:root {
  color-scheme: dark;
  --paper: #0f0d0a;
  --paper-soft: #17130f;
  --ink: #f5efe3;
  --muted: #8e8575;
  --dim: rgba(245, 239, 227, 0.13);
  --line: rgba(245, 239, 227, 0.16);
  --accent: #d85a39;
  --accent-2: #75c2a3;
  --wood: #65b86d;
  --fire: #e85a4a;
  --earth: #d4a34d;
  --metal: #d8d2bd;
  --water: #62a7d8;
  --shadow: rgba(0, 0, 0, 0.35);
  font-family:
    ui-serif, "Songti SC", "Noto Serif CJK SC", "STSong", serif;
}

:root[data-theme="light"] {
  color-scheme: light;
  --paper: #ffffff;
  --paper-soft: #f5f5f5;
  --ink: #17130f;
  --muted: #716757;
  --dim: rgba(23, 19, 15, 0.13);
  --line: rgba(23, 19, 15, 0.16);
  --accent: #b7412e;
  --accent-2: #2d806c;
  --wood: #2f7d42;
  --fire: #c34132;
  --earth: #9a6a21;
  --metal: #746f63;
  --water: #2d6f9f;
  --shadow: rgba(88, 67, 40, 0.12);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--paper-soft) 42%, transparent), transparent 18rem),
    linear-gradient(90deg, rgba(216, 90, 57, 0.07), transparent 25%),
    var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

:root[data-theme="light"] body {
  background: #ffffff;
}

button,
time {
  font: inherit;
}

.clock-shell {
  display: grid;
  min-height: 100svh;
  grid-template-rows: auto 1fr auto;
  width: min(100%, 86rem);
  margin-inline: auto;
  padding: clamp(1rem, 2.3vw, 2rem) clamp(1rem, 3.8vw, 3.75rem);
}

.topbar,
.bottombar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: clamp(0.78rem, 1.6vw, 0.95rem);
  letter-spacing: 0;
}

.topbar {
  border-bottom: 1px solid var(--line);
  padding-bottom: clamp(0.85rem, 1.6vw, 1.1rem);
}

.brand {
  color: var(--ink);
  font-weight: 700;
}

.word-stage {
  position: relative;
  display: grid;
  min-height: clamp(31rem, 72svh, 47rem);
  place-items: center;
  isolation: isolate;
}

.readout {
  width: min(66rem, 100%);
  padding-block: clamp(3.4rem, 8vw, 6.8rem);
  text-align: center;
}

.solar-term {
  min-height: 1.6rem;
  margin: 0 0 1.2rem;
  color: var(--accent-2);
  font-family:
    ui-sans-serif, "PingFang SC", "Noto Sans CJK SC", sans-serif;
  font-size: clamp(0.86rem, 1.8vw, 1.05rem);
  font-weight: 650;
}

h1 {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: baseline;
  gap: 0 0.2em;
  width: 100%;
  margin: 0 auto;
  font-size: var(--sentence-size, 4rem);
  font-weight: 700;
  line-height: 1.03;
  letter-spacing: 0;
  white-space: nowrap;
  text-shadow: 0 1rem 3rem var(--shadow);
}

.date-controls {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin-top: clamp(1.35rem, 3vw, 2rem);
  max-width: 100%;
}

.gregorian-picker,
.now-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--paper-soft) 78%, transparent);
  color: var(--ink);
  font-family:
    ui-sans-serif, "PingFang SC", "Noto Sans CJK SC", sans-serif;
  font-size: clamp(0.88rem, 1.6vw, 1rem);
  line-height: 1;
}

.gregorian-picker {
  min-width: 14.6rem;
  max-width: 100%;
  padding: 0.72rem 0.8rem;
  color-scheme: inherit;
}

.now-button {
  padding: 0.74rem 0.86rem;
  cursor: pointer;
}

.gregorian-picker:hover,
.now-button:hover {
  border-color: color-mix(in srgb, var(--accent) 52%, var(--line));
}

.gregorian-picker:focus-visible,
.now-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.sentence-unit {
  display: inline-flex;
  align-items: baseline;
  flex: 0 0 auto;
  white-space: nowrap;
}

.sentence-suffix {
  margin-left: 0.04em;
  color: var(--muted);
  font-family:
    ui-sans-serif, "PingFang SC", "Noto Sans CJK SC", sans-serif;
  font-size: 0.34em;
  font-weight: 600;
}

.ganzhi-char {
  color: var(--ink);
}

.element-wood {
  color: var(--wood);
}

.element-fire {
  color: var(--fire);
}

.element-earth {
  color: var(--earth);
}

.element-metal {
  color: var(--metal);
}

.element-water {
  color: var(--water);
}

.bottombar {
  align-items: flex-end;
  border-top: 1px solid var(--line);
  padding-top: clamp(0.85rem, 1.6vw, 1.1rem);
}

.bottombar span:last-child {
  text-align: right;
}

.theme-zone {
  position: fixed;
  right: clamp(0.65rem, 2vw, 1.25rem);
  bottom: clamp(0.65rem, 2vw, 1.25rem);
  display: grid;
  width: 3rem;
  height: 3rem;
  place-items: center;
  z-index: 10;
}

.theme-toggle {
  display: grid;
  width: 1.6rem;
  height: 1.6rem;
  place-items: center;
  border: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font-family:
    ui-sans-serif, "PingFang SC", "Noto Sans CJK SC", sans-serif;
  font-size: 1.12rem;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
  padding: 0;
  transition:
    color 180ms ease,
    opacity 180ms ease;
}

.theme-zone:hover .theme-toggle,
.theme-zone:focus-within .theme-toggle {
  opacity: 0.72;
  pointer-events: auto;
}

.theme-toggle:hover {
  color: var(--accent);
  opacity: 1;
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

@media (max-width: 680px), (max-height: 560px) {
  .clock-shell {
    grid-template-rows: 1fr;
    place-items: center;
    min-height: 100svh;
    padding: 1rem 1.15rem;
  }

  .topbar,
  .bottombar {
    display: none;
  }

  .word-stage {
    min-height: auto;
    width: 100%;
  }

  .readout {
    padding-block: 0;
  }

  h1 {
    gap: 0 0.16em;
  }

  .date-controls {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
  }

  .gregorian-picker {
    min-width: 0;
    width: min(100%, 14.8rem);
  }

}