:root {
  --bg: #0b1020;
  --surface: #141b2f;
  --surface-2: #1c2540;
  --text: #eef2ff;
  --muted: #9aa6c2;
  --gold: #f5c542;
  --gold-dark: #c9971a;
  --accent: #5b8cff;
  --ball-border: rgba(255, 255, 255, 0.15);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Pretendard", "Noto Sans KR", "Malgun Gothic", sans-serif;
  background:
    radial-gradient(circle at top, rgba(91, 140, 255, 0.18), transparent 35%),
    radial-gradient(circle at 80% 20%, rgba(245, 197, 66, 0.12), transparent 25%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.page {
  width: min(1100px, 92vw);
  margin: 0 auto;
  padding: 32px 0 64px;
}

.hero {
  text-align: center;
  margin-bottom: 28px;
}

.hero__badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(245, 197, 66, 0.12);
  color: var(--gold);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.hero__desc {
  color: var(--muted);
  margin: 0 0 20px;
}

.hero__actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  border: none;
  border-radius: 12px;
  padding: 12px 20px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

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

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.btn--primary {
  background: var(--accent);
  color: white;
}

.btn--gold {
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: #1a1200;
}

.btn--outline {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.status-text {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.95rem;
}

.panel {
  background: rgba(20, 27, 47, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 20px;
  padding: 22px;
  margin-bottom: 22px;
  box-shadow: var(--shadow);
}

.panel__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.panel h2 {
  margin: 0;
  font-size: 1.25rem;
}

.panel__meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 12px 10px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  white-space: nowrap;
}

th {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.9rem;
}

.numbers {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.ball {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.92rem;
  color: #111;
  border: 2px solid var(--ball-border);
  box-shadow: inset 0 -3px 6px rgba(0, 0, 0, 0.15);
}

.ball--yellow { background: #f5c542; }
.ball--blue { background: #5b8cff; color: white; }
.ball--red { background: #ef5b5b; color: white; }
.ball--gray { background: #8d96ab; color: white; }
.ball--green { background: #49b86d; color: white; }
.ball--bonus {
  background: transparent;
  color: var(--gold);
  border-color: var(--gold);
  box-shadow: none;
}

.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.page-btn {
  min-width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: var(--surface-2);
  color: var(--text);
  cursor: pointer;
}

.page-btn.active {
  background: var(--accent);
  border-color: var(--accent);
}

.predict-list {
  display: grid;
  gap: 14px;
}

.predict-card {
  background: var(--surface-2);
  border-radius: 16px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.predict-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.predict-card p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.9rem;
}

.hot-cold {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.hot-cold__box {
  background: var(--surface-2);
  border-radius: 14px;
  padding: 14px;
}

.hot-cold__box h4 {
  margin: 0 0 10px;
  font-size: 0.95rem;
  color: var(--muted);
}

.disclaimer {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.backtest-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.backtest-card {
  background: var(--surface-2);
  border-radius: 14px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.backtest-card h4 {
  margin: 0 0 8px;
  font-size: 0.9rem;
  color: var(--muted);
}

.backtest-card .value {
  font-size: 1.5rem;
  font-weight: 700;
}

.backtest-card.engine .value {
  color: var(--gold);
}

.backtest-card.random .value {
  color: var(--accent);
}

.backtest-card.diff.positive .value {
  color: #49b86d;
}

.backtest-card.diff.negative .value {
  color: #ef5b5b;
}

.backtest-samples {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}

.backtest-sample {
  background: var(--surface-2);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 0.9rem;
}

.backtest-sample strong {
  color: var(--gold);
}

.loading {
  position: fixed;
  inset: 0;
  background: rgba(7, 10, 18, 0.72);
  display: grid;
  place-items: center;
  z-index: 100;
}

.loading[hidden] {
  display: none !important;
}

.loading__box {
  background: var(--surface);
  border-radius: 16px;
  padding: 28px 32px;
  text-align: center;
  min-width: 260px;
}

.spinner {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 4px solid rgba(255, 255, 255, 0.12);
  border-top-color: var(--gold);
  margin: 0 auto 14px;
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 640px) {
  th:nth-child(5),
  td:nth-child(5) {
    display: none;
  }
}