/* learn.curiosta.com — shared Curiosta brand tokens + chrome */
:root {
  --ink: #0b1f2e;
  --ink-2: #2d4354;
  --muted: #5d7180;
  --sea-900: #041726;
  --sea-800: #06243a;
  --sea-700: #0a3554;
  --sea-500: #0f6e8c;
  --teal: #11b5a4;
  --teal-soft: #d8f3ef;
  --coral: #ff6b4a;
  --coral-soft: #ffe7e0;
  --sand: #f7f4ee;
  --card: #ffffff;
  --line: #e4e0d6;
  --ok: #14866d;
  --bad: #c2412d;
  --radius: 16px;
  --nav-h: 60px;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --shadow: 0 1px 2px rgba(4, 23, 38, 0.06), 0 8px 24px rgba(4, 23, 38, 0.06);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--sand);
  line-height: 1.62;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--sea-500);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--coral);
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.narrow {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Sticky dark nav */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(4, 23, 38, 0.92);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.topbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: var(--nav-h);
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
  font: 800 1.2rem / 1 var(--sans);
  letter-spacing: -0.03em;
}

.wordmark:hover {
  color: #fff;
}

.wordmark svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.wordmark b {
  color: var(--teal);
  font-weight: 800;
}

.sectionnav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  font: 500 0.88rem var(--sans);
}

.sectionnav a {
  color: #c7dbe6;
  text-decoration: none;
  padding: 7px 12px;
  border-radius: 999px;
}

.sectionnav a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.sectionnav a[aria-current="page"] {
  color: var(--sea-900);
  background: var(--teal);
}

/* Dark hero */
.hero {
  padding: 72px 0 56px;
  background:
    radial-gradient(1200px 500px at 80% -10%, #0f6e8c 0%, transparent 60%),
    radial-gradient(800px 400px at 10% 110%, rgba(255, 107, 74, 0.18) 0%, transparent 55%),
    linear-gradient(180deg, var(--sea-800), var(--sea-900));
  color: #eaf4f8;
}

.hero .eyebrow,
.eyebrow {
  display: inline-block;
  font: 600 0.78rem / 1.3 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 0.85rem;
}

.hero h1 {
  font: 600 clamp(2rem, 4.5vw, 3.3rem) / 1.12 var(--serif);
  margin: 0 0 0.85rem;
  max-width: 22ch;
  color: #fff;
  letter-spacing: -0.01em;
}

.hero .lede {
  font-size: 1.12rem;
  color: #bcd3df;
  max-width: 52ch;
  margin: 0 0 1.4rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 13px 22px;
  border-radius: 999px;
  font: 600 1rem var(--sans);
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s, background 0.2s;
}

.btn-primary {
  background: var(--coral);
  color: #fff;
  box-shadow: 0 6px 20px rgba(255, 107, 74, 0.35);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-1px);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-ghost:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
}

.note {
  font-size: 0.92rem;
  color: #9dbccb;
  margin-top: 1.1rem;
  max-width: 60ch;
}

/* Sections */
.block {
  padding: 84px 0;
}

.block.compact {
  padding: 56px 0;
}

.block.alt {
  background: var(--card);
}

.block.dark {
  background: var(--sea-900);
  color: #eaf4f8;
}

.section-head {
  max-width: 760px;
  margin: 0 0 1.6rem;
}

.section-head h2 {
  font: 600 clamp(1.9rem, 3vw, 2.7rem) / 1.2 var(--serif);
  margin: 0 0 0.6rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.3rem;
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
  display: block;
  transition: transform 0.15s, border-color 0.15s;
}

a.card:hover {
  transform: translateY(-2px);
  border-color: var(--teal);
  color: inherit;
}

.card .num {
  display: inline-block;
  font: 700 0.72rem / 1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sea-500);
  margin: 0 0 0.55rem;
}

.card h3 {
  margin: 0 0 0.45rem;
  font: 600 clamp(1.15rem, 2vw, 1.35rem) / 1.25 var(--serif);
  color: var(--ink);
}

.card p {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.95rem;
}

/* Theme list (numbered curriculum) */
.themes {
  display: grid;
  gap: 14px;
}

.theme {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem 1.2rem;
  align-items: start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.35rem;
  box-shadow: var(--shadow);
}

.theme .n {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 999px;
  background: var(--teal-soft);
  color: var(--sea-700);
  font: 700 0.85rem / 1 var(--mono);
  flex-shrink: 0;
}

