.section-sect-fullscreen {
  --sect-view-height: 100vh;
  --sect-canvas-width: max(100vw, calc(var(--sect-view-height) * 16 / 9));
  --sect-canvas-height: max(var(--sect-view-height), calc(100vw * 9 / 16));
  position: relative;
  display: block !important;
  width: 100% !important;
  max-width: none !important;
  height: var(--sect-view-height) !important;
  min-height: var(--sect-view-height) !important;
  margin: 0 !important;
  padding: 0 !important;
  overflow: hidden !important;
  border: 0;
  background: #dfe8f5 !important;
}

@supports (height: 100dvh) {
  .section-sect-fullscreen {
    --sect-view-height: 100dvh;
  }
}

.section-sect-fullscreen::before,
.section-sect-fullscreen::after {
  display: none !important;
  animation: none !important;
}

.sect-preview-embed {
  --sect-ink: #16283b;
  --sect-accent: #c5574d;
  --sect-line: rgba(22, 40, 59, 0.28);
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  color: var(--sect-ink);
}

.sect-preview-stage {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #dfe8f5;
  isolation: isolate;
  outline: none;
  overscroll-behavior-x: contain;
  overscroll-behavior-y: auto;
  touch-action: pan-y;
  user-select: none;
}

.sect-preview-stage:focus-visible {
  box-shadow: inset 0 0 0 3px var(--sect-accent);
}

.sect-preview-stage img {
  display: block;
  max-width: none;
  -webkit-user-drag: none;
}

/* Official page behavior: one 1920x1080 canvas covers the viewport. */
.sect-preview-scene,
.sect-preview-role-layer,
.sect-preview-info-layer {
  position: absolute;
  top: 0;
  left: 50%;
  width: var(--sect-canvas-width);
  height: var(--sect-canvas-height);
  transform: translateX(-50%);
}

.sect-preview-scene {
  z-index: 0;
  object-fit: fill;
}

.sect-preview-info-layer {
  z-index: 1;
  pointer-events: none;
}

.sect-preview-role-layer {
  z-index: 2;
  pointer-events: none;
}

.sect-preview-role-layer img,
.sect-preview-info-panel,
.sect-preview-info-panel > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.sect-preview-role-layer img {
  object-fit: fill;
  opacity: 0;
  transform: translateX(-5%) scale(0.95);
  transition: opacity 0.35s ease, transform 0.55s ease;
}

.sect-preview-role-layer img.is-active {
  opacity: 1;
  transform: translateX(0) scale(1);
}

.sect-preview-info-panel {
  opacity: 0;
  transition: opacity 0.2s ease;
}

.sect-preview-info-panel.is-active {
  opacity: 1;
}

.sect-preview-info-panel .sect-preview-info-backdrop,
.sect-preview-info-panel .sect-preview-info-art {
  object-fit: fill;
}

.sect-preview-info-art {
  opacity: 0;
  transform: translateX(-4%);
  transition: opacity 0.3s ease, transform 0.4s ease;
}

.sect-preview-info-panel.is-active .sect-preview-info-art {
  opacity: 1;
  transform: translateX(0);
}

.sect-preview-info-copy {
  position: absolute;
  top: 35.416667%;
  left: 11.875%;
  width: 16.875%;
  color: #111;
  opacity: 0;
  transform: translateX(-4%);
  transition: opacity 0.3s ease, transform 0.4s ease;
  font-family: "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: clamp(10px, 0.9375vw, 18px);
  line-height: 2.5;
}

.sect-preview-info-panel.is-active .sect-preview-info-copy {
  opacity: 1;
  transform: translateX(0);
}

.sect-preview-info-copy p {
  margin: 0;
  white-space: nowrap;
}

.sect-preview-info-copy b {
  font-weight: 700;
}

.sect-preview-picker {
  position: absolute;
  z-index: 4;
  top: 0;
  right: min(0px, calc((100vw - var(--sect-canvas-width)) / 2));
  width: max(15.833333vw, calc(var(--sect-view-height) * 304 / 1080));
  height: max(52.708333vw, calc(var(--sect-view-height) * 1012 / 1080));
  background: url("assets/sect-preview/sect_bg.webp") 50% 0 / 100% 100% no-repeat;
}

.sect-preview-picker-label {
  position: absolute;
  top: 1.481%;
  right: 6.579%;
  color: #36516a;
  font-size: clamp(9px, 0.729167vw, 14px);
  writing-mode: vertical-rl;
}

.sect-preview-sect-list {
  position: absolute;
  width: 33.881579%;
  padding: 0;
  margin: 0;
  list-style: none;
}

.sect-preview-sect-left {
  top: 10.177866%;
  left: 0;
}

.sect-preview-sect-right {
  top: 22.924901%;
  left: 49.342105%;
  width: 50.657895%;
}

.sect-preview-sect-button {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 1;
  padding: 0;
  margin: 0;
  border: 0;
  background: none;
  cursor: pointer;
  touch-action: manipulation;
}

.sect-preview-sect-button img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: opacity 0.18s ease;
}

