/* ============================================================
   SAGAN — Design System
   ============================================================ */

/* 1. CSS Custom Properties */
:root {
  --purple:        #5B3FBF;
  --purple-hover:  #4C34A3;
  --purple-light:  #7C5CDB;
  --purple-faint:  #F3F0FF;
  --purple-glow:   rgba(91, 63, 191, 0.14);

  --text:          #1A1625;
  --text-secondary:#52496B;
  --text-muted:    #9991B5;
  --text-on-dark:  #E5E7EB;

  --bg-page:       #F6F5FA;
  --bg-white:      #FFFFFF;
  --bg-dark:       #0D0D1A;

  --border:        #E4E0F0;
  --border-focus:  #7C5CDB;

  --radius-sm:     6px;
  --radius:        10px;
  --radius-lg:     16px;
  --radius-xl:     24px;

  --shadow-xs:     0 1px 2px rgba(0,0,0,.06);
  --shadow-sm:     0 1px 4px rgba(0,0,0,.08);
  --shadow:        0 4px 14px rgba(0,0,0,.10);
  --shadow-lg:     0 12px 32px rgba(0,0,0,.14);

  --nav-h:         62px;
  --transition:    0.2s ease;
  --transition-slow: 0.4s ease;
}

/* 2. Reset & Base */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 0.9375rem;   /* 15px */
  font-weight: 400;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg-page);
  margin: 0;
  -webkit-font-smoothing: antialiased;
}

/* 3. Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0;
}

.display-sagan {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.lead-sagan {
  font-size: 1.125rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--text-on-dark);
  opacity: 0.8;
}

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

/* 4. Navbar */
.sagan-nav {
  background: var(--purple);
  height: var(--nav-h);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1030;
  box-shadow: 0 2px 12px rgba(0,0,0,.2);
}

.sagan-brand {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #fff !important;
  padding: 0;
}
.sagan-brand:hover { opacity: 0.88; }

.sagan-nav-link {
  color: rgba(255,255,255,0.8) !important;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem !important;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.sagan-nav-link:hover,
.sagan-nav-link.active {
  color: #fff !important;
  background: rgba(255,255,255,0.12);
}

.sagan-nav .navbar-toggler {
  border: 1px solid rgba(255,255,255,.4);
  padding: 0.35rem 0.6rem;
}
.sagan-nav .navbar-toggler i { color: #fff; font-size: 1rem; }

.sagan-nav .navbar-collapse {
  background: var(--purple);
  padding: 0.5rem 1rem 1rem;
}
@media (min-width: 992px) {
  .sagan-nav .navbar-collapse {
    background: transparent;
    padding: 0;
  }
}

/* Object ID badge in objtemplate navbar */
.sagan-obj-badge {
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.95);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  letter-spacing: 0.01em;
}

/* GitHub button */
.btn-github {
  border: 1.5px solid rgba(255,255,255,0.5);
  color: rgba(255,255,255,0.9) !important;
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.btn-github:hover {
  background: rgba(255,255,255,0.15);
  border-color: #fff;
  color: #fff !important;
}

/* 5. Hero (home page) */
.hero {
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    160deg,
    rgba(13, 13, 26, 0.72) 0%,
    rgba(91, 63, 191, 0.45) 60%,
    rgba(13, 13, 26, 0.88) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 2rem 1.5rem;
}

.hero-logo {
  height: clamp(120px, 18vw, 200px);
  filter: drop-shadow(0 0 32px rgba(124, 92, 219, 0.6));
  animation: fadeUp 0.9s ease both;
}

.hero-tagline {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.55);
  margin: 1.25rem 0 0.5rem;
  animation: fadeUp 0.9s 0.15s ease both;
}

.hero-title {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 300;
  color: rgba(255,255,255,0.85);
  max-width: 520px;
  margin: 0 auto 2rem;
  line-height: 1.5;
  animation: fadeUp 0.9s 0.25s ease both;
}

