/*
 * Scene pieces: the site header, the hero "planet", horizon glows, and the
 * editorial list rows used on the home page.
 *
 * The planet is the site's one signature object. It rises into view on
 * load, and as the visitor scrolls, motion.js lifts and enlarges it while
 * the hero copy blurs away, the camera move from the reference. Its surface
 * is a field of faint hexagonal cells lit electric blue from above.
 */

/* ====================================================================
   Site header
   ==================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  transition:
    background-color 600ms var(--ease-out-soft),
    border-color 600ms var(--ease-out-soft),
    -webkit-backdrop-filter 600ms var(--ease-out-soft),
    backdrop-filter 600ms var(--ease-out-soft);
}

.site-header[data-scrolled],
.site-header:has([data-nav-toggle][aria-expanded="true"]) {
  background-color: rgba(5, 7, 13, 0.72);
  border-bottom-color: rgba(232, 237, 246, 0.07);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  backdrop-filter: blur(18px) saturate(140%);
}

.site-header__bar {
  height: 4.5rem;
}

/* Hairline under the bar at rest, inset to the content measure (reference). */
.site-header__rule {
  position: absolute;
  left: 50%;
  bottom: -1px;
  width: min(76rem, 100%);
  translate: -50% 0;
  height: 1px;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
  background-clip: content-box;
  background-color: rgba(232, 237, 246, 0.07);
  transition: opacity 600ms var(--ease-out-soft);
}

.site-header[data-scrolled] .site-header__rule {
  opacity: 0;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  height: 4.5rem;
  padding-inline: 0.9rem;
  font-size: 0.875rem;
  font-weight: 450;
  color: rgba(232, 237, 246, 0.6);
  transition: color 400ms var(--ease-out-soft);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0.9rem;
  right: 0.9rem;
  bottom: -1px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-secondary);
  box-shadow: 0 0 12px rgba(124, 203, 255, 0.6);
  transform: scaleX(0);
  transition: transform 600ms var(--ease-out-soft);
}

.nav-link:hover {
  color: var(--color-base-content);
}

.nav-link[aria-current="page"] {
  color: #ffffff;
}

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

/* Until the scripts have run, keep the (JS-driven) mobile panel closed so it
   never flashes open. If JS fails, motion-init.js drops .js and it shows. */
.js:not(.motion-live) #mobile-nav-panel {
  display: none;
}

/* Mobile panel slides down softly instead of popping. */
#mobile-nav-panel:not([hidden]) {
  animation: panel-in 500ms var(--ease-out-soft) both;
}

@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
    filter: blur(6px);
  }
}

/* ====================================================================
   Hero
   ==================================================================== */

.hero {
  /* How much of the planet shows above the fold. */
  --peek: clamp(9rem, 27svh, 16rem);
  position: relative;
  isolation: isolate;
  overflow: hidden;
  height: calc(100svh - 4.5rem);
  min-height: 40rem;
  display: flex;
  flex-direction: column;
}

/* The sky layer holds the planet and fades it to transparent toward the
   bottom of the hero, so it dissolves into the page background instead of
   ending on a hard edge when it rises. */
.hero__sky {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 84%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, #000 84%, transparent 100%);
}

.hero__content {
  position: relative;
  z-index: 2;
  will-change: transform, opacity, filter;
}

/* The planet: an absolutely placed rig (moved by motion.js on scroll)
   holding the sphere (which rises in with a CSS animation on load). */
.planet-rig {
  --planet: clamp(40rem, 92vw, 86rem);
  position: absolute;
  z-index: 1;
  left: 50%;
  top: calc(100% - var(--peek));
  width: var(--planet);
  aspect-ratio: 1;
  margin-left: calc(var(--planet) / -2);
  transform-origin: 50% 0%;
  will-change: transform;
  pointer-events: none;
}

.planet {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  animation: planet-rise 2600ms var(--ease-out-soft) 150ms both;
}

@keyframes planet-rise {
  from {
    opacity: 0;
    transform: translate3d(0, 14%, 0) scale(0.96);
  }
}

/* Atmosphere: a haze just outside the limb. */
.planet::before {
  content: "";
  position: absolute;
  inset: -6%;
  border-radius: 50%;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(0, 87, 255, 0) 45%,
    rgba(0, 87, 255, 0.34) 47.4%,
    rgba(40, 120, 255, 0.12) 50%,
    rgba(0, 87, 255, 0) 56%
  );
  filter: blur(6px);
}

