid rgba(255, 219, 101, .3);
  border-radius: var(--radius);
  background: #050d15;
  box-shadow: var(--shadow);
}
.video-label { display: grid; gap: .18rem; padding: 1rem 1.2rem; }
.video-label span { color: var(--yellow); font: 800 .76rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; text-transform: uppercase; letter-spacing: .08em; }
.video-label strong { font-size: 1rem; }
.video-frame { position: relative; aspect-ratio: 16 / 9; background: #000; }
.video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.history-hero { padding-bottom: 3rem; }
.history-feature { padding-top: clamp(2.5rem, 5vw, 4.5rem); }
.history-page-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr); gap: clamp(1.2rem, 4vw, 3rem); align-items: stretch; }
.featured-video { align-self: start; }
.playlist-panel { display: flex; flex-direction: column; align-items: flex-start; padding: clamp(1.4rem, 3vw, 2.2rem); border: 1px solid var(--line); border-radius: var(--radius); background: rgba(12, 29, 45, .72); }
.playlist-panel h2 { margin-bottom: 1rem; font-size: clamp(1.75rem, 3vw, 2.5rem); }
.playlist-panel p { margin: 0 0 1.5rem; color: var(--muted); }
.playlist-panel .channel-link { margin-top: 1rem; font-size: .9rem; }

.news-heading {
  max-width: none;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
}
.news-heading > div { max-width: 760px; }
.auto-update {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  padding: .6rem .8rem;
  border: 1px solid rgba(114, 230, 177, .24);
  border-radius: 999px;
  color: #bfeeda;
  background: rgba(114, 230, 177, .07);
  font-size: .84rem;
  font-weight: 800;
}
.auto-update span { width: .55rem; height: .55rem; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 .25rem rgba(114, 230, 177, .1); }
.bulletin-card {
  overflow: hidden;
  border: 1px solid rgba(66, 217, 255, .24);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(16, 40, 60, .78), rgba(8, 24, 37, .82));
  box-shadow: 0 16px 45px rgba(0, 0, 0, .17);
}
.bulletin-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.35rem 1.5rem;
  border-bottom: 1px solid var(--line);
}
.bulletin-number { display: inline-block; margin-bottom: .45rem; color: var(--cyan); font: 800 .8rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: .08em; text-transform: uppercase; }
.bulletin-header h3 { margin: 0; font-size: clamp(1.35rem, 3vw, 2rem); }
.bulletin-header time { color: var(--muted); font-size: .82rem; white-space: nowrap; }
.bulletin-grid { display: grid; grid-template-columns: 1fr 1fr; }
.bulletin-grid section { padding: 1.5rem; }
.bulletin-grid section + section { border-left: 1px solid var(--line); }
.bulletin-grid p { margin: .9rem 0 0; color: var(--muted); }
.bulletin-grid strong { color: var(--ink); }
.news-list { margin: 1rem 0 0; padding-left: 1.15rem; color: var(--muted); }
.news-list li + li { margin-top: .55rem; }
.news-list strong { color: var(--ink); }
.news-label { display: inline-flex; padding: .32rem .58rem; border-radius: .48rem; font: 800 .76rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; text-transform: uppercase; letter-spacing: .06em; }
.news-label.factual { color: var(--cyan); background: rgba(66, 217, 255, .09); }
.news-label.analysis { color: var(--yellow); background: rgba(255, 219, 101, .09); }
.bulletin-actions { display: grid; grid-template-columns: auto 1fr; gap: .85rem 1.25rem; align-items: start; padding: 1.1rem 1.5rem; border-top: 1px solid var(--line); background: rgba(255, 219, 101, .055); }
.bulletin-actions strong { color: var(--yellow); font: 800 .78rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: .06em; text-transform: uppercase; }
.bulletin-actions span { color: var(--muted); }