.btn-hero {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--purple);
  color: #fff !important;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.85rem 2.25rem;
  border-radius: var(--radius-xl);
  border: none;
  box-shadow: 0 0 0 0 var(--purple-glow);
  transition: all var(--transition);
  animation: fadeUp 0.9s 0.35s ease both;
}
.btn-hero:hover {
  background: var(--purple-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(91, 63, 191, 0.45);
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  justify-content: center;
  margin-top: 3rem;
  animation: fadeUp 0.9s 0.5s ease both;
}
.hero-stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
}
.hero-stat-label {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.45);
}

/* 6. Page layout */
.page-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

.page-header {
  margin-bottom: 1.75rem;
}
.page-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.025em;
}
.page-header p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0.25rem 0 0;
}

/* 7. Search bar */
.search-wrap {
  position: relative;
  max-width: 420px;
}
.search-wrap .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.875rem;
  pointer-events: none;
}
.search-input {
  width: 100%;
  padding: 0.6rem 1rem 0.6rem 2.5rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.875rem;
  color: var(--text);
  background: var(--bg-white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--purple-glow);
}
.search-input::placeholder { color: var(--text-muted); }
.btn-search {
  padding: 0.6rem 1.1rem;
  background: var(--purple);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition);
  white-space: nowrap;
}
.btn-search:hover { background: var(--purple-hover); }

.result-info {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* 8. Table */
.sagan-table-wrap {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.sagan-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

.sagan-table thead th {
  background: #EDE9FE;
  color: #4C1D95;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.9rem 1rem;
  white-space: nowrap;
  border: none;
  border-bottom: 2px solid #D8B4FE;
  position: sticky;
  top: 0;
  z-index: 2;
}

.sagan-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.sagan-table tbody tr:last-child { border-bottom: none; }
.sagan-table tbody tr:hover { background: var(--purple-faint); cursor: pointer; }

.sagan-table td {
  padding: 0.7rem 1rem;
  color: var(--text-secondary);
  white-space: nowrap;
  vertical-align: middle;
}

.tic-link {
  font-weight: 600;
  color: var(--purple) !important;
  font-size: 0.875rem;
}
.tic-link:hover { color: var(--purple-hover) !important; }

.badge-disposition {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.badge-kp  { background: #DCFCE7; color: #166534; }
.badge-cp  { background: #DBEAFE; color: #1e40af; }
.badge-pc  { background: #FEF9C3; color: #854d0e; }
.badge-fp  { background: #FEE2E2; color: #991b1b; }
.badge-default { background: var(--purple-faint); color: var(--purple); }

/* 9. Pagination */
.sagan-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
  background: var(--bg-white);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.pagination-info {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.pagination-controls {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.pg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 0.5rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-white);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
}
.pg-btn:hover {
  border-color: var(--purple);
  color: var(--purple);
  background: var(--purple-faint);
}
.pg-btn.active {
  background: var(--purple);
  border-color: var(--purple);
  color: #fff;
}
.pg-btn.disabled {
  opacity: 0.35;
  pointer-events: none;
}
.pg-ellipsis {
  color: var(--text-muted);
  font-size: 0.8125rem;
  padding: 0 0.25rem;
  line-height: 32px;
}

/* 10. Modal (observation list) */
.sagan-modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(13, 13, 26, 0.55);
  backdrop-filter: blur(3px);
  z-index: 1040;
  align-items: center;
  justify-content: center;
}
.sagan-modal-backdrop.open { display: flex; }

.sagan-modal {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: min(600px, 94vw);
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  animation: scaleIn 0.22s ease;
  overflow: hidden;
}

.sagan-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 1.4rem;
  border-bottom: 1px solid var(--border);
}
.sagan-modal-header h5 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
}
.sagan-modal-close {
  background: none;
  border: none;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.sagan-modal-close:hover { background: #F3F4F6; color: var(--text); }

.sagan-modal-body {
  overflow-y: auto;
  flex: 1;
}

.obs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}
.obs-table thead th {
  background: var(--purple-faint);
  color: var(--purple);
  font-weight: 600;
  font-size: 0.6875rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid #DDD6FE;
}
.obs-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.obs-table tbody tr:last-child { border-bottom: none; }
.obs-table tbody tr:hover { background: var(--purple-faint); cursor: pointer; }
.obs-table td {
  padding: 0.65rem 1rem;
  color: var(--text-secondary);
  vertical-align: middle;
}
.obs-table a {
  color: var(--purple);
  font-weight: 500;
  display: block;
}
.obs-table a:hover { color: var(--purple-hover); }

