/* ============================================================
   AI Cost Attribution Platform — Design System & Styles
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #EFF6FF;
  --secondary: #059669;
  --secondary-light: #ECFDF5;
  --accent: #7C3AED;
  --accent-light: #F5F3FF;
  --warning: #D97706;
  --warning-light: #FFFBEB;
  --danger: #DC2626;
  --danger-light: #FEF2F2;
  --bg: #F8FAFC;
  --bg-alt: #EEF2F7;
  --surface: #FFFFFF;
  --text: #0F172A;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  --border: #E2E8F0;
  --border-light: #F1F5F9;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.06);
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --transition: 150ms ease;
  --max-width: 1200px;
  --nav-height: 64px;
  --sidebar-width: 240px;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--primary); color: white; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: 48px; font-weight: 800; }
h2 { font-size: 36px; }
h3 { font-size: 24px; }
h4 { font-size: 18px; }

.mono { font-family: 'JetBrains Mono', monospace; font-size: 13px; }

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 80px 0; }
.section-sm { padding: 48px 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover { text-decoration: none; }

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

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn-ghost:hover { background: var(--bg-alt); color: var(--text); }

.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 16px 32px; font-size: 17px; }

.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #B91C1C; }

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.navbar.scrolled { box-shadow: var(--shadow-md); }

.navbar .container {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 32px;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.navbar-logo:hover { text-decoration: none; color: var(--text); }

.navbar-links {
  display: flex;
  list-style: none;
  gap: 4px;
  flex: 1;
}

.navbar-links a {
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.navbar-links a:hover { background: var(--bg-alt); color: var(--text); text-decoration: none; }

.navbar-cta { display: flex; align-items: center; gap: 12px; }

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--text);
}

/* Mobile Nav */
.mobile-nav { display: none; }

/* ---------- Hero ---------- */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg) 100%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: white;
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero-badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--secondary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero h1 { margin-bottom: 20px; max-width: 700px; }

.hero-sub {
  font-size: 19px;
  color: var(--text-secondary);
  max-width: 580px;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.hero-stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
}

.hero-stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ---------- Dashboard Layout ---------- */
.dashboard-layout {
  display: flex;
  padding-top: var(--nav-height);
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--surface);
  border-right: 1px solid var(--border);
  position: fixed;
  top: var(--nav-height);
  left: 0;
  bottom: 0;
  overflow-y: auto;
  padding: 20px 0;
  flex-shrink: 0;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 20px 20px;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 12px;
}

.sidebar-logo-text {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.sidebar-section { margin-bottom: 8px; }

.sidebar-section-label {
  padding: 8px 20px 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.sidebar-nav a,
.sidebar-nav button {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition);
  border-left: 3px solid transparent;
}

.sidebar-nav a:hover,
.sidebar-nav button:hover {
  background: var(--bg-alt);
  color: var(--text);
  text-decoration: none;
}

.sidebar-nav a.active,
.sidebar-nav button.active {
  color: var(--primary);
  background: var(--primary-light);
  border-left-color: var(--primary);
  font-weight: 600;
}

.sidebar-nav svg { width: 18px; height: 18px; flex-shrink: 0; }

.sidebar-plan-badge {
  margin: 16px 20px 0;
  background: var(--primary-light);
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  text-align: center;
}

/* ---------- Main Content ---------- */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 32px;
  min-width: 0;
}

.page-header { margin-bottom: 32px; }
.page-header h1 { font-size: 24px; margin-bottom: 4px; }
.page-header p { color: var(--text-secondary); font-size: 15px; }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

/* ---------- Stat Cards ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

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

.stat-card-value {
  font-size: 32px;
  font-weight: 800;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text);
  line-height: 1;
}

.stat-card-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

.stat-card-value.success { color: var(--secondary); }
.stat-card-value.warning { color: var(--warning); }
.stat-card-value.danger { color: var(--danger); }

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

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  font-size: 14px;
}

thead th {
  text-align: left;
  padding: 12px 16px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

tbody tr { border-bottom: 1px solid var(--border-light); transition: background var(--transition); }
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: var(--bg-alt); }

tbody td { padding: 14px 16px; color: var(--text); vertical-align: middle; }

.table-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
}
.table-badge.openai { background: #F0FDF4; color: #16A34A; }
.table-badge.anthropic { background: #F5F3FF; color: #7C3AED; }
.table-badge.google { background: #FEF9C3; color: #CA8A04; }
.table-badge.active { background: var(--secondary-light); color: var(--secondary); }
.table-badge.warning { background: var(--warning-light); color: var(--warning); }
.table-badge.danger { background: var(--danger-light); color: var(--danger); }

/* ---------- Charts ---------- */
.chart-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.chart-container h3 { font-size: 15px; margin-bottom: 16px; }

/* ---------- Forms ---------- */
.form-group { margin-bottom: 20px; }

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

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
  transition: border-color var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.form-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.form-error {
  font-size: 12px;
  color: var(--danger);
  margin-top: 4px;
}

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-overlay.open { opacity: 1; pointer-events: all; }

.modal {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: 32px;
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform var(--transition);
}

.modal-overlay.open .modal { transform: translateY(0); }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-title { font-size: 20px; }

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.modal-close:hover { background: var(--bg-alt); color: var(--text); }

