:root {
  color-scheme: light;
  --warm-white: #f7f4ec;
  --paper: #eee9de;
  --ink: #27332f;
  --ink-soft: #53615b;
  --sage: #60766a;
  --sage-deep: #40584d;
  --cinnabar: #91685c;
  --warm-text: #fff6e8;
  --warm-text-muted: rgba(255, 246, 232, 0.72);
  --glass-fill: rgba(255, 255, 255, 0.045);
  --glass-fill-strong: rgba(255, 255, 255, 0.1);
  --glass-line: rgba(255, 255, 255, 0.42);
  --glass-shadow: 0 18px 54px rgba(14, 25, 21, 0.2);
  --glass-blur: 22px;
  --ease-quiet: cubic-bezier(0.22, 0.75, 0.26, 1);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: #dce5e3;
  scroll-behavior: smooth;
}

body {
  min-height: 100svh;
  margin: 0;
  overflow: hidden;
  color: var(--warm-text);
  font-family: "FangSong", "STFangsong", "Songti SC", serif;
  text-rendering: optimizeLegibility;
}

body::selection {
  background: rgba(96, 118, 106, 0.24);
}

a,
button {
  color: inherit;
  font: inherit;
}

button {
  border: 0;
}

.home-scene,
.home-scene-image,
.paper-grain {
  position: fixed;
  inset: 0;
}

.home-scene {
  z-index: -1;
  overflow: hidden;
  background: #24312d;
}

.home-scene::before {
  content: "";
  position: absolute;
  inset: -24px;
  background-image: var(--home-media-url, url("assets/snow-mountain-study-hero-v4.png"));
  background-position: center;
  background-size: cover;
  filter: blur(18px) brightness(0.72) saturate(0.82);
  transform: scale(1.04);
}

.home-scene-image {
  background-image: var(--home-media-url, url("assets/snow-mountain-study-hero-v4.png"));
  background-position: center center;
  background-size: contain;
  background-repeat: no-repeat;
  filter: none;
}

.home-scene-video,
.scene-background-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.home-scene-video {
  z-index: 0;
}

.home-scene.is-video::before,
.home-scene.is-video .home-scene-image {
  display: none;
}

.paper-grain {
  opacity: 0.035;
  mix-blend-mode: soft-light;
  background-image:
    repeating-linear-gradient(8deg, rgba(64, 78, 71, 0.1) 0, rgba(64, 78, 71, 0.1) 1px, transparent 1px, transparent 8px),
    repeating-linear-gradient(99deg, rgba(255, 255, 255, 0.15) 0, rgba(255, 255, 255, 0.15) 1px, transparent 1px, transparent 12px);
  animation: grain-drift 20s ease-in-out infinite alternate;
}

.glass-window {
  border: 1px solid var(--glass-line);
  border-radius: 20px;
  background: linear-gradient(135deg, var(--glass-fill-strong), var(--glass-fill));
  box-shadow: var(--glass-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(var(--glass-blur)) saturate(0.86);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(0.86);
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 18px;
  left: 24px;
  right: 24px;
  min-height: 70px;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 10px 12px 10px 14px;
  border-radius: 22px;
  animation: header-arrive 1s var(--ease-quiet) both;
}

.brand {
  min-width: 178px;
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--warm-text);
  text-decoration: none;
}

.brand-seal {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.055);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18);
  color: var(--warm-text);
}

.brand-seal svg {
  width: 31px;
  height: 31px;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.brand-seal circle {
  fill: currentColor;
  stroke: none;
}

.brand-copy {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.brand-copy strong {
  font-family: "STKaiti", "KaiTi", "FangSong", serif;
  font-size: 19px;
  font-weight: 500;
  white-space: nowrap;
}

.brand-copy small {
  color: rgba(255, 246, 232, 0.64);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 9px;
  letter-spacing: 0;
  white-space: nowrap;
}

.navigation-shell {
  min-width: 0;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-nav,
.account-actions {
  display: flex;
  align-items: center;
}

.site-nav {
  gap: 4px;
}

.site-nav a,
.account-link {
  position: relative;
  padding: 10px 13px;
  color: rgba(255, 246, 232, 0.78);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.5s var(--ease-quiet), background 0.5s var(--ease-quiet);
}

.site-nav a {
  border-radius: 12px;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 5px;
  height: 1px;
  background: rgba(255, 246, 232, 0.9);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.5s var(--ease-quiet);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--warm-text);
  background: rgba(255, 255, 255, 0.09);
}

