/* ==========================================
   THE DON DAVIS GARAGE ARCHIVE DESIGN SYSTEM
   ========================================== */

/* Typography & Custom Variables */
:root {
  --bg-vintage-paper: #FDFBF7;
  --bg-blueprint: #0F2042;
  --bg-blueprint-grid: #1A365D;
  --accent-red: #A71D2A;
  --accent-blue: #00d2ff;
  --text-ink: #1A1A1A;
  --text-paper-sub: #555555;
  --font-editorial-sans: 'Bebas Neue', sans-serif;
  --font-editorial-serif: 'Playfair Display', serif;
  --font-body: 'PT Serif', serif;
  --font-typewriter: 'Courier Prime', monospace;
  --font-technical: 'Outfit', sans-serif;
  
  --border-ink: 2px solid #1A1A1A;
  --border-ink-thin: 1px solid rgba(26, 26, 26, 0.15);
}

/* Global Reset & Base Elements */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-vintage-paper);
  color: var(--text-ink);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Vintage Paper Noise / Grain Overlay */
.vintage-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 999;
  opacity: 0.04;
  background-image: radial-gradient(circle, #000000 10%, transparent 11%),
                    radial-gradient(circle, #000000 10%, transparent 11%);
  background-size: 8px 8px;
  background-position: 0 0, 4px 4px;
}

/* Main Navigation Header */
.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 3rem;
  background-color: var(--bg-vintage-paper);
  border-bottom: var(--border-ink);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand {
  font-family: var(--font-editorial-sans);
  font-size: 2rem;
  letter-spacing: 0.05em;
  color: var(--text-ink);
}

.header-nav {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-family: var(--font-technical);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--text-ink);
  letter-spacing: 0.1em;
  position: relative;
  padding-bottom: 2px;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-red);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease;
}

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

.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ==========================================
   COMPONENT 1: THE 1960S COVER ISSUE (HERO)
   ========================================== */

.cover-section {
  padding: 2rem 3rem 4rem 3rem;
  background-color: var(--bg-vintage-paper);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.cover-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  border: var(--border-ink);
  padding: 2.5rem;
  position: relative;
  background-color: #fdfcf9;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

/* Magazine Metadata Strip */
.magazine-meta {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  border-bottom: var(--border-ink);
  padding-bottom: 0.8rem;
  margin-bottom: 2rem;
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.meta-item-center {
  text-align: center;
  color: var(--accent-red);
}

.meta-item:last-child {
  text-align: right;
}

/* Asymmetrical Magazine Layout Grid */
.magazine-grid {
  display: grid;
  grid-template-columns: 320px 1fr 320px;
  gap: 2.5rem;
  align-items: start;
}

.mag-col {
  display: flex;
  flex-direction: column;
}

.col-border-top {
  border-top: 4px solid var(--text-ink);
  width: 60px;
  margin-bottom: 1.5rem;
}

/* Typography styles inside the columns */
.editorial-subheading {
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  color: var(--text-paper-sub);
  margin-bottom: 0.3rem;
}

.editorial-subheading-accent {
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  color: var(--accent-red);
  margin-bottom: 0.3rem;
}

.editorial-heading-serif {
  font-family: var(--font-editorial-serif);
  font-size: 2.1rem;
  font-weight: 900;
  line-height: 1.1;
  color: var(--text-ink);
  margin-bottom: 1.2rem;
}

.editorial-heading-sans {
  font-family: var(--font-editorial-sans);
  font-size: 2.5rem;
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: var(--text-ink);
  margin-bottom: 1.2rem;
}

.editorial-lead {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.4;
  margin-bottom: 1.5rem;
  color: var(--text-ink);
}

.article-divider {
  border-top: var(--border-ink-thin);
  margin: 1.5rem 0;
  position: relative;
}

.article-divider::after {
  content: '✦';
  position: absolute;
  top: -11px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--bg-vintage-paper);
  padding: 0 8px;
  font-size: 0.8rem;
  color: var(--accent-red);
}

.editorial-body {
  font-size: 0.95rem;
  color: var(--text-paper-sub);
  text-align: justify;
  margin-bottom: 1.5rem;
}

/* Bullet highlights on the right */
.bullet-highlight {
  margin-bottom: 1.5rem;
}

.highlight-title {
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--accent-red);
  margin-bottom: 0.2rem;
}

