:root {
  color-scheme: light;
  --background: #f1f4e9;
  --background-gradient: #f8f9f1;
  --text-primary: #20382b;
  --text-secondary: #637463;
  --accent: #42734f;
  --accent-dark: #2c583a;
  --outline: rgba(66, 115, 79, 0.34);
  --rule: rgba(56, 91, 62, 0.25);
  --shadow: rgba(39, 71, 45, 0.13);
  --button-text: #fff;
  --page-rule: rgba(56, 91, 62, 0.25);
  transition: color-scheme 1s ease;
}

:root.is-working {
  color-scheme: dark;
  --background: #261713;
  --background-gradient: #3a211b;
  --text-primary: #f6e5d8;
  --text-secondary: #e0b9a6;
  --accent: #d97b58;
  --accent-dark: #f0a078;
  --outline: rgba(255, 190, 161, 0.72);
  --rule: rgba(243, 190, 164, 0.42);
  --shadow: rgba(8, 3, 2, 0.42);
  --button-text: #261713;
}

:root.is-resting {
  color-scheme: light;
  --background: #dceff7;
  --background-gradient: #f5fbfd;
  --text-primary: #183b4b;
  --text-secondary: #416b7d;
  --accent: #236b86;
  --accent-dark: #164d64;
  --outline: rgba(35, 107, 134, 0.42);
  --rule: rgba(35, 107, 134, 0.28);
  --shadow: rgba(31, 91, 113, 0.16);
  --button-text: #fff;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  background:
    radial-gradient(circle at 15% 8%, rgba(255, 255, 255, 0.78), transparent 28rem),
    linear-gradient(125deg, var(--background) 0%, var(--background-gradient) 100%);
  color: var(--text-primary);
  font-family: "Noto Serif JP", "Noto Serif", "Hiragino Mincho ProN",
    "Yu Mincho", Georgia, serif;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  transition: background 1s ease, color 1s ease;
}

button {
  font: inherit;
}

.audio-warning-dialog {
  width: min(calc(100% - 2rem), 30rem);
  margin: auto;
  padding: 0;
  border: 1px solid var(--accent);
  background: var(--background);
  box-shadow: 0 1.5rem 4rem var(--shadow);
  color: var(--text-primary);
}

.audio-warning-dialog::backdrop {
  background: rgba(20, 31, 23, 0.62);
}

.audio-warning-content {
  padding: clamp(2rem, 7vw, 3.5rem) clamp(1.5rem, 7vw, 3.5rem)
    clamp(1.75rem, 6vw, 3rem);
  text-align: center;
}

.audio-warning-icon {
  margin: 0 0 1.5rem;
  font-size: clamp(3.5rem, 14vw, 5.5rem);
  line-height: 1;
}

.audio-warning-dialog h2 {
  margin: 0;
  color: var(--accent);
  font-size: clamp(1rem, 3vw, 1.3rem);
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.7;
}

.audio-warning-dialog h2 + p {
  margin: 1.25rem 0 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  line-height: 1.9;
}

.audio-warning-close {
  margin-top: 2rem;
  min-width: 8rem;
  padding: 0.7rem 1.5rem;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--button-text);
  cursor: pointer;
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  transition: background-color 160ms ease, color 160ms ease,
    transform 160ms ease;
}

.audio-warning-close:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
}

.audio-warning-close:focus-visible {
  outline: 3px solid var(--outline);
  outline-offset: 4px;
}

.audio-warning-close:active {
  transform: translateY(0);
}

.timer-page {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  position: relative;
  padding: clamp(1.75rem, 5vw, 4.5rem) clamp(1.5rem, 7vw, 8rem)
    clamp(1.5rem, 4vw, 3.5rem);
  isolation: isolate;
}

.timer-page::before,
.timer-page::after {
  position: absolute;
  z-index: -1;
  content: "";
  pointer-events: none;
  transition: background-color 1s ease;
}

.timer-page::before {
  top: 0;
  right: clamp(1.25rem, 4vw, 4rem);
  bottom: 0;
  width: 1px;
  background: var(--rule);
}

.timer-page::after {
  top: clamp(1.25rem, 4vw, 3.5rem);
  right: 0;
  left: 0;
  height: 1px;
  background: var(--rule);
}

.page-header {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  max-width: 37rem;
}

