/* ========================================
   Design System & Variables
   ======================================== */
:root {
  /* Colors */
  --color-primary: #dc2626;
  --color-primary-dark: #991b1b;
  --color-white: #ffffff;
  --color-black: #000000;
  --color-overlay: rgba(0, 0, 0, 0.5);
  --color-glass: rgba(0, 0, 0, 0.4);
  --color-glass-border: rgba(255, 255, 255, 0.1);
  --color-text: rgba(255, 255, 255, 0.9);
  --color-text-muted: rgba(255, 255, 255, 0.6);

  /* Light section */
  --color-surface: #f5f6f8;
  --color-surface-2: #ffffff;
  --color-ink: #0b0b0f;
  --color-ink-muted: rgba(11, 11, 15, 0.62);
  --color-border-soft: rgba(11, 11, 15, 0.10);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Transitions */
  --ease-out: cubic-bezier(0.33, 1, 0.68, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 0.2s;
  --duration-normal: 0.35s;
  --duration-slow: 0.6s;
  --duration-page: 0.8s;

  /* Layout */
  --navbar-height: 72px;
  --border-radius: 12px;
  --border-radius-sm: 6px;
  --border-radius-md: 16px;
  --border-radius-full: 9999px;
}

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

html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-regular);
  background: var(--color-black);
  color: var(--color-white);
  overflow: hidden;
  height: 100vh;
}

button { font-family: inherit; cursor: pointer; border: none; background: none; }
a { color: inherit; text-decoration: none; }

/* ========================================
   Navbar
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
}

.back-btn {
  position: absolute;
  left: var(--space-xl);
  display: none;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  color: var(--color-white);
  font-size: 14px;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.5px;
  border: 1px solid var(--color-glass-border);
  border-radius: var(--border-radius-full);
  transition: all var(--duration-fast) var(--ease-out);
}

.back-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateX(-2px);
}

.back-btn.visible { display: flex; }

.nav-links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
  padding: var(--space-sm) 0;
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-white);
  transition: width var(--duration-normal) var(--ease-out);
}

.nav-links a:hover { color: var(--color-white); }
.nav-links a:hover::after { width: 100%; }

/* ========================================
   Split Screen (Home)
   ======================================== */
.split-container { display: flex; width: 100vw; height: 100vh; }

.split-panel {
  position: relative;
  flex: 1 1 50%;
  min-width: 0;
  height: 100%;
  overflow: hidden;
  cursor: pointer;
  background-size: cover;
  background-position: center;
  transition: flex var(--duration-page) var(--ease-in-out);
}

.split-panel:first-child {
  background-image: url('https://ichef.bbci.co.uk/ace/standard/3840/cpsprodpb/cea1/live/1de105b0-f5a5-11ef-bcea-7b70a14a5556.jpg');
}

.split-panel:last-child {
  background-image: url('https://cdn.britannica.com/88/244788-050-D0815591/Simone-Biles-on-balance-beam-2020-Tokyo-Olympic-Games.jpg');
}

.split-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  transition: background var(--duration-normal) var(--ease-out);
}

.split-panel:first-child .split-overlay {
  background: rgba(0, 0, 0, 0.6);
}

.split-title {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: var(--font-weight-light);
  letter-spacing: 4px;
  text-transform: uppercase;
  white-space: nowrap;
  z-index: 1;
  transition: transform var(--duration-normal) var(--ease-spring);
}

.split-container:not(.locked):not(.transitioning) .split-panel:hover { flex: 1.8 1 0%; }
.split-container:not(.locked):not(.transitioning) .split-panel:not(:hover) { flex: 0.6 1 0%; }
.split-container:not(.locked):not(.transitioning) .split-panel:hover .split-overlay { background: rgba(0, 0, 0, 0.25); }
.split-container:not(.locked):not(.transitioning) .split-panel:first-child:hover .split-overlay { background: rgba(0, 0, 0, 0.4); }
.split-container:not(.locked):not(.transitioning) .split-panel:hover .split-title {
  transform: translate(-50%, -50%) scale(1.08);
}

/* Transition States */
.split-panel.expanding { flex: 100 1 0% !important; z-index: 10; }
.split-panel.collapsing { flex: 0 1 0% !important; }
.split-panel.collapsing .split-title { opacity: 0; }

.split-container.locked .split-panel.expanded { flex: 100 1 0% !important; }
.split-container.locked .split-panel.collapsed { flex: 0 1 0% !important; }

/* ========================================
   Pages
   ======================================== */
.page {
  position: fixed;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  overflow-y: auto;
  z-index: 100;
  transition: opacity var(--duration-normal) var(--ease-out),
              visibility 0s linear var(--duration-normal);
}

.page.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  z-index: 200;
  transition: opacity var(--duration-normal) var(--ease-out),
              visibility 0s linear 0s;
}

#f1-page {
  background-image: url('https://ichef.bbci.co.uk/ace/standard/3840/cpsprodpb/cea1/live/1de105b0-f5a5-11ef-bcea-7b70a14a5556.jpg');
  --scroll-progress: 100;
}

#gymnastics-page {
  background-image: url('https://cdn.britannica.com/88/244788-050-D0815591/Simone-Biles-on-balance-beam-2020-Tokyo-Olympic-Games.jpg');
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--navbar-height) var(--space-xl) var(--space-2xl);
  text-align: center;
  z-index: 2;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-overlay);
  z-index: -1;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: var(--font-weight-light);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
  animation: fadeUp 0.8s var(--ease-out) both;
}

