:root {
  --bg: #f7fbff;
  --paper: #ffffff;
  --ink: #102033;
  --muted: #5f7188;
  --line: rgba(30, 58, 138, 0.12);
  --blue-900: #15316f;
  --blue-600: #2563eb;
  --blue-400: #60a5fa;
  --cyan: #22d3ee;
  --aqua: #dff7ff;
  --shadow: 0 26px 70px rgba(37, 99, 235, 0.14);
  --radius: 24px;
  --max: 1120px;
  --font: "Inter", system-ui, sans-serif;
  --mono: "Space Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 4%, rgba(34, 211, 238, 0.26), transparent 28rem),
    radial-gradient(circle at 90% 18%, rgba(37, 99, 235, 0.16), transparent 28rem),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 40%, #ffffff 100%);
  line-height: 1.7;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(30, 58, 138, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 58, 138, 0.055) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(#000, transparent 85%);
  z-index: -1;
}

img { display: block; width: 100%; }
a { color: inherit; }
.case-hero, .section, .case-footer { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }

.case-nav {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 13px;
}

.back-link, .btn-primary, .btn-secondary, .prototype-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 800;
  transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
}

.back-link {
  color: var(--blue-900);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
}

.back-link::before { content: "←"; margin-right: 0.55rem; }
.back-link:hover, .btn-primary:hover, .btn-secondary:hover, .prototype-link:hover { transform: translateY(-2px); }

.nav-meta, .eyebrow, .day-badge {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11px;
  font-weight: 700;
}

.nav-meta { color: var(--muted); }
.eyebrow { color: var(--blue-600); margin: 0 0 1rem; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) 360px;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  padding: clamp(2rem, 5vw, 4.5rem) 0 clamp(2rem, 4vw, 3rem);
}

.hero-copy h1, h2 {
  margin: 0;
  color: var(--blue-900);
  letter-spacing: -0.055em;
  line-height: 0.96;
}

.hero-copy h1 { font-size: clamp(3rem, 6.3vw, 6.4rem); max-width: 820px; line-height: 1; }
h2 { font-size: clamp(2.2rem, 5vw, 4.8rem); }
h3 { margin: 0; color: var(--blue-900); line-height: 1.15; font-size: clamp(1.2rem, 2vw, 1.6rem); }

.hero-lead {
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.45rem);
  margin: 1.5rem 0 0;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }
.btn-primary { background: var(--blue-900); color: #fff; box-shadow: 0 18px 44px rgba(21, 49, 111, 0.22); }
.btn-secondary { background: #fff; color: var(--blue-900); border: 1px solid var(--line); }

.hero-panel {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.15rem;
  backdrop-filter: blur(18px);
}

.hero-panel div {
  padding: 1rem;
  border-bottom: 1px solid var(--line);
}

.hero-panel div:last-child { border-bottom: 0; }
.hero-panel span { display: block; color: var(--muted); font-size: 12px; margin-bottom: 0.25rem; }
.hero-panel strong { color: var(--blue-900); line-height: 1.35; }

.hero-image {
  margin: 0 0 clamp(3rem, 6vw, 6rem);
  border-radius: clamp(22px, 3vw, 42px);
  overflow: visible;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
  background: #fff;
}

.section { padding: clamp(4rem, 8vw, 7rem) 0; border-top: 1px solid var(--line); }
.section-head { max-width: 820px; margin-bottom: clamp(2rem, 4vw, 3.2rem); }
.section-head.wide { max-width: 980px; }
.section-head.mini { margin-top: clamp(2.5rem, 5vw, 4rem); margin-bottom: 1.5rem; }
.section-head p, .copy p, .day-copy p, .final-section > .section-head p { color: var(--muted); font-size: clamp(1rem, 1.4vw, 1.12rem); }

.split, .day-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
}

.day-layout.reverse { grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1fr); }
.day-layout.reverse .day-copy { order: 2; }

.impact-card, .data-box, .persona-grid article {
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.impact-card {
  min-height: 330px;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  position: relative;
  overflow: hidden;
}

.water-mark {
  position: absolute;
  right: -0.2em;
  bottom: -0.45em;
  font-size: 18rem;
  line-height: 1;
  font-weight: 900;
  color: rgba(37, 99, 235, 0.06);
}

figure { margin: 0; }
figure img {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: 0 20px 54px rgba(16, 32, 51, 0.08);
  background: #fff;
  object-fit: contain;
}

