/* =====================================================
   초강스 - 공통 스타일
   ===================================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700;900&display=swap');

:root {
  --primary: #2D3A8C;       /* 딥 블루 */
  --primary-light: #4A5AC7;
  --primary-dark: #1a2468;
  --accent: #FF6B35;        /* 오렌지 포인트 */
  --accent-light: #FF8C5A;
  --success: #22C55E;
  --warning: #F59E0B;
  --danger: #EF4444;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-500: #64748B;
  --gray-700: #334155;
  --gray-900: #0F172A;
  --white: #FFFFFF;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.14);
  --radius: 12px;
  --radius-lg: 20px;
}

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

body {
  font-family: 'Noto Sans KR', sans-serif;
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.6;
}

/* ── 버튼 ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  text-decoration: none;
}
.btn-primary {
  background: var(--primary);
  color: white;
}
.btn-primary:hover { background: var(--primary-light); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-accent {
  background: var(--accent);
  color: white;
}
.btn-accent:hover { background: var(--accent-light); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-outline {
  background: white;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-success { background: var(--success); color: white; }
.btn-sm { padding: 6px 14px; font-size: 13px; border-radius: 8px; }
.btn-full { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* ── 카드 ── */
.card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
}
.card-body { padding: 24px; }
.card-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ── 폼 ── */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 8px;
}
.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: 'Noto Sans KR', sans-serif;
  transition: border-color 0.2s;
  outline: none;
  background: white;
}
.form-input:focus { border-color: var(--primary); }
.form-input::placeholder { color: var(--gray-300); }
textarea.form-input { resize: vertical; min-height: 100px; }
select.form-input { cursor: pointer; }

/* ── 배지 ── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
}
.badge-paid { background: #DCFCE7; color: #16A34A; }
.badge-pending { background: #FEF9C3; color: #B45309; }
.badge-refund { background: #DBEAFE; color: #1D4ED8; }
.badge-free { background: #F3E8FF; color: #7C3AED; }
.badge-admin { background: #FEE2E2; color: #DC2626; }
.badge-teacher { background: #E0F2FE; color: #0369A1; }

/* ── 네비게이션 ── */
.navbar {
  background: white;
  border-bottom: 1px solid var(--gray-200);
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.navbar-logo {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 16px;
  font-weight: 900;
}
.navbar-title {
  font-size: 20px;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: -0.5px;
}
.navbar-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}
.navbar-menu a {
  padding: 8px 16px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--gray-700);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}
.navbar-menu a:hover, .navbar-menu a.active {
  background: var(--gray-100);
  color: var(--primary);
}
.navbar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--gray-700);
}
.navbar-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

/* ── 레이아웃 ── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.page-body { padding: 32px 0; }

/* ── 통계 카드 ── */
.stat-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}
.stat-number {
  font-size: 32px;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
}
.stat-label {
  font-size: 13px;
  color: var(--gray-500);
  margin-top: 6px;
}
.stat-icon {
  font-size: 24px;
  margin-bottom: 12px;
}

/* ── 테이블 ── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th {
  background: var(--gray-50);
  padding: 12px 16px;
  text-align: left;
  font-size: 13px;
  font-weight: 700;
  color: var(--gray-500);
  border-bottom: 2px solid var(--gray-200);
}
td {
  padding: 14px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
}
tr:hover td { background: var(--gray-50); }

/* ── 로딩 ── */
.loading-screen {
  position: fixed;
  inset: 0;
  background: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}
.spinner {
  width: 44px;
  height: 44px;
  border: 4px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── 토스트 알림 ── */
.toast-container {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  background: white;
  border-radius: var(--radius);
  padding: 14px 20px;
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--primary);
  font-size: 14px;
  font-weight: 500;
  min-width: 260px;
  animation: slideIn 0.3s ease;
}
.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }
.toast.warning { border-color: var(--warning); }
@keyframes slideIn { from { transform: translateX(100px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ── 빈 상태 ── */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--gray-500);
}
.empty-state-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state h3 { font-size: 18px; font-weight: 700; color: var(--gray-700); margin-bottom: 8px; }
.empty-state p { font-size: 14px; }

/* ── 모달 ── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal {
  background: white;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.25s ease;
}
@keyframes modalIn { from { transform: scale(0.95); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-title { font-size: 18px; font-weight: 700; }
.modal-close {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--gray-500);
  padding: 4px;
}
.modal-body { padding: 24px; }
.modal-footer {
  padding: 16px 24px 20px;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* ── 반응형 ── */
@media (max-width: 768px) {
  .navbar { padding: 0 16px; }
  .container { padding: 0 16px; }
  .navbar-menu { display: none; }
  .card-body { padding: 16px; }
  .stat-number { font-size: 24px; }
}

/* ── 그리드 헬퍼 ── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 900px) { .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.text-sm { font-size: 13px; }
.text-muted { color: var(--gray-500); }
.fw-bold { font-weight: 700; }
.text-center { text-align: center; }