.site-nav a:hover::after,
.site-nav a.active::after {
  transform: scaleX(1);
}

.account-actions {
  gap: 6px;
}

.account-link:hover {
  color: var(--warm-text);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.76);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.06);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 17px;
  height: 1px;
  margin: 4px auto;
  background: var(--warm-text);
  transition: transform 0.45s var(--ease-quiet), opacity 0.35s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.glass-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 44px;
  padding: 10px 22px;
  border: 1px solid rgba(255, 255, 255, 0.84);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.055);
  box-shadow: 0 10px 28px rgba(20, 33, 28, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.22);
  backdrop-filter: blur(18px) saturate(0.86);
  -webkit-backdrop-filter: blur(18px) saturate(0.86);
  cursor: pointer;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  text-decoration: none;
  transition: transform 0.6s var(--ease-quiet), background 0.6s var(--ease-quiet), box-shadow 0.6s var(--ease-quiet), color 0.6s var(--ease-quiet);
}

.glass-button:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.13);
  box-shadow: 0 15px 34px rgba(20, 33, 28, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.glass-button:focus-visible,
.site-nav a:focus-visible,
.brand:focus-visible,
.account-link:focus-visible,
.menu-toggle:focus-visible {
  outline: 2px solid rgba(255, 246, 232, 0.82);
  outline-offset: 4px;
}

.register-button {
  min-height: 40px;
  padding: 8px 17px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--warm-text);
  font-size: 13px;
  border-radius: 16px;
}

.register-button:hover {
  background: rgba(255, 255, 255, 0.15);
}

.return-button {
  min-height: 40px;
  padding: 8px 17px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--warm-text);
  font-size: 13px;
}

.return-arrow {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  transition: transform 0.55s var(--ease-quiet);
}

.return-button:hover .return-arrow {
  transform: translateX(-3px);
}

.home-hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 122px 7.5% 104px;
  text-align: center;
}

.hero-copy {
  width: min(700px, 100%);
  margin: -8vh auto 0;
  animation: hero-arrive 1.35s 0.16s var(--ease-quiet) both;
}

.hero-kicker {
  margin: 0 0 17px;
  color: var(--warm-text-muted);
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 16px;
}

.hero-copy h1 {
  margin: 0;
  color: var(--warm-text);
  font-family: "STZhongsong", "华文中宋", "STSong", "华文宋体", "SimSun", serif;
  font-size: 96px;
  font-weight: 700;
  font-variation-settings: normal;
  font-feature-settings: "palt" 1;
  line-height: 1.08;
  letter-spacing: 0;
  text-shadow: 0 3px 22px rgba(13, 28, 23, 0.5);
}

.hero-description {
  margin: 21px 0 0;
  color: rgba(255, 246, 232, 0.84);
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 21px;
  line-height: 1.7;
  text-shadow: 0 2px 14px rgba(13, 28, 23, 0.48);
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.primary-action {
  min-width: 150px;
  min-height: 50px;
  font-size: 15px;
}

.primary-action {
  min-width: 178px;
  min-height: 54px;
  border-color: rgba(255, 255, 255, 0.52);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.065);
  color: var(--warm-text);
  box-shadow: 0 14px 40px rgba(14, 28, 23, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.24);
  backdrop-filter: blur(24px) saturate(0.92);
  -webkit-backdrop-filter: blur(24px) saturate(0.92);
}

.primary-action:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--warm-text);
}

.button-arrow {
  font-family: Georgia, serif;
  font-size: 18px;
  transition: transform 0.55s var(--ease-quiet);
}

.primary-action:hover .button-arrow {
  transform: translateX(4px);
}

.room-presence {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 18px;
  min-height: 68px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 13px;
  padding: 12px 17px;
  border-color: rgba(255, 255, 255, 0.52);
  border-radius: 20px;
  background: transparent;
  box-shadow: 0 10px 28px rgba(14, 28, 23, 0.1);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  animation: presence-arrive 1.1s 0.3s var(--ease-quiet) both;
}

.presence-dot {
  width: 9px;
  height: 9px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  background: rgba(96, 166, 232, 0.96);
  box-shadow: 0 0 0 7px rgba(139, 198, 248, 0.18);
  animation: presence-pulse 4.5s ease-in-out infinite;
}

.presence-copy {
  min-width: 0;
  display: grid;
  gap: 3px;
}

.presence-copy strong {
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 15px;
  font-weight: 500;
}

