/* AX Knowledge Brain — 프리미엄 화이트 테마 */

/* ===== 디자인 토큰 ===== */
:root {
  /* 브랜드 — 인디고 + 바이올렛 */
  --primary:        #4f46e5;
  --primary-hover:  #4338ca;
  --primary-light:  #eef2ff;
  --primary-border: #c7d2fe;

  --secondary:        #7c3aed;
  --secondary-light:  #f5f3ff;
  --secondary-border: #ddd6fe;

  /* 성공 / 경고 / 위험 */
  --success:        #059669;
  --success-light:  #ecfdf5;
  --success-border: #a7f3d0;

  --warning:        #d97706;
  --warning-light:  #fffbeb;
  --warning-border: #fde68a;

  --danger:         #dc2626;
  --danger-light:   #fef2f2;
  --danger-border:  #fecaca;

  --info:           #0891b2;
  --info-light:     #ecfeff;
  --info-border:    #a5f3fc;

  --gold:           #b45309;
  --gold-light:     #fffbeb;
  --gold-border:    #fde68a;

  /* 텍스트 */
  --text-primary:   #0f172a;
  --text-secondary: #334155;
  --text-muted:     #64748b;
  --text-disabled:  #94a3b8;

  /* 서피스 */
  --bg-page:        #f8fafc;
  --bg-surface:     #ffffff;
  --bg-subtle:      #f1f5f9;
  --bg-hover:       #f8fafc;

  /* 보더 */
  --border:         #e2e8f0;
  --border-strong:  #cbd5e1;

  /* 그림자 */
  --shadow-xs: 0 1px 2px rgba(15,23,42,0.06);
  --shadow-sm: 0 1px 4px rgba(15,23,42,0.08), 0 1px 2px rgba(15,23,42,0.04);
  --shadow-md: 0 4px 16px rgba(15,23,42,0.08), 0 2px 4px rgba(15,23,42,0.04);
  --shadow-lg: 0 10px 32px rgba(15,23,42,0.10), 0 4px 8px rgba(15,23,42,0.04);
  --shadow-xl: 0 20px 60px rgba(15,23,42,0.12);

  /* 브랜드 그라디언트 */
  --grad-brand:  linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  --grad-hero:   linear-gradient(135deg, #f8faff 0%, #eef2ff 50%, #f5f3ff 100%);
  --grad-card:   linear-gradient(160deg, #ffffff 0%, #f8fafc 100%);

  /* 반경 */
  --radius-sm: 8px;
  --radius:    12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Pretendard', 'Noto Sans KR', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ===== 네비게이션 ===== */
.navbar {
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
  padding: 0 28px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.navbar-brand .logo-icon {
  width: 32px;
  height: 32px;
  background: var(--grad-brand);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
  box-shadow: 0 2px 8px rgba(79,70,229,0.3);
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 1px;
  list-style: none;
  flex: 1;
  justify-content: center;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.nav-link:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.nav-link.active {
  background: var(--primary-light);
  color: var(--primary);
  box-shadow: inset 0 0 0 1px var(--primary-border);
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  background: var(--grad-brand);
  color: white !important;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 700;
  text-decoration: none;
  transition: opacity 0.15s, transform 0.15s, box-shadow 0.15s;
  box-shadow: 0 2px 8px rgba(79,70,229,0.25);
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-btn:hover {
  opacity: 0.92;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(79,70,229,0.35);
}

/* nav 구분선 */
.nav-sep {
  width: 1px;
  height: 16px;
  background: var(--border);
  margin: 0 6px;
  align-self: center;
  padding: 0 !important;
  flex-shrink: 0;
}

/* ===== 카드 ===== */
.card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.card-blue   { border-left: 4px solid var(--primary);  background: linear-gradient(135deg, var(--primary-light) 0%, #fff 50%); }
.card-orange { border-left: 4px solid var(--warning);  background: linear-gradient(135deg, var(--warning-light) 0%, #fff 50%); }
.card-green  { border-left: 4px solid var(--success);  background: linear-gradient(135deg, var(--success-light) 0%, #fff 50%); }
.card-purple { border-left: 4px solid var(--secondary); background: linear-gradient(135deg, var(--secondary-light) 0%, #fff 50%); }
.card-teal   { border-left: 4px solid var(--info);     background: linear-gradient(135deg, var(--info-light) 0%, #fff 50%); }
.card-gold   { border-left: 4px solid var(--gold);     background: linear-gradient(135deg, var(--gold-light) 0%, #fff 50%); }

/* ===== 버튼 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--grad-brand);
  color: white;
  box-shadow: 0 2px 8px rgba(79,70,229,0.25);
}
.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(79,70,229,0.35);
}

.btn-secondary {
  background: white;
  color: var(--primary);
  border: 2px solid var(--primary-border);
}
.btn-secondary:hover {
  background: var(--primary-light);
  border-color: var(--primary);
}

.btn-success { background: var(--success); color: white; box-shadow: 0 2px 8px rgba(5,150,105,0.25); }
.btn-success:hover { opacity: 0.9; transform: translateY(-1px); }