/* 11. Spinner */
.sagan-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid rgba(91, 63, 191, 0.2);
  border-top-color: var(--purple);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}
.sagan-spinner-sm {
  width: 20px;
  height: 20px;
  border-width: 2px;
}

.modal-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1rem;
  gap: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* 12. Loading overlay (Lightkurve) */
.loading-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(13, 13, 26, 0.88);
  z-index: 2000;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}
.loading-overlay.active { display: flex; }
.loading-overlay .sagan-spinner {
  width: 52px;
  height: 52px;
  border-width: 4px;
  border-color: rgba(255,255,255,0.15);
  border-top-color: var(--purple-light);
}
.loading-overlay p {
  color: rgba(255,255,255,0.75);
  font-size: 0.9375rem;
  font-weight: 400;
  margin: 0;
}
.loading-overlay small {
  color: rgba(255,255,255,0.35);
  font-size: 0.75rem;
}

/* 13. Chart / Object page */
.chart-page {
  background: var(--bg-page);
  min-height: calc(100vh - var(--nav-h));
  padding: 1.5rem;
}

.chart-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.chart-card-header {
  padding: 1rem 1.4rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.chart-card-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}
.chart-card-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Chart sizing — wrapper keeps height, placeholder overlays absolutely */
.chart-wrap {
  position: relative;
  width: 100%;
  height: calc(100vh - var(--nav-h) - 178px);
  min-height: 420px;
}
#lightcurve {
  width: 100%;
  height: 100%;
}
.chart-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  background: var(--bg-white);
  z-index: 2;
  transition: opacity 0.3s ease;
}
.chart-placeholder.hidden {
  opacity: 0;
  pointer-events: none;
}

.chart-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.9rem 1.4rem;
  border-top: 1px solid var(--border);
  background: var(--bg-white);
}

.btn-tool {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-white);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
}
.btn-tool:hover {
  border-color: var(--purple);
  color: var(--purple);
  background: var(--purple-faint);
}
.btn-tool i { font-size: 0.75rem; }

.dropdown-menu-sagan {
  min-width: 180px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.35rem;
  background: var(--bg-white);
}
.dropdown-item-sagan {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.dropdown-item-sagan:hover {
  background: var(--purple-faint);
  color: var(--purple);
}

/* 14. About page */
.about-page {
  min-height: calc(100vh - var(--nav-h));
  background: linear-gradient(150deg, #0D0B1E 0%, #1A0F38 40%, #0F1A2E 100%);
  position: relative;
}
.about-content {
  position: relative;
  z-index: 1;
  padding: 3.5rem 1.5rem;
  max-width: 800px;
  margin: 0 auto;
}
.about-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 2rem 2.5rem;
  backdrop-filter: blur(12px);
}
.about-section-title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--purple-light);
  margin-bottom: 0.5rem;
}
.about-title {
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}
.about-text {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.75);
}
.about-text + .about-text { margin-top: 1rem; }

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.tech-chip {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: rgba(255,255,255,0.75);
  text-align: center;
}

/* 15. Keyframe animations */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.94); }
  to   { opacity: 1; transform: scale(1); }
}

/* 16. Page fade-in — opacity only so position:fixed children aren't clipped */
.page-fade {
  animation: fadeIn 0.35s ease both;
}

/* 17. Filter bar */
.filter-bar {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-xs);
}
.filter-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}
.filter-select {
  padding: 0.57rem 2rem 0.57rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.8125rem;
  color: var(--text);
  background: var(--bg-white) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%239991B5'/%3E%3C/svg%3E") no-repeat right 0.65rem center;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.filter-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--purple-glow);
}
.btn-clear {
  padding: 0.57rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-white);
  text-decoration: none;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-clear:hover {
  border-color: #EF4444;
  color: #EF4444;
  background: #FEF2F2;
}

/* 18. Sortable column headers */
.sort-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
}
.sort-link:hover { color: #7C3AED; }
.sort-link.sorted { color: #4C1D95; }
.sort-link i { font-size: 0.6875rem; }