.presence-copy small {
  overflow: hidden;
  color: rgba(255, 246, 232, 0.68);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.room-presence time {
  color: rgba(255, 246, 232, 0.74);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.quiet-toast {
  position: fixed;
  z-index: 40;
  left: 50%;
  bottom: 105px;
  max-width: min(420px, calc(100% - 32px));
  padding: 12px 18px;
  color: rgba(255, 246, 232, 0.88);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 13px;
  border-radius: 16px;
  pointer-events: none;
  opacity: 0;
  transform: translate(-50%, 12px);
  transition: opacity 0.55s var(--ease-quiet), transform 0.55s var(--ease-quiet);
}

.quiet-toast.visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.scene-page {
  overflow-x: hidden;
  overflow-y: auto;
}

.scene-selection-background::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(12, 24, 22, 0.2), rgba(12, 24, 22, 0.28) 56%, rgba(12, 24, 22, 0.5));
}

.scene-selection-main {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-content: center;
  gap: 34px;
  padding: 126px 5.5% 46px;
}

.scene-selection-copy {
  width: min(760px, 100%);
  margin: 0 auto;
  text-align: center;
  animation: hero-arrive 1.15s 0.12s var(--ease-quiet) both;
}

.scene-selection-copy h1 {
  margin: 0;
  color: var(--warm-text);
  font-family: "STZhongsong", "华文中宋", "STSong", "华文宋体", "SimSun", serif;
  font-size: 54px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0;
  text-shadow: 0 3px 20px rgba(13, 28, 23, 0.54);
}

.scene-intro {
  margin: 15px 0 0;
  color: rgba(255, 246, 232, 0.78);
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 18px;
  text-shadow: 0 2px 14px rgba(13, 28, 23, 0.48);
}

.scene-picker {
  width: min(1100px, 100%);
  margin: 0 auto;
  animation: presence-arrive 1.1s 0.28s var(--ease-quiet) both;
}

.scene-track {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 15px;
}

.scene-card {
  position: relative;
  min-width: 0;
  aspect-ratio: 1.55;
  overflow: hidden;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.48);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.04);
  box-shadow: 0 15px 38px rgba(8, 21, 18, 0.18);
  color: var(--warm-text);
  cursor: pointer;
  text-align: left;
  transform: translateY(0);
  transition: transform 0.65s var(--ease-quiet), border-color 0.55s var(--ease-quiet), box-shadow 0.65s var(--ease-quiet);
}

.scene-card:hover,
.scene-card.is-selected {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 22px 48px rgba(8, 21, 18, 0.28), inset 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.scene-card:focus-visible {
  outline: 2px solid rgba(255, 246, 232, 0.88);
  outline-offset: 4px;
}

.scene-card-image,
.scene-card-shade {
  position: absolute;
  inset: 0;
}

.scene-card-image {
  background-repeat: no-repeat;
  background-size: cover;
  transition: transform 1.2s var(--ease-quiet), filter 0.8s var(--ease-quiet);
}

.scene-card:hover .scene-card-image,
.scene-card.is-selected .scene-card-image {
  transform: scale(1.035);
}

.scene-snow {
  background-image: url("assets/snow-mountain-study-hero-v4.png");
  background-position: center 46%;
}

.scene-books {
  background-image: url("assets/warm-study-background.jpg");
  background-position: 68% center;
  filter: brightness(0.76) saturate(0.72);
}

.scene-pines {
  background-image: url("assets/snow-mountain-study-hero-v4.png");
  background-position: 4% 35%;
  filter: brightness(0.7) saturate(0.8);
  transform: scale(1.12);
}

.scene-card:hover .scene-pines,
.scene-card.is-selected .scene-pines {
  transform: scale(1.15);
}

.scene-card-shade {
  background: linear-gradient(180deg, rgba(11, 24, 21, 0.02) 24%, rgba(11, 24, 21, 0.76) 100%);
}

.scene-card-copy {
  position: absolute;
  right: 22px;
  bottom: 20px;
  left: 22px;
  display: grid;
  gap: 5px;
  text-shadow: 0 2px 12px rgba(10, 22, 19, 0.68);
}

.scene-card-copy small {
  color: rgba(255, 246, 232, 0.62);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 11px;
}

.scene-card-copy strong {
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 23px;
  font-weight: 500;
}

.scene-card-copy span {
  color: rgba(255, 246, 232, 0.68);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 11px;
}

