/* ============================================================
   Quick Fact Checker — Main Stylesheet
   Modern, responsive, dark/light theme support
   ============================================================ */

/* ==============================
   CSS CUSTOM PROPERTIES
   ============================== */
:root {
  --primary:        #4f46e5;
  --primary-hover:  #4338ca;
  --primary-light:  #6366f1;
  --secondary:      #7c3aed;
  --accent:         #06b6d4;

  --bg:             linear-gradient(135deg, #dbeafe 0%, #e0e7ff 50%, #f3e8ff 100%);
  --card-bg:        rgba(255, 255, 255, 0.85);
  --card-border:    rgba(255, 255, 255, 0.4);

  --text-primary:   #1f2937;
  --text-secondary: #6b7280;
  --text-muted:     #9ca3af;

  --success:        #059669;
  --success-light:  #10b981;
  --success-bg:     #ecfdf5;
  --success-border: rgba(5, 150, 105, 0.3);

  --error:          #dc2626;
  --error-light:    #ef4444;
  --error-bg:       #fef2f2;
  --error-border:   rgba(220, 38, 38, 0.3);

  --warning:        #d97706;
  --warning-bg:     #fef3c7;
  --warning-border: rgba(217, 119, 6, 0.3);

  --border:         #e5e7eb;
  --shadow:         0 20px 25px -5px rgba(0,0,0,.10), 0 10px 10px -5px rgba(0,0,0,.04);
  --shadow-sm:      0 4px 12px rgba(0,0,0,.08);
  --radius:         1rem;
  --radius-sm:      0.5rem;
  --radius-lg:      1.5rem;

  --navbar-h:       70px;
  --transition:     0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark theme overrides */
body.dark {
  --bg:             linear-gradient(135deg, #111827 0%, #1f2937 50%, #312e81 100%);
  --card-bg:        rgba(31, 41, 55, 0.85);
  --card-border:    rgba(255, 255, 255, 0.08);
  --text-primary:   #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted:     #6b7280;
  --border:         #374151;
  --shadow:         0 20px 25px -5px rgba(0,0,0,.4), 0 10px 10px -5px rgba(0,0,0,.2);
  --success-bg:     rgba(5, 150, 105, 0.12);
  --error-bg:       rgba(220, 38, 38, 0.12);
  --warning-bg:     rgba(217, 119, 6, 0.12);
}

/* ==============================
   RESET & BASE
   ============================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
               Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text-primary);
  transition: background var(--transition), color var(--transition);
}

img { max-width: 100%; display: block; }
a { color: inherit; }
button { font-family: inherit; }

/* ==============================
   ACCESSIBILITY
   ============================== */
.skip-to-content {
  position: absolute;
  left: -999px;
  top: -999px;
  background: #111827;
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 9999;
  border-radius: 4px;
  font-weight: 600;
  text-decoration: none;
}
.skip-to-content:focus {
  left: 1rem;
  top: 1rem;
  outline: 3px solid #ffbf47;
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute !important;
  height: 1px; width: 1px;
  overflow: hidden;
  clip: rect(1px,1px,1px,1px);
  white-space: nowrap;
  border: 0; padding: 0; margin: -1px;
}

button:focus-visible,
a:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==============================
   NAVBAR
   ============================== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--navbar-h);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.08);
  z-index: 1000;
  transition: background var(--transition), border-color var(--transition);
}
body.dark .navbar {
  background: rgba(17,24,39,0.95);
  border-bottom-color: rgba(255,255,255,0.08);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition);
}
.nav-logo:hover { transform: translateY(-1px); background: rgba(79,70,229,0.06); }

.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  flex-shrink: 0;
}

.logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}

/* Nav links */
.nav-center { display: flex; align-items: center; }

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
}

.nav-link {
  display: block;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover {
  color: var(--primary);
  background: rgba(79,70,229,0.06);
}

/* Nav right controls */
.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text-primary);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  flex-shrink: 0;
}
.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-sm);
  background: rgba(79,70,229,0.08);
}