/* 19. Analysis panel */
.analysis-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
}
.analysis-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--border);
  user-select: none;
}
.analysis-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}
.analysis-subtitle {
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--purple-faint);
  color: var(--purple);
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
}
.analysis-toggle-icon {
  color: var(--text-muted);
  font-size: 0.75rem;
  transition: transform 0.2s;
}
.analysis-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  padding: 1.25rem;
}
@media (max-width: 700px) {
  .analysis-body { grid-template-columns: 1fr; }
}

.func-label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  display: block;
  margin-bottom: 0.5rem;
}
.func-desc {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin: 0.6rem 0;
  min-height: 2rem;
}
.func-params { margin-top: 0.75rem; }
.param-row { margin-bottom: 0.65rem; }
.param-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 0.3rem;
}
.func-error {
  font-size: 0.8125rem;
  color: #DC2626;
  background: #FEF2F2;
  border: 1px solid #FECACA;
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  margin-top: 0.5rem;
}
.btn-apply {
  width: 100%;
  margin-top: 0.85rem;
  padding: 0.6rem 1rem;
  background: var(--purple);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}
.btn-apply:hover:not(:disabled) { background: var(--purple-hover); }
.btn-apply:disabled { opacity: 0.45; cursor: not-allowed; }

/* Applied functions history */
.func-history-col { display: flex; flex-direction: column; }
.btn-hist-action {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.7rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-white);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-hist-action:hover {
  border-color: var(--purple);
  color: var(--purple);
  background: var(--purple-faint);
}
.func-list {
  flex: 1;
  min-height: 80px;
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.func-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 80px;
  color: var(--text-muted);
  font-size: 0.8125rem;
}
.func-tag {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--purple-faint);
  border: 1px solid #DDD6FE;
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.6rem;
  font-size: 0.8125rem;
}
.func-tag-num {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--purple);
  background: #DDD6FE;
  border-radius: 999px;
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.func-tag-label {
  font-weight: 600;
  color: #4C1D95;
  white-space: nowrap;
}
.func-tag-params {
  font-size: 0.75rem;
  color: var(--purple);
  opacity: 0.7;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.func-tag-remove {
  background: none;
  border: none;
  color: #7C3AED;
  font-size: 0.75rem;
  cursor: pointer;
  padding: 0.1rem 0.25rem;
  border-radius: 3px;
  transition: all var(--transition);
  flex-shrink: 0;
}
.func-tag-remove:hover { background: #EDE9FE; color: #DC2626; }

.func-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
}

/* 20. Compare mode */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
}
@media (max-width: 900px) {
  .compare-grid { grid-template-columns: 1fr; }
}
.compare-panel { background: var(--bg-white); }
.compare-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border);
}
#chartOriginal, #chartModified { width: 100%; height: 100%; }

/* Active tool button */
.btn-tool-active {
  background: var(--purple-faint) !important;
  border-color: var(--purple) !important;
  color: var(--purple) !important;
}

/* 21. Docs / Tutorial / Theory pages */
.docs-body { display: flex; flex-direction: column; gap: 0; }

.docs-step {
  display: flex;
  gap: 1.25rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}
.docs-step:last-child { border-bottom: none; }
.docs-step-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background: var(--purple);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 700;
  margin-top: 0.15rem;
}
.docs-step-content { flex: 1; }
.docs-step-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.6rem;
}
.docs-step-content p { font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 0.6rem; }

.docs-section {
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--border);
}
.docs-section:last-child { border-bottom: none; }
.docs-section-title {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.85rem;
  letter-spacing: -0.015em;
}
.docs-section p { font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.75; margin-bottom: 0.75rem; }
.docs-section p:last-child { margin-bottom: 0; }

.docs-list {
  padding-left: 1.25rem;
  margin: 0.5rem 0;
}
.docs-list li {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 0.4rem;
}

.docs-tip {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  background: var(--purple-faint);
  border: 1px solid #DDD6FE;
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin: 0.85rem 0;
  font-size: 0.875rem;
  color: #4C1D95;
  line-height: 1.6;
}
.docs-tip i { margin-top: 0.1rem; flex-shrink: 0; }