.scene-selected-mark {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.82);
  border-radius: 50%;
  background: rgba(24, 43, 38, 0.24);
  font-family: "Microsoft YaHei", sans-serif;
  font-size: 13px;
  opacity: 0;
  transform: scale(0.76);
  transition: opacity 0.45s var(--ease-quiet), transform 0.45s var(--ease-quiet);
}

.scene-card.is-selected .scene-selected-mark {
  opacity: 1;
  transform: scale(1);
}

.scene-confirmation {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 15px;
  padding: 9px 10px 9px 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.035);
}

.selected-scene-copy {
  min-width: 0;
  display: flex;
  align-items: baseline;
  gap: 11px;
}

.selected-scene-copy small {
  color: rgba(255, 246, 232, 0.62);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 11px;
}

.selected-scene-copy strong {
  overflow: hidden;
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 18px;
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.scene-enter-button {
  min-height: 46px;
  flex: 0 0 auto;
  padding: 9px 20px;
  border-radius: 17px;
  font-size: 13px;
}

.scene-confirmation-enter {
  width: 50px;
  height: 50px;
  min-height: 50px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.76);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.035);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16);
  color: var(--warm-text);
  cursor: pointer;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 22px;
  transition: transform 0.42s var(--ease-quiet), background 0.42s var(--ease-quiet), border-color 0.42s var(--ease-quiet);
}

.scene-confirmation-enter:hover {
  transform: translateX(2px);
  border-color: rgba(255, 255, 255, 0.96);
  background: rgba(255, 255, 255, 0.12);
}

@keyframes grain-drift {
  from { transform: translate3d(-0.2%, -0.15%, 0); }
  to { transform: translate3d(0.2%, 0.15%, 0); }
}

@keyframes header-arrive {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes hero-arrive {
  from { opacity: 0; transform: translateY(18px); filter: blur(5px); }
  to { opacity: 1; transform: translateY(0); filter: blur(0); }
}

@keyframes presence-arrive {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes presence-pulse {
  0%, 100% { opacity: 0.66; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1); }
}

@media (max-width: 1040px) {
  .site-header {
    gap: 12px;
  }

  .brand {
    min-width: 158px;
  }

  .site-nav a {
    padding-right: 8px;
    padding-left: 8px;
    font-size: 12px;
  }

  .site-nav a::after {
    left: 8px;
    right: 8px;
  }

  .account-link {
    padding-right: 8px;
    padding-left: 8px;
  }

  .hero-copy {
    width: min(680px, 100%);
  }
}

@media (max-width: 820px), (min-width: 821px) and (max-width: 1024px) and (orientation: portrait) {
  .site-header {
    top: 12px;
    left: 12px;
    right: 12px;
    min-height: 62px;
    justify-content: space-between;
    padding: 9px 10px;
  }

  .brand {
    min-width: 0;
  }

  .brand-seal {
    width: 38px;
    height: 38px;
    flex-basis: 38px;
    font-size: 19px;
  }

  .brand-copy strong {
    font-size: 18px;
  }

  .menu-toggle {
    display: block;
  }

  .navigation-shell {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    display: grid;
    gap: 8px;
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, 0.78);
    border-radius: 20px;
    background: rgba(18, 31, 27, 0.3);
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(26px) saturate(0.88);
    -webkit-backdrop-filter: blur(26px) saturate(0.88);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.45s var(--ease-quiet), visibility 0.45s, transform 0.45s var(--ease-quiet);
  }

  .site-header.nav-open .navigation-shell {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 3px;
  }

  .site-nav a,
  .account-link {
    padding: 11px 10px;
  }

  .site-nav a:last-child {
    grid-column: 1 / -1;
  }

  .account-actions {
    justify-content: flex-end;
    border-top: 1px solid rgba(255, 255, 255, 0.58);
    padding-top: 8px;
  }

  .home-hero {
    align-items: center;
    padding: 142px 28px 104px;
  }

  .home-scene-image {
    background-size: cover;
  }

  .hero-copy {
    width: min(560px, 100%);
    margin-top: -6vh;
  }

  .hero-copy h1 {
    font-size: 72px;
  }

  .scene-selection-main {
    align-content: start;
    gap: 26px;
    padding: 114px 18px 36px;
  }

  .scene-selection-copy h1 {
    font-size: 44px;
  }

  .scene-track {
    grid-template-columns: 1fr;
    width: min(580px, 100%);
    margin: 0 auto;
  }

  .scene-card {
    aspect-ratio: 2.25;
  }

  .scene-confirmation {
    width: min(580px, 100%);
    margin-right: auto;
    margin-left: auto;
  }
}

