:root {
  --brand: #14b8a6;
  --brand-bright: #67e8f9;
  --brand-deep: #0f766e;
  --night: #030811;
  --ink: #0b1220;
  --body: #526071;
  --paper: #f7fafb;
  --line: #dce7ea;
  --yellow: #f5d547;
  --font: "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); font-size: 15px; }
body { min-width: 280px; margin: 0; overflow-x: hidden; background: var(--paper); color: var(--ink); font: 400 14.5px/1.5 var(--font); }
img { max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin-top: 0; }
.case-shell { width: min(1160px,calc(100% - 48px)); margin-inline: auto; }
.case-announcement { height: 36px; display: grid; place-items: center; border-bottom: 1px solid #c9a900; padding-inline: 1rem; background: var(--yellow); color: #0b1220; font-size: .78rem; font-weight: 900; line-height: 1; letter-spacing: .02em; text-align: center; }
.case-top { background: radial-gradient(circle at 78% 52%,rgba(20,184,166,.22),transparent 27%),linear-gradient(130deg,#02060c,#06131c); color: #fff; }
.case-nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.case-logo { min-height: 44px; display: inline-flex; align-items: center; gap: .65rem; font-weight: 900; letter-spacing: -.03em; }
.case-logo img { width: 31px; height: 31px; filter: invert(67%) sepia(28%) saturate(1160%) hue-rotate(126deg) brightness(91%) drop-shadow(0 5px 14px rgba(20,184,166,.4)); }
.back-link { min-height: 44px; display: inline-flex; align-items: center; gap: .55rem; border: 1px solid rgba(255,255,255,.45); border-radius: 999px; padding: .65rem 1rem; color: #e9f1f4; font-size: .66rem; font-weight: 800; text-transform: uppercase; }
.back-link:hover, .back-link:focus-visible { border-color: var(--brand-bright); outline: 0; }
.case-hero { display: grid; grid-template-columns: minmax(300px,.72fr) minmax(500px,1.28fr); align-items: center; gap: 2.5rem; padding: 3rem 0 4.5rem; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: .45rem; margin-bottom: .95rem; color: #8fa3ad; font-size: .62rem; }
.breadcrumb a { color: var(--brand-bright); }
.case-kicker { margin: 0 0 .65rem; color: var(--brand-bright); font-size: .66rem; font-weight: 900; letter-spacing: .045em; text-transform: uppercase; }
.case-hero h1 { margin: 0 0 .62rem; font-size: clamp(1.95rem,3.35vw,3.2rem); font-weight: 900; line-height: .94; letter-spacing: -.052em; text-transform: uppercase; }
.case-intro { max-width: 510px; margin: 0; color: #b8c6ce; font-size: .94rem; line-height: 1.55; }
.case-visual { position: relative; aspect-ratio: 16/9; margin: 0; overflow: hidden; border: 1px solid rgba(103,232,249,.18); border-radius: 18px; background: #1e1e1e; box-shadow: 0 25px 55px rgba(0,0,0,.4); }
.case-visual img { position: absolute; height: auto; display: block; }
.case-desktop { z-index: 1; bottom: 2%; left: 2%; width: 82%; }
.case-mobile { z-index: 2; right: 2%; bottom: 4%; width: 22%; filter: drop-shadow(0 14px 16px rgba(0,0,0,.45)); }
.case-main { padding: 4.5rem 0; }
.case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.case-section { border-top: 3px solid var(--brand); padding-top: 1.15rem; }
.case-section h2 { margin: 0 0 .55rem; font-size: clamp(1.3rem,2vw,1.75rem); font-weight: 900; line-height: 1; letter-spacing: -.035em; text-transform: uppercase; }
.case-section > p { margin: 0; color: var(--body); font-size: .85rem; line-height: 1.7; }
.case-section ul { display: grid; gap: .75rem; margin: 0; padding: 0; list-style: none; }
.case-section li { position: relative; border-bottom: 1px solid var(--line); padding: 0 0 .72rem 1.45rem; color: var(--body); font-size: .82rem; }
.case-section li::before { position: absolute; top: .25rem; left: 0; width: 8px; height: 8px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 10px rgba(20,184,166,.5); content: ""; }
.case-cta { padding: 3.4rem 0; background: linear-gradient(130deg,#031019,#09212a); color: #fff; }
.case-cta-grid { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.case-cta h2 { max-width: 720px; margin: 0 0 .38rem; font-size: clamp(1.35rem,2.45vw,2rem); font-weight: 900; line-height: 1; letter-spacing: -.04em; text-transform: uppercase; }
.case-cta p { margin: 0; color: #adc0c9; font-size: .78rem; }
.case-button { min-width: 190px; min-height: 52px; display: inline-flex; align-items: center; justify-content: center; border-radius: 999px; padding: .8rem 1.2rem; background: var(--brand); color: #031014; box-shadow: 0 10px 28px rgba(20,184,166,.28); font-size: .67rem; font-weight: 900; text-transform: uppercase; }
.case-footer { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; color: #71808a; font-size: .58rem; }
.case-footer a { min-height: 44px; display: inline-flex; align-items: center; color: var(--brand-deep); font-weight: 800; }

