:root {
  --bg: #f6f7fb;
  --text: #1f2933;
  --muted: #4a5568;
  --card-bg: #fff;
  --card-border: #e5e7eb;
  --border: #d6d9e0;
  --nav-bg: #111827;
  --nav-text: #e5e7eb;
  --nav-link: #cbd5e1;
  --nav-hover-bg: #1f2937;
  --nav-hover-text: #fff;
  --link: #2563eb;
  --link-bg: #e8f0ff;
  --link-hover-bg: #d8e7ff;
  --btn-primary: #2563eb;
  --btn-primary-hover: #1d4ed8;
  --btn-secondary: #0fb69f;
  --btn-secondary-hover: #0b8f7d;
  --danger: #e11d48;
  --danger-hover: #be123c;
  --upload-bg: #10b981;
  --pill-bg: #e5e7eb;
  --pill-border: #cbd5e1;
  --pill-active-bg: #38bdf8;
  --pill-active-text: #0f172a;
  --modal-backdrop: rgba(15, 23, 42, 0.65);
}

:root.theme-dark {
  --bg: #0f172a;
  --text: #e5e7eb;
  --muted: #cbd5e1;
  --card-bg: #111827;
  --card-border: #1f2937;
  --border: #1f2937;
  --nav-bg: #0b1221;
  --nav-text: #e5e7eb;
  --nav-link: #cbd5e1;
  --nav-hover-bg: #1d2b45;
  --nav-hover-text: #fff;
  --link: #93c5fd;
  --link-bg: #1d3a74;
  --link-hover-bg: #27457d;
  --btn-primary: #3b82f6;
  --btn-primary-hover: #315fcc;
  --btn-secondary: #14c2a9;
  --btn-secondary-hover: #119c89;
  --danger: #f43f5e;
  --danger-hover: #e11d48;
  --upload-bg: #22c55e;
  --pill-bg: #1f2937;
  --pill-border: #334155;
  --pill-active-bg: #0ea5e9;
  --pill-active-text: #082f49;
  --modal-backdrop: rgba(15, 23, 42, 0.75);
}

* { box-sizing: border-box; }
body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}
nav.topnav {
  display: flex;
  justify-content: center;
  padding: 12px 16px;
  background: var(--nav-bg);
  color: var(--nav-text);
}
nav.topnav .nav-inner {
  width: 100%;
  max-width: 1100px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
nav.topnav .brand {
  font-weight: 700;
  color: var(--nav-text);
  text-decoration: none;
  white-space: nowrap;
}
nav.topnav .nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
nav.topnav .nav-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  overflow-x: auto;
  padding-bottom: 4px;
}
nav.topnav .nav-links a {
  color: var(--nav-link);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 6px;
}
nav.topnav .nav-links a.active,
nav.topnav .nav-links a:hover {
  background: var(--nav-hover-bg);
  color: var(--nav-hover-text);
}
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--nav-text);
  font-weight: 600;
}
.theme-toggle input { position: absolute; opacity: 0; pointer-events: none; }
.theme-toggle .toggle {
  position: relative;
  width: 42px;
  height: 22px;
  background: rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s ease;
  border: 1px solid rgba(255, 255, 255, 0.3);
}
.theme-toggle .toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.25);
  transition: transform 0.2s ease;
}
.theme-toggle input:checked + .toggle {
  background: #22c55e;
  border-color: #16a34a;
}
.theme-toggle input:checked + .toggle::after {
  transform: translateX(20px);
}
.theme-toggle .theme-toggle__text { color: var(--nav-text); }
.theme-toggle--mobile .theme-toggle__text { display: none; }