.sect-preview-sect-button .icon-active { opacity: 0; }
.sect-preview-sect-button.is-active .icon-normal { opacity: 0; }
.sect-preview-sect-button.is-active .icon-active { opacity: 1; }

.sect-preview-sect-left .sect-preview-sect-button:nth-child(1) {
  margin-left: max(5.677083vw, calc(var(--sect-view-height) * 109 / 1080));
  margin-bottom: max(0.15625vw, calc(var(--sect-view-height) * 3 / 1080));
}

.sect-preview-sect-left .sect-preview-sect-button:nth-child(2) {
  margin-left: max(2.552083vw, calc(var(--sect-view-height) * 49 / 1080));
  margin-bottom: max(0.520833vw, calc(var(--sect-view-height) * 10 / 1080));
}

.sect-preview-sect-left .sect-preview-sect-button:nth-child(3) {
  margin-left: max(0.729167vw, calc(var(--sect-view-height) * 14 / 1080));
  margin-bottom: max(0.416667vw, calc(var(--sect-view-height) * 8 / 1080));
}

.sect-preview-sect-left .sect-preview-sect-button:nth-child(4) {
  margin-left: 0;
  margin-bottom: max(0.572917vw, calc(var(--sect-view-height) * 11 / 1080));
}

.sect-preview-sect-left .sect-preview-sect-button:nth-child(5) {
  margin-left: max(0.677083vw, calc(var(--sect-view-height) * 13 / 1080));
  margin-bottom: max(0.364583vw, calc(var(--sect-view-height) * 7 / 1080));
}

.sect-preview-sect-left .sect-preview-sect-button:nth-child(6) {
  margin-left: max(2.5vw, calc(var(--sect-view-height) * 48 / 1080));
  margin-bottom: max(0.260417vw, calc(var(--sect-view-height) * 5 / 1080));
}

.sect-preview-sect-left .sect-preview-sect-button:nth-child(7) {
  margin-left: max(5.677083vw, calc(var(--sect-view-height) * 109 / 1080));
}

.sect-preview-sect-right .sect-preview-sect-button {
  width: 66.883117%;
}

.sect-preview-sect-right .sect-preview-sect-button:nth-child(1) { margin-left: 33.766234%; }
.sect-preview-sect-right .sect-preview-sect-button:nth-child(2) { margin-left: 9.090909%; }
.sect-preview-sect-right .sect-preview-sect-button:nth-child(3) { margin-left: 0; }
.sect-preview-sect-right .sect-preview-sect-button:nth-child(4) { margin-left: 9.090909%; }
.sect-preview-sect-right .sect-preview-sect-button:nth-child(5) { margin-left: 33.766234%; }

.sect-preview-caption {
  position: absolute;
  z-index: 5;
  right: 18px;
  bottom: 14px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: #29445c;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.55);
}

.sect-preview-caption small {
  font-size: 8px;
}

.sect-preview-caption strong {
  font-size: clamp(13px, 1.1vw, 22px);
}

.sect-preview-mobile-picker {
  display: none;
}

.sect-preview-controls {
  position: absolute;
  z-index: 6;
  left: 50%;
  bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin: 0;
  transform: translateX(-50%);
}

.sect-preview-arrow {
  display: inline-grid;
  width: 32px;
  height: 32px;
  place-items: center;
  padding: 0 0 3px;
  border: 1px solid rgba(198, 149, 57, 0.55);
  border-radius: 50%;
  background: #090c0d;
  color: #f0cd76;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.sect-preview-arrow:hover,
.sect-preview-arrow:focus-visible {
  background: #7d2119;
}

.sect-preview-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-width: 130px;
  color: #a9967a;
  font-size: 12px;
}

.sect-preview-status > span:first-child { color: #f0cd76; font-weight: 700; }
.sect-preview-status b { color: #db3b2c; font-variant-numeric: tabular-nums; }
.sect-preview-status i { width: 1px; height: 14px; background: var(--sect-line); }

@media (max-width: 980px) {
  .section-sect-fullscreen {
    --sect-view-height: 100dvh;
    --sect-canvas-width: 100vw;
    --sect-canvas-height: var(--sect-view-height);
  }

  .sect-preview-scene,
  .sect-preview-role-layer,
  .sect-preview-info-layer {
    left: 0;
    width: 100%;
    height: 100%;
    transform: none;
  }

  .sect-preview-scene {
    object-fit: cover;
    object-position: 74% center;
  }

  .sect-preview-role-layer {
    z-index: 2;
  }

  .sect-preview-role-layer img,
  .sect-preview-role-layer img.is-active {
    inset: 5% auto auto 50%;
    width: min(230vw, 900px);
    height: auto;
    object-fit: fill;
    transform: translateX(-50%);
    transition: opacity 0.35s ease;
  }

  .sect-preview-info-layer {
    z-index: 3;
  }

  .sect-preview-info-panel .sect-preview-info-backdrop {
    display: none;
  }

  .sect-preview-info-panel .sect-preview-info-art {
    inset: calc(8px - min(5.54vw, 21px)) auto auto calc(36px - min(18vw, 68px));
    z-index: 0;
    width: min(190vw, 720px);
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: fill;
    clip-path: inset(0 0 65% 0);
    transform: none;
  }