.bulletin-footer { display: flex; justify-content: space-between; gap: 1rem; padding: .95rem 1.5rem; border-top: 1px solid var(--line); background: rgba(5, 13, 21, .32); color: var(--muted); font-size: .86rem; }
.bulletin-footer a { color: var(--cyan); text-decoration: none; font-weight: 800; }
.bulletin-source-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: .55rem 1rem; }

.sandbox-page { min-height: calc(100vh - 9rem); }
.sandbox-section { padding: clamp(2.4rem, 5vw, 4.5rem) 0 clamp(4rem, 7vw, 6rem); }
.sandbox-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 2rem;
}
.sandbox-heading h1 { margin-bottom: .75rem; font-size: clamp(2.5rem, 5vw, 4.4rem); }
.sandbox-heading .lead { max-width: 760px; font-size: 1.08rem; }
.runtime-status {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  padding: .65rem .85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(12, 29, 45, .85);
  font-weight: 800;
  font-size: .88rem;
}
.status-dot { width: .65rem; height: .65rem; border-radius: 50%; background: var(--yellow); box-shadow: 0 0 0 .28rem rgba(255, 219, 101, .12); }
.runtime-status.is-loading .status-dot { animation: status-pulse 1.2s ease-in-out infinite; }
.runtime-status.is-ready .status-dot { background: var(--green); box-shadow: 0 0 0 .28rem rgba(114, 230, 177, .12); }
.runtime-status.is-running .status-dot { background: var(--cyan); box-shadow: 0 0 0 .28rem rgba(66, 217, 255, .12); animation: status-pulse .8s ease-in-out infinite; }
.runtime-status.is-error .status-dot { background: var(--coral); box-shadow: 0 0 0 .28rem rgba(255, 123, 114, .12); }
@keyframes status-pulse { 50% { opacity: .35; transform: scale(.8); } }

.sandbox-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(320px, .82fr);
  min-height: 36rem;
  overflow: hidden;
  border: 1px solid rgba(66, 217, 255, .25);
  border-radius: var(--radius);
  background: rgba(5, 13, 21, .85);
  box-shadow: var(--shadow);
}
.editor-panel, .output-panel { min-width: 0; display: flex; flex-direction: column; }
.editor-panel { border-right: 1px solid var(--line); }
.panel-bar {
  min-height: 5.1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(16, 40, 60, .72);
}
.panel-bar h2 { margin: .12rem 0 0; font: 800 1rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: 0; }
.panel-kicker { color: var(--cyan); font: 800 .7rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; text-transform: uppercase; letter-spacing: .08em; }
.example-picker { display: flex; align-items: center; gap: .55rem; color: var(--muted); font-size: .84rem; font-weight: 800; }
.example-picker select {
  max-width: 12rem;
  min-height: 2.6rem;
  padding: .45rem 2.1rem .45rem .7rem;
  border: 1px solid var(--line);
  border-radius: .65rem;
  color: var(--ink);
  background: #0a1927;
  font: inherit;
}
.code-editor {
  flex: 1;
  width: 100%;
  min-height: 27rem;
  resize: vertical;
  padding: 1.25rem;
  border: 0;
  border-radius: 0;
  outline: none;
  color: #ddf7ff;
  background: #07131f;
  caret-color: var(--yellow);
  tab-size: 4;
  font: 600 1rem/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.code-editor:focus { box-shadow: inset 0 0 0 3px rgba(66, 217, 255, .35); }
.editor-actions { display: flex; flex-wrap: wrap; align-items: center; gap: .7rem; padding: .9rem 1rem; border-top: 1px solid var(--line); background: rgba(12, 29, 45, .72); }
.editor-actions .button { min-height: 2.65rem; padding: .58rem .9rem; border: 0; font-size: .9rem; cursor: pointer; }
.editor-actions .button:disabled { opacity: .45; cursor: not-allowed; transform: none; box-shadow: none; }
.danger-button { color: #07131f; background: var(--coral); box-shadow: 0 10px 26px rgba(255, 123, 114, .14); }
.shortcut { margin-left: auto; color: var(--muted); font-size: .78rem; }
.output-panel { background: #050d15; }