@media (max-width: 820px) {
  .case-shell { width: min(100% - 32px,1160px); }
  .case-hero { grid-template-columns: 1fr; gap: 2rem; padding: 2rem 0 3.3rem; }
  .case-copy { max-width: 680px; }
  .case-visual { width: min(680px,100%); }
  .case-grid { grid-template-columns: 1fr; gap: 2.4rem; }
}

@media (min-width: 821px) and (min-height: 700px) {
  .case-top { min-height: 100svh; display: flex; flex-direction: column; }
  .case-hero { flex: 1; }
}

@media (max-width: 560px) {
  .case-announcement { height: 32px; font-size: .72rem; }
  .case-nav { min-height: 64px; }
  .case-logo { font-size: .82rem; }
  .case-logo img { width: 27px; height: 27px; }
  .back-link { padding-inline: .8rem; font-size: .56rem; }
  .case-hero { gap: 1.5rem; padding: 1.35rem 0 2.7rem; }
  .case-hero h1 { margin-bottom: .55rem; font-size: clamp(1.65rem,9.2vw,2.2rem); line-height: .96; }
  .case-intro { font-size: .8rem; line-height: 1.5; }
  .case-visual { aspect-ratio: 16/10; border-radius: 14px; }
  .case-desktop { left: 1%; width: 90%; }
  .case-mobile { right: 1%; width: 30%; }
  .case-main { padding: 3rem 0; }
  .case-grid { gap: 2rem; }
  .case-cta-grid { align-items: stretch; flex-direction: column; gap: 1.4rem; }
  .case-button { width: 100%; }
  .case-footer { align-items: flex-start; flex-direction: column; padding: 1rem 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* Share buttons (Checklist Item #22) */
.share-bar {
  display: flex;
  align-items: center;
  gap: .65rem;
  margin-top: 1.25rem;
}
.share-label {
  font-size: .65rem;
  font-weight: 800;
  color: #8fa3ad;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .35rem .65rem;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.2);
  color: #e9f1f4;
  font-size: .62rem;
  font-weight: 800;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease;
}
.share-btn:hover, .share-btn:focus-visible {
  background: rgba(20,184,166,.2);
  border-color: var(--brand-bright);
  color: #fff;
  outline: none;
}
.share-btn svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

/* Floating WhatsApp CTA (Always visible) */
.mobile-whatsapp-sticky {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 99;
  display: flex;
  align-items: center;
  gap: .55rem;
  background: #25d366;
  color: #fff;
  font-size: .75rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: .04em;
  padding: .75rem 1.25rem;
  border-radius: 999px;
  box-shadow: 0 10px 25px rgba(37, 211, 102, .45), 0 4px 10px rgba(0, 0, 0, .12);
  transition: transform .2s ease, box-shadow .2s ease;
  text-decoration: none;
}
.mobile-whatsapp-sticky:hover, .mobile-whatsapp-sticky:focus-visible {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 30px rgba(37, 211, 102, .6), 0 6px 14px rgba(0, 0, 0, .18);
  outline: none;
  color: #fff;
}
.mobile-whatsapp-sticky:active {
  transform: translateY(-1px) scale(0.98);
}
.mobile-whatsapp-sticky svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
  display: block;
}
@media (max-width: 768px) {
  .mobile-whatsapp-sticky {
    bottom: 1.1rem;
    right: 1.1rem;
    padding: .7rem 1.1rem;
    font-size: .72rem;
  }
}