:root {
  --ink: #10252a;
  --muted-ink: #395d66;
  --paper: #f7f4ec;
  --glass: rgba(255, 255, 255, 0.58);
  --line: rgba(16, 37, 42, 0.14);
  --teal: #1d7c88;
  --teal-deep: #0f5f69;
  --sun: #de7d49;
  --shadow-lg: 0 18px 45px rgba(11, 42, 49, 0.17);
  --shadow-sm: 0 8px 18px rgba(11, 42, 49, 0.13);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  color: var(--ink);
  font-family: "Manrope", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 15% 15%, rgba(255, 226, 174, 0.56), transparent 33%),
    radial-gradient(circle at 84% 16%, rgba(158, 221, 215, 0.54), transparent 36%),
    radial-gradient(circle at 18% 92%, rgba(181, 212, 241, 0.52), transparent 32%),
    linear-gradient(130deg, #ecf6ef 0%, #e6f1f9 47%, #f7ece2 100%);
  overflow-x: hidden;
}

.site-atmosphere {
  position: fixed;
  inset: -100px;
  pointer-events: none;
  background:
    radial-gradient(circle at 80% 30%, rgba(255, 255, 255, 0.6), transparent 30%),
    radial-gradient(circle at 20% 75%, rgba(173, 221, 232, 0.28), transparent 35%);
  filter: blur(22px);
  animation: drift 20s ease-in-out infinite alternate;
  z-index: 0;
}

.brand-badge {
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 1rem;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.62);
  box-shadow: 0 16px 30px rgba(12, 40, 52, 0.2);
  backdrop-filter: blur(8px);
}

.brand-badge img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.home-brand {
  position: relative;
  z-index: 1;
  width: min(220px, 44vw);
  aspect-ratio: 1 / 1;
  margin: 0 auto 1rem;
}

.session-brand {
  width: min(160px, 45vw);
  aspect-ratio: 1 / 1;
  margin-bottom: 0.8rem;
}

.home-shell {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 1.4rem));
  margin: max(1.1rem, env(safe-area-inset-top)) auto
    max(2.2rem, env(safe-area-inset-bottom));
}

.top-entry-links {
  position: absolute;
  top: 0;
  right: 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
  justify-content: flex-end;
}

.science-entry-link,
.history-entry-link,
.about-entry-link,
.privacy-entry-link {
  text-decoration: none;
  border-radius: 999px;
  padding: 0.65rem 1rem;
  border: 1px solid rgba(21, 88, 95, 0.2);
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.93), rgba(242, 251, 250, 0.9));
  color: #15585f;
  font-size: 0.87rem;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, filter 0.15s ease;
}

.science-entry-link:hover,
.history-entry-link:hover,
.about-entry-link:hover,
.privacy-entry-link:hover {
  transform: translateY(-2px);
  filter: brightness(1.02);
}

.science-entry-link:focus-visible,
.history-entry-link:focus-visible,
.about-entry-link:focus-visible,
.privacy-entry-link:focus-visible {
  outline: 3px solid var(--sun);
  outline-offset: 2px;
}

.home-hero {
  max-width: 840px;
  margin: 0 auto 1.2rem;
  text-align: center;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted-ink);
}

h1 {
  margin: 0.35rem 0 0;
  font-family: "DM Serif Display", Georgia, serif;
  font-size: clamp(2.2rem, 5.7vw, 4.2rem);
  line-height: 1.04;
  color: #18535b;
  font-weight: 400;
}

.home-hero p {
  color: var(--muted-ink);
  font-size: clamp(0.96rem, 2.2vw, 1.14rem);
  line-height: 1.66;
}

.session-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.session-card {
  border: 1px solid var(--line);
  border-radius: 1.1rem;
  overflow: hidden;
  background: var(--glass);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
  padding-bottom: 1rem;
  transform: translateY(15px);
  opacity: 0;
  animation: rise 0.8s ease forwards;
}