.highlight-desc {
  font-size: 0.9rem;
  color: var(--text-paper-sub);
}

/* Icon & Tools vector styling */
.vintage-icon-box {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
  border: 1px dashed rgba(26,26,26,0.3);
  padding: 0.8rem;
}

.vintage-icon {
  width: 40px;
  height: 40px;
}

.icon-label {
  font-family: var(--font-typewriter);
  font-size: 0.75rem;
  font-weight: bold;
}

.vintage-tools-art {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}

.tools-vector {
  width: 60px;
  height: 60px;
}

.tools-text {
  display: flex;
  flex-direction: column;
  font-family: var(--font-typewriter);
  font-size: 0.7rem;
  font-weight: bold;
  color: var(--text-paper-sub);
}

/* Center Column (Visual Centerpiece) */
.center-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  position: relative;
  height: 100%;
}

.main-magazine-title {
  font-family: var(--font-editorial-serif);
  font-weight: 900;
  font-size: 6.8rem;
  line-height: 0.85;
  letter-spacing: -0.01em;
  color: var(--accent-red);
  text-align: center;
  margin-top: -10px;
  z-index: 10;
  width: 100%;
}

/* Custom overlay cutout layering */
.hero-car-container {
  width: 100%;
  margin: 1.5rem 0 1.5rem 0;
  z-index: 20;
  position: relative;
  border: 1px solid var(--text-ink);
  padding: 6px;
  background-color: #FFFFFF;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  justify-content: center;
  overflow: hidden;
}

.hero-car-container::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  right: 3px;
  bottom: 3px;
  border: 1px solid var(--accent-red);
  pointer-events: none;
  z-index: 8;
}

.hero-car-container:hover {
  transform: scale(1.02) rotate(-0.5deg);
}

.hero-car-image {
  width: 100%;
  height: auto;
  display: block;
  z-index: 2;
  transition: opacity 0.8s ease;
}

.hero-car-image.fade-out {
  opacity: 0;
  pointer-events: none;
}

/* 3D WebGL Canvas Container */
.hero-3d-canvas-container {
  position: absolute;
  top: 6px;
  left: 6px;
  right: 6px;
  bottom: 6px;
  z-index: 5;
  opacity: 0;
  transition: opacity 0.8s ease;
}

.hero-3d-canvas-container.loaded {
  opacity: 1;
}

/* Vintage Laboratory Loading Screen */
.hero-3d-loader {
  position: absolute;
  bottom: 15px;
  left: 15px;
  right: 15px;
  background-color: rgba(253, 251, 247, 0.95);
  border: var(--border-ink-thin);
  padding: 8px 12px;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-typewriter);
  font-size: 0.72rem;
  font-weight: bold;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  transition: opacity 0.5s ease;
}

.hero-3d-loader.fade-out {
  opacity: 0;
  pointer-events: none;
}

.loader-label {
  color: var(--accent-red);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.loader-bar-bg {
  flex-grow: 1;
  height: 6px;
  background-color: rgba(26, 26, 26, 0.1);
  border-radius: 3px;
  overflow: hidden;
  position: relative;
}

.loader-bar-progress {
  width: 0%;
  height: 100%;
  background-color: var(--accent-red);
  transition: width 0.1s ease;
}

.loader-progress-text {
  min-width: 35px;
  text-align: right;
  color: var(--text-ink);
}

.center-article-overlay {
  text-align: center;
  z-index: 30;
  padding: 0 1rem;
  width: 100%;
}

.mag-caption-text {
  font-family: var(--font-technical);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-ink);
  line-height: 1.4;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

.scroll-cta-btn {
  display: inline-block;
  background-color: var(--accent-red);
  color: #FFFFFF;
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  padding: 0.9rem 2.2rem;
  text-decoration: none;
  border-radius: 4px;
  transition: background-color 0.2s, transform 0.2s;
  box-shadow: 0 4px 10px rgba(167, 29, 42, 0.3);
}

.scroll-cta-btn:hover {
  background-color: #8b141e;
  transform: translateY(-2px);
}

/* Magazine Footer Margin */
.magazine-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: var(--border-ink);
  padding-top: 1rem;
  margin-top: 3rem;
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--text-ink);
}

.footer-page {
  font-family: var(--font-editorial-sans);
  font-size: 1.3rem;
  letter-spacing: 0.05em;
}

