:root {
  color-scheme: light dark;
  --color-bg: #f6f7fb;
  --color-surface: #ffffff;
  --color-border: #e0e5f0;
  --color-border-strong: #c6cede;
  --color-text: #0f172a;
  --color-muted: #5f6b84;
  --color-accent: #2563eb;
  --color-accent-soft: #e0e7ff;
  --color-inspector-bg: #101828;
  font-family: "Lexend", "Inter", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.45;
  font-size: 16px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1115;
    --color-surface: #151823;
    --color-border: #262a36;
    --color-border-strong: #3a4054;
    --color-text: #e8e8e8;
    --color-muted: #a8a8a8;
    --color-accent: #7da2ff;
    --color-accent-soft: rgba(125, 162, 255, 0.18);
    --color-inspector-bg: #0b1220;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  min-height: 100vh;
  overflow: hidden;
  background: var(--color-bg);
  color: var(--color-text);
  display: flex;
}

a {
  color: inherit;
  text-decoration: none;
}

code {
  font-family: "JetBrains Mono", "Fira Code", "SFMono-Regular", Menlo, monospace;
  font-size: 0.82em;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-accent);
  padding: 0.1rem 0.35rem;
  border-radius: 0.45rem;
}

.app-shell {
  flex: 1;
  min-height: 0;
  height: 100vh;
  width: 100%;
  display: flex;
  overflow: hidden;
  background: radial-gradient(circle at top right, rgba(226, 232, 255, 0.5), transparent 45%), var(--color-bg);
}

.sidebar {
  width: 280px;
  max-width: 360px;
  min-width: 220px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  z-index: 1;
  overflow: hidden;
  height: 100%;
}

.sidebar .brand {
  padding: 1.4rem 1.75rem 1.2rem;
  border-bottom: 1px solid var(--color-border);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.brand .dot {
  display: inline-flex;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 999px;
  background: var(--color-accent);
  box-shadow: 0 0 0 6px rgba(37, 99, 235, 0.16);
}

.nav-content {
  flex: 1;
  padding: 1.2rem 1rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  overflow-y: auto;
  min-height: 0;
}

.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 1rem;
  border-radius: 0.9rem;
  font-size: 0.93rem;
  color: var(--color-muted);
  transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.nav-item span {
  flex: 1;
}

.nav-item .hint {
  font-size: 0.75rem;
  color: var(--color-muted);
  opacity: 0.8;
}

.nav-item:hover {
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-accent);
}

.nav-item.active {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-weight: 600;
}

.sidebar-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.2rem 1.75rem;
  font-size: 0.82rem;
  color: var(--color-muted);
  margin-top: auto;
}

.sidebar-footer strong {
  color: var(--color-text);
  font-weight: 600;
}

.main-region {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  height: 100%;
}

.main-header {
  padding: 1.6rem 2.25rem 1.4rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

/* index header: collapsible banner (details/summary) */
.main-header details {
  margin: 0;
}

.main-header summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  list-style: none;
  cursor: pointer;
}

/* hide default marker */
.main-header summary::-webkit-details-marker { display: none; }
.main-header summary::marker { content: ""; }

.main-header .chevron {
  font-size: 1rem;
  line-height: 1;
  transform: rotate(0deg);
  transition: transform 0.18s ease;
  opacity: 0.7;
}

.main-header details:not([open]) .chevron {
  transform: rotate(-90deg);
}

.main-header .banner-content {
  margin-top: 0.25rem;
}

.main-header h1 {
  margin: 0;
  font-size: 1.65rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.main-header p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.96rem;
  max-width: 60ch;
}

.badge-row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 0.85rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 600;
}

.content-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1.75rem 2.25rem 2.25rem;
  gap: 1.5rem;
  min-height: 0;
  overflow: hidden;
}

.split-vertical {
  flex: 1;
  min-height: 0;
  display: grid;
  gap: 1.5rem;
  grid-template-rows: minmax(230px, 1fr) minmax(260px, 1fr);
}

