:root {
  /* Brand palette */
  --primary: #0a164d;
  --primary-600: #0d1e6a;
  --secondary: #3f37c9;
  --accent: #f72585;
  --success: #4cc9f0;
  --light: #f8fbf4;
  --dark: #0b1028;
  --gray: #6c757d;
  --danger: #e63946;
  --warning: #fca311;
  --info: #8338ec;
  --border: #dee2e6;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow: 0 10px 30px rgba(10, 22, 77, 0.15);
  --shadow-soft: 0 6px 16px rgba(10,22,77,0.08);
  --transition: all 0.3s ease;
  --grad-primary: linear-gradient(135deg, #0a164d 0%, #3f37c9 45%, #4cc9f0 100%);
  --grad-accent: linear-gradient(135deg, #f72585 0%, #8338ec 100%);
}

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

body {
  font-family: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--light);
  color: var(--dark);
  line-height: 1.6;
}

html { scroll-behavior: smooth; }

/* skip-link removed */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 30px;
  padding: 24px 0;
  background: var(--light);
}

/* Nav */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.brand-logo { display: flex; align-items: center; gap: 10px; }
.brand-mark { background: var(--grad-primary); color: transparent; -webkit-background-clip: text; background-clip: text; font-size: 1.2rem; }
.brand-text { font-weight: 800; letter-spacing: 0.2px; background: var(--grad-primary); -webkit-background-clip: text; background-clip: text; color: transparent; }

.nav-right { display: flex; align-items: center; gap: 14px; }
.nav-link { color: var(--dark); text-decoration: none; font-weight: 600; opacity: 0.8; }
.nav-link:hover { opacity: 1; color: var(--primary); }

h1 {
  font-size: 2.6rem;
  margin-bottom: 10px;
  font-weight: 800;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  font-size: 1.2rem;
  color: var(--gray);
  margin-bottom: 20px;
}

.card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 28px;
  margin-bottom: 22px;
  border: 1px solid rgba(10,22,77,0.06);
}

.step {
  display: none;
}

.active {
  display: block !important;
}

.btn {
  background: var(--primary);
  color: #ffffff;
  border: none;
  padding: 12px 24px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.2px;
  transition: var(--transition);
  margin-right: 10px;
  margin-top: 10px;
  box-shadow: var(--shadow-soft);
}

.btn:hover {
  background: var(--primary-600);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  background: #5a6268;
}

.btn-success {
  background: linear-gradient(135deg, #00c2ff 0%, #0a7cff 50%, #7a5cff 100%);
}

.btn-success:hover {
  background: #3abfd8;
}

.btn-danger {
  background: var(--danger);
}

.btn-danger:hover {
  background: #c52c3a;
}

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

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--dark);
}

input[type="text"], input[type="url"], textarea, select {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: var(--transition);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(10, 22, 77, 0.2);
}

.auth-tab:focus,
.filter-btn:focus,
.share-btn:focus,
.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(10, 22, 77, 0.2);
}

.file-upload {
  border: 2px dashed var(--border);
  padding: 30px;
  text-align: center;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 20px;
}

.file-upload:hover {
  border-color: var(--primary);
  background: #f0f4ff;
}

.file-upload p {
  color: var(--gray);
  margin: 10px 0 0;
}

.data-preview {
  overflow-x: auto;
  margin: 20px 0;
}

/* Prevent metric selector overflow */
#metricSelector {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
#metricSelector label { white-space: nowrap; }

/* Ensure export controls wrap nicely */
#exportControls .share-links { flex-wrap: wrap; }

.data-preview table {
  min-width: 600px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

th, td {
  border: 1px solid var(--border);
  padding: 12px;
  text-align: left;
  font-size: 0.95rem;
}

th {
  background: #f8f9fa;
  font-weight: 600;
  color: var(--dark);
}

.chart-container {
  position: relative;
  height: 300px;
  margin: 30px 0;
}

.metrics-selection {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 15px;
  margin: 20px 0;
}

.metric-card {
  border: 1px solid var(--border);
  padding: 15px;
  border-radius: var(--radius);
  background: #f8f9fa;
  cursor: pointer;
  transition: var(--transition);
}

