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

:root {
  --violet-50: #FAF3FE;
  --violet-300: #D59AF6;
  --violet-500: #BD5CF3;
  --violet-600: #A923F3;
  --violet-700: #9C02F1;
  --violet: var(--violet-600);
}

body.light {
  --bg-main: var(--violet-50);
  --bg-elevated: #ffffff;
  --bg-header: var(--violet-600);
  --text-main: #1f1026;
  --text-muted: #4b3e68;
  --text-on-header: #ffffff;
  --border-soft: #E3D0F7;
  --shadow-soft: 0 10px 25px rgba(0, 0, 0, 0.06);
  --code-bg: #ffffff;
  --result-bg: #fbf7ff;
  --danger-bg: rgba(239, 68, 68, 0.1);
  --danger: #ef4444;
  --success-bg: rgba(34, 197, 94, 0.1);
  --success: #16a34a;
  --neutral-bg: rgba(169, 35, 243, 0.08);
}

body.dark {
  --bg-main: #090016;
  --bg-elevated: #140824;
  --bg-header: #140824;
  --text-main: #F4E9FF;
  --text-muted: #C4B3E6;
  --text-on-header: #FDF9FF;
  --border-soft: #2D1B3F;
  --shadow-soft: 0 12px 30px rgba(0, 0, 0, 0.7);
  --violet: var(--violet-700);
  --code-bg: #111827;
  --result-bg: #0f172a;
  --danger-bg: rgba(239, 68, 68, 0.12);
  --danger: #f87171;
  --success-bg: rgba(34, 197, 94, 0.12);
  --success: #4ade80;
  --neutral-bg: rgba(156, 2, 241, 0.12);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  background-color: var(--bg-header);
  color: var(--text-on-header);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-soft);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo,
.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-on-header);
  text-decoration: none;
}

.logo-icon { font-size: 2rem; }

.logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.icon-btn {
  width: 2.5rem;
  height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-on-header);
  cursor: pointer;
  border-radius: 0.5rem;
  transition: background 0.3s;
  font-weight: 800;
  font-size: 1rem;
}

.icon-btn:hover { background: rgba(255, 255, 255, 0.2); }
.icon-btn svg { width: 24px; height: 24px; }

.help-dropdown {
  position: relative;
  display: inline-flex;
}

.help-dropdown::after {
  content: "";
  position: absolute;
  top: 100%;
  right: 0;
  width: 260px;
  height: 0.35rem;
}

.help-dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 260px;
  margin-top: 0.35rem;
  background: var(--bg-elevated);
  color: var(--text-main);
  border: 1px solid var(--border-soft);
  border-radius: 0.75rem;
  box-shadow: var(--shadow-soft);
  padding: 0.5rem;
  display: none;
  z-index: 200;
}

.help-dropdown:hover .help-dropdown-menu,
.help-dropdown:focus-within .help-dropdown-menu { display: block; }

.help-dropdown-menu a {
  display: block;
  padding: 0.65rem 0.75rem;
  color: var(--text-main);
  text-decoration: none;
  border-radius: 0.5rem;
  font-size: 0.9rem;
  font-weight: 700;
  white-space: nowrap;
}

.help-dropdown-menu a:hover {
  background: var(--violet);
  color: white;
}

.help-btn-text {
  width: auto;
  min-width: 0;
  height: 2.5rem;
  padding: 0 1rem;
  font-size: 0.9rem;
  line-height: 1;
  white-space: nowrap;
}

.content {
  width: min(1100px, 100%);
  margin: 0 auto;
  padding: 2rem;
  flex: 1;
}

.content-wide { width: min(1280px, 100%); }

.segment {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-soft);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.segment-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--violet);
}

.segment-subtitle {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-soft);
  background: transparent;
  color: var(--text-main);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 700;
  transition: all 0.2s;
}

.btn:hover { background: rgba(128, 128, 128, 0.1); }

.btn-primary,
.btn-primary:hover {
  background-color: var(--violet);
  color: white;
  border-color: var(--violet);
}

.btn-primary:hover { filter: brightness(0.95); }

.btn:disabled,
.tab-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.data-table-container {
  overflow: auto;
  border-radius: 0.5rem;
  border: 1px solid var(--border-soft);
  background: var(--result-bg);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.data-table thead {
  background-color: var(--violet);
  color: white;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-soft);
  white-space: nowrap;
}

.data-table tbody tr:hover { background: rgba(128, 128, 128, 0.08); }

.empty-results {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-style: italic;
  border: 2px dashed var(--border-soft);
  border-radius: 0.5rem;
}

.hidden { display: none !important; }

@media (max-width: 900px) {
  .header {
    gap: 1rem;
    align-items: flex-start;
  }

  .logo-text { font-size: 1.2rem; }
  .content { padding: 1rem; }
  .header-actions { gap: 0.5rem; }
  .help-btn-text { padding: 0 0.75rem; }
}

.footer {
  margin-top: auto;
  padding: 0.85rem 1.5rem;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-soft);
}

.footer-content {
  width: min(1280px, 100%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 700;
}

.footer-disclaimer {
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.footer-github-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 0.4rem;
  padding: 0.25rem;
  transition: color 0.2s, background 0.2s;
}

.footer-github-link:hover {
  color: var(--violet);
  background: var(--neutral-bg);
}

.footer-github-icon {
  width: 1.25rem;
  height: 1.25rem;
}

@media (max-width: 700px) {
  .header {
    flex-wrap: wrap;
    align-items: center;
    padding: 0.85rem 1rem;
  }

  .logo,
  .logo-link {
    min-width: 0;
  }

  .logo-icon {
    font-size: 1.65rem;
  }

  .logo-text {
    font-size: 1.05rem;
    line-height: 1.2;
    word-break: break-word;
  }

  .header-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
    margin-left: auto;
    gap: 0.4rem;
  }

  .icon-btn {
    width: 2.25rem;
    height: 2.25rem;
  }

  .help-btn-text {
    height: 2.25rem;
    padding: 0 0.7rem;
    font-size: 0.82rem;
  }

  .help-dropdown-menu {
    right: 0;
    min-width: min(260px, calc(100vw - 2rem));
    max-width: calc(100vw - 2rem);
  }

  .content {
    padding: 0.85rem;
  }

  .segment {
    padding: 1rem;
    border-radius: 0.65rem;
    margin-bottom: 1rem;
  }

  .segment-title {
    font-size: 1.1rem;
  }

  .segment-subtitle {
    font-size: 0.86rem;
  }

  .data-table {
    font-size: 0.78rem;
  }

  .data-table th,
  .data-table td {
    padding: 0.55rem 0.7rem;
  }

  .empty-results {
    padding: 1.25rem;
  }

  .footer {
    padding: 0.85rem 1rem;
  }

  .footer-content {
    gap: 0.55rem;
    font-size: 0.78rem;
  }

  .footer-disclaimer {
    width: 100%;
    font-size: 0.72rem;
    line-height: 1.35;
  }
}

.help-label-short {
  display: none;
}

@media (max-width: 700px) {
  .help-label-full {
    display: none;
  }

  .help-label-short {
    display: inline;
  }

  .help-btn-text {
    width: auto;
    max-width: none;
    min-width: 0;
    padding: 0 0.7rem;
    white-space: nowrap;
  }

  .header {
    flex-wrap: wrap;
  }

  .header-actions {
    flex: 1 1 auto;
    min-width: 0;
    justify-content: flex-end;
  }
}