:root {
  color-scheme: light;
  --bg: #f5f8fc;
  --bg-elevated: rgba(255, 255, 255, 0.96);
  --panel: rgba(44, 106, 179, 0.08);
  --panel-strong: rgba(44, 106, 179, 0.14);
  --border: rgba(33, 62, 97, 0.14);
  --text: #15314f;
  --muted: #5f7691;
  --accent: #3e84d8;
  --accent-strong: #7ec8ff;
  --shadow: 0 20px 50px rgba(30, 67, 114, 0.12);
  --radius: 24px;
  --sidebar-width: 290px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, rgba(126, 200, 255, 0.28), transparent 34%),
    linear-gradient(180deg, #ffffff, var(--bg));
  color: var(--text);
  scroll-snap-type: y proximity;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-width);
  padding: 28px 22px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(18px);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 24px;
  z-index: 20;
}

.sidebar__brand h1 {
  margin: 8px 0 10px;
  font-size: 32px;
  line-height: 1.1;
}

.sidebar__brand p,
.sidebar__footer p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.sidebar__nav {
  display: grid;
  gap: 8px;
}

.nav-link {
  padding: 12px 14px;
  border-radius: 14px;
  color: var(--muted);
  border: 1px solid transparent;
  transition: 180ms ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--text);
  border-color: var(--border);
  background: var(--panel);
}

.nav-link.active {
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: var(--shadow);
}

.sidebar__footer {
  margin-top: auto;
  display: grid;
  gap: 10px;
  font-size: 14px;
}

.deck {
  margin-left: var(--sidebar-width);
}

.slide {
  min-height: 100vh;
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  scroll-snap-align: start;
}

.slide__content,
.layout,
.two-column,
.summary-grid {
  width: min(1400px, 100%);
  margin: 0 auto;
}

.slide__content {
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(320px, 1fr) minmax(420px, 1.2fr);
  align-items: center;
}

.slide--hero .slide__text {
  max-width: 620px;
}

.slide__header {
  width: min(1400px, 100%);
  margin: 0 auto 24px;
}

.slide__header h2,
.slide__text h2 {
  margin: 6px 0 0;
  font-size: clamp(34px, 4vw, 60px);
  line-height: 1.1;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-strong);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
}

.lead {
  margin: 18px 0 0;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.8;
  color: var(--muted);
}

.chip-row {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.chip {
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.two-column--asymmetric {
  grid-template-columns: minmax(300px, 0.78fr) minmax(400px, 1.22fr);
}

.layout {
  display: grid;
  gap: 28px;
}

.layout--wide-media {
  grid-template-columns: minmax(320px, 0.9fr) minmax(420px, 1.1fr);
  align-items: center;
}

.layout--tall-media {
  grid-template-columns: minmax(300px, 0.78fr) minmax(380px, 0.92fr);
  align-items: center;
}

.flow-layout {
  width: min(1400px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(360px, 1fr) minmax(280px, 0.9fr);
  gap: 24px;
  align-items: start;
}

.layout__span-all {
  grid-column: 1 / -1;
}

.info-panel,
.step-card,
.summary-card,
.gallery-panel,
.media-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.info-panel,
.gallery-panel,
.summary-card,
.step-card {
  padding: 24px;
}

.info-panel h3,
.step-card h3,
.summary-card h3,
.gallery-header h3 {
  margin: 0 0 12px;
  font-size: 22px;
}

.gallery-header p,
.summary-card p,
.step-card p,
.info-panel p,
.bullet-list,
.number-list {
  color: var(--muted);
}

.bullet-list,
.number-list {
  margin: 0;
  padding-left: 22px;
  line-height: 1.8;
}

.bullet-list--spaced li,
.number-list li {
  margin-bottom: 12px;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.step-grid--two-up {
  width: min(1200px, 100%);
  margin: 0 auto;
}

.step-card {
  min-height: 180px;
}

.media-card {
  padding: 18px;
}

.media-card figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.media-card img {
  width: 100%;
  border-radius: 16px;
  object-fit: contain;
  background: rgba(232, 240, 250, 0.75);
}

