/* Level catalogue: section-cards + chapter motifs from the validated chapters page.
   Only sizing, cycle controls and the preserved chooser heading are page-specific. */
body[data-page="choose-level"]:has([data-choose-level-entry]) {
  --choose-heading-shadow: none;
  --choose-back-bg: #182236;
  --choose-gold: #f8c76a;
  --choose-gold-rgb: 248 199 106;
  --choose-on-gold: #182236;
  display: flex;
  flex-direction: column;
  min-height: 100svh;
  background: var(--app-bg);
}
/* Same surface tokens as dashboard-common.css, without importing dashboard layouts. */
body:has([data-choose-catalogue]) {
  --dashboard-card-bg: rgba(15, 23, 42, .4);
  --dashboard-card-border: rgba(255, 255, 255, .05);
  --dashboard-card-hover-bg: linear-gradient(to bottom right, rgba(30, 41, 59, .7), rgba(15, 23, 42, .9));
  --dashboard-card-hover-shadow: 0 20px 40px -10px rgba(0, 0, 0, .5), 0 0 20px -5px var(--theme-color-glow);
  --chapter-green: #86efac;
  --chapter-green-bg: rgb(34 197 94 / 9%);
}
:root[data-theme="light"] body[data-page="choose-level"]:has([data-choose-level-entry]) {
  --choose-back-bg: #fff;
  --choose-gold: #8c6b1f;
  --choose-gold-rgb: 140 107 31;
  --choose-on-gold: #fff;
  --grid-opacity: .24;
  --dashboard-card-bg: linear-gradient(145deg, rgba(255, 255, 255, .9), rgba(248, 250, 252, .76));
  --dashboard-card-border: rgba(15, 23, 42, .08);
  --dashboard-card-hover-bg: linear-gradient(145deg, rgba(255, 255, 255, .98), rgba(238, 242, 255, .86));
  --dashboard-card-hover-shadow: 0 18px 36px -16px rgba(15, 23, 42, .24), 0 0 24px -12px var(--theme-color-glow);
  --chapter-green: #166534;
  --chapter-green-bg: rgb(22 101 52 / 7%);
}
body:has([data-choose-level-entry]) .page { flex: 1; min-height: 0; padding-block: 20px 24px; }
body:has([data-choose-level-entry]) .footer { position: relative; z-index: 1; margin-top: 8px; padding-block: 16px; }
body:has([data-choose-level-entry]) .math-drift { opacity: .62; mask-image: radial-gradient(ellipse at 50% 40%, rgb(0 0 0 / .25) 20%, #000 70%); }
body:has([data-choose-level-entry]) .math-drift > span { text-shadow: none; }
:root[data-theme="light"] body:has([data-choose-level-entry]) .math-drift {
  opacity: .72;
  mask-image: radial-gradient(ellipse at 50% 40%, rgb(0 0 0 / .4) 20%, #000 75%);
}
[data-choose-level-entry] .choose-level-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 16px; }
[data-choose-level-entry] .choose-level-toolbar .page-back-link { margin: 0; }
[data-choose-level-entry] .choose-entry-links { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px; }
[data-choose-level-entry] .choose-entry-links a { color: var(--text-main); font-size: .875rem; font-weight: 650; text-decoration: none; }
[data-choose-level-entry] .choose-entry-links a:hover { text-decoration: underline; text-underline-offset: 4px; }
[data-choose-level-entry] .choose-entry-links a:focus-visible { outline: 2px solid var(--app-accent-cyan); outline-offset: 4px; }
[data-page="choose-level"] [data-choose-level-entry] .hero { margin-bottom: 20px; }
[data-choose-level-entry] .greeting h1 { font-size: clamp(1.9rem, 4vw, 2.7rem); }
[data-choose-level-entry] .mathos-brand { font-size: clamp(1.4rem, 2.7vw, 1.75rem); margin-bottom: 12px; }
[data-choose-level-entry] .theme-toggle--public { color: var(--text-main); background: var(--choose-back-bg); border-color: var(--choose-back-border); }
[data-choose-catalogue] [hidden] { display: none !important; }
[data-choose-catalogue] .data-card { text-decoration: none; font-family: inherit; min-width: 0; }
[data-choose-catalogue] .data-card:focus-visible { outline: 3px solid var(--theme-color); outline-offset: 4px; }
