/* ============================
   SFP Docs - Design System
   ============================ */

:root {
  --sidebar-width: 268px;
  --topbar-height: 52px;

  /* Colors - Dark theme (default) */
  --bg-primary: #0f1117;
  --bg-secondary: #1a1d2e;
  --bg-sidebar: #13151f;
  --bg-content: #0f1117;
  --bg-code: #1a1b2e;
  --bg-card: #1e2235;
  --bg-hover: #252840;

  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-sidebar: #cbd5e1;
  --text-sidebar-active: #7aa2f7;

  --accent-blue: #7aa2f7;
  --accent-green: #9ece6a;
  --accent-orange: #ff9e64;
  --accent-red: #f7768e;
  --accent-yellow: #e0af68;
  --accent-purple: #bb9af7;

  --border-color: #2d3254;
  --border-sidebar: #1e2235;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --transition: 0.2s ease;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

/* Light theme */
body.light-theme {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-sidebar: #f1f5f9;
  --bg-content: #ffffff;
  --bg-code: #1e293b;
  --bg-card: #f8fafc;
  --bg-hover: #e2e8f0;

  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-sidebar: #334155;
  --text-sidebar-active: #2563eb;

  --accent-blue: #2563eb;
  --border-color: #e2e8f0;
  --border-sidebar: #e2e8f0;
}

/* ============================
   Reset & Base
   ============================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  display: flex;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ============================
   Sidebar
   ============================ */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-sidebar);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 100;
  transition: transform var(--transition);
}

.sidebar-header {
  padding: 20px 16px 12px;
  border-bottom: 1px solid var(--border-sidebar);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 16px;
}

.logo-icon {
  font-size: 22px;
  color: var(--accent-blue);
  line-height: 1;
}

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

.version-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-blue);
  background: rgba(122, 162, 247, 0.12);
  border: 1px solid rgba(122, 162, 247, 0.25);
  padding: 2px 7px;
  border-radius: 20px;
  letter-spacing: 0.5px;
}

/* Search */
.search-box {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-sidebar);
  position: relative;
  flex-shrink: 0;
}

.search-box input {
  width: 100%;
  padding: 7px 32px 7px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color var(--transition);
}

.search-box input:focus {
  border-color: var(--accent-blue);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-icon {
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 13px;
  color: var(--text-muted);
  pointer-events: none;
}

/* Navigation */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

.sidebar-nav::-webkit-scrollbar {
  width: 4px;
}

.sidebar-nav::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar-nav::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 2px;
}

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

.nav-section-title {
  width: 100%;
  padding: 8px 12px 8px 14px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  text-align: left;
  transition: color var(--transition);
}

.nav-section-title:hover {
  color: var(--text-primary);
}

.section-arrow {
  font-size: 10px;
  transition: transform var(--transition);
  width: 12px;
  display: inline-block;
}

.nav-section-title.open .section-arrow {
  transform: rotate(0deg);
}

.nav-section-title:not(.open) .section-arrow {
  transform: rotate(-90deg);
}

.nav-items {
  list-style: none;
  padding: 0 8px 4px;
}

.nav-items li a {
  display: block;
  padding: 6px 12px 6px 28px;
  color: var(--text-sidebar);
  text-decoration: none;
  font-size: 13.5px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
}

.nav-items li a:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.nav-items li a.active {
  background: rgba(122, 162, 247, 0.12);
  color: var(--text-sidebar-active);
  font-weight: 500;
}

.nav-items li a.active::before {
  content: '';
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 16px;
  background: var(--accent-blue);
  border-radius: 2px;
}

/* Sidebar footer */
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-sidebar);
  flex-shrink: 0;
}

.lang-switcher {
  display: flex;
  gap: 4px;
}

.lang-btn {
  padding: 5px 12px;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.5px;
}

.lang-btn.active,
.lang-btn:hover {
  background: rgba(122, 162, 247, 0.12);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

/* ============================
   Main wrapper
   ============================ */

.main-wrapper {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================
   Topbar
   ============================ */

.topbar {
  position: sticky;
  top: 0;
  height: var(--topbar-height);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  z-index: 50;
}

.breadcrumb {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb .sep {
  color: var(--border-color);
}

