/* APEX Documentation — Professional Red-and-White Identity */

:root {
  --bg-color: #FFFFFF;
  --text-main: #202020;
  --text-muted: #666666;
  --accent-red: #C62828;
  --accent-red-hover: #A51D24;
  --accent-red-light: #FFEBEE;
  --border-color: #E5E5E5;
  --code-bg: #F5F5F5;
  --sidebar-bg: #FAFAFA;
  --card-bg: #FFFFFF;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sidebar-width: 270px;
  --header-height: 60px;
  --content-max-width: 860px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-color);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ── Top Mobile Bar ──────────────────────────────────────────────────────── */

.mobile-header {
  display: none;
  height: var(--header-height);
  background: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
  padding: 0 1.25rem;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.mobile-logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-main);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mobile-logo span {
  color: var(--accent-red);
}

.menu-toggle-btn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 6px 10px;
  font-size: 1.1rem;
  color: var(--text-main);
  cursor: pointer;
}

/* ── Main Layout Container ───────────────────────────────────────────────── */

.layout {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar Navigation ─────────────────────────────────────────────────── */

.sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  padding: 1.5rem 1.25rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 90;
}

.brand {
  margin-bottom: 1.5rem;
}

.brand-link {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  letter-spacing: -0.02em;
}

.brand-link .logo-mark {
  color: var(--accent-red);
}

.brand-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
  line-height: 1.3;
}

/* Search Box */
.search-wrapper {
  position: relative;
  margin-bottom: 1.5rem;
}

.search-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-main);
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  outline: none;
  transition: border-color 0.15s ease;
}

.search-input:focus {
  border-color: var(--accent-red);
  box-shadow: 0 0 0 2px var(--accent-red-light);
}

.search-results {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  max-height: 320px;
  overflow-y: auto;
  z-index: 200;
}

.search-results.active {
  display: block;
}

.search-item {
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--border-color);
  text-decoration: none;
  display: block;
  color: var(--text-main);
  transition: background 0.1s;
}

.search-item:last-child {
  border-bottom: none;
}

.search-item:hover, .search-item.selected {
  background: var(--accent-red-light);
}

.search-item-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-red);
}

.search-item-snippet {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
  line-height: 1.3;
}

.search-empty {
  padding: 0.8rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
}

/* Nav Menu */
.nav-group-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.nav-list {
  list-style: none;
  margin-bottom: 1.5rem;
}

.nav-item {
  margin-bottom: 2px;
}

.nav-link {
  display: block;
  padding: 0.45rem 0.65rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 4px;
  font-weight: 500;
  transition: all 0.15s ease;
}

.nav-link:hover {
  color: var(--text-main);
  background: #F0F0F0;
}

.nav-link.active {
  color: var(--accent-red);
  background: var(--accent-red-light);
  font-weight: 600;
}

.sidebar-footer {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
}

.sidebar-footer a {
  color: var(--text-muted);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
}

.sidebar-footer a:hover {
  color: var(--accent-red);
}

/* ── Content Area ────────────────────────────────────────────────────────── */

.main-content {
  flex: 1;
  padding: 2.5rem 3.5rem 4rem 3.5rem;
  max-width: calc(var(--content-max-width) + 7rem);
}

.content-wrapper {
  max-width: var(--content-max-width);
}

/* Typography Hierarchy */
h1 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.025em;
  margin-bottom: 0.75rem;
  line-height: 1.25;
}

.page-intro {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.6;
}

h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.015em;
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1.25rem;
}

a {
  color: var(--accent-red);
  text-decoration: none;
  font-weight: 500;
}

a:hover {
  color: var(--accent-red-hover);
  text-decoration: underline;
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.4rem;
}

/* Code & Syntax */
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.15rem 0.35rem;
  border-radius: 3px;
  border: 1px solid var(--border-color);
  color: #1A1A1A;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1.25rem 0 1.5rem 0;
  position: relative;
}

pre code {
  background: transparent;
  padding: 0;
  border: none;
  font-size: 0.88rem;
  color: #1A1A1A;
  line-height: 1.55;
  display: block;
}

/* Copy Button on Code Blocks */
.code-block-wrapper {
  position: relative;
}

.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 3px 8px;
  font-size: 0.72rem;
  font-family: var(--font-sans);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.copy-btn:hover {
  color: var(--accent-red);
  border-color: var(--accent-red);
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

th {
  background: var(--sidebar-bg);
  color: var(--text-main);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--border-color);
  border-top: 1px solid var(--border-color);
}

td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}

tr:hover td {
  background: #FAFAFA;
}

/* Callouts / Alerts */
.callout {
  background: #FAFAFA;
  border-left: 4px solid var(--accent-red);
  border-radius: 0 4px 4px 0;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.callout p:last-child {
  margin-bottom: 0;
}

.callout-title {
  font-weight: 700;
  color: var(--accent-red);
  margin-bottom: 0.35rem;
  display: block;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.1rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 4px;
  text-decoration: none !important;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-primary {
  background: var(--accent-red);
  color: #FFFFFF !important;
  border: 1px solid var(--accent-red);
}

.btn-primary:hover {
  background: var(--accent-red-hover);
  border-color: var(--accent-red-hover);
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--text-main) !important;
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--text-muted);
  background: #FAFAFA;
}

/* Badges */
.badge {
  display: inline-block;
  padding: 2px 7px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 3px;
  border: 1px solid transparent;
}

.badge-red {
  background: var(--accent-red-light);
  color: var(--accent-red);
  border-color: #FFCDD2;
}

.badge-grey {
  background: #EEEEEE;
  color: var(--text-muted);
}

/* Page Navigation (Prev / Next) */
.page-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  gap: 1rem;
}

.page-nav-link {
  display: flex;
  flex-direction: column;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  text-decoration: none;
  min-width: 180px;
  transition: border-color 0.15s ease;
}

.page-nav-link:hover {
  border-color: var(--accent-red);
}

.page-nav-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.page-nav-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-red);
  margin-top: 2px;
}

.page-nav-next {
  text-align: right;
  margin-left: auto;
}

/* ── Mobile Responsive ───────────────────────────────────────────────────── */

@media (max-width: 860px) {
  .mobile-header {
    display: flex;
  }

  .sidebar {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 280px;
    height: calc(100vh - var(--header-height));
    transition: left 0.25s ease;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
  }

  .sidebar.open {
    left: 0;
  }

  .main-content {
    padding: 2rem 1.25rem 3rem 1.25rem;
  }

  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.3rem;
  }

  .page-nav {
    flex-direction: column;
  }

  .page-nav-next {
    text-align: left;
    margin-left: 0;
  }
}