.planet__body,
.planet__cells,
.planet__dust,
.planet__limb {
  position: absolute;
  inset: 0;
  border-radius: 50%;
}

/* Lit from directly above: a bright cap fading to night. */
.planet__body {
  overflow: hidden;
  background:
    radial-gradient(circle at 50% -4%, #3b7dff 0%, #0f47e6 7%, #07288f 16%, #041545 30%, #030a1f 46%, #02050d 64%);
}

/* Hexagonal cells wrapped onto the sphere (tools/scene_art.py), so they
   foreshorten toward the limb. Strongest under the lit cap, gone by the
   night side. The whole surface sways a few degrees, a slow rotation. */
.planet__cells {
  background: url("../images/planet-cells.svg") center / 100% 100% no-repeat;
  opacity: 0.55;
  mix-blend-mode: screen;
  -webkit-mask-image: radial-gradient(circle at 50% 0%, #000 0%, rgba(0, 0, 0, 0.75) 20%, rgba(0, 0, 0, 0.25) 38%, transparent 55%);
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, rgba(0, 0, 0, 0.75) 20%, rgba(0, 0, 0, 0.25) 38%, transparent 55%);
  animation: planet-sway 80s var(--ease-in-out-soft) infinite alternate;
}

@keyframes planet-sway {
  from {
    transform: rotate(-4deg);
  }
  to {
    transform: rotate(4deg);
  }
}

/* Cyan sparkle dust on the surface (the reference's glittering cells). */
.planet__dust {
  background-image: var(--dust);
  background-size: 300px 300px;
  opacity: 0.55;
  mix-blend-mode: screen;
  -webkit-mask-image: radial-gradient(circle at 50% 0%, #000 0%, rgba(0, 0, 0, 0.4) 20%, transparent 40%);
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, rgba(0, 0, 0, 0.4) 20%, transparent 40%);
  animation: dust-twinkle 5s ease-in-out infinite alternate;
}

@keyframes dust-twinkle {
  from {
    opacity: 0.25;
  }
  to {
    opacity: 0.65;
  }
}

/* The thin bright limb, limb darkening toward the sides, and the inner /
   outer blue glow. */
.planet__limb {
  background: radial-gradient(circle at 50% 50%, rgba(2, 5, 13, 0) 60%, rgba(2, 5, 13, 0.45) 71%);
  box-shadow:
    inset 0 2px 1px -1px rgba(200, 228, 255, 0.85),
    inset 0 28px 60px -24px rgba(90, 160, 255, 0.55),
    0 -2px 24px rgba(124, 203, 255, 0.28),
    0 -24px 120px -10px rgba(0, 87, 255, 0.5);
}

/* Scroll cue, seated on the planet's limb like the reference's arrow. */
.hero__cue {
  position: absolute;
  z-index: 3;
  left: 50%;
  bottom: clamp(1.5rem, 4svh, 2.5rem);
  translate: -50% 0;
  background-color: rgba(5, 7, 13, 0.45);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.hero__cue svg {
  animation: cue-bob 2.8s var(--ease-in-out-soft) infinite;
}

@keyframes cue-bob {
  50% {
    transform: translateY(3px);
  }
}

/* A smaller horizon for closing sections: a planet limb glowing up from
   the bottom edge. */
.horizon {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

.horizon::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: 50%;
  top: 100%;
  width: min(70rem, 140vw);
  aspect-ratio: 1;
  translate: -50% -9%;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 0%, #1b56ff 0%, #07288f 9%, #041240 22%, #02050d 48%);
  box-shadow:
    inset 0 2px 1px -1px rgba(200, 228, 255, 0.7),
    0 -20px 100px -10px rgba(0, 87, 255, 0.45);
}

/* ====================================================================
   Editorial rows (selected work, courses)
   ==================================================================== */

.row-list {
  border-top: 1px solid rgba(232, 237, 246, 0.08);
}

.row-link {
  position: relative;
  display: grid;
  gap: 0.75rem 2rem;
  padding-block: clamp(1.75rem, 3vw, 2.5rem);
  border-bottom: 1px solid rgba(232, 237, 246, 0.08);
  isolation: isolate;
}

