:root {
  color-scheme: light;
  --bg-start: #fff7ed;
  --bg-end: #fde68a;
  --card-bg: rgba(255, 255, 255, 0.82);
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #ea580c;
  --accent-dark: #c2410c;
  --ball-start: #fb923c;
  --ball-end: #f97316;
  --toggle-bg: rgba(255, 255, 255, 0.72);
  --toggle-border: rgba(194, 65, 12, 0.18);
  --shadow: 0 24px 60px rgba(120, 53, 15, 0.16);
}

body.dark {
  color-scheme: dark;
  --bg-start: #111827;
  --bg-end: #020617;
  --card-bg: rgba(15, 23, 42, 0.8);
  --text: #f8fafc;
  --muted: #cbd5e1;
  --accent: #f59e0b;
  --accent-dark: #ea580c;
  --ball-start: #38bdf8;
  --ball-end: #2563eb;
  --toggle-bg: rgba(30, 41, 59, 0.88);
  --toggle-border: rgba(148, 163, 184, 0.2);
  --shadow: 0 24px 60px rgba(2, 6, 23, 0.45);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  font-family: "Noto Sans KR", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.16), transparent 35%),
    linear-gradient(135deg, var(--bg-start), var(--bg-end));
  transition: background 0.25s ease, color 0.25s ease;
}

.app {
  width: min(100%, 520px);
}

.lotto-card {
  padding: 32px;
  border-radius: 28px;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  text-align: center;
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.eyebrow {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.theme-toggle {
  border: 1px solid var(--toggle-border);
  border-radius: 999px;
  padding: 10px 14px;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text);
  background: var(--toggle-bg);
  cursor: pointer;
}

h1 {
  margin: 20px 0 0;
  font-size: clamp(2rem, 5vw, 2.8rem);
}

.description {
  margin: 12px 0 28px;
  color: var(--muted);
}

.numbers {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}

.ball {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border-radius: 999px;
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--ball-start), var(--ball-end));
  box-shadow: inset 0 2px 10px rgba(255, 255, 255, 0.25);
}

.ball.placeholder {
  color: rgba(255, 255, 255, 0.7);
}

.actions {
  display: flex;
  justify-content: center;
}

.draw-button {
  border: 0;
  border-radius: 999px;
  padding: 14px 24px;
  font: inherit;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease;
  box-shadow: 0 14px 28px rgba(234, 88, 12, 0.28);
}

.draw-button:hover,
.theme-toggle:hover {
  transform: translateY(-1px);
}

.draw-button:active,
.theme-toggle:active {
  transform: translateY(1px) scale(0.99);
}

@media (max-width: 480px) {
  .lotto-card {
    padding: 24px;
  }

  .top-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .numbers {
    gap: 10px;
  }
}