:root {
  --blue: #2196f3;
  --green: #4caf50;
  --red: #f44336;
  --purple: #9c27b0;
  --slate: #607d8b;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #f7f9fc;
  --card: #ffffff;
  --shadow: 0 10px 30px rgba(31, 41, 55, 0.08);
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
}
button { font: inherit; }

.app-shell {
  width: min(100%, 540px);
  min-height: 100vh;
  margin: 0 auto;
  background: linear-gradient(180deg, #eaf5ff 0, #f7f9fc 180px);
  padding: max(14px, env(safe-area-inset-top)) 14px calc(82px + env(safe-area-inset-bottom));
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin: 6px 2px 16px;
}
.topbar h1 { margin: 0; font-size: 28px; line-height: 1.15; }
.topbar p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
.badge {
  flex: 0 0 auto;
  padding: 8px 12px;
  border-radius: 999px;
  background: #fff;
  box-shadow: var(--shadow);
  color: var(--blue);
  font-weight: 800;
}

.screen { display: none; }
.screen.active { display: block; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

.card, .list-card {
  background: var(--card);
  border: 1px solid rgba(229, 231, 235, 0.9);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.selected-card { padding: 14px; margin-bottom: 12px; }
.selected-header { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 14px; }
.selected-header strong { color: var(--blue); }
.selected-numbers {
  min-height: 48px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 12px;
}
.selected-numbers.empty { color: #9ca3af; }
.ball {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: var(--blue);
  font-weight: 800;
  box-shadow: 0 5px 14px rgba(33,150,243,0.25);
}

.numbers-card { padding: 12px; margin-bottom: 12px; }
.number-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(72px, 1fr));
  gap: 8px;
}
.number-btn {
  border: 0;
  min-height: 40px;
  border-radius: 11px;
  background: #eef2f7;
  color: #111827;
  font-weight: 700;
  cursor: pointer;
}
.number-btn.selected { background: var(--blue); color: #fff; }
.number-btn:disabled { opacity: 0.45; cursor: not-allowed; }

.actions { padding: 12px; }
.action-row { display: grid; gap: 8px; }
.action-row + .action-row { margin-top: 8px; }
.action-row.three { grid-template-columns: repeat(3, 1fr); }
.action-row.two { grid-template-columns: repeat(2, 1fr); }
.btn {
  border: 0;
  border-radius: 12px;
  min-height: 42px;
  padding: 10px 12px;
  color: #fff;
  font-weight: 800;
  cursor: pointer;
}
.primary { background: var(--blue); }
.success { background: var(--green); }
.danger { background: var(--red); }
.danger-lite { background: #ff7043; }
.purple { background: var(--purple); }
.slate { background: var(--slate); }
.btn:active, .number-btn:active, .nav-btn:active { transform: translateY(1px); }

.screen-title-row {
  margin: 4px 2px 12px;
}
.screen-title-row h2 { margin: 0; font-size: 22px; }
.screen-title-row p { margin: 5px 0 0; color: var(--muted); font-size: 13px; }
.history-toolbar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 12px;
  margin-bottom: 12px;
}

.list-card { overflow: hidden; }
.empty-text {
  padding: 40px 16px;
  text-align: center;
  color: var(--muted);
}
.date-header {
  padding: 10px 14px;
  background: #f3f4f6;
  color: var(--muted);
  font-weight: 800;
  font-size: 13px;
}
.record-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 13px 14px;
  border-top: 1px solid var(--line);
}
.record-main { cursor: pointer; }
.record-time { font-size: 12px; color: var(--muted); margin-bottom: 5px; }
.record-numbers { color: var(--blue); font-weight: 800; letter-spacing: 0.4px; }
.record-actions { display: flex; gap: 6px; }
.small-btn {
  border: 0;
  border-radius: 8px;
  color: #fff;
  padding: 7px 9px;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 12px;
}
.stat-item {
  min-height: 60px;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
}
.stat-item small { margin-top: 3px; font-size: 11px; }

.bottom-nav {
  position: fixed;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: min(100%, 540px);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  padding: 9px 12px calc(9px + env(safe-area-inset-bottom));
  background: rgba(255,255,255,0.95);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.nav-btn {
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--muted);
  padding: 10px 6px;
  font-weight: 800;
  cursor: pointer;
}
.nav-btn.active { background: #e3f2fd; color: var(--blue); }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(78px + env(safe-area-inset-bottom));
  transform: translateX(-50%) translateY(20px);
  max-width: min(92vw, 500px);
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(17, 24, 39, 0.92);
  color: #fff;
  opacity: 0;
  pointer-events: none;
  transition: 180ms ease;
  font-size: 14px;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (min-width: 560px) {
  body { background: #e5edf7; }
  .app-shell { box-shadow: 0 0 0 1px rgba(0,0,0,0.04), 0 30px 70px rgba(0,0,0,0.12); }
}