/* ==========================================================================
   V.I.S.O.R. Clinical Glassmorphism Design System
   Medical & Mechatronic Engineering Theme
   ========================================================================== */

:root {
  /* Medical Palette - Calibrated Clinical Colors */
  --med-teal: #0d9488;
  --med-teal-light: #14b8a6;
  --med-teal-dark: #0f766e;
  --med-teal-subtle: rgba(20, 184, 166, 0.12);
  --med-teal-border: rgba(20, 184, 166, 0.28);
  
  --med-emerald: #059669;
  --med-emerald-light: #10b981;
  --med-emerald-subtle: rgba(16, 185, 129, 0.12);
  
  --med-red: #dc2626;
  --med-red-light: #ef4444;
  --med-red-subtle: rgba(220, 38, 38, 0.12);
  --med-red-border: rgba(239, 68, 68, 0.3);

  --med-amber: #d97706;
  --med-amber-subtle: rgba(217, 119, 6, 0.12);

  /* Deep Clinical Slate Surfaces */
  --bg-deep: #070d18;
  --bg-surface: #0c1527;
  --bg-card: rgba(15, 27, 49, 0.72);
  --bg-card-hover: rgba(21, 38, 68, 0.85);
  --bg-code: #091120;
  
  /* Glassmorphism & Borders */
  --glass-border: rgba(148, 163, 184, 0.15);
  --glass-border-hover: rgba(20, 184, 166, 0.45);
  --glass-blur: blur(14px);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.45);
  --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.5);

  /* Typography & Text */
  --text-pure: #ffffff;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-accent: #2dd4bf;

  /* Layout & Sizing */
  --max-width: 1240px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.65;
  font-size: 16px;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 10% 8%, rgba(20, 184, 166, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 20%, rgba(13, 148, 136, 0.06) 0%, transparent 45%),
    radial-gradient(circle at 50% 65%, rgba(15, 118, 110, 0.04) 0%, transparent 50%);
  background-attachment: fixed;
}

/* Subtle Medical Grid Watermark */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-size: 40px 40px;
  background-image: 
    linear-gradient(to right, rgba(148, 163, 184, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(148, 163, 184, 0.025) 1px, transparent 1px);
  pointer-events: none;
  z-index: 0;
}

/* Containers & Wrappers */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

section {
  padding: 5rem 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.07);
}

/* Typography Utilities */
h1, h2, h3, h4 {
  font-family: 'Outfit', 'Plus Jakarta Sans', system-ui, sans-serif;
  color: var(--text-pure);
  font-weight: 700;
  line-height: 1.25;
}

p {
  color: var(--text-muted);
}

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

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

code, pre {
  font-family: 'JetBrains Mono', Consolas, Monaco, monospace;
}

/* Section Header Component */
.section-header {
  margin-bottom: 2.75rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  background: var(--med-teal-subtle);
  border: 1px solid var(--med-teal-border);
  color: var(--med-teal-light);
  margin-bottom: 0.85rem;
}

.section-tag.tag-red {
  background: var(--med-red-subtle);
  border-color: var(--med-red-border);
  color: var(--med-red-light);
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 0.65rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 780px;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.site-nav {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(8, 15, 29, 0.85);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-normal);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.nav-logo-mark {
  width: 38px;
  height: 38px;
  background: var(--med-teal-dark);
  border: 1px solid var(--med-teal-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-pure);
  box-shadow: 0 0 12px rgba(20, 184, 166, 0.25);
}

.nav-brand-text {
  display: flex;
  flex-direction: column;
}

.nav-brand-name {
  font-family: 'Outfit', sans-serif;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text-pure);
}

.nav-brand-sub {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-pure);
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.95rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--glass-border);
  color: var(--text-main);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.nav-btn:hover {
  background: var(--med-teal-subtle);
  border-color: var(--med-teal-light);
  color: var(--text-pure);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding: 4.5rem 0 4rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 3rem;
  align-items: center;
}