.output-bar { background: rgba(9, 24, 39, .88); }
.text-button {
  min-height: 2.5rem;
  padding: .4rem .7rem;
  border: 1px solid var(--line);
  border-radius: .65rem;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-size: .82rem;
  font-weight: 800;
  cursor: pointer;
}
.text-button:hover { color: var(--ink); border-color: rgba(66, 217, 255, .5); }
.console-output {
  flex: 1;
  min-height: 31rem;
  max-height: 42rem;
  overflow: auto;
  padding: 1.25rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-size: .93rem;
  line-height: 1.65;
}
.console-muted { color: #6f899c; font-weight: 500; }
.console-error { color: #ff9d96; }
.console-result { color: var(--yellow); }
.console-warning { color: var(--yellow); }
.sandbox-notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: .8rem; margin-top: 1rem; }
.sandbox-notes div { display: grid; gap: .15rem; padding: 1rem; border: 1px solid var(--line); border-radius: .85rem; background: rgba(255,255,255,.025); }
.sandbox-notes strong { color: var(--cyan); }
.sandbox-notes span { color: var(--muted); font-size: .88rem; }
.privacy-note { margin: 1rem 0 0; color: var(--muted); font-size: .84rem; }

.chooser-hero { padding-bottom: 2.4rem; }
.chooser-section { padding-top: 1.4rem; }
.sandbox-choice-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.sandbox-choice {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  align-items: center;
  min-height: 18rem;
  padding: clamp(1.5rem, 4vw, 2.4rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(16, 40, 60, .82), rgba(8, 24, 37, .82));
  text-decoration: none;
  box-shadow: 0 16px 45px rgba(0, 0, 0, .16);
  transition: transform .2s ease, border-color .2s ease;
}
.sandbox-choice:hover { transform: translateY(-5px); border-color: rgba(66, 217, 255, .58); }
.sandbox-choice h2 { margin-bottom: .65rem; }
.sandbox-choice p { margin: 0; color: var(--muted); }
.choice-language { display: grid; place-items: center; width: 6rem; aspect-ratio: 1; border-radius: 1.35rem; color: #07131f; font: 900 1.35rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.python-choice { background: var(--cyan); }
.sql-choice { background: var(--yellow); }

.sql-sandbox-section { padding-bottom: 5rem; }
.dataset-notice { display: flex; gap: .7rem 1rem; align-items: baseline; margin: -1rem 0 1rem; padding: .8rem 1rem; border: 1px solid rgba(255, 219, 101, .25); border-radius: .8rem; color: var(--muted); background: rgba(255, 219, 101, .06); font-size: .88rem; }
.dataset-notice strong { flex: 0 0 auto; color: var(--yellow); }
.sql-workspace { grid-template-columns: minmax(0, .92fr) minmax(380px, 1.08fr); }
.sql-editor { min-height: 30rem; }
.sql-output { flex: 1; min-height: 34.4rem; max-height: 46rem; overflow: auto; padding: 1rem; }
.sql-output > p { margin: .25rem; }
.result-table-wrapper { width: 100%; overflow: auto; border: 1px solid var(--line); border-radius: .75rem; }
.result-table { width: 100%; border-collapse: collapse; color: var(--ink); font-size: .84rem; white-space: nowrap; }
.result-table th, .result-table td { padding: .65rem .75rem; border-bottom: 1px solid var(--line); text-align: left; }
.result-table th { position: sticky; top: 0; color: var(--cyan); background: #10283c; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.result-table tr:last-child td { border-bottom: 0; }
.result-table tbody tr:nth-child(even) { background: rgba(255, 255, 255, .025); }
.null-value { color: #7890a1; font-style: italic; }
.result-count { margin: .7rem .2rem 0; color: var(--muted); font-size: .8rem; }
.schema-section { padding-top: clamp(3rem, 7vw, 5.5rem); }
.schema-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.schema-card { padding: 1.25rem; border: 1px solid var(--line); border-radius: 1rem; background: rgba(12, 29, 45, .7); }