@media (max-width: 560px) {
  .brand-copy small {
    display: none;
  }

  .home-hero {
    padding: 116px 18px 98px;
  }

  .hero-copy {
    margin-top: -4vh;
  }

  .hero-kicker {
    margin-bottom: 12px;
    font-size: 13px;
  }

  .hero-copy h1 {
    font-size: 58px;
  }

  .hero-description {
    max-width: 300px;
    margin-top: 16px;
    font-size: 17px;
  }

  .hero-actions {
    gap: 9px;
    margin-top: 27px;
  }

  .primary-action {
    min-width: 0;
    min-height: 46px;
    padding: 9px 17px;
    font-size: 13px;
  }

  .room-presence {
    left: 12px;
    right: 12px;
    bottom: 12px;
    min-height: 62px;
    padding: 10px 13px;
  }

  .quiet-toast {
    bottom: 88px;
  }

  .scene-selection-main {
    gap: 22px;
    padding: 104px 12px 24px;
  }

  .scene-selection-copy .hero-kicker {
    margin-bottom: 10px;
  }

  .scene-selection-copy h1 {
    font-size: 36px;
  }

  .scene-intro {
    margin-top: 10px;
    font-size: 15px;
  }

  .scene-track {
    gap: 10px;
  }

  .scene-card {
    aspect-ratio: 1.85;
    border-radius: 17px;
  }

  .scene-card-copy {
    right: 17px;
    bottom: 15px;
    left: 17px;
  }

  .scene-card-copy strong {
    font-size: 20px;
  }

  .scene-confirmation {
    min-height: 58px;
    gap: 10px;
    margin-top: 10px;
    padding-left: 14px;
    border-radius: 17px;
  }

  .selected-scene-copy {
    display: grid;
    gap: 2px;
  }

  .selected-scene-copy strong {
    font-size: 16px;
  }

  .scene-enter-button {
    min-height: 42px;
    padding: 8px 14px;
  }
}

@media (max-width: 370px) {
  .hero-copy h1 {
    font-size: 46px;
  }

  .hero-actions {
    display: flex;
    width: min(240px, 100%);
    margin-right: auto;
    margin-left: auto;
  }

  .room-presence time {
    display: none;
  }
}

/* Layered scene carousel */
.scene-selection-background::before {
  display: none;
}

.scene-background-layer {
  position: absolute;
  z-index: 0;
  inset: 0;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  opacity: 0;
  transform: scale(1.025);
  transition: opacity 1.4s var(--ease-quiet), transform 5.5s ease-out;
}

.scene-background-layer.is-visible {
  opacity: 1;
  transform: scale(1);
}

.scene-background-video {
  z-index: 0;
  opacity: 0;
  transform: scale(1.025);
  transition: opacity 1.4s var(--ease-quiet), transform 5.5s ease-out;
}

.scene-background-video.is-visible {
  opacity: 1;
  transform: scale(1);
}

.scene-selection-background .paper-grain {
  z-index: 2;
}

.scene-selection-background::after {
  z-index: 1;
  background: linear-gradient(180deg, rgba(9, 19, 18, 0.3), rgba(9, 19, 18, 0.36) 52%, rgba(9, 19, 18, 0.58));
}

.scene-selection-main {
  align-content: center;
  gap: 16px;
  padding: 100px 5.5% 18px;
}

.scene-selection-copy h1 {
  font-size: 48px;
}

.scene-intro {
  margin-top: 11px;
}

.scene-picker {
  width: min(1180px, 100%);
}

.scene-track {
  position: relative;
  width: 100%;
  height: clamp(270px, 30vw, 360px);
  display: block;
  overflow: hidden;
  perspective: 1500px;
  transform-style: preserve-3d;
}

.scene-card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: clamp(330px, 39vw, 500px);
  min-width: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.54);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.04);
  box-shadow: 0 20px 52px rgba(5, 15, 14, 0.3);
  color: var(--warm-text);
  cursor: pointer;
  text-align: left;
  will-change: transform, opacity;
  transition: transform 1s var(--ease-quiet), opacity 0.8s var(--ease-quiet), filter 0.8s var(--ease-quiet), border-color 0.6s var(--ease-quiet), box-shadow 0.8s var(--ease-quiet);
}

.scene-card[data-position="center"] {
  z-index: 7;
  opacity: 1;
  transform: translate(-50%, -50%) translateZ(50px) scale(1);
  border-color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 28px 64px rgba(5, 15, 14, 0.42), inset 0 0 0 1px rgba(255, 255, 255, 0.18);
  filter: brightness(1);
}