/* ==========================================
   COMPONENT 2: THE BLUEPRINT TIMELINE
   ========================================== */

.blueprint-section {
  background-color: var(--bg-vintage-paper);
  color: var(--text-ink);
  padding: 4rem 3rem;
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  border-top: var(--border-ink);
}

.blueprint-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  border: var(--border-ink);
  padding: 2rem;
  position: relative;
  box-shadow: 0 10px 30px rgba(0,0,0,0.03);
}

/* Technical Drawing Header */
.blueprint-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: var(--border-ink);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.blue-tag {
  font-family: var(--font-typewriter);
  font-size: 0.75rem;
  color: var(--accent-red);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 0.3rem;
}

.blue-main-title {
  font-family: var(--font-editorial-sans);
  font-size: 3rem;
  letter-spacing: 0.05em;
  line-height: 1;
  color: var(--text-ink);
}

.blue-doc-info {
  display: flex;
  flex-direction: column;
  font-family: var(--font-typewriter);
  font-size: 0.75rem;
  text-align: right;
  line-height: 1.6;
  color: var(--text-paper-sub);
}

/* Canvas Area with Vector Grid */
.blueprint-canvas {
  background-color: #F4F1EA;
  border: var(--border-ink);
  height: 420px;
  position: relative;
  overflow: hidden;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.5rem;
}

.blueprint-grid-overlay {
  position: absolute;
  top: -100px;
  left: 0;
  right: 0;
  bottom: -100px;
  background-image: linear-gradient(rgba(26, 26, 26, 0.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(26, 26, 26, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  will-change: transform;
}

/* SVG Vector Overrides for Cream Blueprint Paper */
.blueprint-svg g {
  stroke: var(--text-ink) !important;
}
.blueprint-svg path {
  stroke: var(--text-ink) !important;
}
.blueprint-svg path[stroke="#A71D2A"] {
  stroke: var(--accent-red) !important;
}
.blueprint-svg path[stroke="#00d2ff"], 
.blueprint-svg line[stroke="#00d2ff"] {
  stroke: var(--accent-red) !important;
}
.blueprint-svg circle {
  stroke: var(--text-ink) !important;
}
.blueprint-svg ellipse {
  stroke: var(--text-ink) !important;
}
.blueprint-svg text {
  fill: var(--text-ink) !important;
}
.blueprint-svg text[fill="#00d2ff"] {
  fill: var(--accent-red) !important;
}
.blueprint-svg circle[fill="#ffffff"], 
.blueprint-svg circle[fill="#ffffff"] {
  fill: var(--accent-red) !important;
  stroke: var(--accent-red) !important;
}

/* SVG Schematics Container */
.blueprint-wireframe-display {
  position: relative;
  width: 100%;
  height: 280px;
}

.blueprint-svg {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: auto;
  height: 100%;
  max-width: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.blueprint-svg.active {
  opacity: 1;
  visibility: visible;
}

/* Horizontal Timeline Track styling */
.blueprint-timeline-track {
  display: flex;
  justify-content: space-between;
  position: relative;
  width: 80%;
  margin: 0 auto;
  padding-bottom: 1rem;
  z-index: 10;
}

.timeline-line {
  position: absolute;
  top: 15px;
  left: 5%;
  right: 5%;
  height: 2px;
  background-color: rgba(26, 26, 26, 0.2);
  z-index: 1;
}

.timeline-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  z-index: 2;
  cursor: pointer;
}

.node-ring {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--text-ink);
  background-color: #F4F1EA;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.node-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--text-ink);
  transition: all 0.3s ease;
}

.node-year {
  font-family: var(--font-editorial-sans);
  font-size: 1.5rem;
  margin-top: 0.5rem;
  letter-spacing: 0.05em;
  color: var(--text-paper-sub);
  transition: color 0.3s ease;
}

.node-title {
  font-family: var(--font-technical);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-paper-sub);
  margin-top: 0.1rem;
}

/* Active Node States */
.timeline-node.active .node-ring,
.timeline-node:hover .node-ring {
  border-color: var(--accent-red);
  box-shadow: 0 0 10px rgba(167, 29, 42, 0.2);
}

.timeline-node.active .node-dot,
.timeline-node:hover .node-dot {
  background-color: var(--accent-red);
}