.image-grid {
  display: grid;
  gap: clamp(1rem, 2vw, 1.5rem);
}

.image-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.image-grid.compact { margin-top: 1.5rem; }

.tinted {
  width: 100%;
  max-width: none;
  padding-left: max(20px, calc((100vw - var(--max)) / 2));
  padding-right: max(20px, calc((100vw - var(--max)) / 2));
  background: linear-gradient(135deg, rgba(219, 234, 254, 0.56), rgba(236, 254, 255, 0.68));
}

.day-badge {
  display: inline-flex;
  width: fit-content;
  background: var(--blue-900);
  color: #fff;
  border-radius: 999px;
  padding: 0.48rem 0.85rem;
  margin-bottom: 1rem;
}

.persona-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.4rem);
}

.persona-grid article { overflow: visible; }
.persona-grid article img { aspect-ratio: auto; object-fit: contain; border-radius: var(--radius) var(--radius) 0 0; box-shadow: none; border: 0; background: #fff; }
.persona-grid article h3, .persona-grid article p { padding-inline: 1.1rem; }
.persona-grid article h3 { margin-top: 1rem; }
.persona-grid article p { color: var(--muted); font-size: 0.95rem; margin-bottom: 1.2rem; }

.data-box {
  display: grid;
  gap: 0.7rem;
  padding: 1rem;
  margin-top: 1.5rem;
}

.data-box p {
  margin: 0;
  display: grid;
  grid-template-columns: 116px 1fr;
  gap: 1rem;
  align-items: baseline;
  color: var(--muted);
}

.data-box strong { color: var(--blue-600); font-size: 1.5rem; }

.inline-figure { margin-top: 1.5rem; }

.check-list {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.check-list li {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.85rem 1rem;
  color: var(--muted);
}

.check-list li::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--cyan);
  margin-right: 0.7rem;
}

.final-section { text-align: center; }
.final-section .section-head { margin-inline: auto; }
.prototype-card {
  position: relative;
  border-radius: clamp(22px, 3vw, 40px);
  overflow: visible;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
  background: #fff;
}

.prototype-card img { border: 0; border-radius: clamp(22px, 3vw, 40px); filter: saturate(1.08) brightness(0.9); object-fit: contain; }
.prototype-link {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  background: var(--blue-900);
  min-height: 58px;
  padding-inline: 28px;
  box-shadow: 0 20px 60px rgba(16, 32, 51, 0.34);
}
.prototype-link:hover { transform: translate(-50%, calc(-50% - 3px)); background: var(--blue-600); }

.case-footer {
  padding: clamp(4rem, 8vw, 7rem) 0;
  text-align: center;
}

.case-footer p {
  margin: 0 auto 2rem;
  max-width: 760px;
  color: var(--blue-900);
  font-size: clamp(2rem, 4vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
}

.reveal {
  opacity: 0;
  transform: translateY(26px);
  filter: blur(10px);
  transition:
    opacity 0.72s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.72s cubic-bezier(0.22, 1, 0.36, 1),
    filter 0.72s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.in-view {
  opacity: 1;
  transform: none;
  filter: none;
}

.reveal[data-reveal="image"] { transform: translateY(34px) scale(0.985); }
.reveal[data-reveal="image"].in-view { transform: none; }

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

@media (max-width: 900px) {
  .hero-grid, .split, .day-layout, .day-layout.reverse { grid-template-columns: 1fr; }
  .day-layout.reverse .day-copy { order: initial; }
  .hero-panel { max-width: none; }
  .image-grid.two, .persona-grid { grid-template-columns: 1fr; }
  .case-nav { align-items: flex-start; flex-direction: column; justify-content: center; padding: 1rem 0; }
}

@media (max-width: 560px) {
  .case-hero, .section, .case-footer { width: min(var(--max), calc(100% - 28px)); }
  .hero-copy h1 { font-size: clamp(3rem, 16vw, 4.2rem); }
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-secondary, .prototype-link { width: 100%; }
  .prototype-link { width: calc(100% - 32px); padding-inline: 18px; text-align: center; }
  .data-box p { grid-template-columns: 1fr; gap: 0.1rem; }
}

html,
body {
  height: auto !important;
  min-height: 100% !important;
  overflow-x: hidden;
  overflow-y: auto !important;
  overscroll-behavior-y: auto;
  touch-action: pan-y;
  scrollbar-gutter: stable;
}