/* 主题变量：背景三色 + 强调双色（影响进度条&环形） */
:root {
  --dur-bg: 700ms;
  --dur-accent: 420ms;
  --dur-text: 240ms;
  --c1: #e6eef5;
  --c2: #c9d6e3;
  --c3: #aeb9c6;
  --acc1: #90a4ae;
  --acc2: #607d8b;
  --accent: #5a6b7a;
  --text: #1b1f23;
  --muted: #5b6570;
  --card-bg: rgba(255, 255, 255, 0.55);
  --card-stroke: rgba(0, 0, 0, 0.06);
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.1);
  --ring-track: color-mix(in srgb, var(--accent) 18%, rgba(255, 255, 255, 0.65));
  --ring-tick: color-mix(in srgb, var(--accent) 35%, rgba(255, 255, 255, 0.85));
  --ring-core: rgba(255, 255, 255, 0.88);
  --dur: 0.45s;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --dur: 0s;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Noto Sans CJK SC", "Microsoft Yahei", Helvetica, Arial;
  color: var(--text);
  position: relative;
  z-index: 0;
  background: linear-gradient(160deg, var(--c1), var(--c2), var(--c3));
  background-size: 200% 200%;
  animation: bg 18s ease-in-out infinite;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(160deg, var(--c1_next, var(--c1)), var(--c2_next, var(--c2)), var(--c3_next, var(--c3)));
  background-size: 200% 200%;
  animation: bg 18s ease-in-out infinite;
  opacity: 0;
  transition: opacity var(--dur-bg) ease;
  will-change: opacity;
}

body.bg-fading::before {
  opacity: 1;
}

@keyframes bg {
  0% {
    background-position: 0 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0 50%;
  }
}

@media (prefers-reduced-motion: reduce) {
  body {
    animation: none;
  }
}

.wrap {
  min-height: 100%;
  display: grid;
  grid-template-rows: auto 1fr;
}

header {
  position: relative;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

header h1 {
  margin: 0;
  font-size: clamp(18px, 2.6vw, 28px);
  font-weight: 800;
  letter-spacing: 0.4px;
}

#btn-theme,
#btn-drawer {
  position: absolute;
  top: 12px;
  appearance: none;
  border: 1px solid var(--card-stroke);
  background: rgba(255, 255, 255, 0.7);
  border-radius: 12px;
  padding: 8px 10px;
  cursor: pointer;
  box-shadow: var(--shadow);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  outline: none;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

#btn-theme {
  right: 20px;
}

#btn-drawer {
  left: 20px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1;
  justify-content: center;
  min-width: 42px;
}

#btn-theme:hover,
#btn-drawer:hover {
  filter: brightness(0.98);
}

#btn-theme:focus,
#btn-drawer:focus {
  outline: none;
}

#btn-theme:focus-visible,
#btn-drawer:focus-visible {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--acc2) 40%, transparent), var(--shadow);
}

.icon {
  width: 18px;
  height: 18px;
}

.theme-label {
  font-size: 13px;
}

.card {
  width: min(1100px, 90vw);
  margin: 24px auto;
  background: var(--card-bg);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--card-stroke);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: clamp(18px, 2.6vw, 32px);
}

.topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
  flex-wrap: nowrap;
  overflow: hidden;
}

.range {
  color: var(--muted);
  font-size: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  flex: 1 1 auto;
  min-width: 0;
}

.badge {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.06);
  color: var(--accent);
  border: 1px solid var(--card-stroke);
}

.countdown {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 20px);
  align-items: stretch;
  margin: 12px 0 22px;
}

.unit {
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--card-stroke);
  border-radius: 18px;
  padding: clamp(14px, 2.2vw, 22px);
  display: grid;
  grid-template-rows: 1fr auto;
  place-items: center;
  min-height: 120px;
  box-shadow: 0 12px 22px rgba(15, 23, 42, 0.06);
}

.num {
  display: flex;
  gap: 0.06em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" on;
  font-weight: 800;
  font-size: clamp(32px, 6.4vw, 68px);
}

.digit {
  display: inline-block;
  min-width: 0.66em;
  text-align: center;
  will-change: transform, opacity;
  text-shadow: 0 6px 12px rgba(15, 23, 42, 0.08);
}

.label {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.26px;
  text-transform: uppercase;
}

.progress {
  margin: 10px 0 4px;
}

.bar {
  position: relative;
  height: 16px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--card-stroke);
  border-radius: 999px;
  overflow: hidden;
}

.fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--acc1), var(--acc2));
  transform-origin: left center;
  transform: scaleX(0);
  will-change: transform;
  transition: transform 0.6s ease;
  position: relative;
}