.timeline-node.active .node-year,
.timeline-node:hover .node-year {
  color: var(--text-ink);
}

.timeline-node.active .node-title,
.timeline-node:hover .node-title {
  color: var(--accent-red);
}

/* 3D Blueprint Canvas Container */
.blueprint-3d-canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 3;
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: auto;
}

.blueprint-3d-canvas-container.active {
  opacity: 1;
}

/* 3D Blueprint Interactive Controls Overlay */
.blueprint-3d-controls {
  position: absolute;
  top: 15px;
  right: 15px;
  background-color: rgba(244, 241, 234, 0.95);
  border: var(--border-ink);
  border-radius: 4px;
  padding: 10px 15px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-family: var(--font-typewriter);
  font-size: 0.72rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  min-width: 280px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease, visibility 0.5s ease;
  pointer-events: auto;
}

.blueprint-3d-controls.active {
  opacity: 1;
  visibility: visible;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.slider-row label {
  color: var(--accent-red);
  font-weight: bold;
}

.slider-row input[type="range"] {
  flex-grow: 1;
  accent-color: var(--accent-red);
  height: 4px;
  background-color: rgba(26, 26, 26, 0.15);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.btn-row {
  border-top: var(--border-ink-thin);
  padding-top: 8px;
  margin-top: 4px;
  justify-content: flex-end;
  gap: 8px;
}

.blueprint-control-btn {
  background: none;
  border: 1px solid var(--text-ink);
  padding: 3px 8px;
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.68rem;
  cursor: pointer;
  border-radius: 3px;
  color: var(--text-ink);
  transition: all 0.2s ease;
}

.blueprint-control-btn.active, .blueprint-control-btn:hover {
  background-color: var(--accent-red);
  color: #FFFFFF;
  border-color: var(--accent-red);
}

#blueprint-clip-value {
  min-width: 38px;
  text-align: right;
  font-weight: bold;
  color: var(--accent-red);
}

/* Details Panel below blueprint */
.blueprint-details-pane {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 3rem;
  border-top: var(--border-ink-thin);
  padding-top: 2rem;
}

/* Left: Portrait */
.pane-profile-column {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.profile-frame {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
}

.profile-image {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  border: 3px solid var(--accent-red);
  object-fit: cover;
}

.profile-label {
  font-family: var(--font-editorial-sans);
  font-size: 1.1rem;
  letter-spacing: 0.05em;
  margin-top: 0.5rem;
  color: var(--accent-red);
}

.profile-bio-text {
  font-size: 0.95rem;
  color: var(--text-ink);
  line-height: 1.5;
}

/* Right: Technical Table */
.pane-specs-column {
  display: flex;
  flex-direction: column;
}

.spec-section-header {
  font-family: var(--font-technical);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--accent-red);
  margin-bottom: 0.8rem;
}

.blueprint-spec-table {
  width: 100%;
  border-collapse: collapse;
}

.blueprint-spec-table td {
  padding: 0.8rem 0;
  font-size: 0.9rem;
  border-bottom: 1px solid rgba(26, 26, 26, 0.15);
}

.spec-label {
  font-family: var(--font-technical);
  font-weight: 800;
  width: 140px;
  letter-spacing: 0.05em;
  color: var(--text-ink);
}

.spec-val {
  font-family: var(--font-typewriter);
  color: var(--text-paper-sub);
}

/* ==========================================
   COMPONENT 3: INTERACTIVE BUILD LOG & SPECS
   ========================================== */

.logbook-section {
  padding: 5rem 3rem;
  background-color: var(--bg-vintage-paper);
}

.logbook-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 3.5rem;
  align-items: start;
}

/* Left: Workshop Paper Page */
.left-panel {
  display: flex;
  justify-content: center;
}

.paper-page {
  background-color: #FFFFFF;
  border: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: 5px 15px 35px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.02);
  width: 100%;
  max-width: 480px;
  padding: 2.2rem;
  position: relative;
  border-radius: 2px;
}

.paper-page::before {
  content: '';
  position: absolute;
  top: 0;
  left: 20px;
  bottom: 0;
  width: 1px;
  background-color: rgba(217, 30, 24, 0.2);
}

.page-header {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.75rem;
  color: var(--accent-red);
  letter-spacing: 0.1em;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
  padding-left: 1rem;
}