.hero-badge-top {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  background: rgba(220, 38, 38, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 1.25rem;
}

.hero-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--med-red);
  box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7);
  animation: pulse-red 2s infinite;
}

@keyframes pulse-red {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(239, 68, 68, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}

.hero-title span {
  color: var(--med-teal-light);
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  line-height: 1.4;
}

.hero-summary {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.25rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--med-teal);
  color: var(--text-pure);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--med-teal-light);
  box-shadow: 0 4px 16px rgba(13, 148, 136, 0.35);
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  background: var(--med-teal-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(13, 148, 136, 0.5);
  color: var(--text-pure);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-card);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--glass-border-hover);
  color: var(--text-pure);
  transform: translateY(-2px);
}

/* Metadata Chips Bar */
.hero-meta-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.meta-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-family: 'JetBrains Mono', monospace;
  background: rgba(15, 27, 49, 0.6);
  border: 1px solid var(--glass-border);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

.meta-chip strong {
  color: var(--text-main);
}

/* Hero Visual Card */
.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
}

.hero-card-img-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  aspect-ratio: 16 / 10;
  background: #060b13;
  border: 1px solid rgba(148, 163, 184, 0.1);
  margin-bottom: 1.25rem;
}

.hero-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-normal);
}

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

.hero-card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.25rem 1rem 0.75rem;
  background: linear-gradient(to top, rgba(7, 13, 24, 0.95), transparent);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.hero-card-caption {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-pure);
}

.hero-card-specs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
}

.spec-mini-box {
  background: rgba(8, 16, 31, 0.7);
  border: 1px solid rgba(148, 163, 184, 0.08);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  text-align: center;
}

.spec-mini-val {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--med-teal-light);
}

.spec-mini-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  color: var(--text-dim);
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-top: 0.2rem;
}

/* ==========================================================================
   The Panic Gap Section
   ========================================================================== */
.panic-gap-section {
  background: linear-gradient(180deg, transparent, rgba(12, 21, 39, 0.4), transparent);
}

.challenge-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.challenge-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  backdrop-filter: var(--glass-blur);
  position: relative;
  display: flex;
  flex-direction: column;
}

.challenge-card.passive {
  border-top: 3px solid var(--med-red);
}

.challenge-card.visor {
  border-top: 3px solid var(--med-teal);
}

.card-header-badge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.card-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
}

.card-badge.badge-danger {
  background: var(--med-red-subtle);
  color: var(--med-red-light);
  border: 1px solid var(--med-red-border);
}

.card-badge.badge-success {
  background: var(--med-teal-subtle);
  color: var(--med-teal-light);
  border: 1px solid var(--med-teal-border);
}

.card-h3 {
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
}

.challenge-list {
  list-style: none;
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.challenge-list li {
  display: flex;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.challenge-list li svg {
  flex-shrink: 0;
  margin-top: 0.2rem;
}

/* Panic Gap Timeline Banner */
.panic-timeline-box {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  backdrop-filter: var(--glass-blur);
}

.timeline-flex {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.timeline-img-wrap {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  background: #040811;
  padding: 0.5rem;
}

.timeline-img-wrap img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-sm);
}

.timeline-content h4 {
  font-size: 1.3rem;
  margin-bottom: 0.75rem;
}

.timeline-steps {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.timeline-step {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  background: rgba(11, 20, 37, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.08);
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
}

.step-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--med-teal-light);
  background: var(--med-teal-subtle);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  flex-shrink: 0;
}

.step-text {
  font-size: 0.875rem;
  color: var(--text-main);
}

/* ==========================================================================
   Video Demonstration Section
   ========================================================================== */
.video-section {
  position: relative;
}

.video-container-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-shadow);
}

.video-player-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #000;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.12);
}

.video-player-wrapper video {
  width: 100%;
  display: block;
  max-height: 580px;
  outline: none;
}