  .sect-preview-info-panel.is-active .sect-preview-info-art {
    transform: none;
  }

  .sect-preview-picker {
    display: none;
  }

  .sect-preview-info-panel::after,
  .sect-preview-info-panel::before {
    display: none;
  }

  .sect-preview-info-copy {
    z-index: 1;
    top: auto;
    right: auto;
    bottom: 168px;
    left: 50%;
    width: min(88vw, 340px);
    padding: 10px 12px;
    border: 1px solid rgba(198, 149, 57, 0.36);
    border-left: 2px solid rgba(198, 149, 57, 0.82);
    border-radius: 4px;
    background: rgba(7, 9, 11, 0.72);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.22);
    color: #f4eee2;
    font-size: clamp(9px, 2.5vw, 11px);
    line-height: 1.9;
    transform: translateX(-50%);
  }

  .sect-preview-info-copy b {
    color: #f1c96e;
  }

  .sect-preview-info-panel.is-active .sect-preview-info-copy {
    transform: translateX(-50%);
  }

  .sect-preview-caption {
    display: none;
  }

  .sect-preview-mobile-picker {
    position: absolute;
    z-index: 7;
    right: 0;
    bottom: 52px;
    left: 0;
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    grid-template-rows: repeat(2, 44px);
    gap: 4px;
    height: 108px;
    overflow: hidden;
    padding: 8px;
    background: rgba(9, 12, 13, 0.84);
    box-sizing: border-box;
  }

  .sect-preview-mobile-picker .sect-preview-sect-button {
    align-self: center;
    justify-self: center;
    width: clamp(36px, 10.75vw, 44px);
    margin: 0 !important;
  }

  .sect-preview-controls {
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 52px;
    gap: 16px;
    background: rgba(9, 12, 13, 0.9);
    transform: none;
  }

  .sect-preview-arrow {
    width: 36px;
    height: 36px;
  }

  .sect-preview-status {
    min-width: 140px;
    color: #ddd1bd;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sect-preview-role-layer img,
  .sect-preview-info-panel,
  .sect-preview-info-art,
  .sect-preview-info-copy,
  .sect-preview-sect-button img {
    transition: none;
  }
}

/* Fullscreen entrance, with the official site one click below. */
#classes { --entry-button-size: clamp(128px, 13vw, 184px); }
body.on-entry .site-header {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-110%);
}
#classes .entry-gateway {
  position: absolute;
  z-index: 20;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 24px 0 6px;
  pointer-events: none;
}
.entry-gateway::before {
  content: "";
  position: absolute;
  z-index: 0;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(var(--entry-button-size) + 34px);
  background: url("assets/sect-preview/entrance-base-solid.png") center top / auto calc(100% - 28px) no-repeat,
    linear-gradient(#1d1d2a, #1d1d2a) center bottom / 100% 28px no-repeat;
  opacity: .7;
}
.entry-gateway-button {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: var(--entry-button-size);
  height: var(--entry-button-size);
  margin: 0 auto;
  padding: 18px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: #774318;
  isolation: isolate;
  font-family: var(--serif);
  font-size: clamp(34px, 3.2vw, 46px);
  font-weight: 900;
  line-height: 1.08;
  text-align: center;
  text-shadow: 0 1px rgba(255, 248, 204, .7);
  pointer-events: auto;
  transition: filter .2s;
}
.entry-gateway-button::before {
  content: "";
  position: absolute;
  inset: -25%;
  z-index: -1;
  background: url("assets/sect-preview/entrance-gold.png") center / contain no-repeat;
  border-radius: inherit;
  pointer-events: none;
}
.entry-gateway-button > span { position: absolute; inset: 0; display: grid; place-content: center; transform-origin: center; transition: transform .2s ease; }
.entry-gateway-button:hover > span,
.entry-gateway-button:focus-visible > span { transform: scale(1.12); }
.entry-gateway-button svg { position: absolute; left: 50%; bottom: calc(3% + 4px); transform: translateX(-50%); width: 24px; height: 24px; color: #fffef0; filter: drop-shadow(0 1px 2px rgba(143, 80, 12, .35)); }
.entry-gateway-button:hover { filter: brightness(1.08); }
.entry-gateway-button:active { filter: brightness(.98); }
.entry-gateway-button:focus-visible { outline: 3px solid #fff; outline-offset: 19px; }
#classes .sect-preview-controls { bottom: calc(var(--entry-button-size) + 42px); }
@media (min-width: 981px) {
  #classes .sect-preview-controls { display: none; }
}
@media (max-width: 980px) {
  #classes { --entry-button-size: 104px; }
  #classes .entry-gateway { display: block; }
  .entry-gateway-button { padding: 10px; gap: 2px; font-size: 28px; }
  .entry-gateway-button svg { width: 14px; height: 14px; }
  #classes .sect-preview-controls { bottom: 0; }
  #classes .sect-preview-mobile-picker { bottom: 52px; }
  #classes .sect-preview-info-copy { bottom: 170px; }
}
@media (prefers-reduced-motion: reduce) {
  .entry-gateway-button, .entry-gateway-button > span { transition: none; }
}