/* Function cards grid (tutorial) */
.docs-func-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}
.docs-func-card {
  background: var(--bg-page);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
}
.docs-func-name {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--purple);
  margin-bottom: 0.35rem;
}
.docs-func-card p {
  font-size: 0.8125rem !important;
  color: var(--text-secondary) !important;
  line-height: 1.6 !important;
  margin: 0 !important;
}

.docs-footer {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

/* Theory-specific */
.theory-diagram {
  background: var(--bg-page);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 1.25rem 0;
  text-align: center;
}
.theory-diagram-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}
.diagram-star {
  font-size: 2.5rem;
  color: #F59E0B;
  filter: drop-shadow(0 0 8px rgba(245, 158, 11, 0.5));
}
.diagram-orbit {
  position: relative;
  width: 80px;
  height: 40px;
  border: 1.5px dashed var(--border);
  border-radius: 50%;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.diagram-planet {
  font-size: 0.875rem;
  color: var(--purple);
  margin-bottom: -0.45rem;
}
.diagram-arrow { font-size: 1.5rem; color: var(--text-muted); }
.diagram-lc { width: 200px; }
.diagram-lc svg { width: 100%; height: auto; }
.diagram-caption {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.85rem;
  margin-bottom: 0;
}

.theory-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 0.75rem;
  margin: 1.25rem 0;
}
.theory-info-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  box-shadow: var(--shadow-xs);
}
.theory-info-title {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.35rem;
}
.theory-info-card p {
  font-size: 0.8125rem !important;
  color: var(--text-secondary) !important;
  line-height: 1.6 !important;
  margin: 0 !important;
}

.theory-table-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 1rem 0;
}
.theory-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.theory-table thead th {
  background: #EDE9FE;
  color: #4C1D95;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.75rem 1rem;
  text-align: left;
}
.theory-table tbody tr { border-bottom: 1px solid var(--border); }
.theory-table tbody tr:last-child { border-bottom: none; }
.theory-table td {
  padding: 0.7rem 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  vertical-align: top;
}
.theory-table td:first-child { white-space: nowrap; }

.theory-disposition-grid { display: flex; flex-direction: column; gap: 0.85rem; margin: 1rem 0; }
.theory-disp-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
}
.theory-disp-card > span { flex-shrink: 0; }
.theory-disp-card > div p {
  font-size: 0.875rem !important;
  color: var(--text-secondary) !important;
  margin: 0.2rem 0 0 !important;
}

.theory-func-section {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px dashed var(--border);
}
.theory-func-section:last-child { border-bottom: none; margin-bottom: 0; }
.theory-func-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--purple);
  margin-bottom: 0.5rem;
}
.theory-func-section p {
  font-size: 0.9375rem !important;
  color: var(--text-secondary) !important;
  line-height: 1.75 !important;
  margin-bottom: 0.6rem !important;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ============================================================
   Figuras (Teoria / Sobre) — SVG gerado por scripts/make_figures.py
   ============================================================ */
.figure {
  position: relative;
  margin: 1.5rem 0;
  padding: 1rem 1rem 0.85rem;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.figure figcaption {
  margin-top: 0.6rem;
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--text-secondary);
}
.figure .fig-num { font-weight: 600; color: var(--text); }
.figure .fig-source { display: block; margin-top: 0.25rem; color: var(--text-muted); font-size: 0.75rem; }
.fig-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
@media (max-width: 640px) { .fig-pair { grid-template-columns: 1fr; } }