.breadcrumb .current {
  color: var(--text-secondary);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 6px 8px;
  cursor: pointer;
  font-size: 14px;
  transition: all var(--transition);
  color: var(--text-muted);
}

.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* ============================
   Content
   ============================ */

.content {
  flex: 1;
  padding: 40px 48px 60px;
  max-width: 860px;
  width: 100%;
}

/* Loading states */
.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 0;
  color: var(--text-muted);
  gap: 16px;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.content.loading::after {
  content: '';
  position: fixed;
  top: 0;
  left: var(--sidebar-width);
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
  animation: loadbar 0.8s ease;
}

@keyframes loadbar {
  from { transform: scaleX(0); transform-origin: left; }
  to { transform: scaleX(1); transform-origin: left; }
}

/* ============================
   Typography (content area)
   ============================ */

.content h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.2;
  letter-spacing: -0.5px;
}

.content h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 40px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 28px 0 10px;
}

.content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 20px 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.content p {
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.content ul, .content ol {
  color: var(--text-secondary);
  padding-left: 24px;
  margin-bottom: 14px;
}

.content li {
  margin-bottom: 6px;
}

.content hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 36px 0;
}

.content a {
  color: var(--accent-blue);
  text-decoration: none;
}

.content a:hover {
  text-decoration: underline;
}

/* Inline code */
.content code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--accent-orange);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
}

/* Code blocks */
.content pre {
  margin: 16px 0 24px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.content pre code.hljs {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  padding: 20px 22px;
}

/* Code block header */
.code-block {
  position: relative;
}

.code-lang {
  position: absolute;
  top: 0;
  right: 0;
  background: rgba(255,255,255,0.05);
  color: var(--text-muted);
  font-size: 11px;
  font-family: var(--font-mono);
  padding: 4px 10px;
  border-bottom-left-radius: var(--radius-sm);
  letter-spacing: 0.5px;
}

/* Tables */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 13.5px;
}

.content th {
  background: var(--bg-card);
  color: var(--text-primary);
  font-weight: 600;
  text-align: left;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.content td {
  padding: 9px 14px;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  vertical-align: top;
}

.content tr:hover td {
  background: var(--bg-card);
}

/* Callout boxes */
.callout {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  margin: 20px 0;
  border-left: 4px solid;
  font-size: 14px;
}

.callout.info {
  background: rgba(122, 162, 247, 0.08);
  border-color: var(--accent-blue);
  color: var(--text-secondary);
}

.callout.warning {
  background: rgba(224, 175, 104, 0.08);
  border-color: var(--accent-yellow);
  color: var(--text-secondary);
}

.callout.danger {
  background: rgba(247, 118, 142, 0.08);
  border-color: var(--accent-red);
  color: var(--text-secondary);
}

.callout.success {
  background: rgba(158, 206, 106, 0.08);
  border-color: var(--accent-green);
  color: var(--text-secondary);
}

.callout-icon {
  font-size: 16px;
  flex-shrink: 0;
  margin-top: 1px;
}

.callout p {
  margin: 0;
  color: inherit;
}

/* Badge (attribute types) */
.badge {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  font-family: var(--font-mono);
  border: 1px solid;
}

.badge.required {
  color: var(--accent-red);
  border-color: rgba(247, 118, 142, 0.3);
  background: rgba(247, 118, 142, 0.08);
}

.badge.optional {
  color: var(--text-muted);
  border-color: var(--border-color);
  background: var(--bg-card);
}

.badge.type {
  color: var(--accent-purple);
  border-color: rgba(187, 154, 247, 0.3);
  background: rgba(187, 154, 247, 0.08);
}

/* Page intro */
.page-intro {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 32px;
}

.page-intro p {
  margin: 0;
  font-size: 15px;
}

/* Attribute grid */
.attr-grid {
  display: grid;
  gap: 1px;
  background: var(--border-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 16px 0 24px;
}

.attr-row {
  display: grid;
  grid-template-columns: 180px 100px 1fr;
  background: var(--bg-primary);
  gap: 0;
}

.attr-row.header {
  background: var(--bg-card);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.attr-cell {
  padding: 9px 14px;
  font-size: 13.5px;
}

.attr-row:not(.header):hover {
  background: var(--bg-card);
}

/* ============================
   Page Navigation
   ============================ */