.hero-text {
  font-size: clamp(1rem, 2vw, 1.35rem);
  font-weight: var(--font-weight-light);
  color: var(--color-text-muted);
  max-width: 600px;
  line-height: 1.7;
  animation: fadeUp 0.8s var(--ease-out) 0.1s both;
}

.scroll-cta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
  padding: var(--space-sm) var(--space-md);
  font-size: 13px;
  font-weight: var(--font-weight-medium);
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-text-muted);
  border-radius: var(--border-radius-full);
  transition: all var(--duration-fast) var(--ease-out);
  animation: fadeUp 0.8s var(--ease-out) 0.2s both;
}

.scroll-cta:hover { color: var(--color-white); background: rgba(255, 255, 255, 0.1); }
.scroll-cta svg { animation: bounce 2s ease-in-out infinite; }

@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(4px); } }

/* ========================================
   Scroll Experience
   ======================================== */
.scroll-track { position: relative; height: 600vh; }
.scroll-sticky { position: sticky; top: 0; height: 100vh; overflow: hidden; }

.scroll-overlay {
  position: absolute;
  inset: 0;
  background: var(--color-overlay);
  z-index: 1;
}

.scroll-fill {
  position: absolute;
  inset: 0;
  background: var(--color-primary);
  transform: translateY(calc(var(--scroll-progress) * 1%));
  transition: transform 0.1s linear;
  z-index: 2;
}

.scroll-steps {
  position: absolute;
  inset: 0;
  z-index: 3;
  padding: var(--navbar-height) var(--space-xl);
}

.step {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  visibility: hidden;
  pointer-events: none;
}

.step.active { visibility: visible; pointer-events: auto; }

.step-content {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
  padding: 0 5vw;
  max-width: 1200px;
  transform: translateY(16px);
  transition: transform var(--duration-normal) var(--ease-out);
}

.step.active .step-content { transform: translateY(0); }

.step-content.left { flex-direction: row; }
.step-content.right { flex-direction: row-reverse; text-align: right; }

.step-orb {
  flex-shrink: 0;
  width: clamp(180px, 20vw, 280px);
  height: clamp(180px, 20vw, 280px);
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%,
    rgba(255, 150, 150, 0.3),
    rgba(255, 100, 100, 0.15) 50%,
    transparent 70%);
  box-shadow: 0 0 60px rgba(255, 100, 100, 0.2),
              inset 0 0 40px rgba(255, 255, 255, 0.05);
}

.step-text {
  max-width: 500px;
  background: rgba(0, 0, 0, 0.55);
  padding: var(--space-lg) var(--space-xl);
  border-radius: var(--border-radius-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.step-kicker {
  display: inline-block;
  font-size: 11px;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-primary);
  background: rgba(255, 255, 255, 0.95);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--space-sm);
}
.step-text h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: var(--font-weight-light);
  letter-spacing: 1px;
  margin-bottom: var(--space-md);
  color: rgba(255, 255, 255, 1);
}
.step-text p {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  font-weight: var(--font-weight-normal);
  color: rgba(255, 255, 255, 0.88);
  line-height: 1.8;
}

.step-diagram {
  display: block;
  max-width: 100%;
  margin-top: 1.2rem;
  border-radius: 10px;
}

.step-ref {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  font-weight: var(--font-weight-light);
  color: rgba(255, 255, 255, 0.7);
}

.step-ref a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ========================================
   Timeline Section
   ======================================== */
.timeline-section {
  position: relative;
  z-index: 2;
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  padding: var(--space-3xl) 0;
}

.timeline-header {
  text-align: center;
  padding: 0 var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.timeline-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: var(--font-weight-light);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.timeline-subtitle {
  font-size: 14px;
  font-weight: var(--font-weight-regular);
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.timeline-scroll {
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
  cursor: grab;
  padding: var(--space-lg) 0;
  scrollbar-width: none;
  -ms-overflow-style: none;
  scroll-snap-type: x proximity;
  overscroll-behavior-x: contain;
}

.timeline-scroll::-webkit-scrollbar { display: none; }
.timeline-scroll.dragging { cursor: grabbing; scroll-snap-type: none; }

.timeline-track {
  display: flex;
  gap: 0;
  padding-left: max(var(--space-2xl), 8vw);
  padding-right: max(var(--space-2xl), 8vw);
  position: relative;
  min-height: 480px;
  align-items: center;
}

/* Timeline line - spans full track width with faded ends */
.timeline-line {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  transform: translateY(-50%);
  pointer-events: none;
  z-index: 0;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.28) 120px,
    rgba(255, 255, 255, 0.28) calc(100% - 120px),
    rgba(255, 255, 255, 0) 100%
  );
}

.timeline-card {
  flex: 0 0 320px;
  height: 380px;
  display: flex;
  padding: 0 var(--space-md);
  scroll-snap-align: center;
  position: relative;
  z-index: 1;
}

.timeline-card:last-of-type { scroll-snap-align: end; }

.timeline-card:nth-child(odd) { align-items: flex-start; padding-top: var(--space-lg); }
.timeline-card:nth-child(even) { align-items: flex-end; padding-bottom: var(--space-lg); }

