/* Sentinel Prime — Story / Foundations page */

.story-page {
  --story-accent: #00a8cc;
  --story-accent-dim: rgba(0, 168, 204, 0.35);
  --story-text: #d8dde3;
  --story-muted: #8a939e;
  --story-line: rgba(255, 255, 255, 0.08);
  --story-max: 680px;
  --story-nav-w: 220px;
}

.story-page .shell-main {
  padding-top: 4.5rem;
}

.story-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 300;
  background: rgba(255, 255, 255, 0.04);
}

.story-progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--story-accent), #66cce8);
  transition: width 0.08s linear;
}

.story-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem) 5rem;
}

.story-nav {
  display: none;
}

.story-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.story-nav__list a {
  display: block;
  padding: 0.45rem 0;
  color: var(--story-muted);
  text-decoration: none;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  border-left: 2px solid transparent;
  padding-left: 0.85rem;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.story-nav__list a.is-active {
  color: #fff;
  border-left-color: var(--story-accent);
}

.story-nav__list a:hover {
  color: #fff;
}

.story-content {
  min-width: 0;
}

.story-hero {
  position: relative;
  min-height: 72vh;
  display: flex;
  align-items: center;
  padding: 4rem 0 3rem;
  overflow: hidden;
}

.story-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 168, 204, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 168, 204, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black, transparent);
  opacity: 0.6;
  pointer-events: none;
}

.story-hero__glow {
  position: absolute;
  width: 60%;
  height: 50%;
  top: 10%;
  left: 20%;
  background: radial-gradient(circle, rgba(0, 168, 204, 0.08), transparent 70%);
  pointer-events: none;
}

.story-hero__inner {
  position: relative;
  max-width: var(--story-max);
}

.story-kicker {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--story-accent);
  margin: 0 0 1rem;
}

.story-hero h1 {
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  font-weight: 800;
  line-height: 1.08;
  margin: 0 0 1.25rem;
  letter-spacing: -0.02em;
}

.story-hero__lead {
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  color: var(--story-text);
  line-height: 1.65;
  margin: 0 0 2rem;
  max-width: 36em;
}

.story-section {
  padding: 4rem 0;
  border-top: 1px solid var(--story-line);
  scroll-margin-top: 5rem;
}

.story-section--alt {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.015), transparent 40%);
}

.story-section__inner {
  max-width: var(--story-max);
}

.story-section h2 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 800;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

.story-section h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 2rem 0 0.5rem;
  color: #fff;
}

.story-section p,
.story-section li {
  color: var(--story-text);
  line-height: 1.75;
  font-size: 1.02rem;
}

.story-section ul {
  padding-left: 1.2rem;
  margin: 1rem 0;
}

.story-section li {
  margin-bottom: 0.45rem;
}

.story-quote {
  margin: 2.5rem 0;
  padding: 1.75rem 1.5rem;
  border-left: 3px solid var(--story-accent);
  background: rgba(0, 168, 204, 0.04);
  border-radius: 0 8px 8px 0;
}

.story-quote blockquote {
  margin: 0;
  font-size: clamp(1.2rem, 3vw, 1.55rem);
  font-weight: 600;
  line-height: 1.45;
  color: #fff;
}

.story-quote cite {
  display: block;
  margin-top: 0.85rem;
  font-size: 0.82rem;
  font-style: normal;
  color: var(--story-muted);
  letter-spacing: 0.06em;
}

.story-brick {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}

.story-brick__meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.story-brick__icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  border: 1px solid var(--story-accent-dim);
  display: grid;
  place-items: center;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--story-accent);
  background: rgba(0, 0, 0, 0.4);
}

.story-brick__label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--story-muted);
}

.story-brick__title {
  font-size: 1.35rem;
  font-weight: 800;
  margin: 0;
}

.story-brick__lesson {
  font-size: 0.88rem;
  color: var(--story-accent);
  font-weight: 600;
  letter-spacing: 0.04em;
  margin: 0.35rem 0 0;
}

.story-diagram {
  margin: 2.5rem 0;
  padding: 1.5rem;
  border: 1px solid var(--story-line);
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.35);
  overflow-x: auto;
}

.story-diagram svg {
  display: block;
  width: 100%;
  min-width: 280px;
  height: auto;
}

.story-diagram__caption {
  margin: 0.85rem 0 0;
  font-size: 0.78rem;
  color: var(--story-muted);
  text-align: center;
}