.sg-chart { display: block; width: 100%; height: auto; font-family: 'Inter', system-ui, sans-serif; overflow: visible; }
.sg-grid      { stroke: #ECE9F5; stroke-width: 1; }
.sg-axis, .sg-tickmark { stroke: #CFC9E3; stroke-width: 1; }
.sg-tick      { font-size: 11px; fill: #7A7196; font-variant-numeric: tabular-nums; }
.sg-label     { font-size: 12px; fill: #52496B; }
.sg-line      { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.sg-key       { stroke-width: 3; stroke-linecap: round; }
.sg-legend    { font-size: 12px; fill: #52496B; }
.sg-direct    { font-size: 12px; font-weight: 500; fill: #1A1625; }
.sg-note      { font-size: 11px; fill: #7A7196; }
.sg-ref       { stroke: #CFC9E3; stroke-width: 1; }
.sg-gap       { fill: #F6F5FA; }
.sg-cat       { font-size: 12.5px; fill: #1A1625; }
.sg-value     { font-size: 12px; fill: #52496B; font-variant-numeric: tabular-nums; }
.sg-bar       { cursor: default; transition: opacity .15s; }
.sg-bar:hover { opacity: .8; }
.sg-mark      { stroke: #fff; stroke-width: 2; }
.sg-path      { stroke: #7A7196; stroke-width: 1.5; fill: none; }
.sg-dim       { stroke: #7A7196; stroke-width: 1.2; }
.sg-guide     { stroke: #E4E0F0; stroke-width: 1; }
.sg-flow      { stroke: #7A7196; stroke-width: 1.5; }
.sg-arrowhead { fill: #7A7196; }
.sg-node        { fill: #fff; stroke: #CFC9E3; stroke-width: 1.2; }
.sg-node-accent { fill: #F3F0FF; stroke: #7C5CDB; }
.sg-node-good   { fill: #EEFBEF; stroke: #0ca30c; }
.sg-node-bad    { fill: #FDF0F0; stroke: #d03b3b; }
.sg-node-t    { font-size: 13px; font-weight: 600; fill: #1A1625; }
.sg-node-s    { font-size: 11px; fill: #52496B; }
.sg-cross     { stroke: #9991B5; stroke-width: 1; }
.sg-hl        { stroke: #fff; stroke-width: 2; }
.sg-tooltip {
  position: absolute; z-index: 5; pointer-events: none;
  transform: translate(-50%, calc(-100% - 12px));
  background: #1A1625; color: #fff;
  font-size: 12px; line-height: 1.3; padding: 0.35rem 0.6rem;
  border-radius: 6px; white-space: nowrap;
  opacity: 0; transition: opacity .1s;
  font-variant-numeric: tabular-nums;
}
.sg-tooltip.on { opacity: 1; }
.fig-data { margin-top: 0.5rem; font-size: 0.8125rem; }
.fig-data summary { cursor: pointer; color: var(--purple); }
.fig-data table { margin-top: 0.5rem; width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.fig-data td, .fig-data th { padding: 0.25rem 0.5rem; border-bottom: 1px solid var(--border); text-align: left; }
.fig-data td:last-child, .fig-data th:last-child { text-align: right; }

/* Equações e referências */
.eq {
  margin: 1rem 0; padding: 0.75rem 1rem;
  background: var(--purple-faint); border-radius: var(--radius-sm);
  font-family: 'Cambria Math', 'STIX Two Math', Georgia, serif; font-size: 1.05rem;
  text-align: center; color: var(--text); overflow-x: auto;
}
.eq small { display: block; margin-top: 0.3rem; font-family: 'Inter', system-ui, sans-serif; font-size: 0.75rem; color: var(--text-muted); }
.cite { font-size: 0.8em; vertical-align: super; line-height: 0; }
.cite a { color: var(--purple); text-decoration: none; }
.refs { padding-left: 1.4rem; }
.refs li { font-size: 0.8125rem; line-height: 1.6; color: var(--text-secondary); margin-bottom: 0.45rem; }
.refs li:target { background: var(--purple-faint); border-radius: 4px; }
.refs a { color: var(--purple); word-break: break-word; }
.fact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 0.75rem; margin: 1rem 0; }
.fact { background: var(--bg-white); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.75rem 0.9rem; }
.fact-value { font-size: 1.25rem; font-weight: 600; color: var(--text); }
.fact-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.15rem; line-height: 1.4; }
.about-text a { color: #C4B5FD; }
.about-card .figure { margin: 1.25rem 0; }
.about-card .refs li { color: rgba(255,255,255,0.7); }
.about-card .refs a { color: #C4B5FD; }
.about-h2 { font-size: 1.05rem; font-weight: 600; color: #fff; margin: 1.75rem 0 0.6rem; }