.session-card:nth-child(2) {
  animation-delay: 0.05s;
}

.session-card:nth-child(3) {
  animation-delay: 0.1s;
}

.session-card:nth-child(4) {
  animation-delay: 0.15s;
}

.session-card:nth-child(5) {
  animation-delay: 0.2s;
}

.session-card:nth-child(6) {
  animation-delay: 0.25s;
}

.session-card:nth-child(7) {
  animation-delay: 0.3s;
}

.session-card:nth-child(8) {
  animation-delay: 0.35s;
}

.session-card:nth-child(9) {
  animation-delay: 0.4s;
}

.session-card:nth-child(10) {
  animation-delay: 0.45s;
}

.session-card:nth-child(11) {
  animation-delay: 0.5s;
}

.session-card:nth-child(12) {
  animation-delay: 0.55s;
}

.session-card h2 {
  margin: 0.9rem 1rem 0;
  font-family: "DM Serif Display", Georgia, serif;
  font-weight: 400;
  color: #154f56;
  font-size: 1.4rem;
}

.session-card p {
  margin: 0.46rem 1rem 0;
  color: var(--muted-ink);
  font-size: 0.95rem;
  line-height: 1.5;
  min-height: 2.8rem;
}

.open-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 0.95rem 1rem 0;
  text-decoration: none;
  border-radius: 999px;
  padding: 0.68rem 1rem;
  background: linear-gradient(120deg, var(--teal), #36a0a4);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, filter 0.15s ease;
}

.open-link:hover {
  transform: translateY(-2px);
  filter: brightness(1.03);
}

.open-link:focus-visible,
.control-btn:focus-visible,
.back-link:focus-visible {
  outline: 3px solid var(--sun);
  outline-offset: 2px;
}

.home-visual {
  height: 148px;
}

.v-rain {
  background:
    repeating-linear-gradient(
      112deg,
      rgba(255, 255, 255, 0.2) 0 2px,
      transparent 2px 8px
    ),
    linear-gradient(155deg, #36565d 0%, #5d858b 55%, #8caaa8 100%);
}

.v-ocean {
  background:
    radial-gradient(circle at 15% 10%, rgba(255, 243, 205, 0.95), transparent 40%),
    linear-gradient(185deg, #f7ca8f 0%, #9ed6da 45%, #72aebd 100%);
}

.v-forest {
  background:
    radial-gradient(circle at 25% 25%, rgba(252, 248, 182, 0.6) 0 2px, transparent 4px),
    radial-gradient(circle at 70% 50%, rgba(252, 248, 182, 0.45) 0 1px, transparent 4px),
    linear-gradient(170deg, #b8d6bd 0%, #7ca59a 58%, #4f746d 100%);
}

.v-night {
  background:
    radial-gradient(circle at 22% 30%, rgba(255, 252, 233, 0.88) 0 1.6px, transparent 4px),
    radial-gradient(circle at 70% 26%, rgba(255, 252, 233, 0.7) 0 1.1px, transparent 3px),
    linear-gradient(165deg, #1a333d 0%, #1f5662 54%, #3f7f84 100%);
}

.v-breath {
  background:
    radial-gradient(circle at center, rgba(255, 255, 255, 0.83) 0 24%, rgba(171, 222, 210, 0.75) 40%, transparent 75%),
    linear-gradient(150deg, #f3e6c9 0%, #c9e3d8 56%, #9ec8cb 100%);
}

.v-aurora {
  background:
    radial-gradient(100% 70% at 20% 70%, rgba(250, 178, 119, 0.48), transparent 75%),
    radial-gradient(100% 80% at 85% 30%, rgba(131, 232, 217, 0.5), transparent 65%),
    linear-gradient(165deg, #17363f 0%, #246672 65%, #3f8c95 100%);
}

.v-theta {
  background:
    repeating-radial-gradient(circle at center, rgba(238, 248, 246, 0.15) 0 14px, transparent 14px 27px),
    linear-gradient(150deg, #253f53 0%, #3d5d73 44%, #4a7f8d 100%);
}

.v-embers {
  background:
    radial-gradient(circle at 20% 65%, rgba(243, 139, 83, 0.64) 0 10%, transparent 28%),
    radial-gradient(circle at 72% 34%, rgba(255, 183, 84, 0.45) 0 8%, transparent 25%),
    linear-gradient(160deg, #3c3b45 0%, #63544d 50%, #8a6b56 100%);
}

