/* ==========================================================================
   TRUJILLO ENGINEERING GUIDES & RESEARCH HUB - UNIFIED DESIGN SYSTEM
   Full Zero-Clash Adaptive Theme (OLED Dark & Studio Light)
   ========================================================================== */

:root,
[data-theme="dark"] {
  --bg: #080c14;
  --bg-card: rgba(15, 22, 36, 0.78);
  --bg-card-hover: rgba(22, 32, 52, 0.9);
  --bg-card-subtle: rgba(13, 19, 33, 0.7);
  --bg-code: #0c1220;
  --border: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(255, 255, 255, 0.05);
  --border-focus: rgba(0, 120, 212, 0.45);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-pill: #0078d4;
  --accent-pill-text: #ffffff;
  --header-bg: rgba(8, 12, 20, 0.85);
  --header-border: rgba(255, 255, 255, 0.08);
  --shadow-dropdown: 0 16px 32px rgba(0, 0, 0, 0.7);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Cascadia Code', 'Consolas', 'JetBrains Mono', ui-monospace, monospace;
  --header-height: 64px;
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-card-subtle: #f8fafc;
  --bg-code: #f1f5f9;
  --border: #e2e8f0;
  --border-subtle: #edf2f7;
  --border-focus: #94a3b8;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --accent-pill: #0f172a;
  --accent-pill-text: #ffffff;
  --header-bg: rgba(255, 255, 255, 0.92);
  --header-border: #e2e8f0;
  --shadow-dropdown: 0 16px 32px rgba(0, 0, 0, 0.08);
}

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

:focus-visible {
  outline: 2px solid var(--accent-pill);
  outline-offset: 2px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color 0.2s ease, color 0.2s ease;
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(circle at 50% 15%, rgba(0, 120, 212, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 85% 75%, rgba(16, 124, 65, 0.05) 0%, transparent 45%),
    radial-gradient(circle at 15% 85%, rgba(56, 189, 248, 0.05) 0%, transparent 45%);
}

[data-theme="light"] body {
  background-image: radial-gradient(circle at 50% 0%, rgba(0, 0, 0, 0.02) 0%, transparent 60%);
}

/* Hide Google Translate top bar */
.goog-te-banner-frame.skiptranslate,
body > .skiptranslate,
#goog-gt-tt {
  display: none !important;
}
body { top: 0px !important; }
.goog-te-gadget { display: none !important; }

/* Progress bar */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2.5px;
  background: var(--accent-pill);
  width: 0%;
  z-index: 1000;
  transition: width 0.1s ease;
}

/* Site Header */
header.site-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 100;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.header-logo {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border);
}

.brand-title {
  font-size: 13.5px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--text-primary);
  text-transform: uppercase;
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  border-left: 1px solid var(--border);
  padding-left: 12px;
}

/* Navigation Tabs */
.nav-tabs {
  display: flex;
  align-items: center;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 9999px;
  padding: 3px;
  gap: 2px;
}

.nav-tab-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.nav-tab-btn:hover:not(.active) {
  color: var(--text-primary);
}

.nav-tab-btn.active {
  background: var(--accent-pill);
  color: var(--accent-pill-text);
  font-weight: 600;
}

/* Header Right Controls */
.header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 10px;
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 12px;
  padding: 6px 12px 6px 32px;
  border-radius: 8px;
  width: 210px;
  transition: all 0.2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--border-focus);
  width: 250px;
}

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

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }

/* Language Dropdown */
.lang-dropdown-wrapper {
  position: relative;
}

.lang-dropdown-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.lang-dropdown-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px;
  min-width: 170px;
  box-shadow: var(--shadow-dropdown);
  display: none;
  flex-direction: column;
  gap: 2px;
  z-index: 200;
}

.lang-menu.show {
  display: flex;
}

.lang-menu-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background: transparent;
  border: none;
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.lang-menu-item:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.lang-menu-item.active {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  font-weight: 600;
}

