:root {
  --ups-brown: #351c15;
  --ups-brown-mid: #5c3317;
  --ups-brown-dark: #2a150f;
  --ups-gold: #ffb500;
  --ups-gold-bright: #ffc400;
  --ups-cream: #fdfbf7;
  --ups-marketing-bg-bottom: #1a0f0c;
  --ups-text-on-gold: #351c15;
  --ups-text-on-gold-strong: #1a0d08;
  --artic-navy: var(--ups-brown-mid);
  --artic-navy-dark: var(--ups-brown);
  --artic-blue: var(--ups-gold);
  --artic-cream: var(--ups-cream);
  --artic-silver: rgba(253, 251, 247, 0.72);
  --dh-army-red: #e31937;
  --dh-army-green: #519541;
  --dh-army-olive: #5c3317;
  --dh-army-olive-dark: #351c15;
  --dh-army-khaki: #e8e0ce;
  --dh-army-gold: var(--ups-gold);
  --dh-army-dark: var(--ups-marketing-bg-bottom);
  --dh-font: "Open Sans", system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--dh-font);
  color: var(--ups-cream);
  background: var(--ups-marketing-bg-bottom);
  min-height: 100dvh;
  line-height: 1.5;
}

.demo-landing {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1.5rem, 5vw, 3rem);
  background:
    radial-gradient(ellipse 90% 55% at 50% -8%, rgba(255, 181, 0, 0.14), transparent 58%),
    linear-gradient(160deg, rgba(92, 51, 23, 0.55) 0%, transparent 42%),
    linear-gradient(180deg, var(--ups-brown) 0%, var(--ups-marketing-bg-bottom) 52%);
  border-top: 4px solid var(--ups-gold);
}

.demo-landing-header {
  max-width: 42rem;
  text-align: center;
}

.demo-landing-logo {
  display: block;
  max-width: min(220px, 75vw);
  height: auto;
  margin: 0 auto 1rem;
  border-radius: 0;
  filter: drop-shadow(0 4px 14px rgba(0, 0, 0, 0.42));
}

.demo-landing-tagline {
  margin: -0.35rem 0 0.75rem;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--artic-silver, #b8c4cc);
}

.demo-landing-badge {
  display: inline-block;
  background: var(--ups-gold);
  color: var(--ups-text-on-gold);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  margin-bottom: 1rem;
}

.demo-landing h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 5vw, 2.35rem);
  font-weight: 700;
  line-height: 1.2;
}

.demo-landing-lead {
  margin: 0 0 1.25rem;
  color: rgba(245, 245, 234, 0.88);
  font-size: 1.05rem;
}

.demo-landing-features {
  list-style: none;
  padding: 0;
  margin: 0 0 1.75rem;
  text-align: left;
  display: inline-block;
}

.demo-landing-features li {
  padding: 0.35rem 0 0.35rem 1.5rem;
  position: relative;
  color: rgba(245, 245, 234, 0.9);
}

.demo-landing-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--dh-army-green);
  border-radius: 2px;
}

.demo-landing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 1rem;
}

.demo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.65rem 1.75rem;
  font: 700 1rem/1 var(--dh-font);
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s, background 0.15s;
}

.demo-btn:active {
  transform: scale(0.98);
}

.demo-btn-primary {
  background: var(--ups-gold);
  color: var(--ups-text-on-gold);
  border-color: var(--ups-gold);
  min-width: 12rem;
}

.demo-btn-primary:hover {
  filter: brightness(1.06);
}

.demo-btn-ghost {
  background: transparent;
  color: var(--ups-cream);
  border-color: rgba(255, 181, 0, 0.45);
}

.demo-btn-ghost:hover {
  background: rgba(255, 181, 0, 0.12);
}

.demo-landing-note {
  margin: 0;
  font-size: 0.82rem;
  color: rgba(245, 245, 234, 0.55);
}

.demo-showcase {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

.demo-chrome {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding: 0.5rem 0.85rem;
  background: var(--ups-brown);
  border-bottom: 3px solid var(--ups-gold);
  flex-shrink: 0;
}

.demo-chrome-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.demo-chrome-logo {
  display: block;
  width: auto;
  max-height: 2rem;
  height: auto;
  border-radius: 3px;
}

.demo-chrome-badge {
  background: var(--ups-gold);
  color: var(--ups-text-on-gold);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 0.12rem 0.4rem;
  border-radius: 3px;
}

.demo-chrome-title {
  font-weight: 600;
  font-size: 0.9rem;
}

.demo-chrome-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
}

.demo-ctrl-btn {
  background: var(--dh-army-olive);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  padding: 0.35rem 0.7rem;
  font: 600 0.82rem/1 var(--dh-font);
  cursor: pointer;
}

.demo-ctrl-btn:hover {
  background: #5a6530;
}

.demo-ctrl-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.demo-speed-label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 600;
}

.demo-speed-label select {
  font: inherit;
  padding: 0.25rem 0.4rem;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: var(--dh-army-dark);
  color: #fff;
}

.demo-ctrl-link {
  color: var(--dh-army-gold);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.35rem 0.5rem;
}

.demo-ctrl-link:hover {
  text-decoration: underline;
}

.demo-stage {
  position: relative;
  flex: 1;
  display: grid;
  grid-template-columns: 1fr;
  min-height: 0;
  background: var(--dh-army-khaki);
}

@media (min-width: 900px) {
  .demo-stage {
    grid-template-columns: 1fr min(220px, 28vw);
  }
}

.demo-app-frame {
  width: 100%;
  height: 100%;
  min-height: calc(100dvh - 3.25rem);
  border: 0;
  background: #f8f8f8;
}

.demo-chapter-rail {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.65rem 0.5rem;
  background: var(--dh-army-olive-dark);
  color: #f5f5ea;
  overflow-y: auto;
  font-size: 0.78rem;
}

@media (min-width: 900px) {
  .demo-chapter-rail {
    display: flex;
  }
}

.demo-chapter-item {
  padding: 0.4rem 0.5rem;
  border-radius: 4px;
  border-left: 3px solid transparent;
  opacity: 0.55;
  transition: opacity 0.2s, border-color 0.2s;
}

.demo-chapter-item.is-active {
  opacity: 1;
  border-left-color: var(--dh-army-gold);
  background: rgba(0, 0, 0, 0.15);
}

.demo-chapter-item.is-done {
  opacity: 0.75;
}

.demo-chapter-num {
  font-weight: 700;
  color: var(--dh-army-gold);
  margin-right: 0.25rem;
}

.demo-caption-overlay {
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.75rem;
  max-width: 36rem;
  margin: 0 auto;
  padding: 0.65rem 0.9rem;
  background: rgba(20, 28, 12, 0.94);
  color: #f5f5ea;
  border-radius: 10px;
  border-left: 4px solid var(--dh-army-gold);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  pointer-events: none;
  z-index: 10;
}

@media (min-width: 900px) {
  .demo-caption-overlay {
    left: 0.75rem;
    right: calc(min(220px, 28vw) + 0.75rem);
    margin: 0;
  }
}

.demo-caption-step {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--dh-army-gold);
  margin-bottom: 0.2rem;
}

.demo-caption-text {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.35;
}

.demo-showcase.is-complete .demo-caption-overlay {
  border-left-color: var(--dh-army-green);
}