.video-timeline-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1.75rem;
}

.video-phase-card {
  background: rgba(8, 17, 33, 0.65);
  border: 1px solid rgba(148, 163, 184, 0.08);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.phase-time {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--med-teal-light);
  margin-bottom: 0.35rem;
}

.phase-title {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-pure);
  margin-bottom: 0.25rem;
}

.phase-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* ==========================================================================
   Hardware & Mechatronics Gallery
   ========================================================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.5rem;
}

.gallery-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: var(--glass-blur);
  transition: all var(--transition-normal);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.gallery-card:hover {
  transform: translateY(-4px);
  border-color: var(--glass-border-hover);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.6);
}

.gallery-img-wrap {
  aspect-ratio: 16 / 11;
  background: #060c18;
  overflow: hidden;
  position: relative;
}

.gallery-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-normal);
}

.gallery-card:hover .gallery-img-wrap img {
  transform: scale(1.04);
}

.gallery-zoom-badge {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: rgba(11, 20, 37, 0.75);
  backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  color: var(--text-main);
  padding: 0.35rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.gallery-card:hover .gallery-zoom-badge {
  opacity: 1;
}

.gallery-info {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.gallery-tag {
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--med-teal-light);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.gallery-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.45rem;
  color: var(--text-pure);
}

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

/* Mechanical Rationale Banner */
.rationale-banner {
  margin-top: 2.5rem;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.rationale-item h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--text-pure);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.rationale-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Dual-Microcontroller Architecture
   ========================================================================== */
.arch-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
  margin-bottom: 2.5rem;
}

.arch-node {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  backdrop-filter: var(--glass-blur);
  position: relative;
  overflow: hidden;
}

.arch-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
}

.arch-node.pi::before {
  background: linear-gradient(90deg, #be185d, var(--med-teal));
}

.arch-node.arduino::before {
  background: linear-gradient(90deg, #0d9488, #0284c7);
}

.node-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.25rem;
}

.node-title {
  font-size: 1.5rem;
}

.node-chip {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  color: var(--text-muted);
}

.node-specs {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-top: 1.25rem;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.08);
  font-size: 0.85rem;
}

.spec-key {
  color: var(--text-dim);
}

.spec-val {
  color: var(--text-main);
  font-weight: 500;
  text-align: right;
}

/* Serial Bridge Protocol Card */
.protocol-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  backdrop-filter: var(--glass-blur);
}

.protocol-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.protocol-flow-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: center;
}

.flow-packet {
  background: var(--bg-code);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-family: 'JetBrains Mono', monospace;
}

.packet-label {
  font-size: 0.72rem;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.packet-code {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--med-teal-light);
}

.packet-explain {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  font-family: 'Inter', sans-serif;
}

.flow-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  font-weight: 600;
}

/* ==========================================================================
   Interactive Code Showcase
   ========================================================================== */
.code-viewer-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-shadow);
}

.code-tabs-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(9, 17, 32, 0.9);
  border-bottom: 1px solid var(--glass-border);
  padding: 0.5rem 1rem;
  overflow-x: auto;
}

.tabs-list {
  display: flex;
  gap: 0.4rem;
}

.code-tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.code-tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.04);
}

.code-tab-btn.active {
  color: var(--med-teal-light);
  background: var(--med-teal-subtle);
  border-color: var(--med-teal-border);
  font-weight: 600;
}

.copy-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  color: var(--text-muted);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: var(--med-teal-subtle);
  color: var(--med-teal-light);
  border-color: var(--med-teal-border);
}

.code-panel {
  display: none;
  background: var(--bg-code);
  padding: 1.5rem;
  overflow-x: auto;
  max-height: 520px;
}

.code-panel.active {
  display: block;
}

.code-panel pre {
  margin: 0;
  line-height: 1.55;
  font-size: 0.875rem;
  color: #e2e8f0;
}

