/* ==========================================================================
   Synergetics Operating System (SOS) - Official Website Stylesheet
   Pure CSS3 Implementation
   ========================================================================== */

:root {
  --color-primary: #0879D1;
  --color-teal: #159C91;
  --color-green: #79B96B;
  --color-orange: #F2A52B;
  --color-navy: #12345A;
  --color-white: #FFFFFF;
  --color-pale-blue: #EAF4FB;
  --color-cool-grey: #F3F6F8;
  --color-border: #D7E4EF;

  --color-text: #12345A;
  --color-text-muted: #5B7185;
  --color-background: #FFFFFF;

  --radius-card: 16px;
  --radius-button: 8px;
  --section-spacing: 88px;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --shadow-sm: 0 1px 2px rgba(18, 52, 90, 0.05);
  --shadow-md: 0 4px 12px rgba(18, 52, 90, 0.08);
  --shadow-lg: 0 10px 30px rgba(18, 52, 90, 0.12);
  --shadow-xl: 0 20px 40px rgba(18, 52, 90, 0.16);
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--color-background);
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--color-teal);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* Container & Typography */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-spacing) 0;
  position: relative;
}

.section-bg-white {
  background-color: var(--color-white);
}

.section-bg-pale {
  background-color: var(--color-pale-blue);
}

.section-bg-cool {
  background-color: var(--color-cool-grey);
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 56px auto;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-navy);
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-button);
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(8, 121, 209, 0.28);
}

.btn-primary:hover {
  background-color: #0764ad;
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(8, 121, 209, 0.35);
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-navy);
  border: 1.5px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: #f7fafc;
  transform: translateY(-2px);
}

.btn-teal {
  background-color: var(--color-teal);
  color: var(--color-white);
}

.btn-teal:hover {
  background-color: #0f7a71;
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-pill {
  border-radius: 9999px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

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

.brand-logo-img {
  height: 40px;
  width: auto;
  object-fit: contain;
}

.brand-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
}

.brand-text .part-synergetic {
  color: var(--color-primary);
}

.brand-text .part-os {
  color: var(--color-orange);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-navy);
  padding: 6px 2px;
  position: relative;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
  color: var(--color-navy);
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 64px 0 80px 0;
  overflow: hidden;
  background: radial-gradient(circle at 85% 30%, rgba(234, 244, 251, 0.8) 0%, rgba(255, 255, 255, 1) 70%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-content {
  max-width: 650px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.hero-heading {
  font-size: 3.125rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-navy);
  margin-bottom: 24px;
  letter-spacing: -0.03em;
}

.hero-description {
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.hero-description-secondary {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  background-color: var(--color-pale-blue);
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-navy);
}

.status-dot-pulse {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-green);
  box-shadow: 0 0 0 0 rgba(121, 185, 107, 0.7);
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% {
    box-shadow: 0 0 0 0 rgba(121, 185, 107, 0.7);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(121, 185, 107, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(121, 185, 107, 0);
  }
}

.hero-visual-card {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-logo-img {
  width: 100%;
  max-width: 480px;
  height: auto;
  filter: drop-shadow(0 15px 35px rgba(8, 121, 209, 0.15));
  transition: transform 0.5s ease;
}

.hero-logo-img:hover {
  transform: scale(1.02);
}

/* ==========================================================================
   Concept Cards Grid (Directly below Hero)
   ========================================================================== */
.concepts-row-section {
  padding: 0 0 64px 0;
  background-color: var(--color-white);
}

.concept-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.concept-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.concept-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.concept-card-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  background-color: var(--color-pale-blue);
  color: var(--color-primary);
}

.concept-card:nth-child(2) .concept-card-icon-wrap {
  background-color: rgba(21, 156, 145, 0.12);
  color: var(--color-teal);
}

.concept-card:nth-child(3) .concept-card-icon-wrap {
  background-color: rgba(8, 121, 209, 0.12);
  color: var(--color-primary);
}

.concept-card:nth-child(4) .concept-card-icon-wrap {
  background-color: rgba(121, 185, 107, 0.15);
  color: var(--color-green);
}

