:root {
  color-scheme: light;
  --bg-top: #f7f1d5;
  --bg-bottom: #f2c078;
  --bg-glow: rgba(255, 255, 255, 0.6);
  --card-bg: rgba(255, 252, 245, 0.92);
  --text-main: #1f2933;
  --text-soft: #52606d;
  --accent: #c05621;
  --accent-dark: #9c4221;
  --ball-bg: #fff4d6;
  --ball-border: #e7b95b;
  --bonus-bg: #ffe0cc;
  --button-text: #fff;
  --toggle-bg: rgba(255, 255, 255, 0.72);
  --toggle-border: rgba(192, 86, 33, 0.18);
  --toggle-shadow: 0 10px 24px rgba(192, 86, 33, 0.12);
  --card-shadow: 0 20px 60px rgba(101, 67, 33, 0.18);
  --ball-shadow: inset 0 -6px 12px rgba(192, 120, 30, 0.14);
  --button-shadow: 0 14px 24px rgba(156, 66, 33, 0.24);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg-top: #122033;
  --bg-bottom: #050814;
  --bg-glow: rgba(113, 155, 214, 0.14);
  --card-bg: rgba(10, 18, 32, 0.82);
  --text-main: #f3f7fb;
  --text-soft: #b7c5d8;
  --accent: #ffb04c;
  --accent-dark: #ff8b3d;
  --ball-bg: #17263a;
  --ball-border: #335177;
  --bonus-bg: #3d2135;
  --button-text: #101725;
  --toggle-bg: rgba(20, 32, 50, 0.78);
  --toggle-border: rgba(255, 176, 76, 0.2);
  --toggle-shadow: 0 14px 32px rgba(4, 10, 23, 0.4);
  --card-shadow: 0 28px 70px rgba(2, 6, 20, 0.45);
  --ball-shadow: inset 0 -6px 12px rgba(4, 10, 23, 0.35);
  --button-shadow: 0 16px 28px rgba(255, 139, 61, 0.24);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Noto Sans KR", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top, var(--bg-glow), transparent 30%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  transition: background 0.25s ease, color 0.25s ease;
}

.app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.lotto-card {
  width: min(100%, 560px);
  padding: 32px;
  border-radius: 28px;
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(10px);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

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

.eyebrow,
.label {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.theme-toggle {
  padding: 10px 16px;
  border: 1px solid var(--toggle-border);
  border-radius: 999px;
  background: var(--toggle-bg);
  color: var(--text-main);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--toggle-shadow);
  transition: transform 0.18s ease, background 0.2s ease, border-color 0.2s ease;
}

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

h1 {
  margin: 10px 0 12px;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.05;
}

.description {
  margin: 0 0 28px;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-soft);
}

.numbers-wrap {
  display: grid;
  gap: 20px;
}

.numbers,
.bonus {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.ball {
  width: 58px;
  height: 58px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 2px solid var(--ball-border);
  background: var(--ball-bg);
  font-size: 1.1rem;
  font-weight: 800;
  box-shadow: var(--ball-shadow);
}

.bonus-ball {
  background: var(--bonus-bg);
  border-color: #dd6b20;
}

.generate-button {
  width: 100%;
  margin-top: 28px;
  padding: 16px 20px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--button-text);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  box-shadow: var(--button-shadow);
}

.generate-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 30px rgba(156, 66, 33, 0.28);
}

.generate-button:active {
  transform: translateY(1px);
}

@media (max-width: 640px) {
  .lotto-card {
    padding: 24px;
  }

  .card-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .theme-toggle {
    width: 100%;
    justify-content: center;
  }

  .ball {
    width: 50px;
    height: 50px;
  }
}