:root {
  --bg: #0b1220;
  --card: rgba(255, 255, 255, 0.08);
  --card2: rgba(255, 255, 255, 0.06);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.70);
  --muted2: rgba(255, 255, 255, 0.55);
  --border: rgba(255, 255, 255, 0.12);

  --primary: #7c5cff;
  --good: #22c55e;
  --warn: #f59e0b;

  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --radius: 18px;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  position: relative;
}

/* 固定背景层：内容滚动时背景不滚动 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1100px 700px at 15% 20%, rgba(124, 92, 255, 0.28), transparent 55%),
    radial-gradient(900px 650px at 85% 0%, rgba(34, 197, 94, 0.18), transparent 50%),
    radial-gradient(900px 650px at 70% 85%, rgba(245, 158, 11, 0.14), transparent 52%),
    var(--bg);
}

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 18px 22px;
}

.header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

h1 {
  margin: 0;
  font-size: 26px;
  letter-spacing: 0.2px;
}

.sub {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.badge {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  padding: 8px 10px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
  font-size: 12px;
}

.grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 16px;
}

.card {
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--card), var(--card2));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

.card h2 {
  margin: 0 0 14px;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.86);
}

.stage {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 14px;
  align-items: center;
}

.ring {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 10px;
}

.ring svg {
  position: absolute;
  inset: 0;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: rgba(255, 255, 255, 0.10);
  stroke-width: 10;
}

.ring-fg {
  fill: none;
  stroke: var(--primary);
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: 326.7;
  stroke-dashoffset: 326.7;
  filter: drop-shadow(0 10px 24px rgba(124, 92, 255, 0.35));
}

.pulse {
  position: absolute;
  inset: 20px;
  border-radius: 999px;
  background: radial-gradient(circle at 35% 30%, rgba(255, 255, 255, 0.18), rgba(124, 92, 255, 0.15) 55%, rgba(124, 92, 255, 0.08) 90%);
  border: 1px solid rgba(255, 255, 255, 0.10);
  transform: scale(var(--pulse, 1));
  transition: transform 60ms linear;
}

.stage-text {
  display: grid;
  gap: 8px;
}

.phase {
  font-size: 14px;
  color: var(--muted);
}

.count {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.timer {
  font-size: 13px;
  color: var(--muted2);
}

.controls {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.btn {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
  user-select: none;
}

.btn:hover { transform: translateY(-1px); }

.btn:active { transform: translateY(0px); }

.btn.primary {
  border-color: rgba(124, 92, 255, 0.55);
  background: rgba(124, 92, 255, 0.22);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.tips {
  margin-top: 14px;
  border: 1px dashed rgba(255, 255, 255, 0.14);
  padding: 12px 12px;
  border-radius: 14px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.form {
  display: grid;
  gap: 12px;
}

.form.disabled {
  opacity: 0.72;
}

.form.disabled input {
  pointer-events: none;
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
}

input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.22);
  color: var(--text);
  outline: none;
}

input[type="number"]:focus {
  border-color: rgba(124, 92, 255, 0.55);
  box-shadow: 0 0 0 4px rgba(124, 92, 255, 0.12);
}

.toggle {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(0, 0, 0, 0.16);
  font-size: 13px;
  color: var(--muted);
}

.toggle input { transform: scale(1.1); }

.summary {
  margin-top: 2px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(0, 0, 0, 0.16);
  color: rgba(255, 255, 255, 0.78);
  font-size: 13px;
}

.footer {
  margin-top: 14px;
  color: var(--muted2);
  font-size: 12px;
}

@media (max-width: 880px) {
  .grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .pulse { transition: none; }
  .btn { transition: none; }
}