.lang-menu-badge {
  font-size: 9.5px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--border);
  color: var(--text-muted);
}

/* Container & Layout */
.container {
  display: flex;
  max-width: 1400px;
  margin: 0 auto;
  padding: 32px 24px;
  gap: 40px;
  flex: 1;
}

/* Sidebar TOC */
aside.sidebar {
  width: 280px;
  flex-shrink: 0;
  position: sticky;
  top: 96px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

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

aside.sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.sidebar-card {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 24px;
}

.sidebar-author-img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  margin-bottom: 10px;
}

.sidebar-author-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.sidebar-author-role {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.sidebar-author-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11.5px;
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
  transition: all 0.15s ease;
}

.sidebar-author-link:hover {
  color: var(--text-primary);
  border-bottom-color: var(--text-primary);
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.toc-link {
  display: block;
  padding: 6px 10px;
  font-size: 12.5px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 6px;
  border-left: 2px solid transparent;
  transition: all 0.15s ease;
}

.toc-link:hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.toc-link.active {
  color: var(--text-primary);
  background: var(--bg-card-hover);
  border-left-color: var(--accent-pill);
  font-weight: 600;
}

/* Main Content Area */
main {
  flex: 1;
  min-width: 0;
}

.tab-view {
  display: none;
}

.tab-view.active {
  display: block;
}

/* Category Filter Bar */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.filter-chip {
  padding: 6px 14px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.filter-chip:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.filter-chip.active {
  background: var(--accent-pill);
  color: var(--accent-pill-text);
  border-color: var(--accent-pill);
  font-weight: 600;
}

/* Catalog Grid */
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.catalog-card,
.research-card,
.ecosystem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.2s ease;
}

.catalog-card:hover,
.research-card:hover,
.ecosystem-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.catalog-card.active-guide {
  border-color: rgba(34, 197, 94, 0.4);
}

.catalog-status-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.status-live {
  background: rgba(34, 197, 94, 0.12);
  color: #10b981;
  border: 1px solid rgba(34, 197, 94, 0.3);
}

.status-research {
  background: rgba(56, 189, 248, 0.12);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.catalog-title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.35;
}

.catalog-desc {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 16px;
  flex: 1;
}

.catalog-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.catalog-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--accent-pill);
  color: var(--accent-pill-text);
  border: none;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.15s ease;
}

.catalog-action-btn:hover {
  opacity: 0.9;
}

/* Guide Article Typography & Structure */
.guide-content {
  margin-top: 24px;
}

.hero-category {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 9999px;
  margin-bottom: 16px;
}

.hero-category .pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
}

h1.guide-title {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 12px;
}

.guide-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.guide-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 36px;
}

.meta-author {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.meta-item {
  font-size: 12.5px;
  color: var(--text-muted);
}

.guide-content section {
  margin-bottom: 48px;
  scroll-margin-top: 90px;
}

.guide-content h2 {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.guide-content h3 {
  font-size: 16.5px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 20px 0 10px;
}

.guide-content p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.guide-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.guide-content ul,
.guide-content ol {
  margin-left: 20px;
  margin-bottom: 16px;
  color: var(--text-secondary);
  font-size: 14.5px;
  line-height: 1.7;
}

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

/* Visual Components: Callouts, Tables, Code, Flow */
.callout {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-left: 3px solid var(--text-primary);
  border-radius: 8px;
  padding: 16px;
  margin: 20px 0;
}

.callout.tip {
  border-left-color: #0284c7;
}

.callout-title {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.callout p {
  margin-bottom: 0;
  font-size: 13.5px;
}

.code-container {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 20px 0;
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: var(--bg-card-subtle);
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-muted);
}

.copy-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: 5px;
  font-size: 11px;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all 0.15s ease;
}