.metric-card:hover {
  border-color: var(--primary);
  background: #f0f4ff;
}

.metric-card.selected {
  border-color: var(--primary);
  background: #eef2ff;
  position: relative;
}

.metric-card.selected::after {
  content: '✓';
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--primary);
  color: white;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
}

.chart-suggestion {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.chart-option {
  border: 1px solid var(--border);
  padding: 15px;
  border-radius: var(--radius);
  text-align: center;
  cursor: pointer;
  background: white;
  transition: var(--transition);
  flex: 1;
  min-width: 120px;
}

.chart-option:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.chart-option.selected {
  border-color: var(--primary);
  background: linear-gradient(180deg, #eef2ff 0%, #f7f8ff 100%);
  font-weight: 600;
}

.filters {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.filter-btn {
  background: white;
  border: 1px solid var(--border);
  padding: 8px 15px;
  border-radius: 30px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--transition);
}

.filter-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.filters .filter-btn:last-child {
  border-color: var(--danger);
}

.insight-report {
  background: #f8f9fa;
  border-left: 4px solid var(--primary);
  padding: 20px;
  margin: 20px 0;
  border-radius: 0 10px 10px 0;
  font-style: italic;
  line-height: 1.8;
}

.validation-messages {
  margin-top: 10px;
}

.validation-messages .warning {
  background: #fff3cd;
  border-left: 4px solid #ffdd57;
  padding: 10px;
  border-radius: var(--radius);
  margin: 8px 0;
  color: #856404;
}

.dimension-selection,
.aggregation-controls {
  margin: 10px 0 20px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 12px;
}

.control-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  background: #fff;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.dashboard-item {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  height: 350px;
  overflow: hidden;
}

.dashboard-item h3 {
  margin-bottom: 15px;
  color: var(--primary);
  font-size: 1.2rem;
}

.summary-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  margin: 20px 0;
}

.stat-card {
  background: white;
  border-radius: var(--radius);
  padding: 15px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
  margin: 10px 0;
}

.stat-label {
  color: var(--gray);
  font-size: 0.9rem;
}

.navigation {
  display: flex;
  justify-content: space-between;
  margin: 30px 0;
}

.share-links {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.share-btn {
  background: white;
  border: 1px solid var(--border);
  padding: 10px 15px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  box-shadow: var(--shadow-soft);
}

.share-btn:hover {
  background: #f8f9fa;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

.loader {
  border: 4px solid #f3f3f3;
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  width: 30px;
  height: 30px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
  display: none;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Print styles */
@media print {
  .nav, header, .navigation, .filters, .share-links, footer { display: none !important; }
  .card { box-shadow: none !important; border: 1px solid #ccc; }
  .dashboard-item { page-break-inside: avoid; }
}

footer {
  text-align: center;
  margin-top: 50px;
  padding: 20px;
  color: var(--gray);
  font-size: 0.9rem;
}

/* Landing */
#landing {
  margin-bottom: 30px;
}

.landing-hero {
  text-align: left;
  background: radial-gradient(1200px 500px at 20% -10%, rgba(124, 109, 255, 0.25) 0%, rgba(124, 109, 255, 0) 60%),
              linear-gradient(180deg, #ffffff 0%, #f5f7ff 100%);
}

.glass {
  position: relative;
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(8px);
}

.blob { position: absolute; filter: blur(40px); opacity: 0.5; z-index: 0; }
.blob-a { width: 280px; height: 280px; background: #b9b4ff; top: -60px; left: -40px; border-radius: 50%; }
.blob-b { width: 300px; height: 300px; background: #9be7ff; bottom: -80px; right: -40px; border-radius: 50%; }

.landing-hero .hero-grid { position: relative; z-index: 1; }

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
  align-items: center;
}

.hero-copy { text-align: left; }
.hero-visual { display: flex; justify-content: center; }
.hero-screenshot { width: 100%; max-width: 480px; }
.skeleton { background: #eef1ff; border: 1px solid var(--border); border-radius: var(--radius-lg); }
.skeleton-chart { height: 180px; margin-bottom: 12px; }
.skeleton-table { height: 120px; }
.hero-svg { box-shadow: var(--shadow-soft); border-radius: var(--radius-lg); }