.theme h3 {
  margin: 0.15rem 0 0.4rem;
  font: 600 1.2rem / 1.25 var(--serif);
  color: var(--ink);
}

.theme p {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.98rem;
}

/* Page hero (inner) */
.page-hero {
  padding: 56px 0 48px;
  background:
    radial-gradient(1000px 420px at 85% -15%, #0f6e8c 0%, transparent 55%),
    linear-gradient(180deg, var(--sea-800), var(--sea-900));
  color: #eaf4f8;
}

.page-hero h1 {
  font: 600 clamp(2rem, 4vw, 3.1rem) / 1.15 var(--serif);
  margin: 0 0 0.85rem;
  max-width: 20ch;
  color: #fff;
  letter-spacing: -0.01em;
}

.page-hero .lede {
  font-size: 1.1rem;
  color: #bcd3df;
  max-width: 54ch;
  margin: 0;
}

/* Footer */
.footer {
  margin-top: 0;
  padding: 2.4rem 0 2.8rem;
  background: var(--sea-900);
  color: #9dbccb;
  font-size: 0.9rem;
}

.footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem 2rem;
  justify-content: space-between;
  align-items: flex-start;
}

.footer a {
  color: #c7dbe6;
  text-decoration: none;
}

.footer a:hover {
  color: var(--teal);
}

.footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.1rem;
}

.footer .draft {
  display: block;
  margin-top: 0.45rem;
  font: 600 0.72rem / 1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #7a9aab;
}

.siblings {
  margin: 0.55rem 0 0;
  font-size: 0.88rem;
  color: #8fb3c6;
}

.siblings a {
  font-weight: 600;
}

/* Misc */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 900px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .block {
    padding: 56px 0;
  }

  .hero,
  .page-hero {
    padding: 48px 0 40px;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .sectionnav {
    display: none;
  }

  .theme {
    grid-template-columns: 1fr;
    gap: 0.65rem;
  }
}

/* ---------- Lesson pages (CDS + Socratic) ---------- */
.crumbs {
  font: 500 0.82rem / 1.4 var(--mono);
  letter-spacing: 0.04em;
  color: #9dbccb;
  margin: 0 0 1rem;
}

.crumbs a {
  color: #c7dbe6;
  text-decoration: none;
}

.crumbs a:hover {
  color: var(--teal);
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.lesson-meta li {
  font: 600 0.74rem / 1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #c7dbe6;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  padding: 7px 12px;
}

.lesson {
  padding: 56px 0 72px;
}

.lesson section {
  margin: 0 0 3rem;
  scroll-margin-top: calc(var(--nav-h) + 16px);
}

.lesson h2 {
  font: 600 clamp(1.6rem, 2.6vw, 2.1rem) / 1.2 var(--serif);
  margin: 0 0 0.8rem;
  letter-spacing: -0.01em;
}

.lesson h3 {
  font: 600 1.2rem / 1.3 var(--serif);
  margin: 1.6rem 0 0.5rem;
}

.lesson p,
.lesson li {
  color: var(--ink-2);
}

.lesson .stage {
  display: inline-block;
  font: 700 0.72rem / 1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sea-500);
  margin: 0 0 0.6rem;
}

.toc {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.3rem;
  box-shadow: var(--shadow);
  margin: 0 0 3rem;
}

.toc strong {
  font: 700 0.74rem / 1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.toc ol {
  margin: 0.7rem 0 0;
  padding-left: 1.3rem;
  columns: 2;
  column-gap: 2rem;
}

.toc li {
  margin: 0 0 0.25rem;
  font-size: 0.95rem;
}

.obs {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
  box-shadow: var(--shadow);
  margin: 1rem 0;
}

.obs > :first-child {
  margin-top: 0;
}

.obs > :last-child {
  margin-bottom: 0;
}

.pause {
  border-left: 4px solid var(--coral);
  background: var(--coral-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.25rem;
  margin: 1.2rem 0;
}

.pause .label,
.deduce .label,
.occam .label {
  display: block;
  font: 700 0.72rem / 1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 0.6rem;
}

.pause .label {
  color: var(--bad);
}

.pause ol {
  margin: 0;
  padding-left: 1.3rem;
}

.pause li {
  margin: 0 0 0.35rem;
  color: var(--ink);
}

.deduce {
  border-left: 4px solid var(--teal);
  background: var(--teal-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.25rem;
  margin: 1.2rem 0;
}