@media (min-width: 768px) {
  .row-link {
    grid-template-columns: 3.5rem minmax(0, 1.15fr) minmax(0, 1fr) auto;
    align-items: baseline;
  }
}

/* Soft light sweeps in behind the hovered row. */
.row-link::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0 -1rem;
  border-radius: 1rem;
  background: radial-gradient(40rem 8rem at var(--mx, 30%) 50%, rgba(0, 87, 255, 0.1), transparent 70%);
  opacity: 0;
  transition: opacity 600ms var(--ease-out-soft);
}

.row-link:hover::before {
  opacity: 1;
}

.row-link__index {
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  color: rgba(124, 203, 255, 0.8);
}

.row-link__title {
  font-size: clamp(1.5rem, 2.2vw, 2rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--color-base-content);
  transition:
    transform 700ms var(--ease-out-soft),
    color 500ms var(--ease-out-soft);
}

.row-link:hover .row-link__title {
  transform: translateX(0.5rem);
  color: #ffffff;
}

.row-link__arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 9999px;
  border: 1px solid rgba(232, 237, 246, 0.14);
  color: rgba(232, 237, 246, 0.7);
  align-self: center;
  transition:
    background-color 600ms var(--ease-out-soft),
    border-color 600ms var(--ease-out-soft),
    color 600ms var(--ease-out-soft),
    transform 700ms var(--ease-out-soft);
}

.row-link:hover .row-link__arrow {
  background-color: #eaf1ff;
  border-color: #eaf1ff;
  color: #050a18;
  transform: rotate(-45deg);
}

@media (prefers-reduced-motion: reduce) {
  .planet,
  .planet__cells,
  .planet__dust,
  .hero__cue svg {
    animation: none;
  }
  .row-link:hover .row-link__title,
  .row-link:hover .row-link__arrow {
    transform: none;
  }
}

/* ====================================================================
   Auth panel - vertical rhythm between Flask-WTF fields
   ==================================================================== */

.auth-panel .form-control {
  margin-bottom: 1.25rem;
}

/* ====================================================================
   Pagination (components/pagination.html)
   ==================================================================== */

.pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-top: 4rem;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.5rem;
  height: 2.5rem;
  padding-inline: 0.85rem;
  border-radius: 9999px;
  border: 1px solid transparent;
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  color: rgba(232, 237, 246, 0.6);
  transition:
    color 400ms var(--ease-out-soft),
    border-color 400ms var(--ease-out-soft),
    background-color 400ms var(--ease-out-soft);
}

.pagination a:hover {
  color: var(--color-base-content);
  border-color: rgba(232, 237, 246, 0.16);
}

.pagination .is-active {
  color: #050a18;
  background-color: #eaf1ff;
}

.pagination a[aria-disabled="true"] {
  opacity: 0.35;
  pointer-events: none;
}

/* ====================================================================
   Legal documents (legal/_legal_base.html)
   ==================================================================== */

.legal-content {
  max-width: 44rem;
  color: rgba(232, 237, 246, 0.66);
  font-size: 1.02rem;
  line-height: 1.8;
}

.legal-content h2 {
  margin-top: 3.5rem;
  font-size: 1.45rem;
  line-height: 1.3;
  letter-spacing: -0.03em;
  color: var(--color-base-content);
}

.legal-content h2:first-child {
  margin-top: 0;
}

.legal-content h3 {
  margin-top: 2rem;
  font-size: 1.1rem;
  color: var(--color-base-content);
}

.legal-content p,
.legal-content ul,
.legal-content ol {
  margin-top: 1rem;
}

.legal-content ul,
.legal-content ol {
  padding-left: 1.25rem;
}

.legal-content ul {
  list-style-type: disc;
}

.legal-content ol {
  list-style-type: decimal;
}

.legal-content li + li {
  margin-top: 0.5rem;
}

.legal-content li::marker {
  color: rgba(124, 203, 255, 0.6);
}

.legal-content a {
  color: var(--color-secondary);
  text-decoration: underline;
  text-decoration-color: rgba(124, 203, 255, 0.35);
  text-underline-offset: 3px;
}

.legal-content a:hover {
  text-decoration-color: currentColor;
}

.legal-content strong {
  color: var(--color-base-content);
  font-weight: 500;
}