/* ====================================================================
   Logflow — Design System & Core Styles
   Modern, Data-focused, Professional, Responsive Dark/Light System
   ==================================================================== */

:root {
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  
  /* Color Palette - Slate / Indigo / Electric Emerald */
  --bg-main: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --bg-input-hover: #475569;
  
  --border-color: #334155;
  --border-focus: #3b82f6;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: rgba(59, 130, 246, 0.15);

  --success: #10b981;
  --success-light: rgba(16, 185, 129, 0.15);
  
  --warning: #f59e0b;
  --warning-light: rgba(245, 158, 11, 0.15);

  --danger: #ef4444;
  --danger-light: rgba(239, 68, 68, 0.15);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.25);
  
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Override */
[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-input: #f1f5f9;
  --bg-input-hover: #e2e8f0;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}
a:hover {
  color: var(--primary-hover);
}

/* Base Layout Structure */
.app-container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background-color: var(--bg-card);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1rem;
  flex-shrink: 0;
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow-x: hidden;
}

.topbar {
  height: 64px;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
}

.page-body {
  padding: 2rem 1.5rem;
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

/* Brand Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Navigation Links */
.nav-menu {
  list-style: none;
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
}

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

.nav-link.active {
  background-color: var(--primary);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Cards & Panels */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

/* Page Header & Actions */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.925rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

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

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

.btn-danger {
  background-color: var(--danger);
  color: #ffffff;
}
.btn-danger:hover {
  background-color: #dc2626;
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
}

/* Form Controls */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.form-label .required-star {
  color: var(--danger);
  margin-left: 2px;
}

.form-control {
  width: 100%;
  padding: 0.65rem 0.9rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

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

.form-help {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

.input-group {
  display: flex;
  align-items: center;
}

.input-unit {
  padding: 0.65rem 0.9rem;
  background-color: var(--border-color);
  border: 1px solid var(--border-color);
  border-left: none;
  border-top-right-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
}

.input-group .form-control {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

/* Data Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.data-table th {
  background-color: var(--bg-card);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  background-color: var(--bg-card);
}

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

.data-table tr:hover td {
  background-color: var(--bg-input);
}

/* Badges & Status */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.775rem;
  font-weight: 600;
  text-transform: capitalize;
}

.badge-active, .badge-success {
  background-color: var(--success-light);
  color: var(--success);
}

.badge-pending, .badge-warning {
  background-color: var(--warning-light);
  color: var(--warning);
}

.badge-blocked, .badge-danger, .badge-deleted {
  background-color: var(--danger-light);
  color: var(--danger);
}

/* Alerts & Flash Messages */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  font-size: 0.925rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.alert-success {
  background-color: var(--success-light);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.alert-danger {
  background-color: var(--danger-light);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.alert-warning {
  background-color: var(--warning-light);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3.5rem 1.5rem;
}

.empty-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.25rem;
  background-color: var(--primary-light);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.empty-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.empty-text {
  color: var(--text-secondary);
  max-width: 420px;
  margin: 0 auto 1.5rem;
  font-size: 0.95rem;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.stat-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-val {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 0.35rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .app-container {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .page-body {
    padding: 1.25rem 1rem;
  }
}