:root {
  --bg-main: #f8fafc;
  --panel-bg: #ffffff;
  --panel-border: #e2e8f0;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --brand-blue: #0081c6;
  --brand-blue-hover: #006bb0;
  --brand-cyan: #009fe3;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --gray-bg: #f1f5f9;
  --radius-lg: 12px;
  --radius-md: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 20px -2px rgba(0,0,0,0.06);
}

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

body {
  font-family: 'Inter', -apple-system, system-ui, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
}

.hidden {
  display: none !important;
}

/* Auth View */
.auth-view {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-main);
  padding: 20px;
}

.auth-card {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  width: 100%;
  max-width: 420px;
  padding: 36px 30px;
  text-align: center;
}

.auth-logo {
  height: 48px;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-brand-logo {
  height: 100%;
  width: auto;
}

.auth-card h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
}

.auth-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.auth-form {
  text-align: left;
}

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

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-main);
}

.form-group input, .select-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-md);
  font-size: 14px;
  outline: none;
  background: #ffffff;
}

.select-wide {
  min-width: 220px;
}

.select-sm {
  width: auto;
  padding: 6px 12px;
  font-size: 13px;
}

.form-group input:focus, .select-input:focus {
  border-color: var(--brand-blue);
}

.auth-switch-link {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}

.auth-switch-link a {
  color: var(--brand-blue);
  font-weight: 600;
  text-decoration: none;
}

.auth-switch-link a:hover {
  text-decoration: underline;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--brand-blue);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--brand-blue-hover);
}

.btn-secondary {
  background-color: #e2e8f0;
  color: var(--text-main);
}

.btn-secondary:hover {
  background-color: #cbd5e1;
}

.btn-success {
  background-color: var(--success);
  color: #ffffff;
  padding: 10px 20px;
  font-size: 14px;
}

.btn-success:hover {
  background-color: #059669;
}

.btn-danger {
  background-color: var(--danger);
  color: #ffffff;
  padding: 8px 16px;
}

.btn-danger:hover {
  background-color: #dc2626;
}

.btn-block {
  width: 100%;
  padding: 12px;
  font-size: 15px;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 12px;
}

.auth-error {
  margin-top: 14px;
  color: var(--danger);
  font-size: 13px;
}

/* App Header */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-header {
  background: var(--panel-bg);
  border-bottom: 1px solid var(--panel-border);
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

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

.logo-wrapper {
  height: 36px;
}

.brand-logo {
  height: 100%;
  width: auto;
}

.brand-divider {
  width: 1px;
  height: 24px;
  background-color: var(--panel-border);
}

.brand-text h1 {
  font-family: 'Outfit', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.brand-text .sub-text {
  font-size: 12px;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-tabs {
  display: flex;
  gap: 8px;
  background: var(--gray-bg);
  padding: 4px;
  border-radius: var(--radius-md);
}

.nav-tab {
  border: none;
  background: transparent;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-tab.active {
  background: #ffffff;
  color: var(--brand-blue);
  box-shadow: var(--shadow-sm);
}

/* Admin Sub Navigation Tabs */
.admin-sub-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  border-bottom: 2px solid var(--panel-border);
  padding-bottom: 4px;
  flex-wrap: wrap;
}

.admin-sub-tab {
  border: none;
  background: transparent;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.admin-sub-tab:hover {
  background: var(--gray-bg);
  color: var(--text-main);
}

.admin-sub-tab.active {
  background: var(--brand-blue);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

/* Connection Badge */
.status-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
}

.status-connecting {
  background-color: #fef3c7;
  color: #d97706;
}

.status-connected {
  background-color: #d1fae5;
  color: #047857;
}

.status-disconnected {
  background-color: #fee2e2;
  color: #b91c1c;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 12px;
}

.role-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  background: #e2e8f0;
  color: #475569;
}

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

/* Main Content */
.main-content {
  flex: 1;
  padding: 24px 28px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

/* Site Selector Bar */
.site-bar {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 32px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  flex-wrap: nowrap;
}

.site-selector-group, .device-selector-group {
  display: flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
}

.site-selector-group label, .device-selector-group label {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.section-title h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  word-break: keep-all;
}

.live-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--success);
}

.margin-top-lg {
  margin-top: 32px;
}

.margin-top-md {
  margin-top: 18px;
}

.margin-top-xs {
  margin-top: 6px;
}

.margin-left-sm {
  margin-left: 10px;
}

/* Monitoring Tag Cards Grid */
.tag-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.tag-card {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s, box-shadow 0.2s;
}