/* Syntax Highlighting Colors (Medical Slate) */
.c-kw { color: #2dd4bf; font-weight: 600; } /* teal keywords */
.c-fn { color: #38bdf8; } /* cyan functions */
.c-st { color: #a7f3d0; } /* light sage strings */
.c-cm { color: #64748b; font-style: italic; } /* slate comments */
.c-ty { color: #f472b6; } /* type names */
.c-nm { color: #facc15; } /* numbers */

/* ==========================================================================
   Diagnostic Verification & Telemetry
   ========================================================================== */
.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.telemetry-kpi {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  backdrop-filter: var(--glass-blur);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast);
}

.telemetry-kpi:hover {
  transform: translateY(-2px);
  border-color: var(--glass-border-hover);
}

.telemetry-kpi::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--kpi-accent, var(--med-teal));
}

.kpi-title {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.kpi-metric {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--text-pure);
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.kpi-subtext {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Diagnostic Test Accordion */
.test-suite-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  backdrop-filter: var(--glass-blur);
}

.test-suite-header {
  padding: 1.25rem 1.75rem;
  background: rgba(10, 18, 33, 0.85);
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.test-accordion-item {
  border-bottom: 1px solid rgba(148, 163, 184, 0.08);
}

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

.accordion-trigger {
  width: 100%;
  background: transparent;
  border: none;
  padding: 1.25rem 1.75rem;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  color: var(--text-main);
  transition: background var(--transition-fast);
}

.accordion-trigger:hover {
  background: rgba(255, 255, 255, 0.025);
}

.acc-title-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.acc-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
}

.acc-badge.pass {
  background: var(--med-emerald-subtle);
  color: var(--med-emerald-light);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.acc-badge.cond {
  background: var(--med-amber-subtle);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.acc-heading {
  font-weight: 600;
  font-size: 1.05rem;
}

.acc-icon {
  transition: transform var(--transition-fast);
  color: var(--text-dim);
}

.test-accordion-item.open .acc-icon {
  transform: rotate(180deg);
}

.accordion-content {
  display: none;
  padding: 0 1.75rem 1.75rem;
}

.test-accordion-item.open .accordion-content {
  display: block;
}

.acc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin-top: 0.5rem;
}

.acc-table th {
  text-align: left;
  padding: 0.65rem 0.85rem;
  color: var(--text-dim);
  border-bottom: 1px solid rgba(148, 163, 184, 0.12);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
}

.acc-table td {
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.06);
  color: var(--text-muted);
}

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

/* ==========================================================================
   Documentation Downloads
   ========================================================================== */
.docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  backdrop-filter: var(--glass-blur);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

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

.doc-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.doc-icon-box {
  width: 46px;
  height: 46px;
  background: var(--med-teal-subtle);
  border: 1px solid var(--med-teal-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--med-teal-light);
  flex-shrink: 0;
}

.doc-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.doc-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.doc-meta-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid rgba(148, 163, 184, 0.08);
  margin-bottom: 1.25rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.doc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  color: var(--text-pure);
  font-size: 0.875rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.doc-btn:hover {
  background: var(--med-teal-subtle);
  border-color: var(--med-teal-border);
  color: var(--med-teal-light);
}

/* ==========================================================================
   Lightbox Modal Component
   ========================================================================== */
.lightbox-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(4, 9, 18, 0.92);
  backdrop-filter: blur(16px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

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

.lightbox-dialog {
  max-width: 1000px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  position: relative;
}

.lightbox-close-btn {
  position: absolute;
  top: -2.5rem;
  right: 0;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.lightbox-close-btn:hover {
  color: var(--text-pure);
}

.lightbox-img-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.lightbox-caption {
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  padding: 4rem 0 3rem;
  background: #050a14;
  border-top: 1px solid rgba(148, 163, 184, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand h4 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-muted);
  max-width: 400px;
}

.footer-col h5 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--med-teal-light);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(148, 163, 184, 0.06);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .arch-grid, .timeline-flex, .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .protocol-flow-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .rationale-banner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .challenge-grid {
    grid-template-columns: 1fr;
  }
  .video-timeline-bar {
    grid-template-columns: 1fr 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}