.media-card--wide img {
  max-height: min(58vh, 720px);
}

.media-card--wide-xl img {
  max-height: min(56vh, 700px);
}

.media-card--tall {
  justify-self: center;
  width: min(100%, 560px);
}

.media-card--tall img {
  max-height: 72vh;
}

.media-card--flow {
  align-self: stretch;
}

.media-card--flow img {
  max-height: 52vh;
}

.media-card--svg img {
  min-height: 360px;
  max-height: 60vh;
}

.gallery-panel {
  padding-bottom: 16px;
}

.flow-text-panel,
.flow-tools-panel {
  height: 100%;
}

.flow-text-panel h3 {
  margin: 0 0 14px;
  font-size: 22px;
}

.gallery-header {
  padding: 0 24px 12px;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 0 24px 24px;
}

.screenshot-grid--single {
  grid-template-columns: minmax(280px, 420px);
  justify-content: center;
}

.flow-tools-grid {
  display: grid;
  gap: 14px;
  padding: 0 20px 20px;
}

.flow-tools-grid--single {
  grid-template-columns: 1fr;
}

.screenshot-card {
  margin: 0;
  padding: 14px;
  border-radius: 18px;
  background: var(--panel);
  border: 1px solid var(--border);
}

.screenshot-card img {
  width: 100%;
  aspect-ratio: 16 / 8;
  object-fit: contain;
  border-radius: 12px;
  background: rgba(232, 240, 250, 0.9);
}

.screenshot-card figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.deck-controls {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  backdrop-filter: blur(18px);
}

.deck-controls button,
.image-modal__close {
  border: 0;
  cursor: pointer;
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  border-radius: 999px;
  padding: 10px 18px;
  font-size: 14px;
}

.deck-controls button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.deck-controls span {
  color: var(--muted);
  min-width: 64px;
  text-align: center;
}

.zoomable {
  cursor: zoom-in;
}

.image-modal {
  width: min(92vw, 1440px);
  max-height: 92vh;
  padding: 24px;
  border-radius: 24px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.97);
  color: var(--text);
}

.image-modal::backdrop {
  background: rgba(110, 133, 161, 0.28);
  backdrop-filter: blur(6px);
}

.image-modal img {
  width: 100%;
  max-height: 76vh;
  object-fit: contain;
  border-radius: 16px;
}

.image-modal p {
  margin: 14px 0 0;
  color: var(--muted);
}

.image-modal__close {
  margin-bottom: 12px;
}

@media (max-width: 1200px) {
  .slide {
    padding: 40px 28px 88px;
  }

  .slide__content,
  .layout--wide-media,
  .layout--tall-media,
  .flow-layout,
  .two-column,
  .two-column--asymmetric {
    grid-template-columns: 1fr;
  }

  .media-card--tall {
    width: min(100%, 760px);
  }

  .media-card--flow img {
    max-height: 64vh;
  }
}

@media (max-width: 920px) {
  .sidebar {
    position: static;
    width: 100%;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .deck {
    margin-left: 0;
  }

  .slide {
    min-height: auto;
    padding-top: 32px;
  }

  .slide__content {
    grid-template-columns: 1fr;
  }

  .step-grid,
  .summary-grid,
  .screenshot-grid {
    grid-template-columns: 1fr;
  }

  .deck-controls {
    right: 16px;
    left: 16px;
    bottom: 16px;
    justify-content: space-between;
  }
}

@media (max-width: 640px) {
  .slide {
    padding: 28px 18px 96px;
  }

  .sidebar {
    padding: 20px 16px;
  }

  .media-card,
  .info-panel,
  .gallery-panel,
  .step-card,
  .summary-card {
    padding: 18px;
  }

  .gallery-header,
  .screenshot-grid {
    padding-left: 18px;
    padding-right: 18px;
  }

  .deck-controls {
    gap: 8px;
    padding: 10px 12px;
  }

  .deck-controls button {
    padding: 9px 14px;
  }

  .media-card--wide img,
  .media-card--wide-xl img,
  .media-card--tall img,
  .media-card--svg img {
    max-height: none;
  }
}