.page-nav {
  display: flex;
  justify-content: space-between;
  padding: 24px 48px 40px;
  border-top: 1px solid var(--border-color);
  gap: 16px;
}

.page-nav-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 14px;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 140px;
}

.page-nav-btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.page-nav-btn.next {
  margin-left: auto;
  justify-content: flex-end;
}

/* ============================
   Mobile header
   ============================ */

.mobile-header {
  display: none;
}

.hamburger {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 99;
}

/* ============================
   Responsive
   ============================ */

@media (max-width: 768px) {
  .mobile-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-sidebar);
    border-bottom: 1px solid var(--border-sidebar);
    position: sticky;
    top: 0;
    z-index: 200;
  }

  .mobile-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    color: var(--text-primary);
  }

  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay.active {
    display: block;
  }

  .main-wrapper {
    margin-left: 0;
  }

  .content {
    padding: 24px 20px 40px;
  }

  .page-nav {
    padding: 20px 20px 32px;
  }

  .topbar {
    display: none;
  }

  .content table {
    font-size: 12px;
  }

  .content th,
  .content td {
    padding: 7px 10px;
  }
}

/* ============================
   Search results
   ============================ */

.search-results {
  position: absolute;
  top: 100%;
  left: 12px;
  right: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 200;
  max-height: 300px;
  overflow-y: auto;
}

.search-result-item {
  padding: 10px 14px;
  cursor: pointer;
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition);
}

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

.search-result-item:hover {
  background: var(--bg-hover);
}

.search-result-title {
  font-size: 13.5px;
  color: var(--text-primary);
  font-weight: 500;
}

.search-result-section {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ============================
   Content transitions
   ============================ */

.content-fade-in {
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================
   Step boxes (tutorial steps)
   ============================ */

.step-box {
  margin: 20px 0 28px;
}

.step {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.step-number {
  width: 30px;
  height: 30px;
  background: var(--accent-blue);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
  margin-top: 1px;
}

.step-content {
  flex: 1;
}

.step-content p {
  margin: 0 0 8px;
  color: var(--text-secondary);
}

.step-content pre {
  margin: 8px 0 0;
}

/* ============================
   Copy button on code blocks
   ============================ */

.content pre {
  position: relative;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 11px;
  padding: 3px 10px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: system-ui, sans-serif;
  z-index: 10;
  letter-spacing: 0.3px;
}

.copy-btn:hover {
  background: rgba(255,255,255,0.15);
  color: var(--text-primary);
}

.copy-btn.copied {
  color: var(--accent-green);
  border-color: rgba(158,206,106,0.4);
  background: rgba(158,206,106,0.08);
}

/* Light theme copy button */
body.light-theme .copy-btn {
  background: rgba(0,0,0,0.05);
  border-color: rgba(0,0,0,0.1);
}

body.light-theme .copy-btn:hover {
  background: rgba(0,0,0,0.1);
}

/* ============================
   Step number badge in sidebar
   ============================ */

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 17px;
  height: 17px;
  background: var(--accent-blue);
  color: white;
  border-radius: 50%;
  font-size: 9px;
  font-weight: 800;
  margin-right: 5px;
  flex-shrink: 0;
  vertical-align: middle;
}

/* ============================
   Keyboard shortcut badges
   ============================ */

kbd {
  display: inline-block;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-bottom-width: 2px;
  border-radius: 4px;
  color: var(--text-secondary);
}

/* ============================
   Control type cards
   ============================ */

.control-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  margin: 16px 0 24px;
}

.control-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  transition: border-color var(--transition);
}

.control-card:hover {
  border-color: var(--accent-blue);
}

.control-card-name {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent-blue);
  font-weight: 600;
  margin-bottom: 4px;
}

.control-card-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* ============================
   Highlighted XML diff additions
   ============================ */

.xml-add {
  background: rgba(158, 206, 106, 0.1);
  display: block;
  border-left: 3px solid var(--accent-green);
  margin-left: -22px;
  padding-left: 19px;
}

/* ============================
   Section divider with number
   ============================ */

.section-step {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 36px 0 14px;
}

.section-step-num {
  width: 28px;
  height: 28px;
  background: var(--accent-blue);
  color: white;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}

.section-step h2 {
  margin: 0;
  padding: 0;
  border: none;
  font-size: 1.2rem;
}