.concept-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 12px;
  line-height: 1.35;
}

.concept-card-body {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: 24px;
  flex-grow: 1;
}

.concept-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.badge-tag {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 9999px;
  background-color: var(--color-pale-blue);
  color: var(--color-primary);
}

.badge-tag.badge-teal {
  background-color: rgba(21, 156, 145, 0.12);
  color: var(--color-teal);
}

.badge-tag.badge-green {
  background-color: rgba(121, 185, 107, 0.15);
  color: #49823c;
}

.badge-tag.badge-orange {
  background-color: rgba(242, 165, 43, 0.15);
  color: #b8710e;
}

.card-arrow-link {
  color: var(--color-primary);
  display: flex;
  align-items: center;
  font-size: 1.2rem;
  transition: transform 0.2s ease;
}

.concept-card:hover .card-arrow-link {
  transform: translateX(4px);
  color: var(--color-teal);
}

/* ==========================================================================
   Section: What is SOS
   ========================================================================== */
.what-is-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.lead-prose {
  font-size: 1.05rem;
  color: var(--color-navy);
  line-height: 1.75;
  margin-bottom: 20px;
}

.prose-muted {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.quote-highlight-box {
  background-color: var(--color-white);
  border-left: 4px solid var(--color-primary);
  padding: 24px;
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  box-shadow: var(--shadow-sm);
  margin-top: 28px;
}

.quote-text {
  font-style: italic;
  font-size: 0.95rem;
  color: var(--color-navy);
  line-height: 1.65;
}

.visual-metric-cluster {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.metric-panel {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.metric-panel:hover {
  border-color: var(--color-teal);
  transform: translateY(-2px);
}

.metric-panel-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.metric-panel-label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 6px;
}

.metric-panel-desc {
  font-size: 0.825rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   Section: Why Explore SOS (5 Subsections)
   ========================================================================== */
.why-subsections-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.why-subsections-grid .why-subcard:nth-child(4),
.why-subsections-grid .why-subcard:nth-child(5) {
  grid-column: span 1.5;
}

.why-subcard {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.why-subcard:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.subcard-num {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-teal);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.subcard-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 14px;
  line-height: 1.35;
}

.subcard-body {
  font-size: 0.925rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

.why-conclusion-card {
  background: linear-gradient(135deg, var(--color-navy) 0%, #1a4574 100%);
  color: var(--color-white);
  border-radius: var(--radius-card);
  padding: 36px 40px;
  text-align: center;
  max-width: 960px;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
}

.why-conclusion-text {
  font-size: 1.15rem;
  line-height: 1.65;
  font-weight: 500;
  color: #e2eaf3;
}

/* ==========================================================================
   Section: Buckminster Fuller & Synergetics
   ========================================================================== */
.synergetics-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 56px;
}

.synergetics-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.synergetics-card:hover {
  border-color: var(--color-teal);
  transform: translateY(-3px);
}

.synergetics-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.synergetics-card-title svg {
  color: var(--color-teal);
}

.synergetics-card-text {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.comparison-container {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

.comparison-header {
  text-align: center;
  margin-bottom: 32px;
}

.comparison-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 8px;
}

.comparison-subtitle {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 24px;
}

.comparison-col {
  padding: 28px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.comparison-col.col-conventional {
  background-color: var(--color-cool-grey);
}

.comparison-col.col-sos {
  background-color: var(--color-pale-blue);
  border-color: rgba(8, 121, 209, 0.3);
}

.comparison-col-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
}

.comparison-col-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-navy);
}

.comparison-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.comparison-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--color-text);
  line-height: 1.5;
}

.comparison-item svg {
  flex-shrink: 0;
  margin-top: 3px;
}

.comparison-disclaimer {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: italic;
  text-align: center;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   Section: Proposed SOS Architecture (Interactive Diagram)
   ========================================================================== */
.architecture-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 36px;
  align-items: start;
}

.arch-canvas-wrap {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-md);
  position: relative;
}