.brand-mark {
  display: grid;
  flex: 0 0 auto;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--accent);
  border-radius: 50%;
  color: var(--accent);
  font-family: "Noto Serif", "Hiragino Mincho ProN", "Yu Mincho", Georgia, serif;
  font-size: 1.2rem;
  place-items: center;
}

.header-copy {
  padding-top: 0.15rem;
}

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--accent);
  font-family: "Noto Serif", "Hiragino Mincho ProN", "Yu Mincho", Georgia, serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

h1 {
  margin: 0;
  font-size: clamp(1.2rem, 2.4vw, 2rem);
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1.75;
}

.timer-panel {
  align-self: center;
  justify-self: center;
  width: min(100%, 68rem);
  padding: clamp(2.5rem, 7vh, 5rem) clamp(0.5rem, 3vw, 2.5rem);
  text-align: center;
}

.section-label {
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: center;
  margin-bottom: clamp(1.75rem, 4vh, 3rem);
}

.section-label-line {
  width: clamp(2rem, 7vw, 5rem);
  height: 1px;
  background: var(--rule);
}

.timer-status {
  margin: 0;
  color: var(--text-secondary);
  font-size: clamp(0.85rem, 1.4vw, 1rem);
  font-weight: 500;
  letter-spacing: 0.12em;
  transition: color 1s ease;
}

.timer-message {
  margin: -1.5rem 0 clamp(1.75rem, 4vh, 3rem);
  color: var(--text-secondary);
  font-size: clamp(0.78rem, 1.2vw, 0.9rem);
  letter-spacing: 0.08em;
  line-height: 1.8;
  transition: color 1s ease;
}

.timer-display {
  margin: 0;
  color: var(--accent-dark);
  font-family: "Noto Serif", "Noto Serif JP", "Hiragino Mincho ProN",
    "Yu Mincho", Georgia, serif;
  font-size: clamp(4rem, 16vw, 13.5rem);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  letter-spacing: -0.07em;
  line-height: 0.95;
  white-space: nowrap;
  transition: color 1s ease;
}

@keyframes timer-final-minute-blink {
  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.7;
  }
}

.timer-display.is-final-minute {
  animation: timer-final-minute-blink 2s ease-in-out infinite;
}

.timer-caption {
  margin: clamp(1.5rem, 3vh, 2.25rem) 0 0;
  color: var(--text-secondary);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

.timer-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin-top: clamp(2.25rem, 6vh, 4rem);
  min-width: min(100%, 18rem);
  padding: 0.95rem 1.35rem 0.95rem 1.75rem;
  border: 1px solid var(--accent);
  border-radius: 0;
  background: var(--accent);
  box-shadow: 0 0.8rem 1.5rem var(--shadow);
  color: var(--button-text);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  transition: background-color 1s ease, box-shadow 160ms ease, color 1s ease,
    transform 160ms ease;
}

.button-arrow {
  font-family: Georgia, serif;
  font-size: 1.25rem;
  line-height: 1;
  transition: transform 160ms ease;
}

.timer-button:hover {
  background: var(--accent-dark);
  box-shadow: 0 1rem 2rem var(--shadow);
  transform: translateY(-2px);
}

.timer-button:hover .button-arrow {
  transform: translateX(0.25rem);
}

.timer-button:focus-visible {
  outline: 3px solid var(--outline);
  outline-offset: 4px;
}

.timer-button:active {
  box-shadow: 0 0.5rem 1rem var(--shadow);
  transform: translateY(0);
}

.worldview {
  position: relative;
  width: min(100%, 48rem);
  margin: clamp(4rem, 10vh, 7rem) auto 0;
  padding-top: clamp(1.75rem, 4vh, 2.75rem);
  border-top: 1px solid var(--rule);
  text-align: left;
}

.worldview::before {
  position: absolute;
  top: -0.15em;
  left: 0;
  color: var(--accent);
  content: "“";
  font-family: Georgia, serif;
  font-size: 3rem;
  line-height: 1;
  transition: color 1s ease;
}

.worldview h2 {
  margin: 0 0 1.25rem;
  padding-left: 2.25rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  line-height: 1.5;
  transition: color 1s ease;
}

.worldview-copy {
  color: var(--text-secondary);
  font-size: clamp(0.82rem, 1.25vw, 0.92rem);
  letter-spacing: 0.04em;
  line-height: 2.15;
  transition: color 1s ease;
}