.fill::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--acc1_next, var(--acc1)), var(--acc2_next, var(--acc2)));
  opacity: 0;
  transition: opacity var(--dur-accent) ease-in-out;
}

body.bg-fading .fill::before {
  opacity: 1;
}

/* During background crossfade, freeze heavy layers until the new theme is committed */
body.bg-fading,
body.bg-fading .card,
body.bg-fading .unit,
body.bg-fading .panel,
body.bg-fading .badge,
body.bg-fading .preview,
body.bg-fading .bar,
body.bg-fading .fill {
  transition: none !important;
}

/* 只在 cross-fade 期间禁用地面柔光，别碰圆环本体 */
/* 如果你手机上依旧稳定，不禁用也行 */
/* （本包已去掉这段，避免误杀阴影） */

.meta {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  font-size: 13px;
  color: var(--muted);
  transition: color var(--dur-text) ease-in-out;
}

.meta strong {
  color: inherit;
}

.grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.6vw, 26px);
}

.panel {
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--card-stroke);
  border-radius: 18px;
  padding: clamp(16px, 2.4vw, 24px);
}

.backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.28);
  backdrop-filter: blur(2px);
  z-index: 30;
  display: none;
}

.backdrop.open {
  display: block;
}

.drawer {
  position: fixed;
  inset: 0 auto 0 0;
  width: min(320px, 90vw);
  background: var(--card-bg);
  border-right: 1px solid var(--card-stroke);
  box-shadow: var(--shadow);
  transform: translateX(-100%);
  transition: transform 0.25s ease;
  z-index: 40;
  padding: 20px 20px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow: hidden;
  color: var(--text);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.drawer.open {
  transform: translateX(0);
}

.drawer-header h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  color: var(--accent);
}

.drawer-body {
  overflow-y: auto;
  padding-right: 6px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.drawer-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.drawer-group {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.4px;
  color: var(--muted);
  text-transform: uppercase;
}

.panel-card {
  background: var(--card-bg);
  border: 1px solid var(--card-stroke);
  border-radius: 18px;
  padding: 16px 18px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.panel-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
}

.panel-card-value {
  font-size: 18px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum' on;
}

.panel-card-desc {
  font-size: 13px;
  color: var(--muted);
}

.panel h3 {
  margin: 0;
  font-size: 15px;
  letter-spacing: 0.2px;
  font-weight: 700;
  color: var(--accent);
}

.wheel-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 2.6vw, 30px);
  border-radius: 24px;
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.72));
  box-shadow: 0 26px 46px rgba(15, 23, 42, 0.14);
  border: 1px solid color-mix(in srgb, var(--accent) 12%, rgba(255, 255, 255, 0.6));
  grid-column: 1 / -1;
  isolation: isolate;
  contain: paint;
  transform: translateZ(0);
}

.wheel-panel::before {
  content: "";
  position: absolute;
  inset: -30% 30% auto -30%;
  height: 220%;
  background: radial-gradient(circle at 20% 20%, color-mix(in srgb, var(--accent) 18%, rgba(255, 255, 255, 0.9)) 0%, rgba(255, 255, 255, 0) 62%);
  opacity: 0.55;
  pointer-events: none;
  filter: blur(0.4px);
}

.wheel-panel::after {
  content: "";
  position: absolute;
  inset: auto -20% -45% 40%;
  height: 220%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 12%, rgba(255, 255, 255, 0.92)) 0%, rgba(255, 255, 255, 0) 70%);
  opacity: 0.6;
  pointer-events: none;
}

.wheel-head {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: clamp(16px, 1.8vw, 22px);
}

.wheel-grid {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ring-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  box-shadow: none;
}

.ring-wrap::before {
  content: "";
  position: absolute;
  inset: auto 14% -4% 14%;
  height: 60px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(15, 23, 42, 0.22), rgba(15, 23, 42, 0));
  opacity: 0.55;
  filter: blur(8px);
  z-index: 0;
}

.ring {
  position: relative;
  z-index: 1;
  width: clamp(180px, 28vw, 280px);
  height: auto;
  display: block;
  overflow: visible;
  filter: drop-shadow(0 16px 28px rgba(15, 23, 42, 0.18));
  will-change: filter;
  transform: translateZ(0);
}

.ring text {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  fill: var(--accent);
  filter: drop-shadow(0 2px 6px rgba(15, 23, 42, 0.18));
  transition: fill var(--dur-text) ease-in-out;
}

.ring tspan.ring-percent {
  font-size: clamp(24px, 5vw, 32px);
  font-weight: 800;
}

.ring tspan.ring-state {
  font-size: 12px;
  letter-spacing: 0.3em;
  fill: color-mix(in srgb, var(--accent) 65%, rgba(20, 26, 31, 0.36));
}

.ring .ring-ambient {
  opacity: 0.9;
  transition: opacity var(--dur-accent) ease-in-out;
}

.ring .ring-track {
  stroke: var(--ring-track);
  stroke-width: 12;
  fill: none;
  stroke-linecap: round;
}

.ring .ring-ticks {
  stroke: var(--ring-tick);
  stroke-width: 2;
  fill: none;
  stroke-dasharray: 2 9;
  stroke-linecap: round;
  opacity: 0.6;
}

