:root {
  color-scheme: dark;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  --bg: #111314;
  --panel: #f7f3ea;
  --ink: #171a1d;
  --muted: #687076;
  --line: #ded6c8;
  --accent: #176b87;
  --accent-strong: #0f4e63;
  --warn: #b95f1a;
  --danger: #a92828;
  --danger-strong: #7e1d1d;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 16% 18%, rgba(23, 107, 135, 0.28), transparent 28rem),
    linear-gradient(140deg, #101315, #283036 52%, #1d1714);
  color: var(--ink);
}

button,
input {
  font: inherit;
}

.app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px;
}

.timer-panel {
  width: min(980px, 100%);
  min-height: min(720px, calc(100vh - 64px));
  display: flex;
  flex-direction: column;
  gap: 22px;
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: clamp(22px, 4vw, 42px);
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.05;
  letter-spacing: 0;
}

.status {
  min-width: 104px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--accent-strong);
  text-align: center;
  font-weight: 800;
  background: #fffaf1;
}

.settings {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.settings label {
  display: grid;
  grid-template-columns: 1fr 86px auto;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffaf1;
  color: var(--muted);
  font-weight: 700;
}

.settings input {
  width: 100%;
  height: 44px;
  border: 1px solid #c9bfae;
  border-radius: 6px;
  padding: 0 10px;
  background: #ffffff;
  color: var(--ink);
  text-align: center;
  font-size: 20px;
  font-weight: 900;
}

.settings small {
  white-space: nowrap;
}

.time-face {
  flex: 1;
  width: 100%;
  min-height: 280px;
  display: grid;
  place-content: center;
  gap: 18px;
  border: 0;
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.14), transparent),
    #15191c;
  color: #f9f4ea;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.time-face span {
  font-variant-numeric: tabular-nums;
  font-size: clamp(76px, 18vw, 190px);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: 0;
}

.time-face strong {
  color: #d8cbb8;
  font-size: clamp(16px, 2.4vw, 26px);
}

.time-face.warning {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18), transparent),
    #6b3b11;
}

.time-face.finished {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), transparent),
    #5f1616;
}

.controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.test-zone {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.controls button {
  min-height: 58px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #ffffff;
  cursor: pointer;
  font-size: 20px;
  font-weight: 900;
}

.controls button:hover {
  background: var(--accent-strong);
}

.controls .danger,
#testEnd.active {
  background: var(--danger);
}

.controls .danger:hover,
#testEnd.active:hover {
  background: var(--danger-strong);
}

@media (max-width: 760px) {
  .app {
    padding: 14px;
  }

  .timer-panel {
    min-height: calc(100vh - 28px);
    padding: 18px;
  }

  .topbar {
    align-items: stretch;
    flex-direction: column;
    gap: 12px;
  }

  .status {
    width: 100%;
  }

  .settings,
  .controls,
  .test-zone {
    grid-template-columns: 1fr;
  }

  .settings label {
    grid-template-columns: 84px 1fr 64px;
  }

  .time-face {
    min-height: 240px;
  }
}