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

:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --secondary: #64748b;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --sidebar-width: 220px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* 스크린 */
.screen {
  display: none;
  min-height: 100vh;
}
.screen.active {
  display: block;
}

/* 로그인 */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
#login-screen.active {
  display: flex;
}

.login-container {
  background: var(--card);
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
  text-align: center;
  width: 90%;
  max-width: 400px;
}

.login-container h1 {
  font-size: 24px;
  margin-bottom: 8px;
  color: var(--text);
}

.login-container p {
  color: var(--text-light);
  margin-bottom: 24px;
}

.login-container input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  margin-bottom: 16px;
  transition: border-color 0.2s;
}

.login-container input:focus {
  outline: none;
  border-color: var(--primary);
}

.login-container button {
  width: 100%;
  padding: 14px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.login-container button:hover {
  background: var(--primary-dark);
}

.error {
  color: var(--danger);
  margin-top: 12px;
  font-size: 14px;
}

/* 헤더 */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.menu-btn {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  display: none;
}

.menu-btn:hover {
  background: var(--bg);
}

header h1 {
  font-size: 18px;
  font-weight: 600;
}

.logout-btn {
  padding: 8px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
}

.logout-btn:hover {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

/* 사이드바 */
.sidebar {
  position: fixed;
  top: 60px;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--card);
  border-right: 1px solid var(--border);
  padding: 20px 0;
  overflow-y: auto;
  z-index: 90;
  transition: transform 0.3s;
}

.sidebar nav {
  display: flex;
  flex-direction: column;
}

.nav-item {
  padding: 12px 24px;
  color: var(--text-light);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background: var(--bg);
  color: var(--text);
}

.nav-item.active {
  background: #eff6ff;
  color: var(--primary);
  border-left-color: var(--primary);
}

/* 메인 컨텐츠 */
main {
  margin-left: var(--sidebar-width);
  margin-top: 60px;
  padding: 24px;
  min-height: calc(100vh - 60px);
}

.page {
  display: none;
}
.page.active {
  display: block;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.page-header h2 {
  font-size: 24px;
  font-weight: 600;
}

/* 버튼 */
.btn-primary {
  padding: 10px 20px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  padding: 10px 20px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

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

.btn-danger {
  padding: 6px 12px;
  background: var(--danger);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
}

.btn-small {
  padding: 6px 12px;
  font-size: 12px;
}

/* 검색바 & 필터 */
.search-bar, .filter-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.search-bar input, .filter-bar input, .filter-bar select {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--card);
}

.search-bar input {
  flex: 1;
  min-width: 200px;
}

.filter-bar select {
  min-width: 140px;
}

.filter-bar input[type="date"] {
  min-width: 140px;
}

/* 테이블 컨테이너 */
.table-container {
  background: var(--card);
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
}

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

.table-container th {
  background: var(--bg);
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-light);
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.table-container td {
  padding: 12px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
}

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

.table-container tr:hover td {
  background: var(--bg);
}

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

/* 통계 카드 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--card);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.stat-card h3 {
  font-size: 13px;
  color: var(--text-light);
  font-weight: 500;
  margin-bottom: 8px;
}

.stat-card p {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
}

.stat-card.wide {
  grid-column: span 2;
}

/* 차트 섹션 */
.chart-section, .recent-section {
  background: var(--card);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-bottom: 20px;
}

.chart-section h3, .recent-section h3 {
  font-size: 16px;
  margin-bottom: 16px;
}

.platform-bars {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.platform-bar {
  display: flex;
  align-items: center;
  gap: 12px;
}

.platform-bar .label {
  width: 80px;
  font-size: 14px;
  font-weight: 500;
}

.platform-bar .bar-container {
  flex: 1;
  height: 24px;
  background: var(--bg);
  border-radius: 12px;
  overflow: hidden;
}

.platform-bar .bar {
  height: 100%;
  border-radius: 12px;
  transition: width 0.5s ease;
}

.platform-bar .value {
  width: 100px;
  text-align: right;
  font-size: 14px;
  font-weight: 600;
}

.stats-charts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.chart-card {
  background: var(--card);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.chart-card h3 {
  font-size: 16px;
  margin-bottom: 16px;
}

.stats-detail {
  margin-bottom: 20px;
}

#stats-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
}

#stats-summary .summary-item {
  text-align: center;
  padding: 16px;
  background: var(--bg);
  border-radius: 8px;
}

#stats-summary .summary-item .label {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 4px;
}

#stats-summary .summary-item .value {
  font-size: 20px;
  font-weight: 700;
}

/* 모달 */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--card);
  border-radius: 16px;
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-content.wide {
  max-width: 700px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  font-size: 18px;
}

.close-btn {
  background: none;
  border: none;
  font-size: 28px;
  cursor: pointer;
  color: var(--text-light);
  line-height: 1;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 20px;
  border-top: 1px solid var(--border);
  margin-top: 20px;
}

/* 폼 */
form {
  padding: 20px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-light);
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
}

/* 설정 */
.settings-section {
  background: var(--card);
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-bottom: 20px;
}

.settings-section h3 {
  font-size: 16px;
  margin-bottom: 20px;
}

/* 파일 업로드 */
.upload-section {
  padding: 20px;
}

.file-upload {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 40px;
  text-align: center;
  margin-bottom: 20px;
  transition: border-color 0.2s;
}

.file-upload:hover {
  border-color: var(--primary);
}

.file-upload input[type="file"] {
  margin-bottom: 12px;
}

.file-upload p {
  color: var(--text-light);
  font-size: 14px;
}

.file-upload small {
  color: var(--text-light);
  font-size: 12px;
}

.upload-preview {
  max-height: 200px;
  overflow-y: auto;
  font-size: 12px;
  background: var(--bg);
  border-radius: 8px;
  padding: 12px;
}

/* 발주서 품목 */
#order-items {
  margin-bottom: 16px;
}

.order-item {
  display: grid;
  grid-template-columns: 1fr 2fr 80px 100px auto;
  gap: 8px;
  margin-bottom: 8px;
}

.order-item input {
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
}

/* 토스트 */
.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text);
  color: white;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 300;
  transition: transform 0.3s;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

.toast.success {
  background: var(--success);
}

.toast.error {
  background: var(--danger);
}

/* 상태 배지 */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.badge-success {
  background: #dcfce7;
  color: #166534;
}

.badge-warning {
  background: #fef3c7;
  color: #92400e;
}

.badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

.badge-info {
  background: #dbeafe;
  color: #1e40af;
}

/* 빈 상태 */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}

.empty-state p {
  font-size: 16px;
  margin-bottom: 8px;
}

/* 로딩 */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-light);
}

/* 반응형 */
@media (max-width: 768px) {
  .menu-btn {
    display: block;
  }

  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  main {
    margin-left: 0;
  }

  .page-header {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-bar {
    flex-direction: column;
  }

  .filter-bar select,
  .filter-bar input {
    width: 100%;
  }

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

  .stat-card.wide {
    grid-column: span 2;
  }

  .modal-content {
    margin: 10px;
    max-height: calc(100vh - 20px);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .order-item {
    grid-template-columns: 1fr 1fr;
  }

  .table-container {
    font-size: 13px;
  }

  .table-container th,
  .table-container td {
    padding: 8px 12px;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stat-card.wide {
    grid-column: span 1;
  }

  header h1 {
    font-size: 16px;
  }

  .login-container {
    padding: 30px 20px;
  }
}