.deduce .label {
  color: var(--sea-700);
}

.deduce > :last-child {
  margin-bottom: 0;
}

details.reveal {
  background: var(--card);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 0.85rem 1.2rem;
  margin: 1rem 0;
}

details.reveal summary {
  cursor: pointer;
  font: 600 0.92rem var(--sans);
  color: var(--sea-500);
}

details.reveal[open] summary {
  margin-bottom: 0.6rem;
}

details.reveal > :last-child {
  margin-bottom: 0;
}

.occam {
  background: var(--sea-900);
  color: #dbe9f0;
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  margin: 1.2rem 0;
}

.occam .label {
  color: var(--teal);
}

.occam p,
.occam li {
  color: #c7dbe6;
}

.occam strong {
  color: #fff;
}

.model-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  font-size: 0.95rem;
  margin: 1rem 0;
}

.model-table th,
.model-table td {
  text-align: left;
  vertical-align: top;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
}

.model-table th {
  font: 700 0.74rem / 1.3 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sea-700);
  background: var(--sand);
}

.model-table tr:last-child td {
  border-bottom: 0;
}

.attrib {
  font-size: 0.9rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 1.2rem;
  margin-top: 2.4rem;
}

.lesson-pager {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem;
  margin-top: 2rem;
}

.btn-quiet {
  background: var(--card);
  color: var(--sea-700);
  border-color: var(--line);
}

.btn-quiet:hover {
  color: var(--coral);
  border-color: var(--coral);
}

.theme .theme-link {
  display: inline-block;
  margin-top: 0.6rem;
  font: 600 0.9rem var(--sans);
}

@media (max-width: 640px) {
  .toc ol {
    columns: 1;
  }

  .model-table th,
  .model-table td {
    padding: 0.65rem 0.7rem;
  }
}

/* ---------- Skills & resources (site layer) ---------- */
.resource-list {
  display: grid;
  gap: 16px;
  max-width: 860px;
}

.card.resource .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.9rem 0 0;
}

.tag {
  display: inline-block;
  font: 600 0.72rem / 1.2 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sea-700);
  background: var(--teal-soft);
  border-radius: 999px;
  padding: 6px 10px;
}

.card.resource .more {
  display: inline-block;
  margin-top: 0.9rem;
  font: 600 0.92rem var(--sans);
  color: var(--sea-500);
}

a.card.resource:hover .more {
  color: var(--coral);
}

.go-further {
  margin: 1.6rem 0 0;
  font-size: 0.95rem;
  color: var(--ink-2);
}

.go-further strong {
  font: 700 0.72rem / 1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sea-500);
  margin-right: 0.4rem;
}

.principles {
  columns: 3;
  column-gap: 1.6rem;
  margin: 0.4rem 0 0;
  padding-left: 2.1rem;
  font-size: 0.93rem;
}

.principles li {
  break-inside: avoid;
  margin: 0 0 0.2rem;
}

@media (max-width: 760px) {
  .principles {
    columns: 2;
  }
}

@media (max-width: 420px) {
  .principles {
    columns: 1;
  }
}

/* ---------- Control map (site layer) ---------- */
.cm-map .cm-intro {
  max-width: 740px;
  margin: 0 auto 2rem;
}

.cm-row {
  margin: 0 0 2.8rem;
  scroll-margin-top: calc(var(--nav-h) + 16px);
}

.lesson .cm-row h3 {
  font: 600 clamp(1.4rem, 2.4vw, 1.75rem) / 1.2 var(--serif);
  margin: 0 0 0.35rem;
}

.lesson .cm-gloss {
  margin: 0 0 0.35rem;
  max-width: 72ch;
}

.lesson .cm-themes {
  margin: 0 0 1rem;
  font: 600 0.8rem / 1.5 var(--mono);
  letter-spacing: 0.04em;
  color: var(--muted);
}

.cm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
  gap: 14px;
}

.cm-cell {
  min-width: 0;
  overflow-wrap: break-word;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
  font-size: 0.92rem;
  line-height: 1.5;
}

.cm-cell.cm-weak {
  background: transparent;
  border-style: dashed;
  box-shadow: none;
  align-self: start;
}

.lesson .cm-obj {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0 0 0.6rem;
  font: 700 0.74rem / 1.3 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sea-700);
}

.cm-fit {
  font: 700 0.66rem / 1 var(--mono);
  letter-spacing: 0.06em;
  color: var(--bad);
  background: var(--coral-soft);
  border-radius: 999px;
  padding: 4px 8px;
}

.cm-ladder {
  list-style: none;
  margin: 0 0 0.7rem;
  padding: 0;
  border-left: 2px solid var(--teal-soft);
}