.card-content {
  background: var(--color-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  transition: transform var(--duration-normal) var(--ease-out),
              background var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}

.timeline-card:nth-child(odd) .card-content:hover { transform: translateY(-6px); }
.timeline-card:nth-child(even) .card-content:hover { transform: translateY(6px); }

.card-content:hover {
  background: rgba(0, 0, 0, 0.55);
  border-color: rgba(255, 255, 255, 0.2);
}

.card-year {
  display: inline-block;
  align-self: flex-start;
  padding: var(--space-xs) var(--space-md);
  font-size: 13px;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 2px;
  color: var(--color-primary);
  background: var(--color-white);
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--space-md);
}

.card-title {
  font-size: 1.1rem;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.5px;
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.card-text {
  font-size: 14px;
  font-weight: var(--font-weight-light);
  color: var(--color-text-muted);
  line-height: 1.7;
  flex-grow: 1;
}

.card-cta {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
}

.card-cta-line {
  flex-grow: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.15);
  transition: background var(--duration-fast) var(--ease-out);
}

.card-cta-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-white);
  border: 3px solid var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
  transition: transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-fast) var(--ease-out);
}

.card-cta-text {
  font-size: 11px;
  font-weight: var(--font-weight-medium);
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-text-muted);
  transition: color var(--duration-fast) var(--ease-out);
}

.card-content:hover .card-cta-line { background: rgba(255, 255, 255, 0.25); }
.card-content:hover .card-cta-dot { transform: scale(1.25); box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.2); }
.card-content:hover .card-cta-text { color: var(--color-white); }

/* Timeline Navigation */
.timeline-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.timeline-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(0, 0, 0, 0.2);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-fast) var(--ease-out);
}

.timeline-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
  transform: scale(1.08);
}

.timeline-btn:active:not(:disabled) { transform: scale(0.95); }
.timeline-btn:disabled { opacity: 0.3; cursor: not-allowed; }

/* ========================================
   Reference Section (polished)
   ======================================== */
.reference-section {
  padding: clamp(56px, 8vw, 96px) 0 clamp(40px, 6vw, 72px);
  background: radial-gradient(1200px 600px at 50% 0%,
    rgba(220, 38, 38, 0.05),
    transparent 55%),
    #ffffff;
  border-top: 1px solid rgba(11, 11, 15, 0.08);
}

.reference-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.reference-header {
  text-align: center;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.reference-title {
  font-size: clamp(1.5rem, 3.2vw, 2.15rem);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 10px;
  color: #0b0b0f;
}

.reference-subtitle {
  font-size: 14px;
  font-weight: var(--font-weight-regular);
  color: rgba(11, 11, 15, 0.62);
  letter-spacing: 0.6px;
}

/* Grid */
.reference-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: clamp(14px, 2.2vw, 20px);
  align-items: stretch;
}

/* Card */
.reference-category {
  background: rgba(245, 246, 248, 0.9);
  border: 1px solid rgba(11, 11, 15, 0.10);
  border-radius: 18px;
  padding: 18px 18px 16px;
  box-shadow: 0 12px 40px rgba(11, 11, 15, 0.06);
  transition: transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out);
  display: flex;
  flex-direction: column;
  min-height: 320px; /* keeps cards visually balanced */
}

.reference-category:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 60px rgba(11, 11, 15, 0.10);
  border-color: rgba(11, 11, 15, 0.18);
}

.reference-category-title {
  font-size: 12px;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: #0b0b0f;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(11, 11, 15, 0.12);
}

/* List becomes scrollable if long (e.g., Vault) */
.reference-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 0;

  /* makes Vault not stretch the whole page */
  flex: 1;
  overflow: auto;
  padding-right: 6px; /* room for scrollbar */
}

/* subtle scrollbar */
.reference-list::-webkit-scrollbar { width: 6px; }
.reference-list::-webkit-scrollbar-thumb {
  background: rgba(11, 11, 15, 0.18);
  border-radius: 999px;
}
.reference-list::-webkit-scrollbar-track { background: transparent; }

.reference-item {
  font-size: 13.5px;
  font-weight: var(--font-weight-regular);
  color: rgba(11, 11, 15, 0.78);
  line-height: 1.7;
  padding-left: 12px;
  border-left: 3px solid rgba(220, 38, 38, 0.18);
  transition: border-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

.reference-item:hover {
  border-left-color: rgba(220, 38, 38, 0.55);
  color: rgba(11, 11, 15, 0.92);
}

.reference-item em {
  font-style: italic;
  color: rgba(11, 11, 15, 0.92);
}

/* Links: readable + wrap cleanly */
.reference-item a {
  color: rgba(220, 38, 38, 0.95);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;

  /* prevents ugly overflow on long URLs */
  overflow-wrap: anywhere;
  word-break: normal;
}

.reference-item a:hover {
  color: #991b1b;
  text-decoration-thickness: 2px;
}

/* Responsive tweaks */
@media (max-width: 560px) {
  .reference-category { min-height: 0; }
  .reference-list { max-height: none; overflow: visible; padding-right: 0; }
}


/* ========================================
   Light info section
   ======================================== */
.info-section {
  position: relative;
  z-index: 2;
  background: #ffffff;
  color: var(--color-ink);
  padding: clamp(40px, 6vw, 80px) 0 0 0;
}