.mobile-nav-bar {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--nav-bg);
  color: var(--nav-text);
  padding: 12px 16px;
  border-top: 1px solid var(--card-border);
  z-index: 60;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.nav-hamburger {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--nav-text);
  border-radius: 10px;
  padding: 10px 12px;
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  width: 48px;
  height: 48px;
  align-items: center;
  justify-content: center;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 3px;
  border-radius: 999px;
  background: currentColor;
}
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 55;
  align-items: flex-end;
  justify-content: center;
  padding: 12px;
}
.mobile-menu__panel {
  width: min(480px, 100%);
  background: var(--card-bg);
  color: var(--text);
  border-radius: 14px;
  padding: 16px 16px 88px;
  border: 1px solid var(--card-border);
  box-shadow: 0 12px 36px rgba(0,0,0,0.22);
  max-height: calc(100vh - 120px);
  overflow: hidden;
}
.mobile-menu__panel .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--link-bg);
  color: var(--link);
  text-decoration: none;
  font-weight: 700;
  border: 1px solid var(--card-border);
  box-shadow: 0 6px 14px rgba(0,0,0,0.08);
}
.mobile-menu__links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  padding-right: 4px;
  max-height: calc(100vh - 180px);
}
.mobile-menu__links a {
  padding: 12px 14px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--card-border);
  background: var(--bg);
}
.mobile-menu__links a.active {
  background: var(--nav-hover-bg);
  color: var(--nav-hover-text);
  border-color: var(--nav-hover-bg);
}
.mobile-menu.open { display: flex; }
body.mobile-menu-open { overflow: hidden; }
main {
  max-width: 1100px;
  margin: 24px auto;
  padding: 0 16px 48px;
}
header h1 { margin: 0 0 8px; }
header p { margin: 0 0 16px; color: var(--muted); }
.links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 6px 0 12px;
}
.links a {
  color: var(--link);
  text-decoration: none;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: 6px;
  background: var(--link-bg);
}
.links a:hover {
  background: var(--link-hover-bg);
}
.card {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  border: 1px solid var(--card-border);
}
.row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.row.inline { flex-direction: row; align-items: center; gap: 8px; }
.row.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
label { font-weight: 600; font-size: 14px; }
input, select {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  background: var(--card-bg);
  color: var(--text);
}
textarea {
  width: 100%;
  min-height: 96px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  resize: vertical;
  background: var(--card-bg);
  color: var(--text);
}
input[type="checkbox"] { width: auto; padding: 0; }
button {
  padding: 10px 14px;
  border: none;
  border-radius: 8px;
  background: var(--btn-primary);
  color: white;
  cursor: pointer;
  font-weight: 600;
}
button:hover { background: var(--btn-primary-hover); }
.item {
  display: grid;
  grid-template-columns: 2fr 2fr 1fr auto;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}
.item input, .item select { width: 100%; }
.remove {
  background: var(--danger);
}
.remove:hover { background: var(--danger-hover); }
.actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}
.upload {
  display: inline-block;
  padding: 10px 14px;
  background: var(--upload-bg);
  color: white;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
}
.upload input { display: none; }
#status { color: var(--muted); font-size: 14px; }
.radio-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--modal-backdrop);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 50;
}
.modal-backdrop.show { display: flex; }
.modal {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 16px;
  width: min(520px, 100%);
  box-shadow: 0 16px 48px rgba(0,0,0,0.2);
  border: 1px solid var(--card-border);
  color: var(--text);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.modal-body { margin-bottom: 12px; }
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}
.modal-footer .primary {
  background: var(--btn-primary);
  color: #fff;
}
.modal button.close {
  background: transparent;
  color: var(--muted);
}
.s460-card {
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--card-border);
}
.s460-row {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
  flex-wrap: wrap;
}
.s460-list-wrapper { display: flex; flex-direction: column; gap: 12px; }
.s460-inputs { display: flex; flex-direction: column; gap: 10px; }
.s460-inline-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 10px;
  align-items: center;
}
.s460-inline-row input { width: 100%; }
.s460-add { display: flex; justify-content: flex-end; }
.pill-toggle {
  display: inline-flex;
  background: var(--pill-bg);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--pill-border);
}
.pill-toggle .pill {
  background: transparent;
  color: var(--text);
  padding: 8px 12px;
  border: none;
  font-weight: 600;
}
.pill-toggle .pill.active {
  background: var(--pill-active-bg);
  color: var(--pill-active-text);
}
.secondary {
  background: var(--btn-secondary);
}
.secondary:hover {
  background: var(--btn-secondary-hover);
}
@media (max-width: 640px) {
  .item { grid-template-columns: 1fr; }
  .row.grid { grid-template-columns: 1fr; }
}
@media (max-width: 840px) {
  nav.topnav { padding: 12px; }
  nav.topnav .nav-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  nav.topnav .nav-actions {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }
  nav.topnav .nav-links {
    width: 100%;
    justify-content: flex-start;
  }
  nav.topnav .nav-links a {
    padding: 10px 12px;
  }
  .theme-toggle {
    justify-content: space-between;
  }
  .row.inline {
    flex-direction: column;
    align-items: flex-start;
  }
  .links { flex-direction: column; }
  .actions {
    flex-direction: column;
    align-items: stretch;
  }
  .actions button,
  .actions .upload {
    width: 100%;
    text-align: center;
  }
  .s460-inline-row {
    grid-template-columns: 1fr;
  }
  .s460-inline-row .pill-toggle {
    justify-content: flex-start;
  }
  body { padding-bottom: 96px; }
  nav.topnav { display: none; }
  .mobile-nav-bar { display: flex; }
}
@media (min-width: 841px) {
  .mobile-nav-bar, .mobile-menu { display: none !important; }
}