.scene-card[data-position="left-1"] {
  z-index: 6;
  opacity: 0.88;
  transform: translate(-50%, -50%) translateX(-52%) translateZ(10px) rotateY(4deg) scale(0.82);
  filter: brightness(0.8) saturate(0.84);
}

.scene-card[data-position="right-1"] {
  z-index: 6;
  opacity: 0.88;
  transform: translate(-50%, -50%) translateX(52%) translateZ(10px) rotateY(-4deg) scale(0.82);
  filter: brightness(0.8) saturate(0.84);
}

.scene-card[data-position="left-2"] {
  z-index: 5;
  opacity: 0.58;
  transform: translate(-50%, -50%) translateX(-92%) translateZ(-70px) rotateY(7deg) scale(0.66);
  filter: brightness(0.64) saturate(0.72);
}

.scene-card[data-position="right-2"] {
  z-index: 5;
  opacity: 0.58;
  transform: translate(-50%, -50%) translateX(92%) translateZ(-70px) rotateY(-7deg) scale(0.66);
  filter: brightness(0.64) saturate(0.72);
}

.scene-card[data-position="left-3"],
.scene-card[data-position="right-3"] {
  z-index: 4;
  opacity: 0;
  pointer-events: none;
  filter: brightness(0.5);
}

.scene-card[data-position="left-3"] {
  transform: translate(-50%, -50%) translateX(-128%) translateZ(-120px) scale(0.52);
}

.scene-card[data-position="right-3"] {
  transform: translate(-50%, -50%) translateX(128%) translateZ(-120px) scale(0.52);
}

.scene-card:not(.is-selected):hover {
  border-color: rgba(255, 255, 255, 0.78);
  filter: brightness(0.92) saturate(0.9);
}

.scene-card-image {
  background-position: center;
  transform: scale(1.02);
  transition: transform 1.4s var(--ease-quiet);
}

.scene-card-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scene-card[data-position^="left-"]:not([data-position="left-1"]):not([data-position="left-2"]),
.scene-card[data-position^="right-"]:not([data-position="right-1"]):not([data-position="right-2"]) {
  z-index: 4;
  opacity: 0;
  pointer-events: none;
}

.scene-card.is-selected .scene-card-image {
  transform: scale(1);
}

.scene-card-copy {
  bottom: 18px;
  transition: opacity 0.55s var(--ease-quiet);
}

.scene-card-copy strong {
  font-size: 24px;
}

.scene-card:not(.is-selected) .scene-card-copy,
.scene-card:not(.is-selected) .scene-selected-mark {
  opacity: 0;
}

.scene-confirmation {
  width: min(900px, calc(100% - 64px));
  margin: -2px auto 0;
}

@media (max-width: 820px) {
  .scene-selection-main {
    align-content: start;
    gap: 16px;
    padding: 106px 18px 30px;
  }

  .scene-selection-copy h1 {
    font-size: 44px;
  }

  .scene-track {
    height: 320px;
  }

  .scene-card {
    width: min(68vw, 500px);
  }

  .scene-confirmation {
    width: min(580px, calc(100% - 24px));
  }
}

@media (max-width: 560px) {
  .scene-selection-main {
    gap: 12px;
    padding: 98px 12px 22px;
  }

  .scene-selection-copy h1 {
    font-size: 36px;
  }

  .scene-track {
    height: 250px;
  }

  .scene-card {
    width: min(78vw, 330px);
    border-radius: 17px;
  }

  .scene-card[data-position="left-1"] {
    transform: translate(-50%, -50%) translateX(-50%) translateZ(8px) rotateY(3deg) scale(0.8);
  }

  .scene-card[data-position="right-1"] {
    transform: translate(-50%, -50%) translateX(50%) translateZ(8px) rotateY(-3deg) scale(0.8);
  }

  .scene-card[data-position="left-2"] {
    transform: translate(-50%, -50%) translateX(-85%) translateZ(-60px) scale(0.64);
  }

  .scene-card[data-position="right-2"] {
    transform: translate(-50%, -50%) translateX(85%) translateZ(-60px) scale(0.64);
  }

  .scene-card-copy {
    right: 17px;
    bottom: 15px;
    left: 17px;
  }

  .scene-card-copy strong {
    font-size: 20px;
  }

  .scene-confirmation {
    width: 100%;
    margin-top: 0;
  }
}

@media (max-width: 370px) {
  .scene-track {
    height: 225px;
  }

  .scene-card {
    width: min(82vw, 300px);
  }
}

.scene-workspace {
  width: min(1400px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  align-items: stretch;
  gap: 18px;
}