.info-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.info-header { text-align: center; margin-bottom: clamp(24px, 4vw, 40px); }

.info-title {
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  font-weight: 500;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.info-subtitle {
  max-width: 720px;
  margin: 0 auto;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-ink-muted);
}

.info-graphic {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-soft);
  border-radius: 18px;
  padding: clamp(18px, 3vw, 28px);
  box-shadow: 0 18px 60px rgba(11, 11, 15, 0.08);
  margin: 0 auto;
}

.info-points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-lg);
  margin-top: clamp(20px, 3vw, 34px);
}

.info-point {
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--color-border-soft);
  border-radius: 16px;
  padding: var(--space-lg);
}

.info-point h3 {
  font-size: 14px;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-sm);
}

.info-point p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-ink-muted);
}

/* ========================================
   Modal
   ======================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--navbar-height) + var(--space-lg)) var(--space-lg) var(--space-lg);
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out),
              visibility 0s linear var(--duration-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity var(--duration-normal) var(--ease-out),
              visibility 0s linear 0s;
}

.modal {
  position: relative;
  width: 100%;
  max-width: 640px;
  max-height: 85vh;
  background: linear-gradient(160deg,
    rgba(50, 10, 15, 0.95),
    rgba(20, 5, 8, 0.98));
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  padding: var(--space-2xl);
  overflow-y: auto;
  box-shadow: 0 25px 80px rgba(0, 0, 0, 0.5),
              0 0 100px rgba(220, 38, 38, 0.1);
  transform: translateY(24px) scale(0.96);
  opacity: 0;
  transition: transform 0.4s var(--ease-spring),
              opacity var(--duration-normal) var(--ease-out);
}

.modal-overlay.active .modal { transform: translateY(0) scale(1); opacity: 1; }

.modal-close {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.7);
  display: grid;
  place-items: center;
  transition: all var(--duration-fast) var(--ease-out);
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-white);
  transform: rotate(90deg);
}

.modal-header { padding-right: var(--space-2xl); margin-bottom: var(--space-lg); }

.modal-year {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  font-size: 14px;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 2px;
  color: var(--color-primary);
  background: var(--color-white);
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--space-md);
}

.modal-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: var(--font-weight-light);
  letter-spacing: 0.5px;
  line-height: 1.3;
}

.modal-body { position: relative; padding-top: var(--space-lg); }
.modal-body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  border-radius: 2px;
}

.modal-text {
  font-size: 15px;
  font-weight: var(--font-weight-light);
  color: var(--color-text);
  line-height: 1.9;
  white-space: pre-line;
}

.modal-text .katex { font-size: 1.15em; color: #fff; }
.step-text .katex { font-size: 1.1em; color: #fff; }
.step-text .katex-display {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  padding: 0.8rem 1.2rem;
  margin: 1rem 0;
}

.modal-text img,
.modal-image {
  display: block;
  max-width: 100%;
  height: auto;
  margin: var(--space-lg) 0;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.modal-image--contained {
  max-height: 350px;
  width: auto;
  max-width: 80%;
  object-fit: contain;
  margin-left: auto;
  margin-right: auto;
}

.modal::-webkit-scrollbar { width: 4px; }
.modal::-webkit-scrollbar-track { background: rgba(255, 255, 255, 0.05); }
.modal::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.2); border-radius: 2px; }

/* Engine image toggle */
.engine-toggle {
  cursor: pointer;
  margin: var(--space-lg) 0;
}

.engine-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 5 / 2;
  background: rgba(0, 0, 0, 0.4);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.engine-toggle .engine-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;          /* THIS is the important change */
  object-position: center;    /* keep car centred */
  margin: 0;
  border-radius: 0;
  box-shadow: none;
  transition: opacity 0.5s ease;
}

/* Ferrari (front-engine image) — move crop slightly right */
.engine-img--front {
  object-position: 63% 50%;
}

ref{
  text-decoration: underline;
}

/* Lotus (rear-engine image) — slightly lower to keep body centred */
.engine-img--rear {
  object-position: 50% 60%;
}


.engine-toggle .engine-img--front { opacity: 1; }
.engine-toggle .engine-img--rear { opacity: 0; }

.engine-toggle.active .engine-img--front { opacity: 0; }
.engine-toggle.active .engine-img--rear { opacity: 1; }

/* Captions grid: both sets overlap, only opacity changes */
.engine-captions {
  display: grid;
  margin-top: var(--space-sm);
  position: relative;
}

.engine-caption-set {
  grid-row: 1;
  grid-column: 1;
  text-align: center;
  transition: opacity 0.4s ease;
}

.engine-caption-set--front { opacity: 1; pointer-events: auto; }
.engine-caption-set--rear  { opacity: 0; pointer-events: none; }

.engine-toggle.active .engine-caption-set--front { opacity: 0; pointer-events: none; }
.engine-toggle.active .engine-caption-set--rear  { opacity: 1; pointer-events: auto; }

.engine-label {
  display: block;
  font-size: 13px;
  font-weight: var(--font-weight-semibold);
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.5px;
}

.engine-ref {
  display: block;
  font-size: 13px;
  font-weight: var(--font-weight-light);
  color: rgba(255, 255, 255, 0.5);
  margin-top: 4px;
}