.logbook-img-frame {
  border: var(--border-ink);
  padding: 5px;
  background-color: #fdfbf7;
  margin-bottom: 1.5rem;
  margin-left: 1rem;
}

.logbook-img {
  width: 100%;
  height: auto;
  display: block;
  filter: grayscale(100%) contrast(1.15);
}

.img-caption {
  font-family: var(--font-typewriter);
  font-size: 0.65rem;
  color: var(--text-paper-sub);
  margin-top: 5px;
  text-align: center;
}

.typewritten-text {
  font-family: var(--font-typewriter);
  font-size: 0.85rem;
  color: #333333;
  line-height: 1.5;
  padding-left: 1rem;
  text-align: justify;
}

.typewritten-text p {
  margin-bottom: 1rem;
}

.page-footer-index {
  font-family: var(--font-typewriter);
  font-size: 0.75rem;
  text-align: center;
  color: var(--text-paper-sub);
  margin-top: 2rem;
}

/* Right Column: Workshop Manual Panel */
.right-panel {
  border: var(--border-ink);
  padding: 2.2rem;
  background-color: #fcfaf6;
}

.workshop-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: var(--border-ink);
  padding-bottom: 1rem;
  margin-bottom: 2rem;
}

.panel-section-title {
  font-family: var(--font-editorial-sans);
  font-size: 2.2rem;
  letter-spacing: 0.05em;
}

/* Tab button formatting */
.tabs-navigation {
  display: flex;
  gap: 0.5rem;
}

.tab-btn {
  background: none;
  border: var(--border-ink);
  padding: 0.5rem 1rem;
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.8rem;
  cursor: pointer;
  background-color: transparent;
  color: var(--text-ink);
  transition: all 0.2s ease;
  border-radius: 4px;
}

.tab-btn.active, .tab-btn:hover {
  background-color: var(--accent-red);
  color: #FFFFFF;
  border-color: var(--accent-red);
  box-shadow: 0 4px 10px rgba(167, 29, 42, 0.2);
}

/* Tab panes layout */
.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
  animation: fadeIn 0.4s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.workshop-layout-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2rem;
}

/* Focus image and description view */
.build-focus-view {
  display: flex;
  flex-direction: column;
}

.focus-img-container {
  border: var(--border-ink);
  background-color: #FFF;
  padding: 5px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  margin-bottom: 1rem;
}

.focus-img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  display: block;
}

.focus-meta {
  padding: 0.5rem 0;
}

.focus-title {
  font-family: var(--font-editorial-serif);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.focus-description {
  font-size: 0.9rem;
  color: var(--text-paper-sub);
}

/* Sidebar with Spec matrices and thumbnails list */
.build-specs-sidebar {
  display: flex;
  flex-direction: column;
}

.sidebar-title {
  font-family: var(--font-technical);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--accent-red);
  margin-bottom: 0.8rem;
  border-bottom: var(--border-ink-thin);
  padding-bottom: 0.3rem;
}

.spec-matrix {
  margin-bottom: 1.8rem;
}

.matrix-row {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed rgba(26, 26, 26, 0.15);
  padding: 0.5rem 0;
  font-size: 0.85rem;
}

.matrix-label {
  font-family: var(--font-technical);
  font-weight: 800;
  width: 110px;
}

.matrix-value {
  text-align: right;
  color: var(--text-paper-sub);
}

/* Thumbnails list */
.thumb-list-title {
  font-family: var(--font-technical);
  font-size: 0.8rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.build-thumbnails-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.thumb-item {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  border: 1px solid rgba(26, 26, 26, 0.15);
  padding: 0.4rem;
  background-color: #FFFFFF;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.thumb-item img {
  width: 50px;
  height: 40px;
  object-fit: cover;
  display: block;
  border: 1px solid #ddd;
}

.thumb-item span {
  font-family: var(--font-technical);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-ink);
}

.thumb-item.active, .thumb-item:hover {
  border-color: var(--accent-red);
  background-color: #fff1f2;
}

/* Engine Tab Content layout */
.engine-specs-layout {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2rem;
  align-items: center;
}

.engine-graphic-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1px dashed rgba(26,26,26,0.3);
  padding: 1.5rem;
  background-color: #FFFFFF;
}