.arch-svg-diagram {
  width: 100%;
  height: auto;
  display: block;
}

.arch-node {
  cursor: pointer;
  transition: all 0.25s ease;
}

.arch-node rect {
  transition: all 0.25s ease;
}

.arch-node:hover rect {
  stroke-width: 2.5;
  filter: drop-shadow(0 4px 12px rgba(8, 121, 209, 0.2));
}

.arch-node.selected rect {
  stroke: var(--color-orange);
  stroke-width: 3;
  filter: drop-shadow(0 6px 16px rgba(242, 165, 43, 0.3));
}

.arch-sidebar-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 32px;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 100px;
}

.arch-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.arch-card-title-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.arch-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-navy);
}

.arch-card-status-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 9999px;
  background-color: var(--color-pale-blue);
  color: var(--color-primary);
}

.arch-detail-section {
  margin-bottom: 20px;
}

.arch-detail-heading {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-teal);
  margin-bottom: 6px;
}

.arch-detail-text {
  font-size: 0.925rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.arch-nav-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.arch-pill-btn {
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 9999px;
  background-color: var(--color-cool-grey);
  color: var(--color-navy);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

.arch-pill-btn:hover {
  background-color: var(--color-pale-blue);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.arch-pill-btn.active {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* ==========================================================================
   Section: Rust Scheduler Simulation
   ========================================================================== */
.simulation-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
}

.sim-info-col {
  display: flex;
  flex-direction: column;
}

.sim-repo-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  margin-top: 24px;
}

.sim-repo-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 8px;
}

.sim-repo-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  word-break: break-all;
}

.sim-repo-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-teal);
  background-color: rgba(21, 156, 145, 0.1);
  padding: 6px 14px;
  border-radius: 9999px;
  margin-bottom: 24px;
}

.sim-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.code-window-card {
  background-color: var(--color-navy);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  border: 1px solid #1f4773;
}

.code-window-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background-color: #0b223c;
  border-bottom: 1px solid #1a3a5e;
}

.code-dots {
  display: flex;
  gap: 8px;
}

.code-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background-color: #ff5f56; }
.dot-yellow { background-color: #ffbd2e; }
.dot-green { background-color: #27c93f; }

.code-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #8da4be;
}

.code-block {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.825rem;
  line-height: 1.65;
  color: #d1e2f3;
  overflow-x: auto;
}

.kw { color: #ff7b72; font-weight: 600; }
.fn { color: #d2a8ff; }
.type { color: #79c0ff; }
.comm { color: #6e7f96; font-style: italic; }
.str { color: #a5d6ff; }
.num { color: var(--color-orange); }

/* ==========================================================================
   Section: Evolving Prototype
   ========================================================================== */
.prototype-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
  align-items: center;
}

.prototype-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 36px;
  box-shadow: var(--shadow-md);
}

.proto-table-wrap {
  margin: 28px 0;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
}

.proto-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.proto-table th, .proto-table td {
  padding: 12px 16px;
  text-align: left;
}

.proto-table th {
  background-color: var(--color-cool-grey);
  font-weight: 700;
  color: var(--color-navy);
  border-bottom: 1px solid var(--color-border);
}

.proto-table td {
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

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

.tag-verified {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  background-color: rgba(121, 185, 107, 0.15);
  color: #3b7430;
}

.tag-experimental {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  background-color: rgba(8, 121, 209, 0.12);
  color: var(--color-primary);
}

.tag-proposed {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  background-color: rgba(242, 165, 43, 0.15);
  color: #b06808;
}

/* ==========================================================================
   Section: Two Original OS UI/UX Concepts & Lightbox
   ========================================================================== */
.concepts-gallery-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 24px;
}

.concept-image-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.concept-image-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.concept-img-wrapper {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background-color: #0b1526;
  cursor: pointer;
}

.concept-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.concept-img-wrapper:hover .concept-img {
  transform: scale(1.03);
}

.concept-overlay-zoom {
  position: absolute;
  top: 16px;
  right: 16px;
  background-color: rgba(18, 52, 90, 0.8);
  color: var(--color-white);
  padding: 8px 12px;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  backdrop-filter: blur(8px);
  opacity: 0;
  transform: translateY(-4px);
  transition: var(--transition);
}