.scene-workspace .scene-picker {
  width: 100%;
  min-width: 0;
}

.study-settings {
  min-width: 0;
  padding: 17px;
  border-color: rgba(255, 255, 255, 0.54);
  border-radius: 22px;
  background: rgba(10, 24, 21, 0.12);
  box-shadow: 0 18px 48px rgba(5, 15, 14, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(18px) saturate(0.86);
  -webkit-backdrop-filter: blur(18px) saturate(0.86);
  animation: presence-arrive 1.1s 0.38s var(--ease-quiet) both;
}

.settings-header {
  min-height: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.settings-header h2,
.setting-section h3 {
  margin: 0;
  color: var(--warm-text);
  font-weight: 500;
}

.settings-header h2 {
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 20px;
}

.settings-status-dot {
  width: 8px;
  height: 8px;
  border: 1px solid rgba(255, 255, 255, 0.82);
  border-radius: 50%;
  background: rgba(105, 171, 231, 0.94);
  box-shadow: 0 0 0 6px rgba(105, 171, 231, 0.13);
}

.setting-section {
  margin-top: 13px;
  padding-top: 13px;
  border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.setting-section h3 {
  margin-bottom: 9px;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 12px;
}

.setting-option-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
}

.setting-option {
  min-width: 0;
  min-height: 34px;
  overflow: hidden;
  padding: 6px 8px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.025);
  color: rgba(255, 246, 232, 0.72);
  cursor: pointer;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 11px;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color 0.45s var(--ease-quiet), background 0.45s var(--ease-quiet), border-color 0.45s var(--ease-quiet), transform 0.45s var(--ease-quiet);
}

.setting-option:hover {
  color: var(--warm-text);
  border-color: rgba(255, 255, 255, 0.64);
  background: rgba(255, 255, 255, 0.08);
}

.setting-option.is-selected {
  color: var(--warm-text);
  border-color: rgba(255, 255, 255, 0.84);
  background: rgba(255, 255, 255, 0.13);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16);
}

.add-setting-option {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.add-symbol {
  font-family: Arial, sans-serif;
  font-size: 15px;
  line-height: 1;
}

.inline-setting-form {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
}

.inline-setting-form[hidden] {
  display: none !important;
}

.inline-setting-form input {
  width: 100%;
  min-width: 0;
  height: 34px;
  padding: 6px 9px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 11px;
  outline: 0;
  background: rgba(7, 19, 16, 0.16);
  color: var(--warm-text);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 11px;
}

.inline-setting-form input::placeholder {
  color: rgba(255, 246, 232, 0.48);
}

.inline-setting-form input:focus {
  border-color: rgba(255, 255, 255, 0.84);
  background: rgba(255, 255, 255, 0.07);
}

.inline-setting-form span {
  flex: 0 0 auto;
  color: rgba(255, 246, 232, 0.66);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 10px;
}

.inline-setting-form button {
  min-height: 34px;
  flex: 0 0 auto;
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.68);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--warm-text);
  cursor: pointer;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 11px;
}

.settings-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 13px;
  padding-top: 13px;
  border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.settings-summary > span {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.settings-summary small {
  color: rgba(255, 246, 232, 0.5);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 9px;
}

.settings-summary strong {
  overflow: hidden;
  color: var(--warm-text);
  font-family: "STKaiti", "KaiTi", serif;
  font-size: 14px;
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.setting-option:focus-visible,
.inline-setting-form input:focus-visible,
.inline-setting-form button:focus-visible {
  outline: 2px solid rgba(255, 246, 232, 0.82);
  outline-offset: 3px;
}

@media (max-width: 980px) {
  .scene-workspace {
    grid-template-columns: 1fr;
  }

  .study-settings {
    width: min(580px, 100%);
    margin: 0 auto;
  }
}

@media (min-width: 981px) and (min-height: 700px) {
  .scene-page {
    overflow-y: hidden;
  }
}

@media (max-width: 560px) {
  .scene-workspace {
    gap: 12px;
  }

  .study-settings {
    padding: 15px;
    border-radius: 18px;
  }

  .setting-option {
    min-height: 36px;
  }
}

.scene-workspace {
  grid-template-columns: minmax(0, 1fr) 72px;
  gap: 14px;
}

.settings-rail {
  position: relative;
  width: 72px;
  min-width: 72px;
  min-height: 0;
  align-self: center;
  justify-self: end;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 10px 8px;
  overflow: visible;
  border-radius: 34px;
  background: rgba(8, 22, 19, 0.09);
  backdrop-filter: blur(16px) saturate(0.84);
  -webkit-backdrop-filter: blur(16px) saturate(0.84);
}

