/* ============================================
   공통 디자인 시스템 - styles.css
   ============================================ */

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* 컬러 시스템 */
  --primary: #4F46E5;
  --primary-light: #6366F1;
  --accent: #22C55E;
  --text-strong: #111827;
  --text-muted: #6B7280;
  --bg: #F9FAFB;
  --card-bg: #FFFFFF;
  --border: #E5E7EB;
  --error: #EF4444;
  --warning: #F59E0B;
  --success: #22C55E;
  
  /* 타이포그래피 */
  --font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --h1-size: 32px;
  --h2-size: 24px;
  --body-size: 16px;
  --small-size: 13px;
  
  /* 간격 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* Shadow */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
  font-family: var(--font-family);
  font-size: var(--body-size);
  color: var(--text-strong);
  background-color: var(--bg);
  line-height: 1.6;
}

/* 타이포그래피 */
h1 {
  font-size: var(--h1-size);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: var(--h2-size);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
}

small {
  font-size: var(--small-size);
  color: var(--text-muted);
}

/* ============================================
   Navigation Bar
   ============================================ */
.navbar {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: var(--spacing-md) var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.navbar-menu {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.navbar-link {
  color: var(--text-strong);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.navbar-link:hover {
  color: var(--primary);
}

.navbar-user {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* ============================================
   Sidebar (관리자용)
   ============================================ */
.sidebar {
  width: 260px;
  background-color: var(--card-bg);
  border-right: 1px solid var(--border);
  height: calc(100vh - 60px);
  position: fixed;
  left: 0;
  top: 60px;
  overflow-y: auto;
  padding: var(--spacing-lg);
}

.sidebar-menu {
  list-style: none;
}

.sidebar-item {
  margin-bottom: var(--spacing-xs);
}

.sidebar-link {
  display: block;
  padding: var(--spacing-md);
  color: var(--text-strong);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all 0.2s;
  font-weight: 500;
}

.sidebar-link:hover,
.sidebar-link.active {
  background-color: var(--primary);
  color: white;
}

/* ============================================
   Container & Layout
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

.container-with-sidebar {
  margin-left: 260px;
  padding: var(--spacing-lg);
}

.page-header {
  margin-bottom: var(--spacing-xl);
}

/* ============================================
   Card / Panel
   ============================================ */
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-lg);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border);
}

.card-title {
  font-size: var(--h2-size);
  font-weight: 600;
  margin: 0;
}

.card-body {
  margin-top: var(--spacing-md);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-block;
  padding: 12px 24px;
  font-size: var(--body-size);
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-family);
}

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

.btn-primary:hover {
  background-color: var(--primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background-color: var(--bg);
  border-color: var(--primary);
}

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

.btn-accent:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-sm {
  padding: 8px 16px;
  font-size: var(--small-size);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 18px;
}

/* ============================================
   Form Inputs
   ============================================ */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-strong);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: var(--body-size);
  font-family: var(--font-family);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--card-bg);
  color: var(--text-strong);
  transition: all 0.2s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-error {
  color: var(--error);
  font-size: var(--small-size);
  margin-top: var(--spacing-xs);
}

.form-help {
  color: var(--text-muted);
  font-size: var(--small-size);
  margin-top: var(--spacing-xs);
}

.radio-group,
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.radio-item,
.checkbox-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.radio-item input,
.checkbox-item input {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.radio-item label,
.checkbox-item label {
  cursor: pointer;
  user-select: none;
}

/* ============================================
   Alert Component
   ============================================ */
.alert {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid;
}

.alert-success {
  background-color: rgba(34, 197, 94, 0.1);
  border-color: var(--success);
  color: #15803d;
}

.alert-error {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: var(--error);
  color: #dc2626;
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.1);
  border-color: var(--warning);
  color: #d97706;
}

.alert-info {
  background-color: rgba(79, 70, 229, 0.1);
  border-color: var(--primary);
  color: var(--primary);
}

/* ============================================
   Progress Bar
   ============================================ */
.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: var(--spacing-md);
}

.progress-fill {
  height: 100%;
  background-color: var(--primary);
  transition: width 0.3s ease;
  border-radius: var(--radius-sm);
}

.progress-text {
  text-align: center;
  color: var(--text-muted);
  font-size: var(--small-size);
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   Table
   ============================================ */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--card-bg);
}

.table thead {
  background-color: var(--bg);
}

.table th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  color: var(--text-strong);
  border-bottom: 2px solid var(--border);
}

.table td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border);
}

.table tbody tr:hover {
  background-color: var(--bg);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

/* ============================================
   Chart Components
   ============================================ */
.chart-container {
  position: relative;
  height: 300px;
  margin: var(--spacing-lg) 0;
}

.chart-wrapper {
  background-color: var(--card-bg);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

/* ============================================
   Modal
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-overlay.hidden {
  display: none;
}

/* ============================================
   Grid System
   ============================================ */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ============================================
   Badge
   ============================================ */
.badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: var(--small-size);
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.badge-success {
  background-color: rgba(34, 197, 94, 0.1);
  color: #15803d;
}

.badge-error {
  background-color: rgba(239, 68, 68, 0.1);
  color: #dc2626;
}

.badge-warning {
  background-color: rgba(245, 158, 11, 0.1);
  color: #d97706;
}

.badge-info {
  background-color: rgba(79, 70, 229, 0.1);
  color: var(--primary);
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.hidden {
  display: none;
}

.flex {
  display: flex;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

/* ============================================
   반응형 디자인
   ============================================ */
@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
    top: 0;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  
  .container-with-sidebar {
    margin-left: 0;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .navbar-menu {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .table-container {
    font-size: var(--small-size);
  }
  
  .table th,
  .table td {
    padding: var(--spacing-sm);
  }
  
  h1 {
    font-size: 24px;
  }
  
  h2 {
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: var(--spacing-md);
  }
  
  .card {
    padding: var(--spacing-md);
  }
  
  .btn {
    width: 100%;
  }
}