.schema-card-wide { grid-column: 1 / -1; }
.schema-card h3 { color: var(--yellow); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: 0; }
.schema-card > p { margin: 0 0 1rem; color: var(--muted); font-size: .9rem; }
.schema-card dl { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .4rem .8rem; margin: 0; }
.schema-card-wide dl { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.schema-card dl div { min-width: 0; padding: .62rem .7rem; border-radius: .6rem; background: rgba(5, 13, 21, .55); }
.schema-card dt { overflow-wrap: anywhere; color: var(--ink); font: 700 .84rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.schema-card dd { margin: .15rem 0 0; color: var(--muted); font-size: .74rem; }
.relation-summary { display: flex; flex-wrap: wrap; gap: .65rem; align-items: center; margin-top: 1rem; padding: 1rem; border-left: 3px solid var(--cyan); background: rgba(66, 217, 255, .045); }
.relation-summary strong { margin-right: .35rem; }
.relation-summary span { padding: .35rem .65rem; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font: 700 .8rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.author-hero {
  background:
    radial-gradient(circle at 78% 22%, rgba(66, 217, 255, .13), transparent 24rem),
    radial-gradient(circle at 92% 74%, rgba(255, 219, 101, .08), transparent 22rem);
}
.author-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(310px, .88fr);
  gap: clamp(2rem, 7vw, 6rem);
  align-items: center;
}
.profile-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.2rem;
  padding: clamp(1.35rem, 4vw, 2rem);
  border: 1px solid rgba(66, 217, 255, .28);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(16, 40, 60, .9), rgba(8, 24, 37, .88));
  box-shadow: var(--shadow);
}
.profile-photo-frame {
  display: block;
  width: 4.5rem;
  height: 4.5rem;
  overflow: hidden;
  border-radius: 1.1rem;
  border: 2px solid rgba(255, 219, 101, .78);
  background: #d8d2c8;
  box-shadow: 0 8px 22px rgba(0, 0, 0, .28);
}
.profile-photo {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 43% 25%;
  transform: scale(2.15);
  transform-origin: 43% 25%;
}
.profile-label { margin: 0 0 .65rem; color: var(--cyan); font: 800 .78rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: .08em; text-transform: uppercase; }
.profile-list { display: grid; gap: .55rem; margin: 0; padding-left: 1.15rem; color: var(--muted); }
.profile-list li::marker { color: var(--cyan); }
.author-about-grid { display: grid; grid-template-columns: minmax(0, .7fr) minmax(0, 1.3fr); gap: clamp(2rem, 7vw, 6rem); align-items: start; }
.author-about-grid .section-heading { margin-bottom: 0; }
.author-copy { max-width: 760px; }
.author-copy p { margin: 0 0 1.15rem; color: var(--muted); font-size: 1.06rem; }
.books-section { background: radial-gradient(circle at 8% 65%, rgba(255, 123, 114, .07), transparent 30rem); }
.featured-book {
  display: grid;
  grid-template-columns: minmax(9rem, 13rem) 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
  padding: clamp(1.5rem, 4vw, 2.6rem);
  border: 1px solid rgba(255, 219, 101, .34);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(255, 219, 101, .085), rgba(66, 217, 255, .055));
  box-shadow: 0 16px 45px rgba(0, 0, 0, .16);
}
.book-cover-link { display: block; width: 100%; color: inherit; text-decoration: none; }
.cover-credit { display: block; margin-top: .65rem; color: var(--muted); font-size: .75rem; text-align: center; }
.book-cover {
  display: block;
  width: min(100%, 12rem);
  height: auto;
  aspect-ratio: 3 / 4;
  margin: 0 auto 1.25rem;
  border-radius: .45rem;
  object-fit: contain;
  background: #fff;
  box-shadow: 0 14px 30px rgba(0, 0, 0, .34);
}