.concept-img-wrapper:hover .concept-overlay-zoom {
  opacity: 1;
  transform: translateY(0);
}

.concept-caption-box {
  padding: 24px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.concept-card-heading {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 8px;
}

.concept-card-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: 16px;
}

.concept-disclosure-notice {
  background-color: var(--color-pale-blue);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.875rem;
  color: var(--color-navy);
  max-width: 900px;
  margin: 0 auto;
}

.concept-disclosure-notice svg {
  flex-shrink: 0;
  color: var(--color-primary);
}

/* Lightbox Modal */
.lightbox-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background-color: rgba(10, 25, 45, 0.92);
  backdrop-filter: blur(12px);
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.lightbox-modal.active {
  display: flex;
}

.lightbox-content-box {
  position: relative;
  max-width: 1080px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-navy);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.lightbox-image-wrap {
  width: 100%;
  max-height: 75vh;
  background-color: #050e18;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.lightbox-img {
  max-width: 100%;
  max-height: 75vh;
  object-fit: contain;
}

.lightbox-caption-bar {
  padding: 18px 24px;
  background-color: var(--color-navy);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.lightbox-caption-text {
  font-size: 0.95rem;
  font-weight: 500;
  color: #e2eaf3;
}

.lightbox-close-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  background-color: rgba(255, 255, 255, 0.15);
  color: var(--color-white);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.lightbox-close-btn:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

.lightbox-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(255, 255, 255, 0.15);
  color: var(--color-white);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.lightbox-nav-btn:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

.lightbox-prev-btn { left: 16px; }
.lightbox-next-btn { right: 16px; }

/* ==========================================================================
   Section: Founder Biography
   ========================================================================== */
.founder-profile-grid {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 48px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 48px;
  box-shadow: var(--shadow-md);
  align-items: center;
}

.founder-photo-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.founder-img-frame {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid var(--color-white);
  box-shadow: 0 8px 30px rgba(8, 121, 209, 0.2);
  margin-bottom: 24px;
  position: relative;
  background-color: var(--color-pale-blue);
}

.founder-photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.founder-name-heading {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--color-navy);
  margin-bottom: 6px;
}

.founder-role-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.founder-links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.founder-bio-col {
  display: flex;
  flex-direction: column;
}

.bio-paragraph {
  font-size: 0.965rem;
  color: var(--color-navy);
  line-height: 1.75;
  margin-bottom: 16px;
}

.bio-highlight-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--color-pale-blue);
  color: var(--color-primary);
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
  align-self: flex-start;
}

.academic-origin-box {
  background-color: var(--color-pale-blue);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-teal);
  border-radius: 0 12px 12px 0;
  padding: 16px 20px;
  margin: 16px 0 20px 0;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.academic-origin-icon {
  flex-shrink: 0;
  color: var(--color-teal);
  margin-top: 2px;
}

.academic-origin-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.academic-origin-text {
  font-size: 0.92rem;
  color: var(--color-text);
  line-height: 1.55;
}

/* ==========================================================================
   Section: Research Publications
   ========================================================================== */
.publications-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.publication-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 36px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.publication-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.pub-badge-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.pub-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy);
  line-height: 1.4;
  margin-bottom: 14px;
}

.pub-desc {
  font-size: 0.925rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
  flex-grow: 1;
}

.pub-footer {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pub-platform-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-teal);
}

/* ==========================================================================
   Section: Open-Source Collaboration
   ========================================================================== */
.collab-roles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.collab-role-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: var(--transition);
}

.collab-role-card:hover {
  border-color: var(--color-teal);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.collab-role-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: var(--color-pale-blue);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px auto;
}

.collab-role-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 6px;
}

.collab-role-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.collab-cta-box {
  background-color: var(--color-white);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-card);
  padding: 40px;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.collab-cta-heading {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.collab-cta-text {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.collab-cta-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

/* ==========================================================================
   Section: Development Roadmap (5 Stages)
   ========================================================================== */
.roadmap-timeline-wrap {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 0;
}