.modal-footer {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 24px;
}

/* ---------- Alerts / Toasts ---------- */
.alert-banner {
  padding: 12px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  border: 1px solid;
}
.alert-banner.success { background: var(--secondary-light); border-color: var(--secondary); color: var(--secondary); }
.alert-banner.warning { background: var(--warning-light); border-color: var(--warning); color: var(--warning); }
.alert-banner.danger { background: var(--danger-light); border-color: var(--danger); color: var(--danger); }
.alert-banner.info { background: var(--primary-light); border-color: var(--primary); color: var(--primary); }

/* ---------- Empty State ---------- */
.empty-state {
  text-align: center;
  padding: 64px 32px;
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  background: var(--bg-alt);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: var(--text-muted);
}

.empty-state h3 { font-size: 18px; margin-bottom: 8px; }
.empty-state p { color: var(--text-secondary); font-size: 15px; margin-bottom: 24px; max-width: 400px; margin-left: auto; margin-right: auto; }

/* ---------- Pricing Cards ---------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.pricing-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px;
  transition: all var(--transition);
}

.pricing-card.featured {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  position: relative;
}

.pricing-card.featured::before {
  content: 'Most Popular';
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: white;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 16px;
  border-radius: 100px;
}

.pricing-tier { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.pricing-price { font-size: 48px; font-weight: 800; color: var(--text); font-family: 'JetBrains Mono', monospace; }
.pricing-price span { font-size: 16px; font-weight: 500; color: var(--text-secondary); }
.pricing-desc { color: var(--text-secondary); font-size: 14px; margin: 8px 0 24px; }

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text);
}

.pricing-features li svg { width: 16px; height: 16px; color: var(--secondary); flex-shrink: 0; }

/* ---------- Sections ---------- */
.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-header { text-align: center; max-width: 600px; margin: 0 auto 56px; }
.section-header h2 { margin-bottom: 16px; }
.section-header p { font-size: 18px; color: var(--text-secondary); }

/* ---------- How It Works ---------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

.step-card {
  text-align: center;
  padding: 32px 24px;
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  font-size: 18px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.step-card h3 { margin-bottom: 10px; font-size: 18px; }
.step-card p { color: var(--text-secondary); font-size: 15px; }

/* ---------- Social Proof ---------- */
.logos-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  opacity: 0.6;
}

.logos-row span {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', monospace;
}

/* ---------- Testimonials ---------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.testimonial-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.testimonial-card blockquote {
  font-size: 15px;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-author { display: flex; align-items: center; gap: 12px; }

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  color: var(--primary);
}

.testimonial-name { font-size: 14px; font-weight: 600; }
.testimonial-role { font-size: 12px; color: var(--text-muted); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 680px; margin: 0 auto; }

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item:last-child { border-bottom: none; }

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 20px 0;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: inherit;
  transition: color var(--transition);
}

.faq-question:hover { color: var(--primary); }

.faq-answer {
  padding-bottom: 20px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  display: none;
}

.faq-answer.open { display: block; }

.faq-question svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-question.open svg { transform: rotate(180deg); }

/* ---------- CTA Section ---------- */
.cta-section {
  background: var(--primary);
  color: white;
  padding: 80px 0;
  text-align: center;
}

.cta-section h2 { color: white; margin-bottom: 16px; }
.cta-section p { font-size: 18px; opacity: 0.85; margin-bottom: 36px; max-width: 500px; margin-left: auto; margin-right: auto; }
.cta-section .btn-primary { background: white; color: var(--primary); }
.cta-section .btn-primary:hover { background: var(--bg); }

/* ---------- Dashboard Preview ---------- */
.dashboard-preview {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-top: 56px;
}

.dashboard-preview-bar {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.dashboard-preview-dots { display: flex; gap: 6px; }
.dashboard-preview-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dashboard-preview-dot.red { background: #FF5F57; }
.dashboard-preview-dot.yellow { background: #FEBC2E; }
.dashboard-preview-dot.green { background: #28C840; }

.dashboard-preview-url {
  flex: 1;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
  font-size: 12px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  text-align: center;
}

/* ---------- Provider logos ---------- */
.provider-logo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
}

/* ---------- Loading ---------- */
.loading { display: flex; align-items: center; justify-content: center; padding: 48px; color: var(--text-muted); }
.spinner { width: 24px; height: 24px; border: 2px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.6s linear infinite; margin-right: 12px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Footer ---------- */
.footer {
  background: var(--text);
  color: var(--text-muted);
  padding: 48px 0;
  font-size: 14px;
}

.footer .container { display: flex; justify-content: space-between; align-items: center; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: white; text-decoration: none; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .navbar-links { display: none; }
  .mobile-menu-btn { display: flex; }
  .navbar-cta .btn:not(.mobile-menu-btn) { display: none; }

  .mobile-nav {
    display: flex !important;
    flex-direction: column;
  }

  h1 { font-size: 32px; }
  .hero { padding: 120px 0 60px; }
  .hero-stats { flex-direction: column; gap: 24px; }

  .sidebar {
    display: none;
  }
  .main-content {
    margin-left: 0;
    padding: 24px 16px;
  }

  .dashboard-layout.sidebar-open .sidebar {
    display: flex;
    z-index: 1001;
    box-shadow: var(--shadow-lg);
  }

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

  .footer .container { flex-direction: column; gap: 16px; text-align: center; }
}

/* ---------- Dashboard Tabs ---------- */
.dashboard-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.dashboard-tab {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: -1px;
}

.dashboard-tab:hover { color: var(--text); }

.dashboard-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ---------- Grid layouts ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

@media (max-width: 900px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Wireframe / Skeleton ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--bg-alt) 25%, var(--border-light) 50%, var(--bg-alt) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}