.btn-warning { background: var(--warning); color: white; }
.btn-warning:hover { opacity: 0.9; transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--bg-subtle); border-color: var(--border-strong); }

.btn-lg { padding: 13px 28px; font-size: 0.95rem; border-radius: var(--radius); }
.btn-sm { padding: 5px 13px; font-size: 0.78rem; }

/* ===== 폼 ===== */
.form-group { margin-bottom: 20px; }

.form-label {
  display: block;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  font-size: 0.85rem;
}

.form-control {
  width: 100%;
  padding: 9px 13px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-primary);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

textarea.form-control { resize: vertical; min-height: 120px; }

/* ===== 탭 ===== */
.tabs { border-bottom: 1.5px solid var(--border); display: flex; gap: 0; }

.tab-btn {
  padding: 10px 20px;
  border: none;
  background: none;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2.5px solid transparent;
  margin-bottom: -1.5px;
  transition: all 0.15s;
}
.tab-btn:hover { color: var(--primary); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===== 배지 ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
}
.badge-blue   { background: var(--primary-light);   color: var(--primary);   border: 1px solid var(--primary-border); }
.badge-orange { background: var(--warning-light);   color: var(--warning);   border: 1px solid var(--warning-border); }
.badge-green  { background: var(--success-light);   color: var(--success);   border: 1px solid var(--success-border); }
.badge-purple { background: var(--secondary-light); color: var(--secondary); border: 1px solid var(--secondary-border); }
.badge-teal   { background: var(--info-light);      color: var(--info);      border: 1px solid var(--info-border); }
.badge-gold   { background: var(--gold-light);      color: var(--gold);      border: 1px solid var(--gold-border); }

/* ===== 토스트 ===== */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 13px 18px;
  border-radius: var(--radius);
  background: white;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideInRight 0.25s cubic-bezier(0.34,1.56,0.64,1);
  min-width: 280px;
  max-width: 400px;
  font-size: 0.875rem;
}
.toast.success { border-left-color: var(--success); }
.toast.error   { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

@keyframes slideInRight {
  from { transform: translateX(100%) scale(0.9); opacity: 0; }
  to   { transform: translateX(0) scale(1); opacity: 1; }
}

/* ===== 로딩 ===== */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9998;
}

.spinner {
  width: 44px;
  height: 44px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 푸터 ===== */
.footer {
  background: #0f172a;
  color: #64748b;
  padding: 44px 24px 28px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto 32px;
}

.footer-brand { font-size: 1.05rem; font-weight: 800; color: white; margin-bottom: 10px; }
.footer-desc  { font-size: 0.85rem; line-height: 1.75; color: #475569; }
.footer-title { color: #94a3b8; font-weight: 700; margin-bottom: 14px; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em; }
.footer-link  { display: block; color: #475569; text-decoration: none; font-size: 0.85rem; margin-bottom: 9px; transition: color 0.15s; }
.footer-link:hover { color: white; }

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 24px;
  font-size: 0.82rem;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.btn-manual {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 18px;
  background: linear-gradient(135deg, var(--warning), #fbbf24);
  color: white;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.82rem;
  text-decoration: none;
  transition: all 0.15s;
  box-shadow: 0 2px 8px rgba(217,119,6,0.3);
}
.btn-manual:hover { transform: translateY(-2px); box-shadow: 0 4px 14px rgba(217,119,6,0.4); }

/* ===== 컨테이너 ===== */
.container    { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 800px;  margin: 0 auto; padding: 0 24px; }

/* ===== 그리드 ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ===== 페이지 헤더 ===== */
.page-header {
  background: var(--grad-hero);
  border-bottom: 1px solid var(--primary-border);
  padding: 56px 24px;
  text-align: center;
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.03em;
}
.page-header p {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
}

/* ===== 모바일 햄버거 ===== */
.nav-hamburger {
  display: none;
  background: none;
  border: 1px solid var(--border);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 5px 9px;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  transition: background 0.15s;
}
.nav-hamburger:hover { background: var(--bg-subtle); }

.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.4);
  backdrop-filter: blur(2px);
  z-index: 200;
}
.mobile-nav-overlay.open { display: block; }

.mobile-nav-drawer {
  position: fixed;
  top: 0; left: -280px;
  width: 280px; height: 100vh;
  background: white;
  z-index: 201;
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  transition: left 0.25s cubic-bezier(0.16,1,0.3,1);
  overflow-y: auto;
}
.mobile-nav-drawer.open { left: 0; }

.mobile-nav-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.mobile-nav-close {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  cursor: pointer;
  font-size: 1rem;
  color: var(--text-secondary);
}

.mobile-nav-links {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.mobile-nav-link {
  display: block;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.12s;
}
.mobile-nav-link:hover, .mobile-nav-link.active {
  background: var(--primary-light);
  color: var(--primary);
}

/* ===== 반응형 ===== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .navbar-nav { display: none; }
  .nav-hamburger { display: flex; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .page-header h1 { font-size: 1.5rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}

/* ===== 인쇄 ===== */
@media print {
  .navbar, .footer, .no-print { display: none !important; }
  body { background: white; }
  .card { box-shadow: none; border: 1px solid #ddd; }
  * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}