.story-tower {
  position: relative;
  min-height: 320px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 2rem 0;
}

.story-tower__stack {
  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  gap: 0.35rem;
  width: 100%;
  max-width: 420px;
}

.story-tower__layer {
  width: var(--w, 100%);
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--story-line);
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
  color: var(--story-muted);
  background: rgba(255, 255, 255, 0.02);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease, transform 0.6s ease, border-color 0.3s ease, color 0.3s ease;
}

.story-tower.is-visible .story-tower__layer {
  opacity: 1;
  transform: translateY(0);
}

.story-tower.is-visible .story-tower__layer:nth-child(1) { transition-delay: 0.05s; }
.story-tower.is-visible .story-tower__layer:nth-child(2) { transition-delay: 0.12s; }
.story-tower.is-visible .story-tower__layer:nth-child(3) { transition-delay: 0.19s; }
.story-tower.is-visible .story-tower__layer:nth-child(4) { transition-delay: 0.26s; }
.story-tower.is-visible .story-tower__layer:nth-child(5) { transition-delay: 0.33s; }
.story-tower.is-visible .story-tower__layer:nth-child(6) { transition-delay: 0.4s; }

.story-tower__layer--cap {
  --w: 52%;
  border-color: var(--story-accent-dim);
  color: #fff;
  background: rgba(0, 168, 204, 0.08);
}

.story-timeline {
  position: relative;
  margin: 2rem 0;
  padding-left: 1.5rem;
}

.story-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 2px;
  background: linear-gradient(180deg, var(--story-accent), rgba(0, 168, 204, 0.1));
}

.story-timeline__item {
  position: relative;
  padding: 0 0 1.75rem 1.25rem;
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.story-timeline__item.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.story-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.56rem;
  top: 0.45rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--story-accent);
  box-shadow: 0 0 12px rgba(0, 168, 204, 0.5);
}

.story-timeline__year {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--story-accent);
  margin-bottom: 0.25rem;
}

.story-timeline__title {
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.35rem;
}

.story-timeline__text {
  font-size: 0.92rem;
  color: var(--story-muted);
  line-height: 1.6;
}

.story-cta {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.story-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.story-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 960px) {
  .story-layout {
    grid-template-columns: var(--story-nav-w) 1fr;
    gap: 3rem;
  }

  .story-nav {
    display: block;
    position: sticky;
    top: 6rem;
    align-self: start;
    max-height: calc(100vh - 7rem);
    overflow-y: auto;
  }

  .story-nav__title {
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--story-muted);
    margin: 0 0 1rem;
    padding-left: 0.85rem;
  }

  .story-brick {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

@media (max-width: 767px) {
  .story-page .shell-main {
    padding-top: calc(4rem + env(safe-area-inset-top, 0));
  }

  .story-hero {
    min-height: auto;
    padding: 2rem 0 2.25rem;
  }

  .story-hero h1 {
    font-size: clamp(1.85rem, 9vw, 2.6rem);
  }

  .story-hero__lead {
    font-size: 1rem;
    line-height: 1.6;
    max-width: none;
  }

  .story-section {
    padding: 2.25rem 0;
    scroll-margin-top: calc(4.5rem + env(safe-area-inset-top, 0));
  }

  .story-section p,
  .story-section li {
    font-size: 0.94rem;
    line-height: 1.65;
  }

  .story-quote blockquote {
    font-size: 1.05rem;
  }

  .story-diagram {
    padding: 1rem;
    margin: 1.75rem 0;
  }

  .story-tower {
    min-height: 260px;
    padding: 1.25rem 0;
  }

  .story-tower__layer {
    font-size: 0.62rem;
    padding: 0.45rem 0.55rem;
  }

  .story-timeline {
    padding-left: 1.1rem;
  }

  .story-timeline__text {
    font-size: 0.86rem;
  }

  .story-cta {
    flex-direction: column;
  }

  .story-cta .il-btn {
    width: 100%;
    justify-content: center;
  }

  .story-layout {
    padding-bottom: calc(3.5rem + env(safe-area-inset-bottom, 0));
  }
}

@media (prefers-reduced-motion: reduce) {
  .story-reveal,
  .story-timeline__item,
  .story-tower__layer {
    opacity: 1;
    transform: none;
    transition: none;
  }
}