.theme-icon { width: 18px; height: 18px; stroke: currentColor; fill: none; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1rem;
  border-radius: 2rem;
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  font-family: inherit;
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 12px rgba(79,70,229,0.3);
  white-space: nowrap;
}
.btn-secondary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(79,70,229,0.4);
}

.user-menu {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
}
.user-menu img { border-radius: 50%; object-fit: cover; }

.btn-link {
  background: none;
  border: none;
  color: var(--error);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.btn-link:hover { background: var(--error-bg); }

/* Hamburger */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
}
.mobile-menu-btn span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* Mobile dropdown */
.mobile-menu {
  display: none;
  background: rgba(255,255,255,0.98);
  border-top: 1px solid var(--border);
  padding: 1rem 1.5rem 1.5rem;
}
body.dark .mobile-menu {
  background: rgba(17,24,39,0.98);
  border-top-color: rgba(255,255,255,0.08);
}
.mobile-menu.show { display: block; }

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.mobile-nav-link {
  display: block;
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 500;
  color: var(--text-primary);
  transition: background var(--transition), color var(--transition);
}
.mobile-nav-link:hover { background: rgba(79,70,229,0.06); color: var(--primary); }

.mobile-login-btn {
  margin-top: 0.5rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary)) !important;
  color: #fff !important;
  border-radius: 2rem !important;
  text-align: center;
}

/* ==============================
   LAYOUT & CONTAINER
   ============================== */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: calc(var(--navbar-h) + 2rem) 1.5rem 3rem;
}

main { min-height: calc(100vh - var(--navbar-h)); }

/* ==============================
   HERO HEADER
   ============================== */
.hero-header {
  text-align: center;
  margin-bottom: 2.5rem;
  padding: 1rem 0;
}

.hero-title {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ==============================
   CARDS (shared)
   ============================== */
.main-card,
.history-card,
.dashboard-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 2rem;
  margin-bottom: 1.5rem;
  transition: box-shadow var(--transition);
}

/* ==============================
   SAMPLE INPUTS
   ============================== */
.sample-inputs { margin-bottom: 1.5rem; }

.sample-inputs p {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sample-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.sample-btn {
  background: rgba(79,70,229,0.08);
  color: var(--primary);
  border: 1px solid rgba(79,70,229,0.2);
  padding: 0.45rem 1rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.sample-btn:hover {
  background: rgba(79,70,229,0.15);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.sample-btn:active { transform: scale(0.97); }

/* ==============================
   FORM
   ============================== */
.form-group { margin-bottom: 1.5rem; }

label {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.textarea-container { position: relative; }

textarea {
  width: 100%;
  min-height: 140px;
  max-height: 400px;
  padding: 1rem 1rem 2.5rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  resize: vertical;
  font-size: 1rem;
  font-family: inherit;
  line-height: 1.6;
  background: rgba(255,255,255,0.6);
  color: var(--text-primary);
  transition: border-color var(--transition), box-shadow var(--transition);
}
body.dark textarea {
  background: rgba(31,41,55,0.6);
  border-color: var(--border);
}
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(79,70,229,0.12);
}
textarea::placeholder { color: var(--text-muted); }

.char-count {
  position: absolute;
  bottom: 0.6rem;
  right: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--card-bg);
  padding: 0.2rem 0.5rem;
  border-radius: 0.4rem;
  backdrop-filter: blur(8px);
}

.clear-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.8rem;
  padding: 0;
  line-height: 1;
  transition: color var(--transition);
}
.clear-btn:hover { color: var(--error); }

/* ==============================
   PRIMARY BUTTON
   ============================== */
.btn-primary {
  width: 100%;
  padding: 0.9rem 1.5rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  box-shadow: 0 8px 20px -4px rgba(79,70,229,0.35);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px -6px rgba(79,70,229,0.45);
}
.btn-primary:active:not(:disabled) { transform: scale(0.98); }
.btn-primary:disabled {
  background: linear-gradient(135deg, #9ca3af, #6b7280);
  cursor: not-allowed;
  box-shadow: none;
}