.lesson .cm-ladder li {
  margin: 0;
  padding: 0 0 0.5rem 0.8rem;
}

.cm-ladder li b,
.cm-floor strong,
.cm-q strong {
  display: block;
  font: 700 0.66rem / 1.3 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sea-500);
  margin: 0 0 0.1rem;
}

.cm-floor strong,
.cm-q strong {
  color: var(--ink);
}

.lesson .cm-floor,
.lesson .cm-q,
.lesson .cm-note {
  margin: 0 0 0.55rem;
}

.lesson .cm-floor {
  border-top: 1px solid var(--line);
  padding-top: 0.6rem;
}

.cm-cell > :last-child {
  margin-bottom: 0;
}

.cm-record {
  margin: 14px 0 0;
  background: var(--sea-900);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

.cm-record .label {
  display: block;
  font: 700 0.72rem / 1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 0.6rem;
}

.cm-record ul {
  margin: 0;
  padding-left: 1.2rem;
}

.lesson .cm-record li {
  color: #c7dbe6;
  font-size: 0.93rem;
  margin: 0 0 0.35rem;
}

.cm-record strong {
  color: #fff;
}

/* ---------- On this day (site layer) ---------- */
:root {
  --otd-convert: var(--coral);
  --otd-move: var(--sea-500);
  --otd-contain: var(--teal);
  --otd-regulate: #b7791f;
  --otd-direct: #6b4fbb;
}
.otd-today {
  margin: 1.3rem 0 0;
  max-width: 62ch;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  padding: 0.85rem 1.1rem;
  color: #dbe9f0;
  font-size: 0.98rem;
}
.otd-today strong { color: #fff; }
.otd-today .lbl {
  display: block;
  font: 700 0.72rem / 1.2 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 0.3rem;
}
.otd-today a { color: #c7dbe6; }
.otd-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.4rem;
  align-items: center;
  justify-content: space-between;
  margin: 0 0 1.2rem;
}
.otd-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.otd-legend li, .otd-legend button {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font: 600 0.8rem / 1.2 var(--sans);
  color: var(--ink-2);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px 6px 9px;
}
.otd-legend button { cursor: pointer; }
.otd-legend button[aria-pressed="false"] { opacity: 0.45; text-decoration: line-through; }
.otd-legend button:focus-visible, .otd-actions button:focus-visible, .mcard summary:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 2px;
}
.dot { width: 10px; height: 10px; border-radius: 999px; background: var(--muted); flex-shrink: 0; }
.dot.v-convert, .mc-bar .v-convert { background: var(--otd-convert); }
.dot.v-move, .mc-bar .v-move { background: var(--otd-move); }
.dot.v-contain, .mc-bar .v-contain { background: var(--otd-contain); }
.dot.v-regulate, .mc-bar .v-regulate { background: var(--otd-regulate); }
.dot.v-direct, .mc-bar .v-direct { background: var(--otd-direct); }
.otd-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.otd-actions button {
  font: 600 0.85rem var(--sans);
  color: var(--sea-700);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 14px;
  cursor: pointer;
}
.otd-actions button:hover { color: var(--coral); border-color: var(--coral); }
.otd-monthnav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 1.4rem;
}
.otd-monthnav a {
  font: 600 0.78rem / 1 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sea-700);
  text-decoration: none;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 11px;
}
.otd-monthnav a:hover { border-color: var(--teal); color: var(--sea-900); }
.otd-monthnav a.is-now { background: var(--coral); border-color: var(--coral); color: #fff; }
.otd-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  align-items: start;
}
/* An open card takes the full row; collapsed months stay compact tiles. */
.otd-grid > .mcard[open] { grid-column: 1 / -1; }
.mcard {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  scroll-margin-top: calc(var(--nav-h) + 14px);
  transition: border-color 0.2s, box-shadow 0.2s;
  min-width: 0;
}
.mcard summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  gap: 0.35rem;
  padding: 1.1rem 1.2rem 1rem;
  border-radius: var(--radius);
  position: relative;
}
.mcard summary::-webkit-details-marker { display: none; }
.mcard summary:hover { background: #fcfbf8; }
