:root {
    --bg-color: #f0f4f8;
    --card-bg: white;
    --text-color: #2c3e50;
    --text-muted: #6b7a90;
    --border-color: #eef2f6;
    --input-border: #ddd;
    --input-bg: white;
    --btn-primary: #4a90e2;
    --btn-secondary-bg: #eef2f6;
    --btn-secondary-text: #2c3e50;
    --badge-bg: #ffffff;
    --badge-shadow: rgba(0, 0, 0, 0.05);
    --tab-bg: #eee;
    --tab-text: #333;
    --tab-active-bg: #2c3e50;
    --tab-active-text: white;
    --table-border: #eee;
    --warn-bg: #fff6e5;
    --warn-border: #ffd89a;
    --warn-text: #7a4b00;
    --game-card-hover: #4a90e2;
  }
  
  [data-theme="dark"] {
    --bg-color: #1a1a2e;
    --card-bg: #16213e;
    --text-color: #eaeaea;
    --text-muted: #a0a0a0;
    --border-color: #2a2a4a;
    --input-border: #3a3a5a;
    --input-bg: #1a1a2e;
    --btn-primary: #4a90e2;
    --btn-secondary-bg: #2a2a4a;
    --btn-secondary-text: #eaeaea;
    --badge-bg: #2a2a4a;
    --badge-shadow: rgba(0, 0, 0, 0.3);
    --tab-bg: #2a2a4a;
    --tab-text: #ccc;
    --tab-active-bg: #4a90e2;
    --tab-active-text: white;
    --table-border: #3a3a5a;
    --warn-bg: #3a2a1a;
    --warn-border: #5a4a2a;
    --warn-text: #ffd89a;
    --game-card-hover: #4a90e2;
  }
  
  * { box-sizing: border-box; }
  
  body {
    font-family: 'Pretendard', sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px;
    transition: background 0.3s, color 0.3s;
  }
  
  .container {
    width: 95%;
    max-width: 1000px;
    text-align: center;
  }
  
  .card {
    text-align: center;
    background: var(--card-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 25px var(--badge-shadow);
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
  }
  
  .row {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .muted {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.4;
  }
  
  .divider {
    height: 1px;
    background: var(--border-color);
    margin: 18px 0;
  }
  
  input[type="email"],
  input[type="password"],
  input[type="text"] {
    padding: 14px;
    font-size: 1rem;
    border-radius: 10px;
    border: 2px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-color);
    width: 100%;
    margin-bottom: 10px;
  }
  
  button {
    padding: 14px 18px;
    border: none;
    border-radius: 10px;
    background: var(--btn-primary);
    color: white;
    font-weight: 800;
    cursor: pointer;
    width: 100%;
  }
  
  button.secondary {
    background: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
  }
  
  button.inline {
    width: auto;
    padding: 10px 14px;
    border-radius: 10px;
  }
  
  .small {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 10px;
  }
  
  /* auth tabs */
  .auth-tabs {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 12px;
  }
  
  .auth-tab {
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    background: var(--btn-secondary-bg);
    font-weight: 900;
    color: var(--text-color);
  }
  
  .auth-tab.active {
    background: var(--tab-active-bg);
    color: var(--tab-active-text);
    border-color: var(--tab-active-bg);
  }
  
  .auth-panel {
    display: none;
    margin-top: 14px;
  }
  .auth-panel.active {
    display: block;
  }
  
  /* member page */
  .topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 10px;
  }
  
  .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border-radius: 12px;
    background: var(--badge-bg);
    box-shadow: 0 5px 15px var(--badge-shadow);
    color: var(--text-color);
    font-weight: 700;
  }
  
  .warn {
    background: var(--warn-bg);
    border: 1px solid var(--warn-border);
    color: var(--warn-text);
    padding: 12px;
    border-radius: 12px;
    margin: 12px 0 0 0;
    text-align: left;
    line-height: 1.4;
    font-size: 0.95rem;
  }
  
  .menu-container {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin: 30px 0;
    flex-wrap: wrap;
  }
  
  .game-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 15px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 900;
    box-shadow: 0 5px 15px var(--badge-shadow);
    transition: 0.3s;
    width: 140px;
    display: inline-block;
  }
  .game-card:hover {
    transform: translateY(-10px);
    background: var(--game-card-hover);
    color: white;
  }
  
  .leaderboard {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 5px 15px var(--badge-shadow);
    margin-top: 20px;
  }
  
  .tabs {
    margin-bottom: 15px;
  }
  
  .tab-btn {
    background: var(--tab-bg);
    color: var(--tab-text);
    padding: 12px 15px;
    margin: 5px 5px;
    cursor: pointer;
    border-radius: 8px;
    border: none;
    width: auto;
    font-weight: 900;
  }
  .tab-btn.active {
    background: var(--tab-active-bg);
    color: var(--tab-active-text);
  }
  
  table {
    width: 100%;
    border-collapse: collapse;
  }
  th, td {
    padding: 10px;
    border-bottom: 1px solid var(--table-border);
    text-align: center;
  }
  
  .msg {
    min-height: 20px;
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--text-color);
  }
  .msg.error {
    color: #c0392b;
  }

  /* 자세히보기 버튼 */
  .detail-btn {
    padding: 6px 12px;
    font-size: 0.8rem;
    font-weight: 700;
    background: var(--btn-primary);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.2s;
    width: auto;
  }
  
  .detail-btn:hover {
    background: #357abd;
    transform: scale(1.05);
  }
  
  /* 상세정보 행 */
  .detail-row {
    background: var(--btn-secondary-bg);
  }
  
  .detail-row td {
    padding: 0;
  }
  
  .detail-content {
    padding: 12px 16px;
    text-align: left;
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
  }
  
  .detail-item {
    display: flex;
    gap: 6px;
    align-items: center;
  }
  
  .detail-label {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.85rem;
  }
  
  .detail-value {
    color: var(--text-color);
    font-weight: 700;
    font-size: 0.9rem;
  }

  /* 로딩 오버레이 스타일 */
.loader-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4); /* 배경을 어둡게 */
  backdrop-filter: blur(4px);    /* 배경 살짝 흐리게 (고급스러움) */
  display: none;                 /* 기본값은 숨김 */
  align-items: center;
  justify-content: center;
  z-index: 9999;                 /* 최상단에 배치 */
}

/* 스피너 애니메이션 */
.spinner {
  width: 50px;
  height: 50px;
  border: 5px solid rgba(255, 255, 255, 0.3);
  border-top: 5px solid var(--btn-primary); /* 메인 컬러 사용 */
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}