.engine-vector {
  width: 100px;
  height: 100px;
  margin-bottom: 1rem;
}

.engine-title-callout {
  font-family: var(--font-typewriter);
  font-size: 0.75rem;
  font-weight: bold;
  color: var(--accent-red);
}

.tab-title {
  font-family: var(--font-editorial-serif);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.tab-description {
  font-size: 0.9rem;
  color: var(--text-paper-sub);
  margin-bottom: 1.2rem;
}

.engine-spec-table {
  width: 100%;
  border-collapse: collapse;
}

.engine-spec-table th, .engine-spec-table td {
  padding: 0.6rem;
  font-size: 0.85rem;
  text-align: left;
  border-bottom: 1px solid rgba(26, 26, 26, 0.15);
}

.engine-spec-table th {
  font-family: var(--font-technical);
  font-weight: 800;
  background-color: rgba(26, 26, 26, 0.05);
}

.engine-spec-table td:first-child {
  font-family: var(--font-technical);
  font-weight: 600;
  width: 150px;
}

.engine-spec-table td:last-child {
  font-family: var(--font-typewriter);
  color: var(--text-paper-sub);
}

/* Physics Tab styling */
.physics-layout {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.physics-header-pane {
  border-bottom: var(--border-ink-thin);
  padding-bottom: 0.5rem;
}

.waveform-container {
  background-color: #FFFFFF;
  border: var(--border-ink);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#waveform-canvas {
  width: 100%;
  height: 120px;
  background-color: #faf8f5;
  border: 1px solid rgba(0,0,0,0.08);
}

.waveform-controls {
  display: flex;
  justify-content: space-around;
  width: 100%;
  margin-top: 1rem;
}

.control-item {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.control-item label {
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.75rem;
}

.control-item input[type="range"] {
  accent-color: var(--accent-red);
}

/* LaTeX math formula styling */
.physics-math-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.formula-card {
  border: 1px solid rgba(26, 26, 26, 0.15);
  background-color: #FFFFFF;
  padding: 1rem;
  border-radius: 4px;
}

.formula-label {
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.75rem;
  color: var(--accent-red);
  display: block;
  margin-bottom: 0.5rem;
}

.math-expr {
  display: flex;
  justify-content: center;
  font-size: 0.95rem;
  padding: 0.5rem 0;
  overflow-x: auto;
}

/* ==========================================
   RESPONSIVE MEDIA QUERIES
   ========================================== */

@media (max-width: 1200px) {
  .magazine-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .mag-col {
    max-width: 600px;
    margin: 0 auto;
  }
  
  .center-col {
    order: -1;
  }
  
  .hero-car-container {
    width: 100%;
    margin: 0 0 1rem 0;
  }
  
  .blueprint-details-pane {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .logbook-container {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .main-header {
    padding: 1rem;
    flex-direction: column;
    gap: 1rem;
  }
  
  .cover-section, .blueprint-section, .logbook-section {
    padding: 2rem 1rem;
  }
  
  .cover-container, .blueprint-container, .right-panel {
    padding: 1rem;
  }
  
  .main-magazine-title {
    font-size: 4rem;
  }
  
  .blueprint-timeline-track {
    width: 100%;
  }
  
  .node-year {
    font-size: 1.1rem;
  }
  
  .workshop-layout-grid, .engine-specs-layout {
    grid-template-columns: 1fr;
  }
  
  .physics-math-block {
    grid-template-columns: 1fr;
  }
  
  .blueprint-canvas {
    height: 380px;
  }
}

/* ==========================================
   FEATURED SOCIAL FEEDS GRID & EMBEDS STYLING
   ========================================== */
.social-feeds-layout {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.social-header-pane {
  border-bottom: var(--border-ink-thin);
  padding-bottom: 0.5rem;
  margin-bottom: 0.2rem;
}

/* Interactive Embeds Container */
.social-embeds-container {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.embed-wrapper {
  border: var(--border-ink);
  background-color: #FFFFFF;
  padding: 10px;
  border-radius: 4px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
  display: flex;
  flex-direction: column;
}

.embed-title {
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.78rem;
  color: var(--accent-red);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
  padding-left: 4px;
  border-bottom: var(--border-ink-thin);
  padding-bottom: 6px;
  text-transform: uppercase;
}