[data-choose-catalogue] .card-content { min-width: 0; }
[data-choose-catalogue] .card-title { display: block; color: var(--text-main); }
[data-choose-catalogue] .card-description { display: block; color: var(--text-muted); font-size: .86rem; font-weight: 500; }
[data-choose-catalogue] .choose-level-college { --theme-color: #5eead4; --theme-color-glow: rgb(94 234 212 / .3); }
[data-choose-catalogue] .choose-year--premiere { --theme-color: #a78bfa; --theme-color-glow: rgb(167 139 250 / .3); }
[data-choose-catalogue] .choose-year--seconde { --theme-color: #5eead4; --theme-color-glow: rgb(94 234 212 / .24); }
[data-choose-catalogue] .choose-year--terminale { --theme-color: #60a5fa; --theme-color-glow: rgb(96 165 250 / .26); }
[data-choose-catalogue] .choose-level-other { --theme-color: var(--app-accent-cyan); --theme-color-glow: rgb(var(--app-accent-cyan-rgb) / .26); }
:root[data-theme="light"] [data-choose-catalogue] :is(.choose-level-college, .choose-year--seconde) { --theme-color: #087c70; --theme-color-glow: rgb(8 124 112 / .22); }
:root[data-theme="light"] [data-choose-catalogue] .choose-year--premiere { --theme-color: #7544b8; --theme-color-glow: rgb(117 68 184 / .22); }
:root[data-theme="light"] [data-choose-catalogue] .choose-year--terminale { --theme-color: #2465ad; --theme-color-glow: rgb(36 101 173 / .22); }
/* Gold horizontal selectors stay distinct from the chapter-style level cards. */
[data-choose-catalogue] .data-card.choose-cycle {
  --theme-color: var(--choose-gold); --theme-color-glow: rgb(var(--choose-gold-rgb) / .24);
  background: linear-gradient(125deg, rgb(var(--choose-gold-rgb) / .1), rgb(var(--choose-gold-rgb) / .025)), var(--app-bg);
  border-color: rgb(var(--choose-gold-rgb) / .35);
  display: grid; grid-template-columns: 48px minmax(0, 1fr) 32px;
  align-items: center; gap: 16px; min-height: 96px; padding: 18px 20px;
}
[data-choose-catalogue] .choose-cycle .card-title { font-size: 1.5rem; line-height: 1.2; font-weight: 800; margin: 0 0 5px; }
[data-choose-catalogue] .choose-cycle .choose-level-icon { display: grid; place-items: center; width: 48px; height: 48px; margin: 0; }
[data-choose-catalogue] .choose-cycle .choose-math-icon { font-size: 1.25rem; }
[data-choose-catalogue] .choose-cycle .emoji-icon { font-size: 30px; }
[data-choose-catalogue] .choose-cycle .card-action { width: auto; margin: 0; }
[data-choose-catalogue] .choose-cycle:is(:hover, :focus-visible) { border-color: var(--choose-gold); }
[data-choose-catalogue] .choose-cycle[aria-selected="true"] { border-color: var(--theme-color); box-shadow: inset 0 0 0 1px var(--theme-color); }
[data-choose-catalogue] .card-arrow { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid rgb(var(--choose-gold-rgb) / .35); border-radius: 50%; color: var(--choose-gold); transition: .18s ease; }
[data-choose-catalogue] .card-arrow svg { display: block; width: 19px; height: 19px; }
[data-choose-catalogue] .choose-cycle:is(:hover, :focus-visible) .card-arrow { border-color: var(--choose-gold); background: rgb(var(--choose-gold-rgb) / .1); box-shadow: 0 0 18px rgb(var(--choose-gold-rgb) / .35); }
[data-choose-catalogue] .choose-cycle[aria-selected="true"] .card-arrow { background: var(--choose-gold); color: var(--choose-on-gold); transform: rotate(90deg); }
[data-choose-catalogue] .choose-level-cycles { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
[data-choose-catalogue] .choose-level-panel { margin-top: 22px; }
[data-choose-catalogue] .choose-year + .choose-year { margin-top: 22px; }
[data-choose-catalogue] .choose-year-title { font-size: 1.1rem; color: var(--text-main); margin: 0 0 12px; font-weight: 750; display: flex; gap: 10px; align-items: center; }
