/* 1. Variables and Themes */
:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #e2e8f0;
  --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --warning: #f59e0b;
  --success: #10b981;
  /* SEO specific colors to mimic search engines */
  --seo-link: #1a0dab;
  --seo-url: #202124;
  --seo-text: #4d5156;
}

body.dark {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --border: #334155;
  --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  --seo-link: #8ab4f8;
  --seo-url: #9aa0a6;
  --seo-text: #bdc1c6;
}

/* 2. Global Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s, color 0.3s;
  line-height: 1.5;
}

/* 3. Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border);
  padding: 2rem 1rem;
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  padding: 2rem;
  max-width: calc(100% - 260px);
}

/* 4. Sidebar Elements */
.logo {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 2rem;
  padding-left: 0.5rem;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

nav ul {
  list-style: none;
}

nav li {
  margin-bottom: 0.5rem;
}

nav a {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: all 0.2s;
}

nav a:hover,
nav a.active {
  background-color: var(--accent);
  color: white;
}

/* 5. Components & Cards */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.metric-card, .form-card, .table-wrapper, .seo-preview-card {
  background-color: var(--bg-secondary);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  transition: background-color 0.3s, box-shadow 0.3s;
  border: 1px solid var(--border);
}

.metric-card {
  border-left: 4px solid var(--accent);
}

.metric-card h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.metric-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* 6. Forms & Inputs */
.input-group {
  margin-bottom: 1.25rem;
}

.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

input, textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

input.error {
  border-color: var(--danger);
  background-color: rgba(239, 68, 68, 0.05);
}

/* 7. Buttons */
button {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.primary-btn {
  background-color: var(--accent);
  color: white;
  width: 100%;
}

.primary-btn:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

.secondary-btn {
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  margin-top: 1rem;
  width: 100%;
}

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

.tertiary-btn {
  background-color: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

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

.danger-btn, .delete-campaign {
  background-color: var(--danger);
  color: white;
}

.danger-btn:hover, .delete-campaign:hover {
  background-color: var(--danger-hover);
}

/* 8. Data Table */
.table-wrapper {
  overflow-x: auto;
  padding: 0;
}

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

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background-color: var(--bg-primary);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

td {
  font-size: 0.875rem;
}

/* 9. SEO Preview Tool */
.seo-preview-card {
  margin-top: 2rem;
}

.seo-snippet {
  margin-top: 1rem;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background-color: var(--bg-primary);
}

.snippet-title {
  font-size: 1.25rem;
  color: var(--seo-link);
  text-decoration: none;
  display: block;
  margin-bottom: 0.25rem;
  font-family: Arial, sans-serif; /* Mimic Google */
}

.snippet-url {
  font-size: 0.875rem;
  color: var(--seo-url);
  margin-bottom: 0.25rem;
  display: block;
  font-family: Arial, sans-serif;
}

.snippet-desc {
  font-size: 0.875rem;
  color: var(--seo-text);
  line-height: 1.5;
  font-family: Arial, sans-serif;
}

/* 10. Theme Toggle */
.theme-toggle {
  margin-top: auto;
  padding: 1rem 0;
}

#darkModeToggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 2rem;
  padding: 0.625rem 1rem;
  cursor: pointer;
  width: 100%;
  color: var(--text-primary);
  font-weight: 500;
  transition: all 0.2s;
}

#darkModeToggle:hover {
  background-color: var(--border);
}

/* 11. Uniform Professional Report Styles (Clean & Print-Ready) */
.professional-report {
  position: absolute;
  top: -9999px;
  left: -9999px;
  width: 210mm; /* A4 Width */
  min-height: 297mm;
  padding: 40px;
  background: #ffffff;
  color: #0f172a;
  font-family: 'Inter', sans-serif;
}

.report-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 3rem;
  border-bottom: 2px solid #3b82f6;
  padding-bottom: 1.5rem;
}

.report-header .logo-group .logo {
  font-size: 1.75rem;
  font-weight: 800;
  color: #3b82f6;
  margin-bottom: 0.25rem;
}

.report-header .report-info {
  text-align: right;
}

.report-header .report-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1e293b;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.report-header .report-date {
  color: #64748b;
  font-size: 0.875rem;
}

.report-section {
  margin-bottom: 2.5rem;
}

.report-section h3 {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #3b82f6;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.report-table td {
  padding: 1rem;
  border-bottom: 1px solid #e2e8f0;
  font-size: 1rem;
}

.report-table td:first-child {
  color: #64748b;
  font-weight: 500;
  width: 60%;
}

.report-table td:last-child {
  text-align: right;
  font-weight: 700;
  color: #0f172a;
}

.report-quality-badge {
  margin-top: 1.5rem;
  padding: 1rem;
  border-radius: 0.75rem;
  font-weight: 700;
  text-align: center;
  font-size: 1rem;
  border: 1px solid transparent;
}

.report-quality-badge.quality-good {
  background-color: #f0fdf4;
  color: #166534;
  border-color: #bbf7d0;
}

.report-quality-badge.quality-warning {
  background-color: #fefce8;
  color: #854d0e;
  border-color: #fef08a;
}

.report-quality-badge.quality-poor {
  background-color: #fef2f2;
  color: #991b1b;
  border-color: #fecaca;
}

.report-footer {
  position: absolute;
  bottom: 40px;
  left: 40px;
  right: 40px;
  text-align: center;
  font-size: 0.75rem;
  color: #94a3b8;
  border-top: 1px solid #e2e8f0;
  padding-top: 1.5rem;
}