.engine-ref a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
}

.engine-ref a:hover {
  color: rgba(255, 255, 255, 0.9);
}

/* Generic image toggle (reusable for any before/after comparison) */
.img-toggle {
  cursor: pointer;
  margin: var(--space-lg) 0;
}

.img-toggle-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: rgba(0, 0, 0, 0.4);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.img-toggle-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  margin: 0;
  border-radius: 0;
  box-shadow: none;
  transition: opacity 0.5s ease;
}

.img-toggle-img--front { opacity: 1; }
.img-toggle-img--rear { opacity: 0; }

.img-toggle.active .img-toggle-img--front { opacity: 0; }
.img-toggle.active .img-toggle-img--rear { opacity: 1; }

.img-toggle-captions {
  display: grid;
  margin-top: var(--space-sm);
  position: relative;
}

.img-toggle-caption {
  grid-row: 1;
  grid-column: 1;
  text-align: center;
  transition: opacity 0.4s ease;
}

.img-toggle-caption--front { opacity: 1; pointer-events: auto; }
.img-toggle-caption--rear  { opacity: 0; pointer-events: none; }

.img-toggle.active .img-toggle-caption--front { opacity: 0; pointer-events: none; }
.img-toggle.active .img-toggle-caption--rear  { opacity: 1; pointer-events: auto; }

.img-toggle-label {
  display: block;
  font-size: 13px;
  font-weight: var(--font-weight-semibold);
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.5px;
}

.img-toggle-ref {
  display: block;
  font-size: 13px;
  font-weight: var(--font-weight-light);
  color: rgba(255, 255, 255, 0.5);
  margin-top: 4px;
}

.img-toggle-ref a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
}

.img-toggle-ref a:hover {
  color: rgba(255, 255, 255, 0.9);
}

/* ========================================
   Gymnastics Page Styles (Blue Theme)
   ======================================== */
#gymnastics-page {
  --gym-primary: #0066ff;
  --gym-primary-dark: #0047b3;
  --scroll-progress: 100;
}

.gym-hero::before {
  background: rgba(0, 0, 0, 0.55);
}

.gym-cta:hover {
  color: var(--color-white);
  background: rgba(0, 102, 255, 0.2);
}

/* Gymnastics Scroll Experience */
.gym-scroll-track {
  position: relative;
  height: 600vh;
}

.gym-scroll-track .scroll-fill {
  background: #0066ff !important;
  transform: translateY(calc(var(--scroll-progress) * 1%));
}

.gym-fill {
  background: #0066ff !important;
}

.gym-orb {
  background: radial-gradient(circle at 30% 30%,
    rgba(100, 150, 255, 0.3),
    rgba(0, 102, 255, 0.15) 50%,
    transparent 70%) !important;
  box-shadow: 0 0 60px rgba(0, 102, 255, 0.2),
              inset 0 0 40px rgba(255, 255, 255, 0.05) !important;
}

.gym-text {
  background: rgba(0, 0, 0, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.gym-kicker {
  color: #0066ff !important;
  background: rgba(255, 255, 255, 0.95);
}

/* Make gym steps use the same base step styling */
.gym-step {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  visibility: hidden;
  pointer-events: none;
}

.gym-step.active {
  visibility: visible;
  pointer-events: auto;
}

.gym-step.active .step-content {
  transform: translateY(0);
}

.gym-reference {
  background: linear-gradient(180deg, #0066ff 0%, #0047b3 100%);
}

/* ========================================
   Backflip 3D Viewer Styles
   ======================================== */
.flip-viewer-section {
  position: relative;
  background: #faf8f5;
}

.flip-viewer-container {
  position: relative;
  height: 1000vh;
}

.flip-canvas-container {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: #faf8f5;
}

.flip-progress-bar {
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  height: 3px;
  background: #0066ff;
  width: 0%;
  z-index: 101;
  transition: width 0.15s ease-out, opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 0;
}

.flip-progress-bar.visible {
  opacity: 1;
}

.flip-text-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  pointer-events: none;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 0 4rem;
}

.flip-text-block {
  position: absolute;
  left: 4rem;
  max-width: 420px;
  opacity: 0;
  transform: translateY(40px);
  filter: blur(4px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), 
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              filter 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 1.5rem 2rem;
  border-radius: 16px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

.flip-text-block.visible {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}

.flip-text-content {
  font-size: 1.15rem;
  line-height: 1.7;
  color: #2d2d2d;
  font-weight: 400;
  letter-spacing: -0.01em;
}

.flip-text-content strong {
  font-weight: 600;
  color: #0066ff;
}

.flip-info-panel {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  display: flex;
  gap: 2rem;
  padding: 0.875rem 1.5rem;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 100px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1), 
              visibility 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.flip-info-panel.visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.flip-info-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: #555555;
}

.flip-info-item strong {
  color: #2d2d2d;
  font-weight: 500;
}

.flip-tooltip {
  position: fixed;
  bottom: 6rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.75rem 1rem;
  background: #2d2d2d;
  color: white;
  font-size: 0.75rem;
  border-radius: 8px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 100;
}