.btn-content {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* Loading spinner inside button */
.loading-spinner {
  display: none;
  width: 20px; height: 20px;
  border: 3px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ==============================
   PREDICTION RESULT
   ============================== */
.prediction-result {
  display: none;
  align-items: flex-start;
  gap: 1rem;
  margin-top: 1.5rem;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease;
  scroll-margin-top: 1rem;
}
.prediction-result.show {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

/* State variants */
.prediction-result.success {
  background: var(--success-bg);
  color: var(--success);
  border-color: var(--success-border);
}
body.dark .prediction-result.success { color: var(--success-light); }

.prediction-result.error {
  background: var(--error-bg);
  color: var(--error);
  border-color: var(--error-border);
}
body.dark .prediction-result.error { color: var(--error-light); }

.prediction-result.warning {
  background: var(--warning-bg);
  color: var(--warning);
  border-color: var(--warning-border);
}

.prediction-result.loading {
  background: rgba(79,70,229,0.06);
  color: var(--primary);
  border-color: rgba(79,70,229,0.2);
}

/* Result icon */
.result-icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.3);
}
.prediction-result.loading .result-icon { animation: pulse 1.5s ease-in-out infinite; }
@keyframes pulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.08); } }

.result-content { flex: 1; min-width: 0; }

.result-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

#result-message {
  font-size: 0.95rem;
  line-height: 1.6;
  word-break: break-word;
}

/* Confidence bar */
.confidence-bar {
  width: 100%;
  height: 8px;
  background: rgba(0,0,0,0.1);
  border-radius: 4px;
  overflow: hidden;
  margin: 0.75rem 0 0.4rem;
}
.confidence-fill {
  height: 100%;
  width: 0%;
  border-radius: 4px;
  transition: width 0.8s cubic-bezier(0.4,0,0.2,1);
}
.prediction-result.success .confidence-fill {
  background: linear-gradient(90deg, var(--success), var(--success-light));
}
.prediction-result.error .confidence-fill {
  background: linear-gradient(90deg, var(--error), var(--error-light));
}
.prediction-result.warning .confidence-fill {
  background: linear-gradient(90deg, var(--warning), #f59e0b);
}

.confidence-label {
  font-size: 0.8rem;
  font-weight: 600;
  opacity: 0.8;
  margin-bottom: 0.75rem;
}

/* Result action buttons */
.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255,255,255,0.25);
  border: 1px solid rgba(255,255,255,0.4);
  color: inherit;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.action-btn:hover {
  background: rgba(255,255,255,0.4);
  transform: translateY(-1px);
}

.retry-btn {
  display: none;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.75rem;
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.35);
  color: inherit;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}
.retry-btn:hover { background: rgba(255,255,255,0.35); }

/* ==============================
   HISTORY CARD
   ============================== */
.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  padding-bottom: 0.5rem;
}

.history-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.history-toggle {
  transition: transform var(--transition);
  color: var(--text-secondary);
}

.history-items { display: none; margin-top: 1rem; }
.history-items.show { display: block; }

.history-item {
  background: rgba(255,255,255,0.4);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  margin-bottom: 0.6rem;
  transition: transform var(--transition), box-shadow var(--transition);
}
body.dark .history-item { background: rgba(31,41,55,0.4); }
.history-item:hover { transform: translateY(-1px); box-shadow: var(--shadow-sm); }

.history-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.35rem;
  gap: 0.5rem;
}

.history-result {
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--text-primary);
}

.history-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.history-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==============================
   HOW IT WORKS SECTION
   ============================== */
.how-it-works-section {
  margin: 2rem 0;
  text-align: center;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.step-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.step-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }

.step-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.step-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.step-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==============================
   DASHBOARD CARD
   ============================== */
.dashboard-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 2rem;
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
}

/* Subtle top gradient accent line */
.dashboard-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.dashboard-title-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.dashboard-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(79,70,229,0.35);
}

