:root {
  color-scheme: light;
  --bg-color: #f6f3ee;
  --bg-accent: #f0e7dc;
  --surface-color: #ffffff;
  --surface-border: rgba(28, 33, 41, 0.1);
  --text-primary: #1c2129;
  --text-muted: #4f5a66;
  --ball-color: #2d8b57;
  --ball-text: #f8f7f4;
  --button-bg: #1c6ee8;
  --button-bg-hover: #1659b8;
  --toggle-bg: #f2eadf;
  --toggle-text: #253142;
  --shadow-color: rgba(28, 33, 41, 0.12);
}

[data-theme='dark'] {
  color-scheme: dark;
  --bg-color: #101318;
  --bg-accent: #1c2230;
  --surface-color: #171b22;
  --surface-border: rgba(242, 242, 246, 0.08);
  --text-primary: #f2f2f6;
  --text-muted: #b6bfca;
  --ball-color: #4aa36f;
  --ball-text: #f8f7f4;
  --button-bg: #6aa9ff;
  --button-bg-hover: #4f8fe0;
  --toggle-bg: rgba(255, 255, 255, 0.08);
  --toggle-text: #f2f2f6;
  --shadow-color: rgba(0, 0, 0, 0.35);
}

body {
  font-family: 'Trebuchet MS', 'Segoe UI', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background-color: var(--bg-color);
  background-image:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.5), transparent 45%),
    radial-gradient(circle at 20% 20%, var(--bg-accent), transparent 55%);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  text-align: center;
  background-color: var(--surface-color);
  padding: 40px;
  border-radius: 10px;
  border: 1px solid var(--surface-border);
  box-shadow: 0 18px 40px var(--shadow-color);
  width: min(520px, 90vw);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

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

h1 {
  margin-bottom: 30px;
  color: var(--text-primary);
  font-size: 28px;
  letter-spacing: 0.5px;
}

.lotto-numbers {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
  gap: 8px;
  flex-wrap: wrap;
}

.lotto-numbers span {
  display: inline-block;
  width: 50px;
  height: 50px;
  line-height: 50px;
  margin: 0 10px;
  border-radius: 50%;
  background-color: var(--ball-color);
  color: var(--ball-text);
  font-size: 24px;
  font-weight: bold;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.15);
}

.generate-btn {
  padding: 15px 30px;
  font-size: 18px;
  color: #fff;
  background-color: var(--button-bg);
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.2s ease;
}

.generate-btn:hover {
  background-color: var(--button-bg-hover);
  transform: translateY(-1px);
}

.theme-toggle {
  padding: 8px 14px;
  font-size: 14px;
  color: var(--toggle-text);
  background-color: var(--toggle-bg);
  border: 1px solid var(--surface-border);
  border-radius: 999px;
  cursor: pointer;
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

@media (max-width: 520px) {
  .header {
    flex-direction: column;
    align-items: flex-start;
  }

  h1 {
    margin-bottom: 12px;
  }
}
}