/* Casi d'uso, part 2: the ten chapters (claim, film, then «Prima / Con <nome> / Tu, intanto» as a three-column spec),
   the three moves and the closing call. Each chapter carries its own two hues (--h1, --h2) from the film. */
.cu-ch { position: relative; padding-block: clamp(84px, 10vw, 140px); scroll-margin-top: 104px; }
.cu-ch.alt { background: var(--bg-alt); }
.cu-head { max-width: 980px; margin: 0 auto clamp(36px, 4.5vw, 60px); text-align: center; }
.cu-kicker { display: inline-flex; align-items: center; gap: 10px; margin: 0 0 14px; font-size: clamp(15px, 1.4vw, 19px); font-weight: 600; letter-spacing: -.005em; color: var(--fg); }
.cu-n { display: inline-grid; place-items: center; min-width: 38px; height: 26px; padding: 0 9px; border-radius: 999px; color: #fff; font-size: 13px; font-weight: 650; font-variant-numeric: tabular-nums; background: linear-gradient(120deg, var(--h1), var(--h2)); }
.cu-claim { margin: 0; font-size: clamp(38px, 6vw, 80px); font-weight: 650; letter-spacing: -.035em; line-height: 1.03; text-wrap: balance; }
.cu-claim span { background: linear-gradient(100deg, var(--h1), var(--h2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.cu-film { position: relative; }
.cu-film::before { content: ""; position: absolute; inset: 8% 6% -6%; z-index: -1; border-radius: 40px; filter: blur(60px); opacity: .35;
  background: linear-gradient(120deg, var(--h1), var(--h2)); }
.cu-film .cu-frame { box-shadow: 0 30px 80px rgba(0, 0, 0, .14), 0 0 0 1px rgba(0, 0, 0, .04); }
.cu-film.rv.arm { transform: translateY(60px) scale(.96); }
.cu-film.rv.arm.in { transform: none; }

.cu-specs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: clamp(44px, 5vw, 72px); border-top: 1px solid var(--line); }
.cu-spec { padding: 28px clamp(18px, 2.6vw, 36px) 0; min-width: 0; }
.cu-spec + .cu-spec { border-left: 1px solid var(--line); }
.cu-spec:first-child { padding-left: 0; } .cu-spec:last-child { padding-right: 0; }
.cu-spec h3 { margin: 0 0 16px; font-size: 13px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--fg-2); }
.cu-spec.rv.arm:nth-child(2) { transition-delay: .12s; } .cu-spec.rv.arm:nth-child(3) { transition-delay: .24s; }

/* «Prima»: the pains get crossed out when the chapter is reached */
.cu-pains { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.cu-pains li { font-size: clamp(19px, 1.7vw, 23px); font-weight: 600; letter-spacing: -.02em; line-height: 1.3; color: var(--fg); transition: color .6s ease; transition-delay: calc(.5s + var(--i) * .35s); }
.cu-pains li span { background: linear-gradient(90deg, var(--h1), var(--h2)) no-repeat 0 58% / 0% 2.5px; -webkit-box-decoration-break: clone; box-decoration-break: clone;
  transition: background-size .8s var(--ease); transition-delay: inherit; }
.cu-pains.play li { color: #a1a1a6; }
.cu-pains.play li span { background-size: 100% 2.5px; }

.cu-who { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.cu-who img { width: 52px; height: 52px; border-radius: 50%; object-fit: contain; padding-top: 4px; background: radial-gradient(80% 80% at 50% 25%, #fff, color-mix(in srgb, var(--h1) 22%, #fff)); }
.cu-who b { display: block; font-size: 19px; font-weight: 600; letter-spacing: -.02em; line-height: 1.2; }
.cu-who span { font-size: 14px; color: var(--fg-2); }
.cu-steps { display: grid; gap: 9px; margin: 0; padding: 0; list-style: none; }
.cu-steps li { display: grid; grid-template-columns: 20px minmax(0, 1fr); gap: 10px; font-size: 16px; line-height: 1.35; }
.cu-steps li::before { content: ""; width: 20px; height: 20px; margin-top: 1px; border-radius: 50%;
  background: var(--green) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5.5 10.4l3 3 6-6.4' fill='none' stroke='%23fff' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 100% no-repeat; }
.cu-tools { display: flex; flex-wrap: nowrap; gap: 8px; margin-top: 18px; }
.cu-tool { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; background: #fff; box-shadow: 0 1px 2px rgba(0, 0, 0, .08), 0 0 0 1px rgba(0, 0, 0, .05); }
.cu-tool svg { width: 22px; height: 22px; }
.cu-tool:empty { display: none; }
.cu-freed { margin: 0; font-size: clamp(26px, 2.6vw, 36px); font-weight: 650; letter-spacing: -.03em; line-height: 1.12; text-wrap: balance; }
.cu-rule { display: flex; gap: 10px; align-items: flex-start; margin: 22px 0 0; font-size: 15px; line-height: 1.4; color: var(--fg-2); }
.cu-rule svg { flex: none; width: 20px; height: 20px; fill: none; stroke: var(--green); stroke-width: 1.8; stroke-linejoin: round; stroke-linecap: round; margin-top: 1px; }