.copy-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.copy-btn.copied {
  color: #22c55e;
  border-color: #22c55e;
}

pre {
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-primary);
}

code {
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 2px 6px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: var(--text-primary);
}

pre code {
  padding: 0;
  background: transparent;
  border: none;
  border-radius: 0;
  color: inherit;
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 24px 0;
  border-radius: 8px;
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

th {
  text-align: left;
  padding: 12px 16px;
  background: var(--bg-card-subtle);
  color: var(--text-primary);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--border);
}

td {
  padding: 12px 16px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

tr:last-child td {
  border-bottom: none;
}

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

/* KPI Cards */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  transition: all 0.15s ease;
}

.kpi-card:hover {
  border-color: var(--border-focus);
}

.kpi-metric {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.kpi-label {
  font-size: 12px;
  color: var(--text-muted);
}

/* Pipeline Flow Visuals */
.pipeline-flow-container {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin: 24px 0;
}

.pipeline-flow-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.pipeline-flow-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
}

.pipeline-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.pipeline-step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
}

.pipeline-step-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.pipeline-step-name {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.pipeline-step-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.45;
}

.pipeline-tech-tag {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
}

/* DNS Record Cards */
.dns-records-grid {
  display: grid;
  gap: 14px;
  margin: 20px 0;
}

.dns-record-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
}

.dns-record-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-subtle);
}

.dns-record-name {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
}

.dns-record-value {
  font-family: var(--font-mono);
  font-size: 12px;
  color: #0284c7;
  background: var(--bg-code);
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 6px;
  word-break: break-all;
}

[data-theme="dark"] .dns-record-value {
  color: #38bdf8;
}

/* Step Items */
.stepper-container {
  display: grid;
  gap: 12px;
  margin: 20px 0;
}

.step-item {
  display: flex;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.step-number {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-pill);
  color: var(--accent-pill-text);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-body h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.step-body p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* Email Mockup Component */
.email-mockup-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  max-width: 520px;
  margin: 24px auto;
  padding: 32px 24px;
  text-align: center;
}

.email-mockup-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.email-mockup-sub {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 20px;
}

.email-code-box {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px 20px;
  max-width: 300px;
  margin: 0 auto 20px;
}

.email-code-val {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 10px;
  text-indent: 10px;
}

.email-cta-btn {
  display: inline-block;
  padding: 10px 24px;
  background: var(--accent-pill);
  color: var(--accent-pill-text);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
  border-radius: 9999px;
  transition: opacity 0.15s ease;
}

.email-cta-btn:hover {
  opacity: 0.9;
}

.email-footer-note {
  border-top: 1px solid var(--border-subtle);
  margin-top: 24px;
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-muted);
}

/* Interactive Components: Calculator, Simulator, Checklist */
.savings-calc-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 28px 0;
}

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

.calc-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
}

.calc-badge {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 9999px;
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #10b981;
}

.calc-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

@media (max-width: 640px) {
  .calc-controls { grid-template-columns: 1fr; }
}

.calc-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.calc-val-highlight {
  color: var(--text-primary);
  font-weight: 700;
  font-family: var(--font-mono);
}

.calc-slider {
  width: 100%;
  accent-color: var(--accent-pill);
  cursor: pointer;
}

.calc-plan-selector {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.calc-plan-btn {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.calc-plan-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.calc-plan-btn.active {
  background: var(--accent-pill);
  color: var(--accent-pill-text);
  border-color: var(--accent-pill);
  font-weight: 700;
}

.calc-results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
}

@media (max-width: 640px) {
  .calc-results-grid { grid-template-columns: 1fr; }
}

.calc-result-card {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  text-align: center;
}

.calc-result-card.savings {
  border-color: rgba(34, 197, 94, 0.4);
}

.calc-result-metric {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.calc-result-card.savings .calc-result-metric {
  color: #10b981;
}

.calc-result-label {
  font-size: 11.5px;
  color: var(--text-muted);
}

/* Interactive Simulator */
.interactive-simulator {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 28px 0;
}

.sim-title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.sim-card {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 12px;
}

.sim-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.sim-card-type {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
}

