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

:root {
  --primary: #e63946;
  --primary-dark: #c1121f;
  --bg: #f8f9fa;
  --card-bg: #ffffff;
  --text: #212529;
  --muted: #6c757d;
  --radius: 16px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 16px 40px;
}

.container {
  width: 100%;
  max-width: 480px;
}

header {
  text-align: center;
  margin-bottom: 32px;
}

h1 {
  font-size: clamp(1.6rem, 5vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text);
}

.subtitle {
  margin-top: 6px;
  font-size: 0.9rem;
  color: var(--muted);
}

.btn-generate {
  display: block;
  width: 100%;
  padding: 18px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  box-shadow: 0 4px 14px rgba(230, 57, 70, 0.4);
}

.btn-generate:hover {
  background: var(--primary-dark);
}

.btn-generate:active {
  transform: scale(0.98);
}

.hidden {
  display: none;
}

.results {
  margin-top: 28px;
}

.set-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 16px;
  animation: slideUp 0.3s ease both;
}

.set-card:nth-child(1) { animation-delay: 0.05s; }
.set-card:nth-child(2) { animation-delay: 0.10s; }
.set-card:nth-child(3) { animation-delay: 0.15s; }
.set-card:nth-child(4) { animation-delay: 0.20s; }
.set-card:nth-child(5) { animation-delay: 0.25s; }

@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.set-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 14px;
}

.balls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.ball {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: #fff;
  flex-shrink: 0;
}

/* 로또 번호대별 색상 */
.ball.r1  { background: #f4a628; } /* 1-10  노랑 */
.ball.r2  { background: #4b89dc; } /* 11-20 파랑 */
.ball.r3  { background: #e63946; } /* 21-30 빨강 */
.ball.r4  { background: #666;    } /* 31-40 회색 */
.ball.r5  { background: #5cb85c; } /* 41-45 초록 */

.set-meta {
  margin-top: 12px;
  font-size: 0.78rem;
  color: var(--muted);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-regenerate {
  display: block;
  width: 100%;
  margin-top: 8px;
  padding: 14px;
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.btn-regenerate:hover {
  background: var(--primary);
  color: #fff;
}

footer {
  text-align: center;
  margin-top: 36px;
  font-size: 0.78rem;
  color: var(--muted);
}