[data-choose-catalogue] .choose-year-title::before { content: ''; width: 4px; height: 20px; border-radius: 3px; background: var(--theme-color, var(--app-accent-cyan)); }
[data-choose-catalogue] .chapter-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
/* All years share the same tracks, including the single Seconde card. */
[data-choose-catalogue] .chapter-grid .data-card { min-height: 190px; padding: 18px 20px; gap: 10px; }
[data-choose-catalogue] .chapter-grid .card-header { margin: 0; align-items: center; }
[data-choose-catalogue] .chapter-grid .card-chapter-number { font-size: 1.8rem; }
[data-choose-catalogue] .chapter-grid .card-badge { font-size: .64rem; padding: 5px 8px; white-space: nowrap; }
[data-choose-catalogue] .chapter-grid .card-content { margin: 0; }
[data-choose-catalogue] .chapter-grid .card-title { font-size: 1.03rem; line-height: 1.25; min-height: 2.5em; overflow-wrap: break-word; }
[data-choose-catalogue] .chapter-motif { height: 40px; min-width: 60px; border-radius: 10px; padding: 3px 10px; }
[data-choose-catalogue] .chapter-motif__formula { font-size: 1.25rem; }
[data-choose-catalogue] .choose-level-other:not(:has(.data-card)) { display: none; }
[data-choose-catalogue] .choose-level-other:has(.data-card) { margin-top: 22px; }
/* Existing POST chooser: the catalogue's cards, with the original level IDs.
   This marker is only rendered for Mathos; IA keeps its level-card presentation. */
[data-choose-selection] .choose-selection-intro {
  margin: 0 0 24px;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.5;
}
[data-choose-selection] .choose-selection-grid {
  --theme-color: #a78bfa;
  --theme-color-glow: rgb(167 139 250 / .3);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr));
  max-width: 800px;
  margin-inline: auto;
}
:root[data-theme="light"] [data-choose-selection] .choose-selection-grid {
  --theme-color: #7544b8;
  --theme-color-glow: rgb(117 68 184 / .22);
}
[data-choose-selection] .choose-selection-grid:has(> .card-form:only-child) {
  grid-template-columns: minmax(0, 1fr);
  max-width: 340px;
}
[data-choose-selection] .card-form { margin: 0; min-width: 0; }
[data-choose-selection] .card-form .data-card { height: 100%; }
[data-choose-selection] .card-title { font-weight: 700; }
[data-choose-selection] .data-card--disabled { cursor: default; }
[data-choose-selection] .data-card--disabled:is(:hover, :focus-visible) { transform: none; }
body:has([data-choose-catalogue]) .page { align-items: start; justify-content: start; }
[data-mobile-light-mode="1"]:has([data-choose-level-entry]) .math-drift { display: none; }
@media (hover: hover) and (pointer: fine) {
  [data-choose-catalogue] .data-card:hover { transform: translateY(-4px); }
}
@media (min-width: 1001px) {
  body:has([data-choose-catalogue]) .footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 6px 18px; padding-block: 12px; }
  body:has([data-choose-catalogue]) .footer div { margin: 0; }
}
@media (max-height: 900px) and (min-width: 1001px) {
  [data-choose-catalogue] .chapter-grid .data-card { min-height: 164px; padding: 16px 18px; gap: 8px; }
  [data-choose-catalogue] .chapter-motif { height: 32px; }
}
@media (max-width: 1000px), (max-height: 900px) {
  body:has([data-choose-catalogue]) .page { padding-block: 16px 20px; }
  [data-page="choose-level"] [data-choose-level-entry] .hero { margin-bottom: 18px; }
  [data-choose-catalogue] .data-card.choose-cycle { min-height: 88px; padding-block: 14px; }
  [data-choose-catalogue] .choose-level-panel, [data-choose-catalogue] .choose-year + .choose-year { margin-top: 16px; }
