:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --accent: #10b981;
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

header.site {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
}
header.site h1 { font-size: 26px; font-weight: 700; }
header.site p { margin-top: 6px; font-size: 14px; opacity: 0.92; }

main {
  max-width: 960px;
  margin: 28px auto;
  padding: 0 16px;
}

section.block {
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 22px 22px 26px;
  margin-bottom: 24px;
}
section.block h2 {
  font-size: 19px;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}
section.block h2 .tag {
  font-size: 12px;
  font-weight: 600;
  background: #dbeafe;
  color: var(--primary-dark);
  padding: 2px 10px;
  border-radius: 999px;
}
section.block .hint { color: var(--muted); font-size: 13px; margin-bottom: 16px; }

.unit {
  border-top: 1px solid var(--border);
  padding: 14px 0;
}
.unit:first-of-type { border-top: none; }
.unit-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 16px;
}
.unit-head .count { color: var(--muted); font-size: 13px; font-weight: 500; }

/* words grid */
.words-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 14px;
}

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}
.btn:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); color: #fff; }
.btn .icon { font-size: 16px; }

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.chip {
  background: #f8fafc;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  transition: all 0.15s ease;
}
.chip:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

/* player */
.player-wrap {
  background: var(--card);
  border-radius: 16px;
  box-shadow: var(--shadow);
  max-width: 640px;
  margin: 30px auto;
  padding: 26px 24px 30px;
}
.back-link { font-size: 14px; color: var(--muted); text-decoration: none; }
.back-link:hover { color: var(--primary); }
.now-title { font-size: 20px; font-weight: 700; margin: 12px 0 4px; }
.now-sub { color: var(--muted); font-size: 14px; margin-bottom: 18px; }

.progress-row { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.time { font-size: 12px; color: var(--muted); min-width: 42px; font-variant-numeric: tabular-nums; }
.time.right { text-align: right; }
progress.bar {
  flex: 1;
  height: 8px;
  border: none;
  border-radius: 999px;
  overflow: hidden;
  background: #e2e8f0;
  cursor: pointer;
  appearance: none;
}
progress.bar::-webkit-progress-bar { background: #e2e8f0; }
progress.bar::-webkit-progress-value { background: var(--primary); transition: width 0.1s linear; }
progress.bar::-moz-progress-bar { background: var(--primary); }

.controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}
.ctrl {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-size: 18px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}
.ctrl:hover { border-color: var(--primary); color: var(--primary); }
.ctrl.play {
  width: 60px; height: 60px;
  background: var(--primary); color: #fff; border-color: var(--primary);
  font-size: 22px;
}
.ctrl.play:hover { background: var(--primary-dark); color: #fff; }

.speed-row {
  display: flex; align-items: center; justify-content: center;
  gap: 6px; margin-top: 18px; flex-wrap: wrap;
}
.speed-row .label { font-size: 13px; color: var(--muted); margin-right: 4px; }
.speed {
  border: 1px solid var(--border);
  background: #fff; color: var(--text);
  padding: 5px 10px; border-radius: 8px;
  font-size: 13px; cursor: pointer; transition: all 0.15s ease;
}
.speed:hover { border-color: var(--primary); color: var(--primary); }
.speed.active { background: var(--primary); border-color: var(--primary); color: #fff; }

footer.site { text-align: center; color: var(--muted); font-size: 12px; padding: 24px 16px 32px; }

/* 底部访问统计栏 */
.stats-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  max-width: 680px;
  margin: 0 auto 14px;
  box-shadow: var(--shadow);
}
.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 70px;
}
.stat-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.stat-label {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}
.stat-divider {
  width: 1px;
  height: 34px;
  background: var(--border);
}
.ip-scroll {
  flex: 1;
  min-width: 0;
  min-height: 48px;
  overflow: hidden;
  position: relative;
}
.ip-scroll .stat-label {
  margin-bottom: 4px;
}
.ip-track {
  display: flex;
  flex-wrap: nowrap;
  gap: 10px;
  white-space: nowrap;
  animation: ipscroll 40s linear infinite;
}
.ip-track:hover { animation-play-state: paused; }
.ip-chip {
  display: inline-block;
  background: #f1f5f9;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  flex: 0 0 auto;
}
.ip-chip em {
  font-style: normal;
  color: var(--muted);
  margin-left: 4px;
}
.copy { margin-top: 6px; }

@keyframes ipscroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

@media (max-width: 520px) {
  .stats-bar { gap: 12px; padding: 12px; }
  .stat-divider { display: none; }
  .stat-item { min-width: 56px; }
  .stat-num { font-size: 18px; }
  .ip-scroll { min-width: 100%; order: 3; }
  .ip-track { animation-duration: 28s; }
}

@media (max-width: 520px) {
  header.site h1 { font-size: 22px; }
  .ctrl { width: 42px; height: 42px; font-size: 16px; }
  .ctrl.play { width: 54px; height: 54px; font-size: 20px; }
}