.dashboard-card h2 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.01em;
}

.dashboard-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--success);
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  padding: 0.3rem 0.8rem;
  border-radius: 2rem;
}
.dashboard-badge::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse-dot 1.8s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%,100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.4; transform: scale(1.5); }
}

/* ── Filters ── */
.dashboard-filters {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  align-items: flex-start;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.filter-label {
  font-size: 0.68rem;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ── Pill toggles (model selection) ── */
.pill-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 1rem;
  border-radius: 2rem;
  border: 1.5px solid var(--border);
  background: rgba(255,255,255,0.5);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  user-select: none;
  backdrop-filter: blur(8px);
}
body.dark .pill {
  background: rgba(31,41,55,0.5);
}
.pill:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(79,70,229,0.07);
  transform: translateY(-1px);
  box-shadow: 0 3px 10px rgba(79,70,229,0.15);
}
.pill.active {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(79,70,229,0.12), rgba(124,58,237,0.08));
  color: var(--primary);
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(79,70,229,0.2);
}
body.dark .pill.active {
  background: linear-gradient(135deg, rgba(99,102,241,0.2), rgba(139,92,246,0.12));
}

.pill-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 0 2px rgba(255,255,255,0.4);
}

/* ── Segmented controls (dataset / metric) ── */
.segmented {
  display: inline-flex;
  background: rgba(0,0,0,0.06);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 3px;
  gap: 2px;
}
body.dark .segmented {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.08);
}

.seg-btn {
  padding: 0.38rem 0.9rem;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: inherit;
}
.seg-btn:hover { color: var(--text-primary); background: rgba(255,255,255,0.4); }
body.dark .seg-btn:hover { background: rgba(255,255,255,0.06); }

.seg-btn.active {
  background: #fff;
  color: var(--primary);
  font-weight: 700;
  box-shadow: 0 1px 6px rgba(0,0,0,0.12), 0 0 0 1px rgba(79,70,229,0.1);
}
body.dark .seg-btn.active {
  background: rgba(99,102,241,0.22);
  color: #a5b4fc;
  box-shadow: none;
}

/* ── Stat cards ── */
.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.85rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  position: relative;
  background: rgba(255,255,255,0.55);
  border: 1px solid rgba(255,255,255,0.6);
  border-radius: var(--radius);
  padding: 1.1rem 1rem;
  text-align: center;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  backdrop-filter: blur(8px);
}
body.dark .stat-card {
  background: rgba(31,41,55,0.55);
  border-color: rgba(255,255,255,0.07);
}
.stat-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: var(--stat-accent, linear-gradient(90deg, var(--primary), var(--secondary)));
  border-radius: 0 0 var(--radius) var(--radius);
}
.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(79,70,229,0.18);
}

.stat-card-label {
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.stat-card-value {
  font-size: 1.75rem;
  font-weight: 900;
  line-height: 1;
  margin-bottom: 0.3rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-card-model {
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Chart area ── */
.chart-box {
  position: relative;
  height: 260px;
  background: rgba(255,255,255,0.35);
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: var(--radius);
  padding: 1rem 1rem 0.5rem;
  margin-bottom: 1.25rem;
  backdrop-filter: blur(6px);
}
body.dark .chart-box {
  background: rgba(17,24,39,0.4);
  border-color: rgba(255,255,255,0.06);
}

/* ── Chart legend ── */
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.legend-swatch {
  width: 12px; height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* ── Summary box ── */
.summary-box {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  background: linear-gradient(135deg, rgba(79,70,229,0.07), rgba(124,58,237,0.04));
  border: 1px solid rgba(79,70,229,0.18);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}
body.dark .summary-box {
  background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(139,92,246,0.06));
  border-color: rgba(99,102,241,0.2);
}

.summary-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 0.05rem;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
}

.summary-box h3 {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.3rem;
}

.summary-box p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin: 0;
}

/* ==============================
   TOAST
   ============================== */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--card-bg);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(12px);
  font-size: 0.875rem;
  font-weight: 500;
  max-width: 280px;
  z-index: 9000;
  transform: translateY(80px);
  opacity: 0;
  transition: transform var(--transition), opacity var(--transition);
  pointer-events: none;
}
.toast.show { transform: translateY(0); opacity: 1; }