.book-cover-featured { width: 100%; margin: 0; transition: transform .2s ease, box-shadow .2s ease; }
.book-cover-link:hover .book-cover { transform: translateY(-3px); box-shadow: 0 18px 34px rgba(0, 0, 0, .4); }
.book-meta { display: inline-block; margin-bottom: .8rem; color: var(--cyan); font: 800 .78rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: .07em; text-transform: uppercase; }
.featured-book h3 { font-size: clamp(1.7rem, 3vw, 2.5rem); }
.featured-book p, .book-card p { color: var(--muted); }
.book-links { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.4rem; }
.books-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 1rem; }
.book-card { display: flex; flex-direction: column; align-items: stretch; padding: 1.4rem; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(12, 29, 45, .72); }
.book-card-body { display: flex; flex: 1; flex-direction: column; align-items: flex-start; }
.book-card p { flex: 1; margin: 0; }
.book-card .book-cover { transition: transform .2s ease, box-shadow .2s ease; }
.book-card .cover-credit { margin-top: -.65rem; margin-bottom: 1rem; }
.school-book-card { border-color: rgba(66, 217, 255, .28); }
.publication-year-block { margin-top: clamp(2.8rem, 6vw, 5rem); }
.publication-year-heading { display: flex; align-items: baseline; gap: 1rem; padding-bottom: .75rem; border-bottom: 1px solid var(--line); }
.publication-year-heading h3 { margin: 0; color: var(--yellow); font: 900 clamp(1.8rem, 4vw, 3rem) ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: -.06em; }
.publication-year-heading span { color: var(--cyan); font: 800 .76rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: .09em; text-transform: uppercase; }
.book-cover-placeholder { display: grid; align-content: center; justify-items: center; gap: .5rem; min-height: 15.5rem; padding: 1.2rem; color: #08243a; background: linear-gradient(150deg, #72e6b1, #42d9ff 62%, #ffdb65); text-align: center; }
.book-cover-placeholder strong { font-size: 1.55rem; letter-spacing: -.05em; }
.book-cover-placeholder b { font-size: 4rem; line-height: .8; }
.book-cover-placeholder small { font: 800 .78rem/1.45 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: .04em; text-transform: uppercase; }
.sesamath-card { border-color: rgba(114, 230, 177, .34); }
.sesamath-strip { margin-top: 1rem; }
.school-featured-book { border-color: rgba(66, 217, 255, .36); background: linear-gradient(120deg, rgba(66, 217, 255, .09), rgba(255, 219, 101, .055)); }
.publication-group-heading { margin-top: clamp(3rem, 6vw, 5rem); }
.publication-group-heading .eyebrow { margin-bottom: .55rem; }
.publication-group-heading h3 { margin: 0; font-size: clamp(1.65rem, 3vw, 2.35rem); }
.coauthor-strip { display: flex; flex-wrap: wrap; align-items: center; gap: .85rem 1rem; margin-top: 1rem; padding: 1.2rem 1.35rem; border: 1px solid var(--line); border-radius: 1rem; background: rgba(255, 255, 255, .025); }
.coauthor-strip div { display: grid; margin-right: auto; }
.coauthor-strip strong { color: var(--ink); }
.coauthor-strip span { color: var(--muted); font-size: .9rem; }
.coauthor-strip a { padding: .45rem .72rem; border: 1px solid rgba(255, 219, 101, .25); border-radius: 999px; color: var(--yellow); text-decoration: none; font-weight: 800; }
.secondary-publication-heading { margin-top: clamp(4rem, 8vw, 7rem); }
.compact-links { display: flex; gap: .6rem; margin-top: 1.2rem; }
.compact-links a { padding: .35rem .7rem; border: 1px solid var(--line); border-radius: 999px; color: var(--yellow); text-decoration: none; font-weight: 800; }
.bibliography-links { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1rem; margin-top: 1.6rem; padding-top: 1.4rem; border-top: 1px solid var(--line); }
.bibliography-links p { margin: 0; color: var(--muted); }