.tag-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.tag-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.tag-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
}

.tag-card-value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 10px 0;
}

.tag-card-value .value {
  font-family: 'Outfit', sans-serif;
  font-size: 32px;
  font-weight: 700;
  color: var(--brand-blue);
}

.tag-card-value .unit {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
}

/* Control Cards Grid */
.control-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.control-card {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.control-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.control-card-header h4 {
  font-size: 16px;
  font-weight: 700;
}

.text-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.input-control-group {
  display: flex;
  gap: 10px;
  align-items: center;
}

.input-control-group input {
  flex: 1;
}

.input-control-group .btn {
  min-width: 85px;
  padding: 10px 18px;
  font-size: 14px;
  white-space: nowrap;
}

/* Chart Controls Header */
.chart-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.interval-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

/* Trend Chart Card */
.chart-card-wrapper {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  margin-top: 12px;
  height: 380px;
}

/* Admin Grid */
.admin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.admin-card {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.admin-card-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--panel-border);
  background: #fafafa;
  border-top-left-radius: var(--radius-lg);
  border-top-right-radius: var(--radius-lg);
}

.admin-card-header h3 {
  font-size: 16px;
  font-weight: 700;
}

.admin-card-body {
  padding: 24px;
}

.table-sub-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--brand-blue);
  margin-bottom: 12px;
}

.form-row {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
  align-items: center;
}

.flex-1 { flex: 1; }
.flex-2 { flex: 2; }

.divider {
  border: none;
  border-top: 1px solid var(--panel-border);
  margin: 20px 0;
}

/* Tag Config Table */
.table-wrapper {
  overflow-x: auto;
  margin-bottom: 16px;
}

.tag-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.tag-table th, .tag-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--panel-border);
  text-align: left;
  white-space: nowrap;
}

.tag-table th {
  background: var(--gray-bg);
  font-weight: 600;
}

.tag-table input {
  padding: 6px 10px;
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  font-size: 13px;
}

.tag-table input.num-input {
  width: 70px;
}

.tag-table input.addr-input {
  width: 110px;
}

.tag-table select.type-select {
  padding: 6px;
  font-size: 12px;
  border-radius: 4px;
  border: 1px solid var(--panel-border);
}

/* 💡 현장이 수십개 늘어나도 안 길어지는 콤팩트 내장 스크롤 박스 */
.site-scroll-box {
  max-height: 110px;
  overflow-y: auto;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 8px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.site-checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.site-checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  cursor: pointer;
  background: var(--gray-bg);
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
}

.action-bar-bottom {
  margin-top: 20px;
}

/* Toggle Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 38px;
  height: 22px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: #cbd5e1;
  transition: .3s;
  border-radius: 22px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--brand-blue);
}

input:checked + .slider:before {
  transform: translateX(16px);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #1e293b;
  color: #ffffff;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-md);
  z-index: 9999;
  transition: opacity 0.3s ease;
}

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

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

/* 📱 모바일 및 스마트폰 전용 반응형 최적화 */
@media (max-width: 768px) {
  .app-header {
    padding: 12px 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .brand {
    justify-content: space-between;
  }

  .header-actions {
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 10px;
  }

  .nav-tabs {
    flex: 1;
    justify-content: center;
  }

  .admin-sub-tabs {
    flex-direction: column;
    gap: 6px;
  }

  .admin-sub-tab {
    width: 100%;
    text-align: left;
  }

  .main-content {
    padding: 16px;
  }

  .site-bar {
    flex-direction: column;
    gap: 12px;
    align-items: stretch;
    padding: 14px 16px;
  }

  .site-selector-group, .device-selector-group {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .select-wide {
    width: 100%;
    min-width: unset;
  }

  .section-title.flex-between {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .section-title h3 {
    font-size: 15px;
    line-height: 1.4;
    word-break: keep-all;
  }

  .chart-controls {
    width: 100%;
    justify-content: space-between;
    margin-left: 0;
  }

  .margin-left-sm {
    margin-left: 0;
  }

  .tag-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .control-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .chart-card-wrapper {
    padding: 14px;
    height: 320px;
  }

  .admin-card-body {
    padding: 16px;
  }

  .form-row {
    flex-direction: column;
    align-items: stretch;
  }
}