.roadmap-timeline-wrap::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 32px;
  width: 3px;
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-teal) 60%, var(--color-green) 100%);
  border-radius: 3px;
}

.roadmap-step {
  position: relative;
  padding-left: 80px;
  margin-bottom: 40px;
}

.roadmap-step:last-child {
  margin-bottom: 0;
}

.roadmap-step-marker {
  position: absolute;
  left: 17px;
  top: 0;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background-color: var(--color-white);
  border: 3px solid var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  box-shadow: 0 0 0 6px var(--color-pale-blue);
  z-index: 2;
}

.roadmap-step.active .roadmap-step-marker {
  border-color: var(--color-orange);
  color: var(--color-orange);
  box-shadow: 0 0 0 6px rgba(242, 165, 43, 0.2);
}

.roadmap-step.completed .roadmap-step-marker {
  background-color: var(--color-teal);
  border-color: var(--color-teal);
  color: var(--color-white);
}

.roadmap-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.roadmap-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.roadmap-step-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-teal);
  margin-bottom: 6px;
}

.roadmap-step-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.roadmap-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.roadmap-bullet-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--color-text-muted);
}

.roadmap-bullet-item svg {
  flex-shrink: 0;
  color: var(--color-teal);
  margin-top: 4px;
}

/* ==========================================================================
   Section: FAQ Accordion
   ========================================================================== */
.faq-accordion-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--color-primary);
}

.faq-button {
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-navy);
  background: none;
  border: none;
  cursor: pointer;
}

.faq-chevron {
  transition: transform 0.3s ease;
  color: var(--color-primary);
  flex-shrink: 0;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-collapse {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out;
}

.faq-answer-inner {
  padding: 0 24px 24px 24px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-navy);
  color: #cfddec;
  padding: 72px 0 36px 0;
  border-top: 1px solid #1a3c63;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}

.footer-brand-col {
  max-width: 360px;
}

.footer-logo-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-logo-img {
  height: 36px;
  width: auto;
  filter: brightness(1.1);
}

.footer-brand-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-white);
}

.footer-brand-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #9cb2c9;
  margin-bottom: 20px;
}

.footer-heading {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-white);
  margin-bottom: 20px;
}

.footer-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 0.9rem;
  color: #a8bdd4;
  transition: var(--transition);
}

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

.footer-disclaimer-box {
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 36px;
  font-size: 0.85rem;
  line-height: 1.6;
  color: #8da4be;
  text-align: center;
}

.footer-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* ==========================================================================
   Architecture Blueprint & Design Model Showcase Cards
   ========================================================================== */
.arch-blueprint-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-bottom: 48px;
  transition: var(--transition);
}

.arch-blueprint-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.arch-blueprint-header {
  padding: 22px 28px;
  background-color: var(--color-pale-blue);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.arch-blueprint-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-navy);
  display: flex;
  align-items: center;
  gap: 10px;
}

.arch-blueprint-img-wrap {
  position: relative;
  background-color: #f8fbfe;
  padding: 24px;
  display: flex;
  justify-content: center;
  cursor: pointer;
  border-bottom: 1px solid var(--color-border);
}

.arch-blueprint-img {
  width: 100%;
  max-width: 1080px;
  height: auto;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease;
  border: 1px solid var(--color-border);
}

.arch-blueprint-img-wrap:hover .arch-blueprint-img {
  transform: scale(1.01);
}

.arch-blueprint-body {
  padding: 28px 32px;
}

.arch-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.arch-feature-item {
  background-color: var(--color-cool-grey);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px;
  transition: var(--transition);
}

.arch-feature-item:hover {
  border-color: var(--color-teal);
  background-color: #edf3f7;
}

.arch-feature-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.arch-feature-desc {
  font-size: 0.86rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* Mobile Nav Actions inside drawer */
.mobile-nav-actions {
  display: none;
}

/* ==========================================================================
   Responsive Media Queries: Desktop, Tablet, and Mobile
   ========================================================================== */

/* 1. Laptops and Tablets (<= 1080px) */
@media (max-width: 1080px) {
  :root {
    --section-spacing: 72px;
  }