.ring .ring-inner {
  fill: var(--ring-core);
  stroke: rgba(255, 255, 255, 0.9);
  stroke-width: 0.8;
}

/* 让渐变 stop 的颜色也做同样的过渡 */
#g1s1, #g1s2 {
  transition: stop-color var(--dur-accent) ease;
}

/* 用和小圆相同的“next”变量——同一时刻起跑 */
#g1s1 { stop-color: var(--acc1_next, var(--acc1)); }
#g1s2 { stop-color: var(--acc2_next, var(--acc2)); }

/* 小圆维持补间，和上面时长一致 */
.ring .ring-head {
  /* 读取 next 变量 → 立即触发可插值颜色变化 */
  fill: var(--acc2_next, var(--acc2));
  stroke: rgba(255, 255, 255, 0.85);
  stroke-width: 0.8;
  transition: fill var(--dur-accent) ease,
              stroke var(--dur-accent) ease,
              opacity var(--dur-accent) ease,
              transform var(--dur-accent) ease;
}

.popover {
  position: fixed;
  z-index: 20;
  min-width: 240px;
  max-width: 92vw;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--card-stroke);
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.18);
  padding: 10px;
  opacity: 0;
  transform: scale(0.96) translateY(-6px);
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.25s ease, transform 0.25s ease;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.popover.open {
  opacity: 1;
  transform: scale(1) translateY(0);
  pointer-events: auto;
  visibility: visible;
}

.theme-list {
  display: grid;
  gap: 10px;
}

.item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px;
  border-radius: 12px;
  border: 1px solid var(--card-stroke);
  background: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  transition: background-color 0.25s ease, border-color 0.25s ease;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.item:hover {
  filter: brightness(0.98);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--card-stroke);
  background: transparent;
  margin-left: 4px;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.item.selected .dot {
  background: var(--dot);
  border-color: var(--dot);
}

.preview {
  flex: 1;
  height: 40px;
  border-radius: 999px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  background: var(--sw, linear-gradient(90deg, #e6eef5, #c9d6e3, #aeb9c6));
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview .name {
  font-size: 12px;
  color: #2b3640;
}

body,
.card,
.unit,
.panel,
.badge,
.preview,
.bar,
.fill {
  transition: background 0.8s ease, background-color 0.6s ease, color 0.4s ease, border-color 0.5s ease;
}

@keyframes tick {
  0% {
    transform: translateY(20%);
    opacity: 0;
  }

  40% {
    transform: translateY(-6%);
  }

  100% {
    transform: translateY(0);
    opacity: 1;
  }
}

.digit.is-ticking {
  animation: tick var(--dur) ease;
}

@media (max-width: 720px) {
  .countdown {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  body {
    font-size: 16px;
  }

  header {
    padding: 28px 40px;
  }

  header h1 {
    font-size: 32px;
    letter-spacing: 0.6px;
  }

  #btn-theme,
  #btn-drawer {
    top: 18px;
    padding: 10px 14px;
    font-size: 14px;
    border-radius: 14px;
  }

  #btn-theme {
    right: 36px;
  }

  #btn-drawer {
    left: 36px;
    min-width: 48px;
  }

  .card {
    width: min(1180px, 84vw);
    padding: 40px 48px;
    border-radius: 26px;
    gap: 24px;
  }

  .topline {
    gap: 28px;
    margin-bottom: 18px;
  }

  .range {
    font-size: 15px;
    gap: 12px 22px;
  }

  .badge {
    font-size: 15px;
    padding: 8px 18px;
  }

  .countdown {
    gap: 24px;
    margin: 20px 0 28px;
  }

  .unit {
    padding: 28px 24px;
    border-radius: 22px;
    min-height: 168px;
  }

  .num {
    font-size: clamp(40px, 3vw, 80px);
  }

  .label {
    font-size: 15px;
    letter-spacing: 0.36px;
  }

  .bar {
    height: 20px;
  }

  .meta {
    font-size: 14px;
    gap: 14px 28px;
  }

  .grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: stretch;
  }

  .panel {
    padding: 30px;
    border-radius: 22px;
  }

  .wheel-panel {
    padding: 36px;
    border-radius: 26px;
  }

  .wheel-grid {
    justify-content: center;
  }

  .ring {
    width: clamp(240px, 22vw, 340px);
  }
}

@media (min-width: 1360px) {
  body {
    font-size: 17px;
  }

  header h1 {
    font-size: 36px;
  }

  .card {
    width: min(1280px, 78vw);
    padding: 48px 64px;
  }

  .topline {
    margin-bottom: 24px;
  }

  .countdown {
    gap: 28px;
  }

  .unit {
    padding: 32px 28px;
    min-height: 188px;
  }

  .meta {
    font-size: 15px;
  }

  .grid {
    gap: 32px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .wheel-panel {
    padding: 42px;
    border-radius: 28px;
  }
}