.panel {
  background: var(--color-surface);
  border-radius: 1.3rem;
  border: 1px solid var(--color-border);
  box-shadow: 0 18px 36px rgba(15, 23, 42, 0.08);
  display: flex;
  flex-direction: column;
  min-height: 0;
  position: relative;
}

.panel-header {
  padding: 1.15rem 1.6rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.panel-header h2 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.panel-header .subtitle {
  font-size: 0.82rem;
  color: var(--color-muted);
}

.panel-body {
  flex: 1;
  padding: 1.35rem 1.6rem 1.6rem;
  overflow: auto;
  min-height: 0;
}

.panel-body::-webkit-scrollbar {
  width: 10px;
}

.panel-body::-webkit-scrollbar-thumb {
  background: rgba(15, 23, 42, 0.18);
  border-radius: 999px;
}

.panel-body::-webkit-scrollbar-track {
  background: transparent;
}

.detail-grid {
  display: flex;
  gap: 1.6rem;
  align-items: flex-start;
  min-height: 0;
  height: 100%;
}

.detail-grid > * {
  flex: 1;
  min-width: 0;
}

.detail-grid pan-form {
  display: block;
}

.detail-grid pan-inspector {
  display: block;
  height: 100%;
  min-height: 280px;
  border-radius: 1rem;
}

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

.button-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.85rem;
  background: rgba(15, 23, 42, 0.06);
  border-radius: 0.75rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text);
  transition: background 0.18s ease, color 0.18s ease;
}

.button-link:hover {
  background: rgba(37, 99, 235, 0.16);
  color: var(--color-accent);
}

.meta-label {
  font-size: 0.9rem;
  color: var(--color-muted);
}

.meta-value {
  font-size: 0.9rem;
  font-weight: 600;
}

.panel-body pan-data-table {
  display: block;
}

pan-inspector {
  background: var(--color-inspector-bg);
  border-radius: 1rem;
  overflow: hidden;
}

.viewer-panel {
  height: 100%;
  min-height: 0;
}

.viewer-body {
  padding: 0;
}

.viewer-body pan-demo-viewer {
  display: block;
  width: 100%;
  height: 100%;
}

@media (max-width: 1100px) {
  body {
    overflow: auto;
    height: auto;
    min-height: 0;
  }

  .app-shell {
    flex-direction: column;
    height: auto;
  }

  .sidebar {
    width: 100%;
    height: auto;
    min-height: auto;
    max-width: none;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    flex-direction: row;
    align-items: center;
    padding: 0.75rem 1rem;
    gap: 1rem;
    overflow: visible;
  }

  .sidebar .brand {
    padding: 0;
    border: none;
    margin-right: auto;
  }

  .nav-content {
    flex-direction: row;
    flex-wrap: wrap;
    padding: 0;
    gap: 0.35rem;
    overflow-x: auto;
  }

  .nav-item {
    border-radius: 999px;
    padding: 0.55rem 0.95rem;
  }

  .nav-item .hint {
    display: none;
  }

  .sidebar-footer {
    display: none;
  }

  .content-area {
    padding: 1.4rem 1.5rem 1.8rem;
  }
}

@media (max-width: 920px) {
  .split-vertical {
    grid-template-rows: auto auto;
  }

  .panel-body {
    padding: 1.1rem 1.3rem 1.3rem;
  }

  .detail-grid {
    flex-direction: column;
  }

  .detail-grid pan-inspector {
    min-height: 240px;
  }
}

@media (max-width: 680px) {
  :root {
    font-size: 15px;
  }

  body {
    background: var(--color-surface);
  }

  .main-header {
    padding: 1.25rem 1.35rem 1.1rem;
  }

  .content-area {
    padding: 1.1rem 1.25rem 1.5rem;
    gap: 1.1rem;
  }

  .split-vertical {
    gap: 1.1rem;
  }
}