/* ==============================
   FOOTER
   ============================== */
.footer {
  background: rgba(248,250,252,0.98);
  border-top: 1px solid var(--border);
  padding: 3rem 0 2rem;
  margin-top: 2rem;
}
body.dark .footer {
  background: rgba(17,24,39,0.98);
  border-top-color: rgba(255,255,255,0.08);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 3fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-brand { display: flex; flex-direction: column; gap: 0.75rem; }

.footer-logo { display: flex; align-items: center; gap: 0.6rem; }

.footer-logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
}

.footer-logo-text {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.footer-column { display: flex; flex-direction: column; gap: 0.75rem; }

.footer-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.25rem;
}

.footer-list { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }

.footer-link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}
.footer-link:hover { color: var(--primary); }

.footer-social { display: flex; gap: 0.75rem; align-items: flex-start; }

.social-link {
  width: 38px; height: 38px;
  background: rgba(79,70,229,0.08);
  color: var(--primary);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition);
}
.social-link:hover { background: rgba(79,70,229,0.15); transform: translateY(-2px); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-heart {
  color: #ef4444;
  animation: heartbeat 1.8s ease-in-out infinite;
  display: flex;
}
@keyframes heartbeat {
  0%,100% { transform: scale(1); }
  25%      { transform: scale(1.12); }
  50%      { transform: scale(1.06); }
}

/* ==============================
   RESPONSIVE — TABLET (≤ 1024px)
   ============================== */
@media (max-width: 1024px) {
  .footer-content { grid-template-columns: 1fr 2fr; }
  .footer-social { grid-column: 1 / -1; }
}

/* ==============================
   RESPONSIVE — MOBILE (≤ 768px)
   ============================== */
@media (max-width: 768px) {
  :root { --navbar-h: 60px; }

  .nav-center { display: none; }
  .nav-right .btn-secondary { display: none; }
  .nav-right .user-menu { display: none !important; }
  .mobile-menu-btn { display: flex; }

  .container { padding-top: calc(var(--navbar-h) + 1.5rem); padding-left: 1rem; padding-right: 1rem; }

  .hero-title { font-size: clamp(2rem, 10vw, 3rem); }
  .hero-subtitle { font-size: 1rem; padding: 0 0.5rem; }

  .main-card,
  .history-card,
  .dashboard-card { padding: 1.25rem; }

  .steps-grid { grid-template-columns: 1fr; gap: 1rem; }

  .result-actions { flex-direction: column; }

  .footer-content { grid-template-columns: 1fr; gap: 2rem; text-align: center; }
  .footer-links { grid-template-columns: repeat(3, 1fr); }
  .footer-social { justify-content: center; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .dashboard-filters { flex-direction: column; }
  .filter-group select { min-width: 100%; }
  .filter-row { flex-direction: column; }
  .segmented { width: 100%; justify-content: stretch; }
  .seg-btn { flex: 1; }

  .toast { left: 1rem; right: 1rem; max-width: none; }
}

/* ==============================
   RESPONSIVE — SMALL MOBILE (≤ 480px)
   ============================== */
@media (max-width: 480px) {
  .hero-title { font-size: clamp(1.75rem, 12vw, 2.5rem); }

  .sample-buttons { flex-direction: column; }
  .sample-btn { width: 100%; text-align: left; }

  .footer-links { grid-template-columns: 1fr; gap: 1.5rem; }

  .btn-primary { font-size: 1rem; padding: 0.85rem 1rem; }
}

/* ==============================
   AUTH MODAL
   ============================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fadeIn 0.2s ease;
}
.modal-overlay[hidden] { display: none; }

@keyframes fadeIn  { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(24px) scale(0.97); }
                     to   { opacity: 1; transform: translateY(0)     scale(1);    } }