.landing-hero h2 {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.hero-sub {
  color: var(--gray);
  margin-bottom: 15px;
}

.hero-ctas {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 10px;
}

.hero-points {
  list-style: none;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 15px;
}

.hero-points li {
  background: #fff;
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 20px;
  font-size: 0.9rem;
}

.features h3 {
  margin-bottom: 10px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 15px;
  margin-top: 10px;
}

.feature {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 15px;
}

.feature-icon {
  font-size: 1.4rem;
  margin-bottom: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(63, 55, 201, 0.1);
  color: #3f37c9;
}

/* Trust */
.trust .trust-row { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.trust .trust-label { color: var(--gray); font-weight: 600; margin-right: 8px; }
.trust .logo { padding: 8px 12px; border: 1px dashed var(--border); border-radius: 10px; color: var(--primary); opacity: 0.8; }
.trust .logo:hover { opacity: 1; border-style: solid; }

.how-it-works h3 { margin-bottom: 10px; }
.steps { margin-left: 18px; color: var(--gray); }
.steps li { margin: 6px 0; }

/* Authentication Styles */
.auth-container {
  max-width: 400px;
  margin: 0 auto;
}

.auth-tabs {
  display: flex;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.auth-tab {
  background: none;
  border: none;
  padding: 15px 20px;
  cursor: pointer;
  font-size: 1rem;
  color: var(--gray);
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.auth-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.auth-tab:hover {
  color: var(--primary);
}

.auth-form {
  display: none;
}

.auth-form.active {
  display: block;
}

.demo-login {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.demo-login p {
  margin-bottom: 15px;
  color: var(--gray);
}

/* User Info Styles */
.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #f8f9fa;
  padding: 8px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
}

.user-avatar {
  font-size: 1.2rem;
}

.user-name {
  font-weight: 600;
  color: var(--primary);
  font-size: 0.9rem;
}

/* Creator Info in Reports */
.creator-info {
  background: #f0f4ff;
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  padding: 15px;
  margin: 20px 0;
  text-align: center;
}

.creator-info h4 {
  color: var(--primary);
  margin-bottom: 5px;
}

.creator-info p {
  color: var(--gray);
  font-size: 0.9rem;
  margin: 0;
}

/* View-only mode styles */
.view-only-mode {
  background: #fff3cd;
  border: 1px solid #ffeaa7;
  border-radius: var(--radius);
  padding: 15px;
  margin: 20px 0;
  text-align: center;
}

.view-only-mode h4 {
  color: #856404;
  margin-bottom: 5px;
}

.view-only-mode p {
  color: #856404;
  font-size: 0.9rem;
  margin: 0;
}

.error-message {
  background: #fee;
  color: var(--danger);
  padding: 10px;
  border-radius: var(--radius);
  margin: 10px 0;
  border-left: 4px solid var(--danger);
}

.success-message {
  background: #efe;
  color: var(--success);
  padding: 10px;
  border-radius: var(--radius);
  margin: 10px 0;
  border-left: 4px solid var(--success);
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { text-align: center; }
  .nav-right { display: none; }
  .summary-stats {
    grid-template-columns: 1fr;
  }
  .btn {
    width: 100%;
    margin-bottom: 10px;
  }
  .navigation {
    flex-direction: column;
  }
  .share-links {
    flex-direction: column;
  }
}

/* Tablet improvements */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { text-align: center; }
}

/* Mobile (<=640px) */
@media (max-width: 640px) {
  .container { padding: 16px; }
  .card { padding: 20px; }
  .landing-hero h2 { font-size: 1.5rem; }
  .hero-sub { font-size: 0.95rem; }
  .share-links { gap: 8px; }
  .dashboard-item { height: auto; }
  .chart-container { height: 240px; }
  .dashboard-grid { gap: 14px; }
}

/* Small Mobile (<=480px) */
@media (max-width: 480px) {
  h1 { font-size: 1.6rem; }
  .tagline { font-size: 1rem; }
  .hero-points { gap: 10px; }
  .hero-points li { font-size: 0.85rem; padding: 6px 10px; }
  .features-grid { grid-template-columns: 1fr; }
  .nav { margin-bottom: 0; }
}