.worldview-copy p {
  margin: 0;
}

.worldview-copy p + p {
  margin-top: 1.25rem;
}

.product-summary {
  margin-top: clamp(2rem, 5vh, 3.5rem);
  border-top: 1px solid var(--rule);
  color: var(--text-secondary);
  font-size: clamp(0.82rem, 1.25vw, 0.92rem);
  letter-spacing: 0.04em;
  line-height: 2.15;
}

.product-summary summary {
  padding: 1rem 0;
  color: var(--accent);
  cursor: pointer;
  font-weight: 600;
  transition: color 1s ease;
}

.product-summary summary:focus-visible {
  outline: 3px solid var(--outline);
  outline-offset: 4px;
}

.product-summary-copy {
  padding: 0 0 1rem;
}

.product-summary-copy p {
  margin: 0;
}

.smartphone-warning {
  margin-top: clamp(2rem, 5vh, 3.5rem);
  color: var(--text-secondary);
  font-size: clamp(0.82rem, 1.25vw, 0.92rem);
  letter-spacing: 0.04em;
  line-height: 2.15;
}

.smartphone-warning h2 {
  margin: 0 0 0.5rem;
  color: var(--accent);
  font-size: 1em;
  font-weight: 600;
  line-height: 1.5;
}

.smartphone-warning p {
  margin: 0;
}

.product-summary-copy p + p {
  margin-top: 1.25rem;
}

.page-footer {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  justify-content: space-between;
  color: var(--text-secondary);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  transition: color 1s ease;
}

:root,
body,
.timer-page::before,
.timer-page::after,
.brand-mark,
.eyebrow,
.timer-status,
.timer-message,
.timer-display,
.timer-caption,
.timer-button,
.worldview,
.page-footer,
.page-footer span {
  transition-property: background-color, background, border-color, color, box-shadow;
  transition-duration: 1s;
  transition-timing-function: ease;
}

.page-footer p {
  margin: 0;
}

.page-footer span {
  color: var(--accent);
  font-family: "Noto Serif", "Hiragino Mincho ProN", "Yu Mincho", Georgia, serif;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.page-footer i {
  padding: 0 0.6rem;
  color: var(--rule);
  font-style: normal;
}

.footer-note {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

.copyright {
  flex-basis: 100%;
  margin-top: 0.55rem !important;
  text-align: right;
}

@media (max-width: 38rem) {
  .timer-page {
    padding: 1.75rem 1.25rem 1.5rem;
  }

  .timer-page::before {
    right: 1.25rem;
  }

  .timer-page::after {
    top: 1.25rem;
  }

  .page-header {
    gap: 0.85rem;
  }

  .brand-mark {
    width: 2.15rem;
    height: 2.15rem;
    font-size: 1rem;
  }

  h1 {
    letter-spacing: 0.06em;
  }

  .timer-panel {
    padding-right: 0;
    padding-left: 0;
  }

  .timer-display {
    font-size: clamp(3.45rem, 15.5vw, 7rem);
    letter-spacing: -0.08em;
  }

  .timer-status {
    letter-spacing: 0.06em;
  }

  .timer-caption {
    letter-spacing: 0.06em;
  }

  .timer-message {
    margin-top: -1rem;
    letter-spacing: 0.04em;
  }

  .worldview {
    margin-top: 3.5rem;
    padding-top: 1.5rem;
  }

  .worldview-copy {
    font-size: 0.82rem;
    letter-spacing: 0.02em;
    line-height: 2;
  }

  .worldview-copy p + p {
    margin-top: 1rem;
  }

  .product-summary {
    font-size: 0.82rem;
    letter-spacing: 0.02em;
    line-height: 2;
  }

  .product-summary-copy p + p {
    margin-top: 1rem;
  }

  .page-footer {
    display: block;
    line-height: 2;
  }

  .audio-warning-content {
    padding-right: 1.25rem;
    padding-left: 1.25rem;
  }

  .footer-note {
    margin-top: 0.35rem !important;
  }

  .copyright {
    margin-top: 0.35rem !important;
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  .timer-button,
  .button-arrow,
  body,
  .timer-page::before,
  .timer-page::after,
  .audio-warning-close,
  .timer-status,
  .timer-message,
  .timer-display,
  .page-footer {
    transition: none;
  }

  .timer-display.is-final-minute {
    animation: none;
  }
}