/* three moves */
.cu-how { overflow: hidden; }
.cu-moves { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(14px, 1.6vw, 22px); margin-top: clamp(48px, 5vw, 76px); }
.cu-move { display: flex; flex-direction: column; padding: clamp(26px, 2.6vw, 36px); border-radius: 28px; background: var(--k-card); min-width: 0; }
.cu-mn { margin: 0 0 18px; font-size: 15px; font-weight: 600; background: var(--ai); -webkit-background-clip: text; background-clip: text; color: transparent; }
.cu-move h3 { margin: 0; font-size: clamp(26px, 2.4vw, 32px); font-weight: 650; letter-spacing: -.03em; line-height: 1.1; }
.cu-move > p:not(.cu-mn) { margin: 12px 0 0; color: var(--k-fg-2); font-size: 17px; line-height: 1.45; }
.cu-mock { margin-top: auto; padding-top: 30px; }
.cu-mock-ask { display: flex; align-items: center; gap: 10px; }
.cu-mock-ask span { flex: 1; padding: 13px 16px; border-radius: 20px; background: #2c2c2e; color: #f5f5f7; font-size: 15px; line-height: 1.35; }
.cu-mock-ask i { flex: none; width: 36px; height: 36px; border-radius: 50%; background: var(--blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 18V6m-5 5l5-5 5 5' fill='none' stroke='%23fff' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 22px no-repeat; }
.cu-mock-tools { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 10px; }
.cu-mock-tools .cu-tool { width: auto; height: auto; aspect-ratio: 1; border-radius: 14px; }
.cu-mock-tools .cu-tool svg { width: 28px; height: 28px; }
.cu-mock-ok { display: grid; gap: 14px; }
.cu-mock-ok b { font-size: 17px; font-weight: 600; letter-spacing: -.02em; }
.cu-mock-ok span { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.cu-mock-ok em, .cu-mock-ok strong { display: grid; place-items: center; height: 44px; border-radius: 14px; font-style: normal; font-size: 15px; font-weight: 600; }
.cu-mock-ok em { background: #2c2c2e; } .cu-mock-ok strong { background: var(--blue); color: #fff; }
.cu-moves.arm .cu-move { opacity: 0; transform: translateY(40px); }
.cu-moves.play .cu-move { animation: cuMember 1s var(--ease) both; animation-delay: calc(var(--i) * 120ms); }
.cu-moves.play .cu-mock-ok strong { animation: cuTap 3.6s 1.4s var(--ease) infinite; }
@keyframes cuTap { 0%, 70%, 100% { transform: none; } 76% { transform: scale(.94); } 82% { transform: none; background: var(--green); } 96% { background: var(--green); } }

.cu-end { padding-block: clamp(110px, 14vw, 190px); text-align: center; overflow: hidden; }
.cu-cta { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 14px 30px; margin: 36px 0 0; }

@media (min-width: 835px) and (max-width: 1180px) { .cu-mock-tools { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 834px) {
  .cu-specs { grid-template-columns: minmax(0, 1fr); border-top: 0; }
  .cu-spec, .cu-spec:first-child, .cu-spec:last-child { padding: 24px 0 0; border-top: 1px solid var(--line); }
  .cu-spec + .cu-spec { border-left: 0; margin-top: 24px; }
  .cu-moves { grid-template-columns: minmax(0, 1fr); }
  .cu-ch { scroll-margin-top: 100px; }
}
@media (prefers-reduced-motion: reduce) {
  .cu-pains li, .cu-pains li span { transition: none; }
  .cu-moves .cu-move { opacity: 1 !important; transform: none !important; animation: none !important; }
  .cu-moves.play .cu-mock-ok strong { animation: none; }
}