:root {
  color-scheme: dark;
  --bg: #171717;
  --ink: #f2f2ee;
  --muted: rgba(242, 242, 238, 0.58);
  --hair: rgba(242, 242, 238, 0.2);
  --panel: rgba(232, 232, 224, 0.9);
  --panel-ink: #171717;
  --accent: #d8d0bb;
  --radius: 0;
  font-family:
    "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", system-ui,
    sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  overflow: hidden;
}

button {
  font: inherit;
}

#field {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100dvh;
  opacity: 0.42;
  filter: grayscale(1) contrast(1.15);
  z-index: 0;
}

.site-shell {
  position: relative;
  z-index: 1;
  min-height: 100dvh;
  isolation: isolate;
}

.site-shell::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.032) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.026) 1px, transparent 1px);
  background-size: 8.333vw 100%, 8.333vw 100%;
  mix-blend-mode: screen;
  opacity: 0.42;
  pointer-events: none;
}

.topbar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 10;
  display: grid;
  grid-template-columns: 160px 1fr 120px;
  align-items: center;
  height: 64px;
  padding: 0 20px;
  color: rgba(255, 255, 255, 0.82);
}

.mark {
  color: inherit;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 28px;
}

.nav button,
.focus-button,
.bottom-control button {
  border: 0;
  color: inherit;
  background: transparent;
  cursor: pointer;
}

.nav button {
  padding: 8px 0;
  font-size: 14px;
  font-weight: 700;
  opacity: 0.78;
}

.nav button.is-active {
  opacity: 1;
}

.clock {
  justify-self: end;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
  font-variant-numeric: tabular-nums;
}

.stage {
  position: relative;
  min-height: 100dvh;
  overflow: hidden;
}

.media-stack {
  position: fixed;
  left: 50%;
  top: 47%;
  width: min(33vw, 460px);
  aspect-ratio: 0.78;
  transform: translate(-50%, -50%);
  perspective: 900px;
}

.visual-card {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: #dad8d0;
  color: var(--panel-ink);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.34);
  will-change: transform, filter, opacity;
}

.visual-card img {
  display: block;
  width: 100%;
  height: 62%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.05);
}

.visual-card .caption {
  min-height: 38%;
  padding: 28px 26px 24px;
  background: var(--panel);
  color: var(--panel-ink);
}

.visual-card h3 {
  margin: 0 0 24px;
  font-size: clamp(26px, 4vw, 58px);
  line-height: 0.9;
  letter-spacing: -0.06em;
  font-weight: 500;
}

.visual-card p {
  margin: 0;
  max-width: 35ch;
  font-size: 12px;
  line-height: 1.65;
}

.visual-card .line {
  display: flex;
  align-items: end;
  gap: 12px;
  margin-top: 28px;
  font-size: clamp(28px, 4vw, 64px);
  letter-spacing: -0.07em;
  line-height: 0.8;
}

.visual-card .line::before {
  content: "";
  flex: 1 1 auto;
  height: 2px;
  margin-bottom: 0.15em;
  background: currentColor;
}

.thumb-rail {
  position: fixed;
  top: 46%;
  right: 9.5vw;
  display: grid;
  gap: 10px;
  transform: translateY(-50%);
  z-index: 4;
}

.thumb {
  width: 76px;
  aspect-ratio: 0.72;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background-size: cover;
  background-position: center;
  filter: grayscale(1) contrast(1.08);
  opacity: 0.36;
}

.thumb.is-active {
  opacity: 1;
  outline: 1px solid rgba(255, 255, 255, 0.55);
}

.copy-panel {
  position: fixed;
  left: 6vw;
  top: 18vh;
  width: min(27vw, 390px);
  z-index: 5;
  color: var(--ink);
  opacity: 0.92;
}

.kicker {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 13px;
}

.copy-panel h1 {
  margin: 0 0 28px;
  font-size: clamp(34px, 4.6vw, 76px);
  line-height: 0.92;
  letter-spacing: -0.07em;
  font-weight: 500;
}

.copy-scroll {
  max-height: 34vh;
  overflow: auto;
  padding-right: 14px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
  line-height: 1.95;
  scrollbar-width: thin;
}

.copy-scroll p {
  margin: 0 0 1.05em;
}

.mass-title {
  position: fixed;
  left: 18px;
  bottom: -12px;
  z-index: 2;
  width: min(48vw, 700px);
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(58px, 7vw, 116px);
  font-weight: 400;
  line-height: 0.84;
  letter-spacing: -0.07em;
  pointer-events: none;
}

.bottom-control {
  position: fixed;
  left: 50%;
  bottom: 22px;
  z-index: 8;
  display: grid;
  grid-template-columns: 92px 1fr 92px;
  align-items: center;
  width: min(360px, calc(100vw - 40px));
  min-height: 38px;
  padding: 4px;
  transform: translateX(-50%);
  background: rgba(8, 8, 8, 0.86);
  color: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  backdrop-filter: blur(18px);
}

.bottom-control button {
  height: 30px;
  color: rgba(255, 255, 255, 0.72);
}

#pageCount {
  text-align: center;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.focus-button {
  position: fixed;
  right: 16px;
  bottom: 24px;
  z-index: 9;
  padding: 8px 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 14px;
  font-weight: 700;
}

.focus-mode #field {
  opacity: 0.72;
  filter: grayscale(1) contrast(1.35) blur(1px);
}

.focus-mode .visual-card img {
  filter: grayscale(1) contrast(1.25) blur(2px);
}

.focus-mode .copy-panel {
  color: #fff;
}

@media (max-width: 860px) {
  .topbar {
    grid-template-columns: 96px 1fr 76px;
    height: 56px;
    padding: 0 16px;
  }

  .nav {
    display: none;
  }

  .clock {
    justify-self: center;
  }

  .media-stack {
    top: 37%;
    width: min(64vw, 280px);
  }

  .visual-card .caption {
    padding: 18px 16px;
  }

  .visual-card h3 {
    font-size: 30px;
  }

  .visual-card p {
    font-size: 10px;
  }

  .visual-card .line {
    margin-top: 16px;
    font-size: 30px;
  }

  .thumb-rail {
    display: none;
  }

  .copy-panel {
    left: 18px;
    right: 18px;
    top: auto;
    bottom: 86px;
    width: auto;
    padding: 14px 14px 13px;
    background: rgba(18, 18, 18, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(14px);
  }

  .kicker {
    margin-bottom: 10px;
    font-size: 11px;
  }

  .copy-panel h1 {
    margin-bottom: 12px;
    font-size: clamp(28px, 11vw, 46px);
  }

  .copy-scroll {
    max-height: 22vh;
    font-size: 12px;
    line-height: 1.76;
  }

  .mass-title {
    display: none;
  }

  .focus-button {
    right: 18px;
    bottom: 60px;
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}