.flip-tooltip.show {
  opacity: 1;
  visibility: visible;
}

/* Flip viewer loading state */
.flip-loader {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #faf8f5;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.flip-loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.flip-loader-spinner {
  width: 48px;
  height: 48px;
  border: 2px solid rgba(0, 0, 0, 0.1);
  border-top-color: #0066ff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.flip-loader-text {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: #555555;
  font-weight: 400;
}

/* Responsive flip text positioning */
@media (max-width: 1024px) {
  .flip-text-overlay {
    padding: 0 2rem;
    align-items: flex-end;
    padding-bottom: 8rem;
  }
  
  .flip-text-block {
    left: 2rem;
    right: 2rem;
    max-width: none;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1.25rem 1.5rem;
    border-radius: 14px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    filter: none;
  }
  
  .flip-text-block.visible {
    filter: none;
  }
  
  .flip-text-content {
    font-size: 1rem;
  }
}

@media (max-width: 640px) {
  .flip-text-overlay {
    padding: 0 1rem;
    padding-bottom: 7rem;
  }
  
  .flip-text-block {
    left: 1rem;
    right: 1rem;
    padding: 1rem 1.25rem;
  }
  
  .flip-text-content {
    font-size: 0.95rem;
  }

  .flip-info-panel {
    gap: 1rem;
    padding: 0.75rem 1.25rem;
  }

  .flip-info-item span {
    display: none;
  }
}

/* ========================================
   Vault Section Styles
   ======================================== */
.vault-section {
  position: relative;
  background: #faf8f5;
  padding: var(--space-3xl) 0;
}

.vault-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.vault-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.vault-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: var(--font-weight-light);
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #2d2d2d;
  margin-bottom: var(--space-lg);
}

.vault-intro {
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  font-weight: var(--font-weight-regular);
  line-height: 1.8;
  color: #555555;
  max-width: 800px;
  margin: 0 auto;
}

.vault-viewer {
  margin-top: var(--space-2xl);
}

.vault-viewer-hint {
  text-align: center;
  font-size: 0.9rem;
  color: #777777;
  margin-bottom: var(--space-lg);
}

.vault-image-container {
  position: relative;
  width: 100%;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
}

.vault-base-image {
  width: 100%;
  display: block;
  filter: brightness(0.5);
  transition: filter 0.5s ease;
}

.vault-image-container.no-selection .vault-base-image {
  filter: brightness(1);
}

/* Vault spotlight overlays */
.vault-spotlight {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 3;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.vault-spotlight.active {
  opacity: 1;
}

.vault-spotlight-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(1.2) contrast(1.05);
}

/* Ellipse clip paths for each stage */
.vault-spotlight-1 .vault-spotlight-image {
  clip-path: ellipse(10% 25% at 83% 65%);
}

.vault-spotlight-2 .vault-spotlight-image {
  clip-path: ellipse(7% 23% at 65% 42%);
}

.vault-spotlight-3 .vault-spotlight-image {
  clip-path: ellipse(7% 25% at 49% 30%);
}

.vault-spotlight-4 .vault-spotlight-image {
  clip-path: ellipse(10% 23% at 31.8% 42%);
}

.vault-spotlight-5 .vault-spotlight-image {
  clip-path: ellipse(15% 20% at 23% 80%);
}

/* Vault clickable hotspots */
.vault-hotspot {
  position: absolute;
  cursor: pointer;
  transition: all 0.4s ease;
  z-index: 4;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.03);
  border: 2px solid rgba(0, 0, 0, 0.15);
}

.vault-hotspot:hover {
  background: rgba(0, 0, 0, 0.06);
  border-color: rgba(0, 0, 0, 0.3);
}

.vault-hotspot.active {
  border-color: #0066ff;
  background: rgba(0, 102, 255, 0.1);
  box-shadow: 0 0 30px rgba(0, 102, 255, 0.2);
}

/* Hotspot positions */
.vault-hotspot-1 {
  width: 20%;
  height: 50%;
  right: 7%;
  top: 40%;
}

.vault-hotspot-2 {
  width: 14%;
  height: 46%;
  right: 28%;
  top: 19%;
}

.vault-hotspot-3 {
  width: 14%;
  height: 50%;
  left: 42%;
  top: 5%;
}

.vault-hotspot-4 {
  width: 20%;
  height: 46%;
  left: 21.8%;
  top: 19%;
}

.vault-hotspot-5 {
  width: 30%;
  height: 40%;
  left: 8%;
  top: 60%;
}

/* Stage number indicator */
.vault-stage-number {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 28px;
  height: 28px;
  background: rgba(255, 255, 255, 0.9);
  border: 2px solid rgba(0, 0, 0, 0.2);
  border-radius: 50%;
  color: #2d2d2d;
  font-size: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.9;
  transition: all 0.3s ease;
}

.vault-hotspot:hover .vault-stage-number,
.vault-hotspot.active .vault-stage-number {
  opacity: 1;
  background: #0066ff;
  border-color: #0066ff;
  color: white;
  transform: translate(-50%, -50%) scale(1.1);
}

/* Stage buttons */
.vault-stage-buttons {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

.vault-stage-btn {
  padding: 0.75rem 1.25rem;
  background: rgba(0, 0, 0, 0.05);
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 100px;
  color: #555555;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.vault-stage-btn:hover {
  background: rgba(0, 0, 0, 0.08);
  border-color: rgba(0, 0, 0, 0.2);
  color: #2d2d2d;
}