.bibliography-links a { color: var(--cyan); text-decoration: none; font-weight: 800; }

.site-footer { padding: 2.4rem 0; border-top: 1px solid var(--line); color: var(--muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 1.5rem; align-items: center; }
.footer-inner p { margin: 0; }
.footer-inner a { color: var(--cyan); text-decoration: none; font-weight: 800; }

@media (max-width: 1100px) {
  .menu-button { display: grid; place-items: center; }
  .nav-shell { position: relative; }
  .nav-links {
    display: none;
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    padding: .75rem;
    border: 1px solid var(--line);
    border-top: 0;
    border-radius: 0 0 1rem 1rem;
    background: #091827;
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: grid; }
  .nav-links a { padding: .85rem 1rem; }
  .hero-grid, .chapter-grid { grid-template-columns: 1fr; }
  .history-grid, .sandbox-workspace, .sql-workspace { grid-template-columns: 1fr; }
  .author-hero-grid, .author-about-grid { grid-template-columns: 1fr; }
  .history-page-grid { grid-template-columns: 1fr; }
  .bulletin-grid { grid-template-columns: 1fr; }
  .bulletin-grid section + section { border-left: 0; border-top: 1px solid var(--line); }
  .editor-panel { border-right: 0; border-bottom: 1px solid var(--line); }
  .chapter-intro { position: static; }
  .cards, .method-grid { grid-template-columns: repeat(2, 1fr); }
  .books-grid { grid-template-columns: repeat(2, 1fr); }
  .terminal-chapter-card { grid-template-columns: auto minmax(0, 1fr); }
  .terminal-chapter-action { grid-column: 2; justify-self: start; }
}

@media (max-width: 560px) {
  .container, .nav-shell { width: min(100% - 1.2rem, 1120px); }
  .hero { padding-top: 3.3rem; }
  .hero-grid { gap: 2.5rem; }
  .cards, .cards.two, .method-grid { grid-template-columns: 1fr; }
  .code-card { transform: none; }
  .callout { grid-template-columns: 1fr; }
  .callout .button { width: 100%; }
  .history-grid { grid-template-columns: 1fr; }
  .sandbox-heading { align-items: flex-start; flex-direction: column; gap: 1rem; }
  .news-heading, .bulletin-header { align-items: flex-start; flex-direction: column; gap: 1rem; }
  .bulletin-header time { white-space: normal; }
  .bulletin-footer { flex-direction: column; }
  .bulletin-source-links { justify-content: flex-start; }
  .bulletin-actions { grid-template-columns: 1fr; }
  .panel-bar { align-items: flex-start; flex-direction: column; }
  .example-picker { width: 100%; align-items: flex-start; flex-direction: column; }
  .example-picker select { width: 100%; max-width: none; }
  .shortcut { width: 100%; margin-left: 0; }
  .sandbox-notes { grid-template-columns: 1fr; }
  .sandbox-choice-grid, .schema-grid { grid-template-columns: 1fr; }
  .sandbox-choice { grid-template-columns: 1fr; min-height: 0; }
  .choice-language { width: 4.7rem; }
  .dataset-notice { align-items: flex-start; flex-direction: column; }
  .schema-card-wide { grid-column: auto; }
  .schema-card dl, .schema-card-wide dl { grid-template-columns: 1fr; }
  .profile-card, .featured-book { grid-template-columns: 1fr; }
  .profile-photo-frame { width: 3.8rem; height: 3.8rem; }
  .book-cover-featured { width: min(100%, 12rem); margin: 0; }
  .books-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .topic { grid-template-columns: 2.5rem 1fr; }
  .topic-number { width: 2.5rem; height: 2.5rem; }
  .terminal-chapter-card { grid-template-columns: 1fr; }
  .terminal-chapter-number { width: 4.25rem; min-height: 4.25rem; }
  .terminal-chapter-number strong { font-size: 1.9rem; }
  .terminal-chapter-action { grid-column: 1; width: 100%; justify-content: center; white-space: normal; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}