/* Shared landing-page layout. All content is available without JavaScript. */
.course-page { --scene: #eef2e9; --scene-accent: #c9d8b8; }
.course-page[data-theme='water'] { --scene: #e7f1f2; --scene-accent: #b8d8db; }
.course-page[data-theme='sand'] { --scene: #f4efe5; --scene-accent: #e0cda6; }
.course-page[data-theme='rose'] { --scene: #f4eae4; --scene-accent: #dfc5b9; }
.course-page[data-theme='lavender'] { --scene: #eeedf5; --scene-accent: #cdc8e2; }
.desktop-nav a[aria-current='location']::after { transform: scaleX(1); }
.course-hero { display: grid; grid-template-columns: 1fr 1.1fr; gap: clamp(32px, 5vw, 88px); align-items: center; padding-block: 54px 80px; }
.course-hero-copy, .course-visual { min-width: 0; }
.course-back { display: inline-flex; align-items: center; gap: 12px; font-size: 16px; color: var(--muted); min-height: 44px; margin-bottom: 28px; }
.course-back > span { display: flex; transform: rotate(180deg); transition: translate .3s var(--ease-out); }
.course-back:hover { color: var(--ink); }
.course-back:hover > span { translate: -5px 0; }
.course-hero h1 { font-size: clamp(3rem, 1.3rem + 3.8vw, 5.8rem); line-height: 1.025; letter-spacing: -.065em; }
.course-hero h1 .hero-line:last-child { color: var(--green); }
.course-lede { font-size: clamp(1.0625rem, 1rem + .2vw, 1.25rem); line-height: 1.65; max-width: 36ch; color: var(--muted); margin-top: 28px; }
.course-hero-actions { margin-top: 32px; display: flex; align-items: flex-start; flex-direction: column; gap: 16px; }
.course-hero-actions .button { gap: 18px; text-align: left; }
.course-jump { display: inline-flex; align-items: center; gap: 18px; min-height: 44px; font-size: 16px; }
.course-jump span { transition: translate .3s var(--ease-out); }
.course-jump:hover span { translate: 0 5px; }
.course-scene { position: relative; isolation: isolate; overflow: clip; aspect-ratio: 1.08; border-radius: 12px; background: var(--scene); box-shadow: 0 30px 70px -55px #263e2b70; }
.scene-grid { position: absolute; inset: 0; opacity: .22; background-image: linear-gradient(#8c9a901f 1px, transparent 1px), linear-gradient(90deg, #8c9a901f 1px, transparent 1px); background-size: 40px 40px; mask-image: linear-gradient(transparent, black 35%, black 65%, transparent); }
.scene-disc { position: absolute; width: 74%; aspect-ratio: 1; left: 13%; top: 13%; border-radius: 50%; background: radial-gradient(circle at 35% 30%, #ffffffba, var(--scene-accent)); opacity: .65; }
.scene-orbit { position: absolute; width: 90%; aspect-ratio: 1; left: 5%; top: 5%; border: 1px solid #3d4f442b; border-radius: 50%; transform: rotate(-32deg) scaleY(.7); }
.scene-orbit::before, .scene-orbit::after { content: ''; position: absolute; width: 14px; height: 14px; background: var(--green); border: 4px solid var(--scene); border-radius: 50%; left: 49%; top: -7px; }
.scene-orbit::after { top: auto; bottom: -7px; background: var(--scene-accent); }
.course-object { position: absolute; inset: 0; height: 100%; width: 100%; object-fit: contain; scale: var(--object-scale, 1.32); filter: drop-shadow(0 25px 15px #3d4f4412); }
.course-photo { height: 100%; width: 100%; object-fit: cover; }
.course-learning { display: grid; grid-template-columns: 1fr 1.1fr; gap: clamp(32px, 5vw, 88px); align-items: start; padding-block: 68px 90px; border-top: 1px solid var(--line); scroll-margin-top: 30px; }
.learning-heading { position: sticky; top: 140px; }
.learning-heading h2 { font-size: clamp(2.5rem, 1.8rem + 2vw, 3.75rem); line-height: 1.08; }
.learning-outline { min-width: 0; border-top: 1px solid var(--line); }
.learning-step { border-bottom: 1px solid var(--line); }
.learning-step summary { display: flex; align-items: center; gap: 20px; min-height: 100px; padding: 23px 0; font-family: var(--display); font-size: clamp(1.25rem, 1.1rem + .5vw, 1.65rem); line-height: 1.25; letter-spacing: -.03em; cursor: pointer; list-style: none; }