.vault-stage-btn.active {
  background: #0066ff;
  border-color: #0066ff;
  color: white;
}

.vault-reset-btn {
  background: transparent;
  border-color: rgba(0, 0, 0, 0.2);
}

.vault-reset-btn:hover {
  border-color: rgba(0, 0, 0, 0.35);
}

/* Vault popup boxes */
.vault-popup {
  position: absolute;
  width: 300px;
  max-height: 260px;
  overflow-y: auto;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  padding: 1rem 1.25rem;
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.4s ease, visibility 0.4s ease, transform 0.4s ease;
  pointer-events: none;
}

.vault-popup.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.vault-popup-close {
  position: absolute;
  top: 8px;
  right: 10px;
  width: 24px;
  height: 24px;
  border: none;
  background: rgba(0, 0, 0, 0.05);
  border-radius: 50%;
  color: #666;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.vault-popup-close:hover {
  background: rgba(0, 0, 0, 0.1);
  color: #333;
}

.vault-popup-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: #0066ff;
  margin-bottom: 0.5rem;
  padding-right: 20px;
}

.vault-popup-text {
  font-size: 0.75rem;
  line-height: 1.6;
  color: #444444;
}

.vault-popup-text strong {
  font-weight: 600;
  color: #0066ff;
}

/* Custom scrollbar for popup */
.vault-popup::-webkit-scrollbar {
  width: 4px;
}

.vault-popup::-webkit-scrollbar-track {
  background: transparent;
}

.vault-popup::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 2px;
}

/* Popup positions - beside each highlighted area */
/* Stage 1 (Run-up) - right side of image, popup to its left */
.vault-popup-1 {
  right: 28%;
  top: 35%;
}

/* Stage 2 (Takeoff) - popup to its left */
.vault-popup-2 {
  right: 44%;
  top: 10%;
}

/* Stage 3 (Contact phase) - popup to its right */
.vault-popup-3 {
  left: 58%;
  top: 5%;
}

/* Stage 4 (Post-flight) - popup to its left */
.vault-popup-4 {
  left: 3%;
  top: 5%;
}

/* Stage 5 (Landing) - popup to its right */
.vault-popup-5 {
  left: 40%;
  bottom: 8%;
  top: auto;
}

/* Vault section responsive */
@media (max-width: 1024px) {
  .vault-popup {
    width: 240px;
    max-height: 200px;
    padding: 0.875rem 1rem;
  }
  
  .vault-popup-title {
    font-size: 0.8rem;
  }
  
  .vault-popup-text {
    font-size: 0.7rem;
  }
}

@media (max-width: 768px) {
  .vault-inner {
    padding: 0 var(--space-md);
  }
  
  .vault-stage-buttons {
    gap: 0.5rem;
  }
  
  .vault-stage-btn {
    padding: 0.6rem 1rem;
    font-size: 0.7rem;
  }
  
  /* On mobile, show popup as fixed at bottom */
  .vault-popup {
    position: fixed;
    left: 50% !important;
    right: auto !important;
    bottom: 20px !important;
    top: auto !important;
    width: calc(100% - 2rem);
    max-width: 400px;
    max-height: 180px;
    transform: translateX(-50%) translateY(20px);
    z-index: 100;
  }
  
  .vault-popup.active {
    transform: translateX(-50%) translateY(0);
  }
}

/* ========================================
   Bars Section Styles
   ======================================== */
.bars-section {
  position: relative;
  background: linear-gradient(180deg, #f5f3f0 0%, #faf8f5 50%, #f5f3f0 100%);
  padding: var(--space-3xl) 0;
}

.bars-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.bars-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.bars-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: var(--font-weight-light);
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #2d2d2d;
  margin-bottom: var(--space-lg);
}

.bars-intro {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  font-weight: var(--font-weight-regular);
  line-height: 1.8;
  color: #555555;
  max-width: 800px;
  margin: 0 auto;
}

/* Bars concepts grid */
.bars-concepts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

/* Individual concept cards */
.bars-card {
  background: rgba(255, 255, 255, 0.9);
  border-radius: 16px;
  padding: var(--space-xl);
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.bars-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #0066ff, #0099ff);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.bars-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.bars-card:hover::before {
  opacity: 1;
}

/* Wide card spans full width */
.bars-card-wide {
  grid-column: span 2;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-xl);
  align-items: start;
}

/* Highlight card with special styling */
.bars-card-highlight {
  grid-column: span 2;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-xl);
  align-items: start;
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.03) 0%, rgba(0, 102, 255, 0.08) 100%);
  border-color: rgba(0, 102, 255, 0.15);
}

.bars-card-highlight::before {
  opacity: 1;
}

.bars-card-badge {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: #0066ff;
  color: white;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 0.35rem 0.75rem;
  border-radius: 100px;
}

/* Card icon */
.bars-card-icon {
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, #f0f4ff 0%, #e8f0ff 100%);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #0066ff;
}

.bars-card-icon svg {
  width: 40px;
  height: 40px;
}

/* Non-wide cards stack icon above content */
.bars-card:not(.bars-card-wide):not(.bars-card-highlight) {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.bars-card:not(.bars-card-wide):not(.bars-card-highlight) .bars-card-icon {
  width: 64px;
  height: 64px;
}

.bars-card:not(.bars-card-wide):not(.bars-card-highlight) .bars-card-icon svg {
  width: 36px;
  height: 36px;
}