.sim-status-pill {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 9999px;
  background: var(--border);
  color: var(--text-muted);
}

.sim-output-box {
  background: var(--bg-code);
  border: 1px solid var(--border);
  padding: 10px 14px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-secondary);
  word-break: break-all;
  margin-top: 8px;
}

/* Interactive Checklist */
.interactive-checklist {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 28px 0;
}

.checklist-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.checklist-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.checklist-bar-bg {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 9999px;
  overflow: hidden;
  margin-bottom: 16px;
}

.checklist-fill {
  height: 100%;
  background: #10b981;
  width: 0%;
  transition: width 0.25s ease;
}

.checklist-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.checklist-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
}

.checklist-checkbox {
  width: 16px;
  height: 16px;
  accent-color: #10b981;
  cursor: pointer;
}

.checklist-label-text {
  font-size: 13px;
  color: var(--text-primary);
}

/* Author Profile Box */
.author-profile-box {
  display: flex;
  gap: 20px;
  align-items: center;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 48px 0 24px;
}

.author-large-img {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.author-details h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.author-bio {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Site Footer */
footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg);
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 10px;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.footer-link:hover {
  color: var(--text-primary);
}

/* Responsive */
@media (max-width: 900px) {
  .container {
    flex-direction: column;
    padding: 20px 16px;
    gap: 24px;
  }
  aside.sidebar {
    width: 100%;
    position: static;
    max-height: none;
  }
  .search-input {
    width: 140px;
  }
  .search-input:focus {
    width: 180px;
  }
  h1.guide-title {
    font-size: 26px;
  }
}


/* ==========================================================================
   FIRST-VERSION RESTORED COMPONENT RULES & ENHANCEMENTS
   ========================================================================== */

.main-wrapper {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 36px 28px 80px;
  display: flex;
  gap: 48px;
  flex: 1;
}

.nav-link-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 9999px;
  padding: 6px 14px;
  background: var(--bg-card-subtle);
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-link-pill:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

/* Sidebar Brand Avatar & Status */
.sidebar-brand-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}

.sidebar-status-box {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  margin-top: 20px;
  margin-bottom: 24px;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 8px rgba(34, 197, 94, 0.6);
  animation: statusPulse 2s infinite ease-in-out;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.status-meta {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* KPI Value & Sub-labels */
.kpi-value {
  font-size: 30px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 6px 0;
}

.kpi-sub {
  font-size: 11.5px;
  color: var(--text-muted);
}

/* Production Proof Badge & Evidence */
.production-proof-badge {
  background: var(--bg-card);
  border: 1px solid rgba(34, 197, 94, 0.35);
  border-radius: 12px;
  padding: 20px;
  margin: 28px 0;
}
[data-theme="light"] .production-proof-badge {
  background: #ffffff;
  border-color: rgba(34, 197, 94, 0.45);
}

.proof-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.proof-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 8px rgba(34, 197, 94, 0.6);
}

.proof-title {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-primary);
  flex: 1;
}

.proof-tag {
  font-size: 10.5px;
  font-weight: 700;
  background: rgba(34, 197, 94, 0.12);
  color: #22c55e;
  border: 1px solid rgba(34, 197, 94, 0.25);
  padding: 3px 10px;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.proof-image-wrapper {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  margin-bottom: 12px;
  background: #000000;
}

.proof-img {
  width: 100%;
  max-height: 480px;
  height: auto;
  display: block;
  object-fit: contain;
  background: #000000;
}

.proof-caption {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Resources & Screenshots Gallery */
.resources-gallery-box {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 32px 0;
}

.resources-notice {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.resource-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.resource-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.resource-preview-container {
  position: relative;
  width: 100%;
  height: 160px;
  background: #000000;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border);
}

.resource-preview-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.resource-info {
  padding: 12px 14px;
}

.resource-filename {
  font-family: var(--font-mono);
  font-size: 11px;
  color: #22c55e;
  margin-bottom: 4px;
}