.iframe-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  height: 0;
  overflow: hidden;
  border: 1px solid rgba(26, 26, 26, 0.15);
  border-radius: 2px;
  background-color: #000000;
}

.iframe-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Instagram Reel Embed is vertical */
.instagram-iframe-container {
  padding-bottom: 0;
  height: 420px;
  background-color: #FFFFFF;
}

.social-links-section-title {
  font-family: var(--font-technical);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--text-ink);
  margin-top: 0.8rem;
  margin-bottom: 1rem;
  border-bottom: var(--border-ink);
  padding-bottom: 6px;
  text-transform: uppercase;
}

/* Grid layout for remaining cards */
.social-feeds-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.2rem;
}

.social-card {
  border: var(--border-ink);
  background-color: #FFFFFF;
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-radius: 4px;
  position: relative;
  transition: transform 0.2s, box-shadow 0.2s;
  min-height: 160px;
  text-decoration: none;
}

.social-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.05);
}

.social-platform-badge {
  font-family: var(--font-technical);
  font-weight: 800;
  font-size: 0.7rem;
  color: var(--accent-red);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  letter-spacing: 0.05em;
}

.views-badge {
  background-color: rgba(167, 29, 42, 0.08);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.62rem;
}

.social-card-title {
  font-family: var(--font-editorial-serif);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-bottom: 0.4rem;
  line-height: 1.25;
}

.social-card-desc {
  font-size: 0.82rem;
  color: var(--text-paper-sub);
  margin-bottom: 1rem;
  line-height: 1.4;
}

.social-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: var(--border-ink-thin);
  padding-top: 0.8rem;
  font-family: var(--font-typewriter);
  font-size: 0.72rem;
  font-weight: bold;
  color: var(--text-paper-sub);
}

.play-button-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background-color: var(--accent-red);
  transition: background-color 0.2s;
}

.play-button-overlay svg {
  width: 12px;
  height: 12px;
  fill: #FFFFFF;
  margin-left: 2px;
}

.social-card:hover .play-button-overlay {
  background-color: var(--text-ink);
}

@media (max-width: 900px) {
  .social-embeds-container {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
  .instagram-iframe-container {
    height: 480px; /* slightly taller on mobile stack */
  }
}

/* Navigation Link Active State */
.nav-link.active {
  color: var(--accent-red);
}
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Technical Print Footer */
.main-footer {
  background-color: var(--bg-vintage-paper);
  border-top: var(--border-ink);
  padding: 4rem 3rem 2rem 3rem;
  margin-top: 5rem;
  font-family: var(--font-technical);
}

.footer-container {
  max-width: 1400px;
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: var(--border-ink-thin);
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand-title {
  font-family: var(--font-editorial-sans);
  font-size: 1.8rem;
  letter-spacing: 0.05em;
}

.footer-tagline {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--text-paper-sub);
  line-height: 1.5;
  max-width: 320px;
}

.footer-doc-badge {
  display: flex;
  gap: 1rem;
  margin-top: auto;
}

.footer-doc-badge span {
  font-family: var(--font-typewriter);
  font-size: 0.7rem;
  font-weight: bold;
  border: 1px dashed rgba(26,26,26,0.3);
  padding: 0.3rem 0.6rem;
  background-color: rgba(26,26,26,0.02);
}

.footer-col-header {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--accent-red);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  font-weight: 800;
}

.footer-links-col {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer-link {
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--text-ink);
  transition: color 0.2s ease, padding-left 0.2s ease;
  font-weight: 600;
}

.footer-link:hover {
  color: var(--accent-red);
  padding-left: 4px;
}

.footer-spec-col {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer-spec-item {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed rgba(26,26,26,0.1);
  padding-bottom: 0.4rem;
  font-size: 0.8rem;
}

.footer-spec-item .label {
  font-family: var(--font-typewriter);
  font-weight: bold;
  color: var(--text-paper-sub);
}

.footer-spec-item .val {
  font-weight: 600;
  color: var(--text-ink);
}

.footer-bottom-strip {
  display: flex;
  justify-content: space-between;
  padding-top: 1.5rem;
  font-family: var(--font-typewriter);
  font-size: 0.72rem;
  color: var(--text-paper-sub);
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .main-footer {
    padding: 3rem 1.5rem 1.5rem 1.5rem;
  }
  .footer-bottom-strip {
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
    text-align: center;
  }
}