.settings-rail-section {
  position: relative;
  width: 100%;
}

.settings-icon-stack,
.settings-time-stack {
  display: grid;
  justify-items: center;
}

.settings-icon-stack {
  gap: 5px;
}

.settings-time-stack {
  gap: 2px;
}

.rail-option,
.rail-time,
.rail-enter-button {
  position: relative;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.46);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.025);
  color: rgba(255, 246, 232, 0.78);
  cursor: pointer;
  line-height: 1;
  transition: color 0.42s var(--ease-quiet), background 0.42s var(--ease-quiet), border-color 0.42s var(--ease-quiet), transform 0.42s var(--ease-quiet), box-shadow 0.42s var(--ease-quiet);
}

.rail-option {
  width: 32px;
  height: 32px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 16px;
}

.rail-time {
  width: 40px;
  height: 23px;
  border-color: transparent;
  border-radius: 12px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.rail-enter-button {
  width: 42px;
  height: 42px;
  margin-top: 1px;
  border-color: rgba(255, 255, 255, 0.68);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 21px;
}

.rail-option:hover,
.rail-time:hover,
.rail-enter-button:hover {
  color: var(--warm-text);
  border-color: rgba(255, 255, 255, 0.88);
  background: rgba(255, 255, 255, 0.11);
  transform: scale(1.06);
}

.rail-option.is-selected,
.rail-time.is-selected {
  color: var(--warm-text);
  border-color: rgba(255, 255, 255, 0.92);
  background: rgba(255, 255, 255, 0.15);
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.055), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.rail-divider {
  width: 34px;
  height: 1px;
  flex: 0 0 1px;
  background: rgba(255, 255, 255, 0.34);
}

.rail-option::after,
.rail-time::after,
.rail-enter-button::after {
  content: attr(data-tooltip);
  position: absolute;
  z-index: 30;
  top: 50%;
  right: calc(100% + 10px);
  width: max-content;
  max-width: 160px;
  padding: 6px 9px;
  border: 1px solid rgba(255, 255, 255, 0.38);
  border-radius: 9px;
  background: rgba(10, 24, 21, 0.76);
  box-shadow: 0 8px 22px rgba(4, 13, 11, 0.22);
  color: rgba(255, 246, 232, 0.88);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 10px;
  line-height: 1.35;
  pointer-events: none;
  opacity: 0;
  transform: translate(5px, -50%);
  transition: opacity 0.3s ease, transform 0.3s var(--ease-quiet);
  white-space: nowrap;
}

.rail-option:hover::after,
.rail-option:focus-visible::after,
.rail-time:hover::after,
.rail-time:focus-visible::after,
.rail-enter-button:hover::after,
.rail-enter-button:focus-visible::after {
  opacity: 1;
  transform: translate(0, -50%);
}

.settings-rail .inline-setting-form {
  position: absolute;
  z-index: 25;
  top: 50%;
  right: calc(100% + 13px);
  width: 190px;
  margin: 0;
  padding: 8px;
  border: 1px solid rgba(255, 255, 255, 0.46);
  border-radius: 14px;
  background: rgba(9, 23, 20, 0.72);
  box-shadow: 0 14px 34px rgba(4, 13, 11, 0.28);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transform: translateY(-50%);
}

.settings-rail .inline-setting-form input {
  height: 32px;
}

.settings-rail .inline-setting-form button {
  width: 32px;
  min-height: 32px;
  padding: 0;
  border-radius: 50%;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  clip-path: inset(50%) !important;
  white-space: nowrap !important;
}

.scene-track {
  --drag-x: 0px;
  cursor: grab;
  touch-action: pan-y;
  user-select: none;
  transform: translate3d(var(--drag-x), 0, 0);
  transition: transform 0.34s var(--ease-quiet);
}

.scene-track.is-dragging {
  cursor: grabbing;
  transition: none;
}

.scene-track.is-dragging .scene-card {
  pointer-events: none;
}

@media (max-width: 700px) {
  .scene-workspace {
    grid-template-columns: 1fr;
  }

  .settings-rail {
    width: 64px;
    min-width: 64px;
    justify-self: end;
    margin-right: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}