.v-cloud {
  background:
    radial-gradient(circle at 40% 30%, rgba(246, 241, 255, 0.65) 0 20%, transparent 52%),
    radial-gradient(circle at 60% 62%, rgba(223, 230, 255, 0.58) 0 18%, transparent 45%),
    linear-gradient(150deg, #5d6f8d 0%, #7684a0 55%, #8ea5c6 100%);
}

.v-stream {
  background:
    radial-gradient(circle at 18% 70%, rgba(219, 243, 253, 0.55) 0 12%, transparent 35%),
    radial-gradient(circle at 78% 34%, rgba(195, 229, 245, 0.58) 0 10%, transparent 30%),
    linear-gradient(158deg, #2e5968 0%, #3a7885 52%, #65a5b1 100%);
}

.v-crystal {
  background:
    conic-gradient(
      from 40deg at 50% 50%,
      rgba(241, 252, 255, 0.5) 0deg,
      rgba(180, 231, 244, 0.4) 60deg,
      rgba(132, 187, 220, 0.5) 150deg,
      rgba(244, 254, 255, 0.45) 240deg,
      rgba(168, 225, 240, 0.42) 300deg,
      rgba(241, 252, 255, 0.5) 360deg
    ),
    linear-gradient(145deg, #406685 0%, #6f97b9 50%, #9ed2e2 100%);
}

.v-vortex {
  background:
    radial-gradient(circle at 48% 52%, rgba(11, 26, 41, 0.78) 0 11%, rgba(11, 26, 41, 0) 24%),
    radial-gradient(circle at 50% 50%, rgba(183, 226, 244, 0.28) 0 7%, rgba(183, 226, 244, 0) 20%),
    repeating-conic-gradient(
      from 18deg at 50% 50%,
      rgba(168, 219, 240, 0.36) 0deg 11deg,
      rgba(88, 150, 191, 0.18) 11deg 22deg,
      rgba(34, 76, 111, 0.05) 22deg 38deg
    ),
    radial-gradient(circle at 66% 30%, rgba(211, 241, 251, 0.22) 0 14%, rgba(211, 241, 251, 0) 44%),
    linear-gradient(162deg, #122337 0%, #1e3d5a 44%, #2b6580 100%);
}

.session-page {
  position: relative;
}

.site-footer {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--muted-ink);
  font-size: 0.86rem;
  padding: 0.4rem 1rem max(1rem, env(safe-area-inset-bottom));
}

.site-footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-bottom: 0.45rem;
}

.site-footer-link {
  color: #15585f;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.86rem;
  min-height: 44px;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(21, 88, 95, 0.2);
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.93), rgba(242, 251, 250, 0.9));
  display: inline-flex;
  align-items: center;
}

.site-footer-link:hover {
  filter: brightness(1.02);
}

.site-footer-link:focus-visible {
  outline: 3px solid var(--sun);
  outline-offset: 2px;
}

.site-footer p {
  margin: 0;
}

.session-shell {
  position: relative;
  z-index: 1;
  width: min(1150px, calc(100% - 1.2rem));
  margin: max(1rem, env(safe-area-inset-top)) auto max(1.5rem, env(safe-area-inset-bottom));
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(320px, 1.65fr);
  gap: 1rem;
  align-items: start;
}

.session-info,
.session-stage {
  border: 1px solid var(--line);
  border-radius: 1.1rem;
  background: var(--glass);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-lg);
  min-width: 0;
}

.session-info {
  position: relative;
  padding: 1rem;
}

.back-link {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--teal-deep);
  font-weight: 700;
  font-size: 0.88rem;
  min-height: 44px;
}

.session-title {
  margin: 0.55rem 0 0;
  font-family: "DM Serif Display", Georgia, serif;
  color: #17515a;
  font-weight: 400;
  font-size: clamp(1.9rem, 4.3vw, 2.8rem);
  line-height: 1.08;
}

.session-sub {
  margin: 0.6rem 0 0;
  color: var(--muted-ink);
  line-height: 1.58;
  font-size: 0.98rem;
}