.modal {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 32px 64px -12px rgba(0,0,0,0.35);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  width: 100%;
  max-width: 420px;
  padding: 2rem;
  position: relative;
  animation: slideUp 0.25s cubic-bezier(0.34,1.56,0.64,1);
  overflow: hidden;
}

/* Top gradient accent */
.modal::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
}

/* Close button */
.modal-close {
  position: absolute;
  top: 1rem; right: 1rem;
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.modal-close:hover {
  background: var(--error-bg);
  color: var(--error);
  border-color: var(--error-border);
  transform: rotate(90deg);
}

/* Logo */
.modal-logo {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  margin: 0 auto 1.25rem;
  box-shadow: 0 8px 20px rgba(79,70,229,0.35);
}

/* Tabs */
.modal-tabs {
  display: flex;
  background: rgba(0,0,0,0.05);
  border-radius: 10px;
  padding: 3px;
  gap: 3px;
  margin-bottom: 1.5rem;
}
body.dark .modal-tabs { background: rgba(255,255,255,0.05); }

.modal-tab {
  flex: 1;
  padding: 0.5rem;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}
.modal-tab.active {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 1px 6px rgba(0,0,0,0.12);
}
body.dark .modal-tab.active {
  background: rgba(99,102,241,0.22);
  color: #a5b4fc;
  box-shadow: none;
}

/* Title */
.modal-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
  text-align: center;
}

.modal-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 1.5rem;
}

/* Fields */
.modal-field {
  margin-bottom: 1rem;
}

.modal-field label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.field-hint {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: 0;
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 0.85rem;
  color: var(--text-muted);
  pointer-events: none;
  flex-shrink: 0;
}

.input-wrap input {
  width: 100%;
  padding: 0.7rem 2.75rem 0.7rem 2.5rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.6);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
  min-height: unset;
}
body.dark .input-wrap input {
  background: rgba(31,41,55,0.6);
}
.input-wrap input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.12);
}
.input-wrap input::placeholder { color: var(--text-muted); }

.toggle-pw {
  position: absolute;
  right: 0.75rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  display: flex; align-items: center;
  transition: color var(--transition);
}
.toggle-pw:hover { color: var(--primary); }

/* Error message */
.modal-error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  line-height: 1.4;
}
/* Override browser's [hidden] display:none so our display:flex wins */
.modal-error[hidden] { display: none !important; }
.modal-error:not([hidden]) { display: flex !important; }
.modal-error::before { content: '⚠️'; font-size: 1rem; flex-shrink: 0; }

/* Submit button */
.modal-submit {
  width: 100%;
  padding: 0.85rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 0.5rem;
  box-shadow: 0 6px 16px rgba(79,70,229,0.3);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  font-family: inherit;
  margin-top: 0.25rem;
}
.modal-submit:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(79,70,229,0.4);
}
.modal-submit:disabled { opacity: 0.7; cursor: not-allowed; transform: none; }

.modal-submit-spinner {
  display: none;
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* Switch link */
.modal-switch {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 1.1rem;
}

.modal-switch-btn {
  background: none;
  border: none;
  color: var(--primary);
  font-weight: 700;
  cursor: pointer;
  font-size: inherit;
  font-family: inherit;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.modal-switch-btn:hover { color: var(--primary-hover); }

/* Avatar initial badge in navbar */
.avatar-badge {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-size: 0.8rem;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(79,70,229,0.35);
}

/* Mobile responsive */
@media (max-width: 480px) {
  .modal { padding: 1.5rem 1.25rem; }
  .modal-title { font-size: 1.15rem; }
}

/* ==============================
   SECONDARY PAGES — SHARED
   ============================== */

/* Page hero banner */
.page-hero {
  background: linear-gradient(135deg, rgba(79,70,229,0.08) 0%, rgba(124,58,237,0.05) 50%, rgba(6,182,212,0.04) 100%);
  border-bottom: 1px solid var(--border);
  padding: calc(var(--navbar-h) + 3rem) 1.5rem 3rem;
  text-align: center;
}
body.dark .page-hero {
  background: linear-gradient(135deg, rgba(79,70,229,0.12) 0%, rgba(124,58,237,0.08) 50%, rgba(6,182,212,0.06) 100%);
}