.learning-step summary::-webkit-details-marker { display: none; }
.learning-step summary:hover { color: var(--green); }
.step-number { flex: 0 0 32px; color: #7d877c; font-size: 18px; font-family: var(--body); letter-spacing: -.04em; }
.step-toggle { display: grid; place-items: center; flex: 0 0 40px; height: 40px; margin-left: auto; border-radius: 50%; border: 1px solid var(--line); transition: background .3s, color .3s, transform .4s var(--ease-out); }
.step-toggle svg { width: 19px; height: 19px; }
.learning-step[open] .step-toggle { transform: rotate(90deg); background: var(--green); color: white; border-color: var(--green); }
.step-description { padding: 0 54px 30px 52px; }
.step-description p { font-size: 18px; line-height: 1.75; color: var(--muted); max-width: 48ch; }
.course-related { border-top: 1px solid var(--line); padding-block: 56px 80px; }
.course-related .section-heading h2 { margin-top: 0; }
.course-contact { border-top: 1px solid var(--line); }
.course-contact p { font-size: 18px; color: var(--muted); }

/* Browsers without intrinsic-size transitions retain native instant disclosures. */
@supports (interpolate-size: allow-keywords) and selector(::details-content) {
  .learning-outline { interpolate-size: allow-keywords; }
  .learning-step::details-content { block-size: 0; overflow: clip; transition: block-size .45s var(--ease-out), content-visibility .45s allow-discrete; }
  .learning-step[open]::details-content { block-size: auto; }
}
@supports (animation-timeline: view()) and (animation-range: entry) {
  .course-photo { animation: course-photo-travel linear both; animation-timeline: view(); animation-range: entry 0% exit 100%; }
  @keyframes course-photo-travel { from { transform: scale(1.1) translateY(-2%); } to { transform: scale(1.1) translateY(2%); } }
}
@media (hover: hover) and (pointer: fine) {
  .course-scene .course-object { transition: scale 1s var(--ease-out); }
  .course-scene:hover .course-object { scale: calc(var(--object-scale, 1.32) + .08); }
}
@media (max-width: 1100px) {
  .course-hero, .course-learning { gap: 36px; }
  .course-hero h1 { font-size: clamp(2.75rem, 5.4vw, 4rem); }
  .course-scene { aspect-ratio: .85; }
  .course-page { --object-scale: 1.45; }
  .course-back { margin-bottom: 20px; }
}
@media (max-width: 700px) {
  .course-hero { grid-template-columns: 1fr; gap: 32px; padding-block: 20px 48px; }
  .course-hero h1 { font-size: clamp(2.75rem, 11.4vw, 4.75rem); }
  .course-back { margin-bottom: 20px; }
  .course-lede { margin-top: 22px; max-width: 42ch; font-size: 17px; }
  .course-hero-actions { margin-top: 24px; gap: 10px; }
  .course-hero-actions .button { font-size: 15px; padding-inline: 19px; gap: 16px; }
  .course-scene { aspect-ratio: 1.12; }
  .course-page { --object-scale: 1.25; }
  .course-learning { grid-template-columns: 1fr; gap: 32px; padding-block: 44px 54px; }
  .learning-heading { position: static; }
  .learning-heading h2 { font-size: clamp(2.25rem, 9vw, 3rem); }
  .learning-step summary { font-size: 20px; min-height: 88px; gap: 12px; padding-block: 20px; }
  .step-number { flex-basis: 25px; font-size: 16px; }
  .step-toggle { flex-basis: 34px; height: 34px; }
  .step-description { padding: 0 12px 25px 37px; }
  .step-description p { font-size: 17px; }
  .course-related { padding-block: 42px 48px; }
  .course-related .section-heading h2 { font-size: 36px; }
  .course-contact p { font-size: 17px; }
}
html[data-motion='reduced'] .course-photo, html[data-motion='reduced'] .course-object { transform: none !important; }
html[data-motion='reduced'] .course-scene:hover .course-object { scale: var(--object-scale, 1.32); }
@media (prefers-reduced-motion: reduce) {
  .course-photo, .course-object { transform: none !important; }
  .course-scene:hover .course-object { scale: var(--object-scale, 1.32); }
}