:root {
  --page-bg: #eef2f5;
  --panel: #ffffff;
  --ink: #111827;
  --soft: #64748b;
  --line: #d7dee8;
  --accent: #0f766e;
  --accent-soft: #dff7f2;
  --warn: #b42318;
  --warn-soft: #fff1f0;
  --flip-face: #151923;
  --flip-top: #1f2632;
  --flip-bottom: #0f131b;
  --flip-edge: #090c12;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(255,255,255,.8), rgba(255,255,255,0) 240px),
    var(--page-bg);
  color: var(--ink);
}

.app-shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 72px;
}

.countdown-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 50px rgba(18, 28, 45, .12);
  padding: 24px;
}

.target-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.field span {
  font-size: .78rem;
  font-weight: 700;
  color: var(--soft);
  text-transform: uppercase;
}

.field input {
  width: 100%;
  min-height: 46px;
  border: 1.5px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
  padding: 10px 12px;
}

.field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, .13);
}

.quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: -6px 0 18px;
}

.quick-action-button {
  min-height: 38px;
  border: 1.5px solid var(--accent);
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  font: inherit;
  font-size: .9rem;
  font-weight: 700;
  padding: 8px 13px;
  cursor: pointer;
}

.quick-action-button:hover {
  background: #c9f0e9;
}

.quick-action-button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(15, 118, 110, .18);
}

.status-row {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 24px;
  color: var(--soft);
  font-size: .9rem;
  margin-bottom: 18px;
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px var(--accent-soft);
  flex-shrink: 0;
}

.status-dot.past {
  background: var(--warn);
  box-shadow: 0 0 0 5px var(--warn-soft);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
  perspective: 900px;
}

.time-block {
  min-width: 0;
  display: grid;
  gap: 10px;
  border-radius: 8px;
  text-align: center;
}

.time-value {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 116px;
  border-radius: 8px;
  border: 1px solid var(--flip-edge);
  background:
    linear-gradient(180deg, var(--flip-top) 0 50%, var(--flip-bottom) 50% 100%);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.08),
    inset 0 -1px 0 rgba(255,255,255,.04),
    0 12px 20px rgba(15, 23, 42, .18);
  color: #f8fafc;
  font-size: clamp(2rem, 5vw, 4.1rem);
  line-height: .95;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
  overflow: hidden;
  transform-style: preserve-3d;
}

.time-value::before {
  content: attr(data-prev);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--flip-top);
  border-bottom: 1px solid rgba(0,0,0,.75);
  border-radius: 8px 8px 0 0;
  color: #f8fafc;
  clip-path: inset(0 0 50% 0);
  opacity: 0;
  transform: rotateX(0deg);
  transform-origin: center;
  z-index: 4;
  backface-visibility: hidden;
  pointer-events: none;
}

.time-value::after {
  content: attr(data-current);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--flip-bottom);
  border-top: 1px solid rgba(255,255,255,.08);
  border-radius: 0 0 8px 8px;
  color: #f8fafc;
  clip-path: inset(50% 0 0 0);
  opacity: 0;
  transform: rotateX(88deg);
  transform-origin: center;
  z-index: 5;
  backface-visibility: hidden;
  pointer-events: none;
}

.time-value > span,
.time-value {
  text-shadow: 0 2px 0 rgba(0,0,0,.32);
}

.time-value .value-text {
  position: relative;
  z-index: 1;
}

.time-value .hinge {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: rgba(0,0,0,.78);
  box-shadow: 0 1px 0 rgba(255,255,255,.08);
  z-index: 6;
  pointer-events: none;
}

.time-block.is-flipping .time-value::before {
  opacity: 1;
  animation: flipTop .34s cubic-bezier(.55, .06, .68, .19) forwards;
}

.time-block.is-flipping .time-value::after {
  opacity: 1;
  animation: flipBottom .34s cubic-bezier(.22, .61, .36, 1) .28s forwards;
}

.time-label {
  display: block;
  color: var(--soft);
  font-size: .74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
}

@keyframes flipTop {
  0% {
    transform: rotateX(0deg);
    filter: brightness(1.08);
  }
  100% {
    transform: rotateX(-92deg);
    filter: brightness(.55);
  }
}

@keyframes flipBottom {
  0% {
    transform: rotateX(88deg);
    filter: brightness(.55);
  }
  100% {
    transform: rotateX(0deg);
    filter: brightness(1.08);
  }
}

@media (max-width: 760px) {
  .result-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 520px) {
  .app-shell {
    width: min(100% - 24px, 920px);
    padding-top: 18px;
  }

  .countdown-panel { padding: 16px; }
  .target-form { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .time-value { min-height: 96px; }
}