  .header-container {
    height: 68px;
  }

  /* Switch top bar navigation to mobile drawer to prevent 12-link wrapping */
  .main-nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background-color: #ffffff;
    border-bottom: 2px solid var(--color-border);
    flex-direction: column;
    padding: 24px 20px 32px 20px;
    box-shadow: 0 16px 36px rgba(10, 25, 45, 0.16);
    display: none;
    max-height: calc(100vh - 68px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    z-index: 999;
  }

  .main-nav.open {
    display: flex;
    animation: navSlideDown 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  }

  @keyframes navSlideDown {
    from {
      opacity: 0;
      transform: translateY(-8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 6px;
  }

  .nav-link {
    font-size: 1rem;
    font-weight: 600;
    width: 100%;
    padding: 12px 14px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    color: var(--color-navy);
  }

  .nav-link:hover,
  .nav-link.active {
    background-color: var(--color-pale-blue);
    color: var(--color-primary);
  }

  .nav-link.active::after {
    display: none;
  }

  /* Show Mobile Action CTAs inside drawer */
  .mobile-nav-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--color-border);
  }

  .btn-mobile-action {
    width: 100%;
    justify-content: center;
    padding: 12px 20px;
    font-size: 0.95rem;
    font-weight: 700;
    border-radius: 8px;
  }

  .mobile-nav-socials {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    width: 100%;
  }

  .btn-mobile-social {
    width: 100%;
    justify-content: center;
    padding: 10px 16px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 8px;
  }

  /* Header buttons on top bar */
  .header-actions .btn {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* Layout grids for 769px - 1080px */
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-content {
    margin: 0 auto;
  }

  .hero-ctas {
    justify-content: center;
  }

  .hero-heading {
    font-size: 2.6rem;
  }

  .hero-logo-img {
    max-width: 400px;
    margin: 0 auto;
  }

  .concept-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .what-is-grid,
  .architecture-container,
  .simulation-grid,
  .prototype-grid,
  .founder-profile-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .arch-sidebar-card {
    position: static;
  }

  .why-subsections-grid {
    grid-template-columns: 1fr 1fr;
  }

  .why-subsections-grid .why-subcard:nth-child(4),
  .why-subsections-grid .why-subcard:nth-child(5) {
    grid-column: span 1;
  }

  .synergetics-cards-grid,
  .collab-roles-grid,
  .arch-features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

/* 2. Tablets & Mobile Phones (<= 768px) */
@media (max-width: 768px) {
  :root {
    --section-spacing: 56px;
  }

  .container {
    padding: 0 20px;
  }

  .header-container {
    height: 64px;
  }

  .main-nav {
    top: 64px;
    max-height: calc(100vh - 64px);
  }

  .hero-section {
    padding: 44px 0 60px 0;
  }

  .hero-heading {
    font-size: 2.15rem;
    line-height: 1.2;
  }

  .hero-description {
    font-size: 1.05rem;
  }

  .hero-logo-img {
    max-width: 320px;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .section-subtitle {
    font-size: 1rem;
  }

  /* All multi-column sections collapse to 1 column */
  .concept-cards-grid,
  .why-subsections-grid,
  .synergetics-cards-grid,
  .comparison-grid,
  .concepts-gallery-grid,
  .publications-grid,
  .collab-roles-grid,
  .arch-features-grid {
    grid-template-columns: 1fr;
  }

  /* Blueprint Cards */
  .arch-blueprint-card {
    margin-bottom: 36px;
  }

  .arch-blueprint-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 18px 20px;
  }

  .arch-blueprint-title {
    font-size: 1.15rem;
  }

  .arch-blueprint-img-wrap {
    padding: 12px;
  }

  .arch-blueprint-body {
    padding: 22px 20px;
  }

  /* Architecture Interactive Canvas */
  .arch-canvas-wrap {
    padding: 14px 10px;
  }

  .arch-sidebar-card {
    padding: 24px 18px;
  }

  .arch-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .arch-nav-selector {
    gap: 6px;
  }

  .arch-pill-btn {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  /* Founder Profile */
  .founder-profile-grid {
    padding: 32px 20px;
    gap: 28px;
  }

