:root {
  --color-primary: #2196f3;
  --color-primary-dark: #1976d2;
  --color-primary-soft: #e3f2fd;
  --color-ink: #14212b;
  --color-muted: #5b6b78;
  --color-border: #d5dde5;
  --color-surface: #ffffff;
  --color-bg: #eef3f7;
  --color-bg-accent: #dce8f2;
  --color-danger: #c62828;
  --shadow-panel: 0 10px 30px rgba(20, 33, 43, 0.08);
  --radius: 12px;
  --font-sans: "Source Sans 3", "Segoe UI", sans-serif;
  --font-display: "Fraunces", "Times New Roman", serif;
  --sidebar-width: 260px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-sans);
  color: var(--color-ink);
  background:
    radial-gradient(circle at top left, rgba(33, 150, 243, 0.14), transparent 40%),
    linear-gradient(180deg, var(--color-bg-accent), var(--color-bg) 40%);
}

body {
  min-height: 100vh;
}

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

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 650;
  letter-spacing: -0.02em;
}

/* —— layout module (app shell / app bar / content) —— */
.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
  transition: grid-template-columns 180ms ease;
}

.app-shell.sidebar-collapsed {
  grid-template-columns: 0 1fr;
}

.app-shell.sidebar-collapsed .sidebar {
  visibility: hidden;
  pointer-events: none;
}

.app-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.app-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-bar-spacer {
  flex: 1;
}

.app-bar-context {
  font-size: 0.95rem;
}

.app-content {
  padding: 1.5rem;
}

.sidebar-backdrop {
  display: none;
}

/* —— sidebar module —— */
.sidebar {
  overflow: hidden;
  border-right: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
}

.sidebar-brand {
  display: grid;
  gap: 0.25rem;
  padding: 1.5rem 1.25rem 1rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 650;
  letter-spacing: -0.02em;
  font-size: 1.5rem;
  color: var(--color-primary);
}

.brand-sub,
.muted,
.eyebrow {
  color: var(--color-muted);
}

.sidebar-nav {
  display: grid;
  gap: 0.35rem;
  padding: 0.5rem 0.85rem 1.5rem;
}

.nav-link {
  display: block;
  padding: 0.7rem 0.85rem;
  border-radius: 10px;
  color: var(--color-ink);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.page {
  max-width: 960px;
}

.hero-page {
  padding: 2rem 0 1rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  margin: 0 0 0.75rem;
}

.lede {
  font-size: 1.15rem;
  line-height: 1.6;
  max-width: 40rem;
  color: var(--color-muted);
}

.cta-row,
.modal-actions,
.user-chip {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.button,
.icon-button {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.65rem 1.1rem;
  font: inherit;
  cursor: pointer;
  background: transparent;
}

.icon-button {
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  border-radius: 10px;
  border-color: var(--color-border);
  background: var(--color-surface);
}

.button-primary {
  background: var(--color-primary);
  color: white;
}

.button-primary:hover {
  background: var(--color-primary-dark);
}

.button-ghost {
  border-color: var(--color-border);
  background: var(--color-surface);
}

.button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.panel,
.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
}

.panel {
  padding: 1.25rem;
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.field {
  display: grid;
  gap: 0.35rem;
  margin: 0.85rem 0;
}

.field-wide {
  max-width: 32rem;
}

.field input {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  font: inherit;
  background: #fff;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(20, 33, 43, 0.45);
  display: grid;
  place-items: center;
  padding: 1rem;
  z-index: 50;
}

.modal {
  width: min(100%, 420px);
  padding: 1.5rem;
}

.form-error {
  color: var(--color-danger);
}

.user-chip {
  padding: 0.25rem 0.35rem 0.25rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
}

.user-chip-name {
  font-weight: 600;
}

.user-chip-role {
  color: var(--color-muted);
  font-size: 0.85rem;
}

.page-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.page-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  gap: 0.75rem;
}

.page-list-item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 1rem 1.1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
}

.page-list-link {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-primary-dark);
}

.page-list-link:hover {
  text-decoration: underline;
}

.wiki-body {
  line-height: 1.65;
  max-width: 46rem;
}

.wiki-rendered pre.wiki-code,
.wiki-content pre.wiki-code {
  overflow-x: auto;
  padding: 0.85rem 1rem;
  background: #f3f6f9;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.92rem;
}

.wiki-rendered code,
.wiki-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}

.wiki-rendered ul,
.wiki-content ul {
  margin: 0 0 1rem 1.2rem;
}

.wiki-rendered p:last-child,
.wiki-content p:last-child {
  margin-bottom: 0;
}

.wiki-math-inline {
  display: inline;
  padding: 0 0.1em;
}

.wiki-math-block {
  display: block;
  margin: 1rem 0;
  overflow-x: auto;
  text-align: center;
}

.wiki-math-block math {
  display: block;
  margin-inline: auto;
}

.wiki-math-error {
  color: var(--color-danger);
  font-size: 0.92em;
}

.field-hint {
  display: block;
  margin-top: 0.4rem;
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.4;
}

.wiki-preview {
  margin: 1rem 0 0;
}

.wiki-preview h3 {
  margin: 0 0 0.65rem;
  font-size: 1rem;
}

.section-stack {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.oauth-row {
  display: grid;
  gap: 0.55rem;
  margin: 0.75rem 0 0.25rem;
}

.oauth-button {
  width: 100%;
  text-align: center;
  justify-content: center;
}

.oauth-google {
  background: #1a73e8;
}

.oauth-github {
  background: #24292f;
}

.oauth-apple {
  background: #111111;
}


.accent-text {
  color: var(--color-primary-dark);
}

@media (max-width: 860px) {
  .app-shell,
  .app-shell.sidebar-collapsed {
    grid-template-columns: 1fr;
  }

  .app-shell.sidebar-collapsed .sidebar {
    visibility: visible;
    pointer-events: auto;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(84vw, var(--sidebar-width));
    transform: translateX(-105%);
    transition: transform 180ms ease;
    z-index: 40;
    visibility: visible;
  }

  .sidebar.open {
    transform: translateX(0);
    pointer-events: auto;
  }

  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    border: 0;
    padding: 0;
    margin: 0;
    background: rgba(20, 33, 43, 0.4);
    z-index: 30;
    cursor: pointer;
  }
}