.page-hero-inner { max-width: 640px; margin: 0 auto; }

.page-hero-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  display: block;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.1));
}

.page-hero-title {
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.15;
}

.page-hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Page container */
.page-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* Content cards */
.content-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
  padding: 1.75rem;
  margin-bottom: 1.25rem;
}

.content-card p {
  color: var(--text-secondary);
  line-height: 1.75;
  font-size: 0.95rem;
}

.content-card-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.content-card-header h2 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
}

.content-card-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
}

/* Highlight card (accent border top) */
.highlight-card {
  position: relative;
  overflow: hidden;
}
.highlight-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
}

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  background: rgba(79,70,229,0.05);
  border: 1px solid rgba(79,70,229,0.1);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  font-weight: 500;
}

/* Feature list */
.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.feature-list a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}
.feature-list a:hover { text-decoration: underline; }

.feature-check { flex-shrink: 0; }

code {
  background: rgba(79,70,229,0.08);
  color: var(--primary);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
  font-family: 'Courier New', monospace;
}

/* CTA row */
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius);
  border: 2px solid var(--primary);
  background: transparent;
  color: var(--primary);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  font-family: inherit;
  transition: all var(--transition);
}
.btn-outline:hover {
  background: rgba(79,70,229,0.06);
  transform: translateY(-1px);
}

/* ==============================
   CONTACT PAGE
   ============================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 1.5rem;
  align-items: start;
}

.contact-form-card .modal-field { margin-bottom: 1rem; }
.contact-form-card .modal-field label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
  display: block;
}

/* ==============================
   BLOG PAGE
   ============================== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.blog-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}
.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.blog-card-img-wrap {
  background: linear-gradient(135deg, rgba(79,70,229,0.08), rgba(99,102,241,0.04));
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
}

.blog-card-img {
  width: 72px;
  height: 72px;
  object-fit: contain;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.12));
}

.blog-card-body {
  padding: 1.25rem 1.5rem 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--primary);
  background: rgba(79,70,229,0.08);
  border: 1px solid rgba(79,70,229,0.15);
  padding: 0.2rem 0.6rem;
  border-radius: 2rem;
  margin-bottom: 0.75rem;
  width: fit-content;
}

.blog-card-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
  line-height: 1.3;
}

.blog-card-subtitle {
  font-size: 0.82rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.blog-card-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  flex: 1;
}

.blog-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.blog-meta-item {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(0,0,0,0.04);
  border-radius: 2rem;
  padding: 0.2rem 0.6rem;
}
body.dark .blog-meta-item { background: rgba(255,255,255,0.06); }

/* ==============================
   LEGAL PAGES (Privacy / Disclaimer)
   ============================== */
.legal-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  align-items: start;
}

.legal-toc {
  position: sticky;
  top: calc(var(--navbar-h) + 1.5rem);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  backdrop-filter: blur(12px);
}

.toc-title {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.toc-list {
  list-style: none;
  counter-reset: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0;
  margin: 0;
}

.toc-link {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.3rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  line-height: 1.4;
}
.toc-link:hover {
  color: var(--primary);
  background: rgba(79,70,229,0.06);
}

.legal-intro {
  font-size: 1rem !important;
  color: var(--text-primary) !important;
  font-weight: 500;
  line-height: 1.7 !important;
}

/* ==============================
   404 PAGE
   ============================== */
.error-page {
  text-align: center;
  padding: calc(var(--navbar-h) + 4rem) 1.5rem 4rem;
  max-width: 560px;
  margin: 0 auto;
}

.error-number {
  font-size: clamp(5rem, 20vw, 9rem);
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.error-emoji {
  font-size: 3rem;
  margin-bottom: 1rem;
  display: block;
}

.error-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.error-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 2rem;
}