  [data-choose-catalogue] .choose-year-title { margin-bottom: 8px; }
}
@media (min-width: 1001px) and (max-height: 780px) {
  body:has([data-choose-catalogue]) .page { padding-block: 12px 14px; }
  [data-choose-level-entry] .choose-level-toolbar { margin-bottom: 12px; }
  [data-page="choose-level"] [data-choose-level-entry] .hero { margin-bottom: 12px; }
  [data-choose-catalogue] .data-card.choose-cycle { min-height: 76px; padding-block: 8px; }
  [data-choose-catalogue] .choose-level-panel, [data-choose-catalogue] .choose-year + .choose-year { margin-top: 12px; }
  body:has([data-choose-catalogue]) .footer { margin-top: 4px; }
}
/* On narrow screens the motif becomes the leading icon; the count sits under the title. */
@media (max-width: 1000px) {
  [data-choose-catalogue] .chapter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  [data-choose-catalogue] .chapter-grid .data-card { display: grid; grid-template-columns: 42px minmax(0, 1fr); grid-template-areas: "motif title" "motif count"; grid-template-rows: auto auto; align-content: center; gap: 4px 12px; min-height: 88px; padding: 12px 14px; }
  [data-choose-catalogue] .chapter-grid .card-header { grid-area: count; }
  [data-choose-catalogue] .chapter-grid .card-chapter-number { display: none; }
  [data-choose-catalogue] .chapter-grid .card-content { grid-area: title; }
  [data-choose-catalogue] .chapter-grid .card-title { font-size: .94rem; min-height: 0; }
  [data-choose-catalogue] .chapter-motif { grid-area: motif; align-self: center; width: 42px; min-width: 0; height: 40px; margin: 0; padding: 4px; }
  [data-choose-catalogue] .chapter-motif__formula { font-size: 1.1rem; }
  [data-choose-catalogue] .chapter-grid .card-badge { font-size: .6rem; padding: 3px 7px; }
}
@media (max-width: 768px) {
  :root[data-theme="light"] body:has([data-choose-level-entry]) { --grid-opacity: .18; }
  body:has([data-choose-catalogue]) .page { padding-inline: 16px; }
  [data-choose-catalogue] .choose-level-cycles { gap: 12px; }
  [data-choose-catalogue] .data-card.choose-cycle { grid-template-columns: 36px minmax(0, 1fr); padding: 14px 12px; gap: 10px; }
  [data-choose-catalogue] .choose-cycle .card-title { font-size: 1.2rem; }
  [data-choose-catalogue] .choose-cycle .card-description { font-size: .78rem; line-height: 1.3; }
  [data-choose-catalogue] .choose-cycle .choose-level-icon { width: 36px; height: 36px; }
  [data-choose-catalogue] .choose-cycle .choose-math-icon { font-size: 1rem; }
  [data-choose-catalogue] .choose-cycle .emoji-icon { font-size: 27px; }
  [data-choose-catalogue] .choose-cycle .card-action { display: none; }
}
@media (max-width: 620px) {
  [data-choose-catalogue] .chapter-grid { grid-template-columns: 1fr; gap: 8px; }
  [data-choose-catalogue] .data-card.choose-cycle { grid-template-columns: 28px minmax(0, 1fr); min-height: 68px; padding: 12px; gap: 8px; }
  [data-choose-catalogue] .choose-cycle .card-description { display: none; }
  [data-choose-catalogue] .choose-cycle .card-title { font-size: 1.1rem; margin: 0; }
  [data-choose-catalogue] .choose-cycle .choose-level-icon { width: 28px; height: 28px; }
  [data-choose-catalogue] .choose-cycle .emoji-icon { font-size: 24px; }
  [data-choose-catalogue] .chapter-grid .data-card { min-height: 76px; padding: 10px 14px; }
}
@media (prefers-reduced-motion: reduce) {
  [data-choose-level-entry] *, [data-choose-level-entry] *::before, [data-choose-level-entry] *::after { animation: none !important; transition: none !important; }
  [data-choose-catalogue] .data-card:is(:hover, :focus-visible),
  [data-choose-catalogue] .data-card:is(:hover, :focus-visible) .card-chapter-number { transform: none; }
}