  .founder-img-frame {
    width: 200px;
    height: 200px;
  }

  .founder-name-heading {
    font-size: 1.5rem;
  }

  .comparison-container {
    padding: 20px 16px;
  }

  .comparison-col {
    padding: 20px 16px;
  }

  .code-block {
    padding: 16px 14px;
    font-size: 0.78rem;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom-bar {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  /* Lightbox Modal Responsive */
  .lightbox-modal {
    padding: 12px;
  }

  .lightbox-content-box {
    max-height: 94vh;
    border-radius: 12px;
  }

  .lightbox-image-wrap {
    max-height: 65vh;
  }

  .lightbox-img {
    max-height: 65vh;
  }

  .lightbox-caption-bar {
    padding: 12px 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .lightbox-caption-text {
    font-size: 0.85rem;
    line-height: 1.4;
  }

  .lightbox-close-btn {
    top: 10px;
    right: 10px;
    width: 36px;
    height: 36px;
  }

  .lightbox-nav-btn {
    width: 38px;
    height: 38px;
  }

  .lightbox-prev-btn { left: 8px; }
  .lightbox-next-btn { right: 8px; }
}

/* 3. Small Mobile Phones (<= 480px) */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .brand-logo-img {
    height: 34px;
  }

  .brand-text {
    font-size: 1.15rem;
  }

  .hero-heading {
    font-size: 1.85rem;
  }

  .hero-eyebrow {
    font-size: 0.72rem;
    letter-spacing: 0.08em;
  }

  .hero-ctas {
    flex-direction: column;
    width: 100%;
  }

  .hero-ctas .btn {
    width: 100%;
  }

  .hero-status-pill {
    width: 100%;
    justify-content: center;
    font-size: 0.78rem;
    padding: 8px 12px;
    text-align: center;
  }

  .visual-metric-cluster {
    grid-template-columns: 1fr;
  }

  .metric-panel {
    padding: 16px;
  }

  .concept-card {
    padding: 20px 16px;
  }

  .quote-highlight-box {
    padding: 16px;
  }

  .arch-blueprint-body {
    padding: 18px 14px;
  }

  .arch-features-grid {
    gap: 14px;
  }

  .arch-feature-item {
    padding: 16px;
  }

  .arch-pill-btn {
    width: 100%;
    text-align: center;
  }

  .sim-repo-card {
    padding: 20px 16px;
  }

  .sim-actions {
    flex-direction: column;
    width: 100%;
  }

  .sim-actions .btn {
    width: 100%;
  }

  .code-block {
    padding: 12px;
    font-size: 0.72rem;
  }

  .prototype-card {
    padding: 24px 16px;
  }

  .founder-profile-grid {
    padding: 24px 16px;
    gap: 20px;
  }

  .founder-img-frame {
    width: 165px;
    height: 165px;
  }

  .founder-name-heading {
    font-size: 1.35rem;
  }

  .founder-links-row {
    flex-direction: column;
    width: 100%;
  }

  .founder-links-row .btn {
    width: 100%;
  }

  .academic-origin-box {
    padding: 14px;
    flex-direction: column;
    gap: 8px;
  }

  .collab-ownership-box {
    padding: 20px 16px;
  }

  .collab-actions {
    flex-direction: column;
    width: 100%;
  }

  .collab-actions .btn {
    width: 100%;
  }

  .collab-email-cta {
    padding: 12px 14px;
    font-size: 0.85rem;
    word-break: break-all;
    flex-direction: column;
    text-align: center;
  }

  .roadmap-step {
    padding-left: 36px;
  }

  .roadmap-step-marker {
    width: 28px;
    height: 28px;
    font-size: 0.8rem;
    left: -14px;
  }

  .roadmap-card {
    padding: 20px 16px;
  }

  .faq-button {
    padding: 16px 14px;
    font-size: 0.95rem;
  }

  .faq-answer-inner {
    padding: 0 14px 16px 14px;
    font-size: 0.9rem;
  }

  .footer-disclaimer-box {
    padding: 16px 14px;
    font-size: 0.82rem;
  }
}