.benefit-box {
  margin-top: 0.9rem;
  border-radius: 0.9rem;
  border: 1px solid rgba(22, 74, 78, 0.14);
  background: rgba(255, 255, 255, 0.5);
  padding: 0.8rem;
}

.benefit-box h2 {
  margin: 0;
  font-size: 1rem;
  color: #1a5a61;
}

.benefit-box p {
  margin: 0.5rem 0 0;
  font-size: 0.92rem;
  line-height: 1.56;
  color: var(--muted-ink);
}

.controls {
  margin-top: 1rem;
  display: grid;
  gap: 0.65rem;
}

.control-row {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.65rem;
}

.control-btn {
  border: 0;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--teal), #36a0a4);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  padding: 0.72rem 1rem;
  min-width: 145px;
  min-height: 44px;
  box-shadow: var(--shadow-sm);
}

.control-btn.is-running {
  background: linear-gradient(120deg, #cf7542, #c95e4e);
}

.countdown {
  border: 1px solid rgba(16, 37, 42, 0.18);
  border-radius: 0.7rem;
  font-family: "DM Serif Display", Georgia, serif;
  font-size: 1.4rem;
  text-align: center;
  padding: 0.2rem 0.5rem;
  color: #154f56;
  background: rgba(255, 255, 255, 0.57);
}

.status {
  min-height: 1.2rem;
  margin: 0;
  color: var(--muted-ink);
  font-size: 0.9rem;
}

.session-stage {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.video-label {
  margin: 0;
  padding: 0.8rem 0.9rem 0.6rem;
  color: var(--muted-ink);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 700;
}

#visual-canvas {
  display: block;
  width: 100%;
  height: clamp(260px, 62svh, 680px);
  background: #123038;
}

@keyframes drift {
  from {
    transform: translateX(-8px) translateY(-12px);
  }
  to {
    transform: translateX(9px) translateY(10px);
  }
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1160px) {
  .session-shell {
    grid-template-columns: minmax(260px, 1fr) minmax(320px, 1.45fr);
  }
}

@media (max-width: 980px) {
  .home-shell {
    width: min(1180px, calc(100% - 1rem));
  }

  .top-entry-links {
    position: static;
    display: flex;
    justify-content: flex-end;
    gap: 0.4rem;
    margin: 0 0 0.9rem auto;
  }

  .science-entry-link,
  .history-entry-link {
    margin: 0;
  }

  .session-shell {
    grid-template-columns: 1fr;
    width: min(1150px, calc(100% - 1rem));
    gap: 0.85rem;
  }

  #visual-canvas {
    height: clamp(250px, 50svh, 520px);
  }

  .session-info,
  .session-stage {
    border-radius: 1rem;
  }
}

@media (max-width: 768px) {
  .home-shell {
    margin-bottom: max(1.6rem, env(safe-area-inset-bottom));
  }

  .home-hero {
    margin-bottom: 0.9rem;
  }

  .session-grid {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  .home-visual {
    height: 168px;
  }

  .open-link {
    display: flex;
    width: calc(100% - 2rem);
    min-height: 44px;
  }

  .session-title {
    font-size: clamp(1.75rem, 7vw, 2.3rem);
  }

  .home-brand {
    width: min(190px, 52vw);
    margin-bottom: 0.75rem;
  }

  .session-brand {
    width: min(135px, 42vw);
    margin-bottom: 0.6rem;
  }
}

@media (max-width: 640px) {
  .home-shell {
    width: min(1180px, calc(100% - 0.7rem));
    margin-top: 0.8rem;
  }

  .session-card p {
    min-height: 0;
  }

  .session-info {
    padding: 0.85rem;
  }

  .control-row {
    grid-template-columns: 1fr;
  }

  .control-btn {
    width: 100%;
  }

  .countdown {
    width: 100%;
    min-height: 44px;
    display: grid;
    place-items: center;
  }

  #visual-canvas {
    height: clamp(220px, 44svh, 420px);
  }

  .site-footer {
    font-size: 0.8rem;
    padding-bottom: max(0.9rem, env(safe-area-inset-bottom));
  }
}

@media (hover: none) {
  .open-link:hover,
  .control-btn:hover {
    transform: none;
    filter: none;
  }
}

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