/* Card content */
.bars-card-content {
  flex: 1;
}

.bars-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #2d2d2d;
  margin-bottom: var(--space-sm);
}

.bars-card-text {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #555555;
}

.bars-card-text strong {
  font-weight: 600;
  color: #0066ff;
}

/* Bars section responsive */
@media (max-width: 900px) {
  .bars-concepts {
    grid-template-columns: 1fr;
  }
  
  .bars-card-wide,
  .bars-card-highlight {
    grid-column: span 1;
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .bars-card-wide .bars-card-icon,
  .bars-card-highlight .bars-card-icon {
    width: 64px;
    height: 64px;
  }
  
  .bars-card-wide .bars-card-icon svg,
  .bars-card-highlight .bars-card-icon svg {
    width: 36px;
    height: 36px;
  }
}

@media (max-width: 640px) {
  .bars-inner {
    padding: 0 var(--space-md);
  }
  
  .bars-card {
    padding: var(--space-lg);
  }
  
  .bars-card-title {
    font-size: 1rem;
  }
  
  .bars-card-text {
    font-size: 0.85rem;
  }
  
  .bars-card-badge {
    font-size: 0.65rem;
    padding: 0.25rem 0.6rem;
  }
}

/* ========================================
   NEW: Embedded 3D viewer styling
   ======================================== */
.viewer-shell {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: radial-gradient(1200px 600px at 30% 10%, rgba(220,38,38,0.10), transparent 55%),
              radial-gradient(900px 520px at 85% 40%, rgba(11,11,15,0.06), transparent 55%),
              var(--color-surface-2);
  border: 1px solid var(--color-border-soft);
}

.viewer-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border-soft);
}

.viewer-kicker {
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-weight: 600;
  color: rgba(11,11,15,0.70);
}

.viewer-hint {
  font-size: 12px;
  color: rgba(11,11,15,0.55);
}

.viewer-stage {
  position: relative;
  height: min(62vh, 520px);
  background: linear-gradient(180deg, rgba(255,255,255,0.65), rgba(255,255,255,0.35));
}

.viewer-canvas {
  position: absolute;
  inset: 0;
}

.viewer-canvas canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

.viewer-loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 5;
}

.viewer-loading[aria-hidden="true"] { display: none; }

.viewer-spinner {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid rgba(11,11,15,0.12);
  border-top-color: rgba(220,38,38,0.9);
  animation: spin 0.8s linear infinite;
}

.viewer-loading-text {
  font-size: 12px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(11,11,15,0.65);
}

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

.viewer-bottom {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-top: 1px solid var(--color-border-soft);
}

.viewer-team-label {
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-weight: 600;
  color: rgba(11,11,15,0.70);
}

.viewer-teams {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
  margin-left: auto;
}

.team-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(11,11,15,0.12);
  background: rgba(255,255,255,0.65);
  transition: transform var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.team-pill:hover {
  transform: translateY(-1px);
  border-color: rgba(11,11,15,0.20);
  background: rgba(255,255,255,0.85);
}

.team-pill.active {
  border-color: rgba(220,38,38,0.35);
  box-shadow: 0 10px 30px rgba(220,38,38,0.10);
}

.team-pill .swatch {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  border: 1px solid rgba(11,11,15,0.10);
}

.team-pill .abbr {
  font-size: 11px;
  letter-spacing: 1px;
  font-weight: 600;
  color: rgba(11,11,15,0.70);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 900px) {
  .info-points { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --navbar-height: 60px; }
  .navbar { padding: 0 var(--space-md); }

  .back-btn { left: var(--space-md); padding: var(--space-xs) var(--space-sm); }
  .back-btn span { display: none; }

  .nav-links { gap: var(--space-md); }
  .nav-links a { font-size: 13px; }

  .split-container { flex-direction: column; }
  .split-panel { flex: 1 1 50% !important; width: 100%; height: auto; }

  .step-content { flex-direction: column !important; text-align: center !important; gap: var(--space-lg); padding: 0 var(--space-md); }
  .step-orb { width: 160px; height: 160px; }
  .step-text { max-width: 100%; padding: var(--space-md) var(--space-lg); }

  .timeline-section { padding: var(--space-2xl) 0; }
  .timeline-card { flex: 0 0 280px; height: 360px; }
  .card-content { padding: var(--space-md); }

  .modal { padding: var(--space-lg); max-height: 90vh; }
  .info-inner { padding: 0 var(--space-md); }

  .viewer-stage { height: min(58vh, 440px); }

  .reference-inner { padding: 0 var(--space-md); }
  .reference-grid { grid-template-columns: 1fr; }
  .reference-category { padding: var(--space-md); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.viewer-embed{
  position: relative;
  width: 100%;
  height: min(78vh, 720px);
  border-radius: 18px;
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(0,0,0,0.08);
  box-shadow: 0 18px 60px rgba(0,0,0,0.08);
}

.viewer-embed iframe{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.viewer-embed__placeholder{
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
}

.viewer-embed__spinner{
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 2px solid rgba(0,0,0,0.12);
  border-top-color: rgba(220,38,38,0.9);
  animation: viewerSpin 0.8s linear infinite;
}

.viewer-embed__text{
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(0,0,0,0.55);
}

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