/* ==============================
   RESPONSIVE — SECONDARY PAGES
   ============================== */
@media (max-width: 768px) {
  .page-hero { padding: calc(var(--navbar-h) + 2rem) 1rem 2rem; }
  .page-container { padding: 1.5rem 1rem 3rem; }

  .contact-grid { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr; }
  .legal-layout { grid-template-columns: 1fr; }
  .legal-toc { position: static; }
  .feature-grid { grid-template-columns: 1fr; }
  .cta-row { flex-direction: column; align-items: stretch; }
  .btn-outline { text-align: center; justify-content: center; }
}

@media (max-width: 480px) {
  .page-hero-title { font-size: 1.6rem; }
  .content-card { padding: 1.25rem; }
  .blog-card-body { padding: 1rem 1.25rem 1.25rem; }
}

/* ==============================
   ABOUT PAGE
   ============================== */
.about-hero { position: relative; overflow: hidden; }
.about-hero::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  height: 60px;
  background: var(--bg);
  clip-path: ellipse(55% 100% at 50% 100%);
}

.about-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  background: rgba(79,70,229,0.1);
  border: 1px solid rgba(79,70,229,0.2);
  padding: 0.3rem 0.85rem;
  border-radius: 2rem;
  margin-bottom: 1rem;
}
.about-hero-badge::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse-dot 1.8s ease-in-out infinite;
}

.about-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 1.75rem;
}

/* Stats row */
.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.about-stat {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.25rem 1rem;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.about-stat::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}
.about-stat:hover { transform: translateY(-3px); box-shadow: var(--shadow); }

.about-stat-value {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
  margin-bottom: 0.35rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-stat-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
}

/* Models grid */
.about-models-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.about-model-chip {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(255,255,255,0.5);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  transition: transform var(--transition), box-shadow var(--transition);
}
body.dark .about-model-chip { background: rgba(31,41,55,0.5); }
.about-model-chip:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }

.about-model-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--chip-color, var(--primary));
  flex-shrink: 0;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--chip-color, var(--primary)) 20%, transparent);
}

.about-model-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.about-model-acc {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* GSSoC card */
.gssoc-card {
  background: linear-gradient(135deg,
    rgba(79,70,229,0.06) 0%,
    rgba(124,58,237,0.04) 50%,
    rgba(6,182,212,0.03) 100%) !important;
  border-color: rgba(79,70,229,0.15) !important;
}

.gssoc-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.gssoc-badge-wrap {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 6px 16px rgba(79,70,229,0.3);
}

.gssoc-emoji { font-size: 1.6rem; }

/* Features two-col */
.features-two-col {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
  margin-top: 0.25rem;
}

.feature-check-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.85rem;
  background: rgba(255,255,255,0.4);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
body.dark .feature-check-item { background: rgba(31,41,55,0.4); }
.feature-check-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }

.fci-icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.feature-check-item strong {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.feature-check-item span {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* CTA card */
.about-cta-card {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-lg);
  padding: 2rem 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
  box-shadow: 0 12px 32px rgba(79,70,229,0.35);
}

.about-cta-text h2 {
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.35rem;
}

.about-cta-text p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.8);
  margin: 0;
}

.about-cta-card .btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
.about-cta-card .btn-primary:hover { background: rgba(255,255,255,0.92); }

.about-cta-card .btn-outline {
  border-color: rgba(255,255,255,0.5);
  color: #fff;
}
.about-cta-card .btn-outline:hover { background: rgba(255,255,255,0.12); border-color: #fff; }

/* Responsive */
@media (max-width: 768px) {
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .about-models-grid { grid-template-columns: 1fr; }
  .features-two-col { grid-template-columns: 1fr; }
  .about-cta-card { flex-direction: column; text-align: center; padding: 1.5rem; }
  .about-cta-card .cta-row { justify-content: center; }
  .gssoc-header { flex-direction: column; align-items: center; text-align: center; }
}

@media (max-width: 480px) {
  .about-stats { grid-template-columns: repeat(2, 1fr); gap: 0.6rem; }
  .about-stat-value { font-size: 1.6rem; }
}