.mcard[open] summary { border-bottom: 1px dashed var(--line); border-radius: var(--radius) var(--radius) 0 0; }
.mc-top { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; }
.mc-num { font: 700 0.78rem / 1 var(--mono); letter-spacing: 0.14em; color: var(--sea-500); }
.mc-badge {
  font: 700 0.68rem / 1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #fff;
  background: var(--coral);
  border-radius: 999px;
  padding: 5px 9px;
}
.mc-name { font: 600 clamp(1.6rem, 2.6vw, 2.1rem) / 1.1 var(--serif); color: var(--ink); letter-spacing: -0.01em; }
.mc-meta { font: 500 0.78rem / 1.3 var(--mono); color: var(--muted); }
.mc-bar { display: flex; height: 6px; border-radius: 999px; overflow: hidden; gap: 2px; margin-top: 0.2rem; }
.mc-bar i { display: block; min-width: 4px; }
.mc-flip { font: 600 0.82rem var(--sans); color: var(--sea-500); margin-top: 0.15rem; }
.mc-flip::after { content: " ↓"; }
.mcard[open] .mc-flip::after { content: " ↑"; }
.mcard .when-open, .mcard[open] .when-closed { display: none; }
.mcard[open] .when-open { display: inline; }
.mcard.is-now { border-color: var(--coral); box-shadow: 0 0 0 2px var(--coral), var(--shadow); }
.otd-list { list-style: none; margin: 0; padding: 0.4rem 0.9rem 0.9rem; display: grid; gap: 0; }
.otd-ev {
  display: grid;
  grid-template-columns: 4.6rem minmax(0, 1fr);
  gap: 0.2rem 0.75rem;
  padding: 0.75rem 0.3rem 0.75rem 0.55rem;
  border-left: 4px solid var(--muted);
  border-bottom: 1px solid var(--line);
}
.otd-ev:last-child { border-bottom: 0; }
.otd-ev.v-convert { border-left-color: var(--otd-convert); }
.otd-ev.v-move { border-left-color: var(--otd-move); }
.otd-ev.v-contain { border-left-color: var(--otd-contain); }
.otd-ev.v-regulate { border-left-color: var(--otd-regulate); }
.otd-ev.v-direct { border-left-color: var(--otd-direct); }
.otd-ev time { display: flex; flex-direction: column; font: 700 0.82rem / 1.25 var(--mono); color: var(--sea-700); }
.otd-ev time .yy { font-weight: 500; color: var(--muted); }
.otd-ev h4 { margin: 0 0 0.2rem; font: 700 0.98rem / 1.35 var(--sans); color: var(--ink); }
.otd-ev .why { margin: 0; font-size: 0.9rem; line-height: 1.5; color: var(--ink-2); }
.otd-ev .otd-note { margin: 0.25rem 0 0; font-size: 0.8rem; color: var(--muted); font-style: italic; }
.otd-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem 0.5rem; margin: 0.45rem 0 0; font-size: 0.78rem; }
.vchip, .ochip, .today-flag {
  font: 700 0.66rem / 1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 999px;
  padding: 4px 8px;
}
.vchip { color: #fff; background: var(--muted); }
.vchip.v-convert { background: #c2412d; }
.vchip.v-move { background: var(--sea-500); }
.vchip.v-contain { background: #0b7d71; }
.vchip.v-regulate { background: #8a5a12; }
.vchip.v-direct { background: var(--otd-direct); }
.ochip { color: var(--sea-700); background: var(--teal-soft); }
.otd-meta .src { color: var(--sea-500); word-break: break-word; }
.today-flag { color: #fff; background: var(--coral); }
.otd-ev.is-today { background: var(--coral-soft); }
.otd-ev[hidden], .otd-actions[hidden] { display: none; }
.otd-empty { margin: 0; padding: 0 1.2rem 1.1rem; font-size: 0.9rem; color: var(--muted); }
.otd-method { max-width: 780px; }
.otd-method p, .otd-method li { color: var(--ink-2); }
.otd-method ul { padding-left: 1.2rem; }
@media (min-width: 1001px) {
  /* Full-width open card on desktop: two newspaper columns, read down then across. */
  .mcard[open] .otd-list { display: block; column-count: 2; column-gap: 2rem; column-rule: 1px solid var(--line); padding: 0.4rem 1.2rem 0.9rem; }
  .mcard[open] .otd-ev { break-inside: avoid; }
}
@media (max-width: 1000px) { .otd-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) {
  .otd-grid { grid-template-columns: minmax(0, 1fr); }
  .otd-ev { grid-template-columns: minmax(0, 1fr); padding-left: 0.6rem; }
  .otd-ev time { flex-direction: row; gap: 0.4rem; }
  .otd-list { padding: 0.3rem 0.6rem 0.7rem; }
}
@media (prefers-reduced-motion: reduce) { .mcard { transition: none; } }
/* ---------- /On this day ---------- */