.resource-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.resource-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Stepper Component */
.stepper-container {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 20px 0;
}

.step-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
}

.step-number {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-pill);
  color: var(--accent-pill-text);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-body h4 {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.step-body p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Comparison Cards */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 24px 0;
}
@media (max-width: 768px) {
  .comparison-grid { grid-template-columns: 1fr; }
}

.comparison-card {
  border-radius: 8px;
  padding: 18px;
  border: 1px solid var(--border);
  background: var(--bg-card-subtle);
}

.comparison-card.bad {
  border-color: rgba(239, 68, 68, 0.3);
  background: rgba(239, 68, 68, 0.03);
}

.comparison-card.good {
  border-color: rgba(34, 197, 94, 0.3);
  background: rgba(34, 197, 94, 0.03);
}

.comparison-tag {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.comparison-card.bad .comparison-tag { color: #ef4444; }
.comparison-card.good .comparison-tag { color: #22c55e; }

.comparison-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Window Mockup Container */
.mockup-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin: 24px 0;
}

.mockup-bar {
  background: var(--bg-card-subtle);
  border-bottom: 1px solid var(--border);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.mockup-dots {
  display: flex;
  gap: 6px;
}

.mockup-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--border-focus);
}

.mockup-title {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

.mockup-body {
  padding: 20px;
}

/* Calculator Supporting Classes */
.calc-control-group {
  margin-bottom: 18px;
}
.calc-results-matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 20px 0;
}
@media (max-width: 640px) {
  .calc-results-matrix { grid-template-columns: 1fr; }
}

.calc-result-number {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.calc-result-sub {
  font-size: 11px;
  color: var(--text-muted);
}

.calc-footer-note {
  font-size: 11.5px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 14px;
}

/* Simulator Supporting Classes */
.sim-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.sim-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.sim-simple-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-bottom: 12px;
}
.sim-test-btn {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  margin-bottom: 10px;
}
.sim-test-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
}

/* Checklist Supporting Classes */
.checklist-step-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
}
.checklist-progress-wrapper {
  margin-bottom: 20px;
}
.checklist-progress-text {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
}
.checklist-bar-fill {
  height: 6px;
  background: #22c55e;
  border-radius: 3px;
  width: 0%;
  transition: width 0.3s ease;
}
.checklist-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.checklist-completion-banner {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: 8px;
  padding: 14px 18px;
  color: #22c55e;
  font-size: 13px;
  font-weight: 600;
  margin-top: 18px;
  display: none;
}

/* Research & Ecosystem Grids */
.research-grid, .ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  margin-top: 24px;
}
.research-card, .ecosystem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.research-card:hover, .ecosystem-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
}
.research-pillar-tag, .ecosystem-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  color: #22c55e;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}
.research-card-title, .ecosystem-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.research-card-desc, .ecosystem-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
  flex: 1;
}
.research-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
  font-size: 12.5px;
  color: var(--text-muted);
}
.research-bullet::before {
  content: "→ ";
  color: var(--accent-pill);
}
.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}
.research-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

/* Template Boilerplate for New Guides */
.template-card {
  background: var(--bg-card);
  border: 1px dashed var(--border-focus);
  border-radius: 12px;
  padding: 24px;
  margin-top: 36px;
}
.template-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.template-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
}

/* Refined Responsive Adjustments */
@media (max-width: 960px) {
  .main-wrapper {
    flex-direction: column;
    padding: 24px 16px;
    gap: 32px;
  }
  aside.sidebar {
    width: 100%;
    position: static;
    max-height: none;
  }
}

/* Bilingual Direct Toggle Group */
.lang-toggle-group {
  display: flex;
  align-items: center;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border);
  border-radius: 9999px;
  padding: 2px;
  gap: 2px;
}
.lang-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.lang-btn:hover {
  color: var(--text-primary);
}
.lang-btn.active {
  background: var(--accent-pill);
  color: var(--accent-pill-text);
  font-weight: 700;
}