:root{
  --ivs-bg:#FBFBFD;
  --ivs-surface:#FFFFFF;
  --ivs-surface-2:#F5F5F7;
  --ivs-ink:#1D1D1F;
  --ivs-ink-soft:#6E6E73;
  --ivs-line:#E3E3E7;
  --ivs-accent:#0A84FF;
  --ivs-accent2:#BF5AF2;
  --ivs-accent3:#FF375F;
  --ivs-accent-ink:#FFFFFF;
  --ivs-frame:#1D1D1F;
  --ivs-gradient:linear-gradient(100deg,var(--ivs-accent) 0%,var(--ivs-accent2) 55%,var(--ivs-accent3) 100%);
}
body{
  background:
    radial-gradient(900px 480px at 8% -8%, rgba(10,132,255,.09), transparent 60%),
    radial-gradient(760px 460px at 100% 0%, rgba(255,55,95,.08), transparent 60%),
    radial-gradient(720px 480px at 50% 100%, rgba(191,90,242,.07), transparent 60%),
    var(--ivs-bg);
  color:var(--ivs-ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  min-height:100vh;
}
h1,h2,h3,.ivs-serif{font-family:inherit;font-weight:600;letter-spacing:-0.02em;}
a{color:var(--ivs-accent);text-decoration:none;}
a:hover{color:var(--ivs-accent2);}
.ivs-navbar{background:rgba(251,251,253,.82);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--ivs-line);}
.navbar-brand{font-weight:600;color:var(--ivs-ink);}
.navbar-brand i{background:var(--ivs-gradient);-webkit-background-clip:text;background-clip:text;color:transparent;}
.nav-link{color:var(--ivs-ink-soft);font-weight:500;}
.nav-link:hover{color:var(--ivs-ink);}
.ivs-card{
  background:var(--ivs-surface);
  border:1px solid var(--ivs-line);
  border-radius:18px;
}
.btn{border-radius:980px;font-weight:600;}
.btn-dark{background:var(--ivs-gradient);border:none;color:var(--ivs-accent-ink);box-shadow:0 8px 20px -8px rgba(191,90,242,.55);}
.btn-dark:hover{filter:brightness(1.06);color:var(--ivs-accent-ink);}
.btn-outline-dark{color:var(--ivs-ink);border-color:var(--ivs-line);}
.btn-outline-dark:hover{background:var(--ivs-ink);color:#fff;border-color:var(--ivs-ink);}
.form-control{
  font-family:inherit;
  background:var(--ivs-surface);
  border:1px solid var(--ivs-line);
  color:var(--ivs-ink);
  border-radius:12px;
}
.form-control::placeholder{color:#A1A1A6;}
.form-control:focus{background:#fff;color:var(--ivs-ink);border-color:var(--ivs-accent);box-shadow:0 0 0 4px rgba(10,132,255,.15);}
.ivs-footer{background:var(--ivs-surface-2);border-top:1px solid var(--ivs-line);}
.ivs-footer a{color:var(--ivs-ink-soft);text-decoration:none;font-size:.9rem;}
.ivs-footer a:hover{color:var(--ivs-accent);}
.border-dark{border-color:var(--ivs-accent)!important;}
.text-secondary{color:var(--ivs-ink-soft)!important;}
.alert{color:var(--ivs-ink);}

.section-eyebrow{color:var(--ivs-ink-soft);font-size:.85rem;}
.feature-row{border-top:1px solid var(--ivs-line);padding:20px 0;}
.faq-item summary{cursor:pointer;font-weight:600;padding:14px 0;color:var(--ivs-ink);}
.faq-item{border-bottom:1px solid var(--ivs-line);}

/* ===== Hero: interactive iPhone Duo fold preview ===== */
.hero-section{padding:64px 0 32px;text-align:center;}
.hero-title{font-size:clamp(2.1rem,4.6vw,3.2rem);margin-bottom:14px;}
.hero-sub{color:var(--ivs-ink-soft);max-width:540px;margin:0 auto;font-size:1.05rem;}

.hero-url-form{display:flex;max-width:420px;margin:26px auto 0;}
.hero-url-form .form-control{text-align:center;margin-right:8px;}

.fold-showcase{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:center;
  margin:40px auto 0;max-width:900px;
}
.fold-showcase>*{margin:14px;}

.fold-card{
  background:var(--ivs-surface-2);
  border-radius:24px;
  padding:30px 32px;
  text-align:left;
  width:100%;
  max-width:380px;
}
.fold-card-text{font-size:1.15rem;line-height:1.4;color:var(--ivs-ink);margin-bottom:20px;}
.fold-card-text strong{font-weight:600;}
.fold-card-hint{font-size:.85rem;color:var(--ivs-ink-soft);margin-bottom:16px;}
.fold-track{position:relative;height:14px;border-radius:999px;background:#E3E3E7;cursor:pointer;touch-action:none;}
.fold-handle{
  position:absolute;top:50%;width:48px;height:48px;border-radius:50%;
  background:var(--ivs-accent);border:none;color:#fff;font-size:18px;
  display:flex;align-items:center;justify-content:center;padding:0;
  transform:translate(-50%,-50%);cursor:grab;
  box-shadow:0 8px 18px -4px rgba(10,132,255,.55);
}
.fold-handle:active{cursor:grabbing;}

.duo-stage{display:flex;justify-content:center;padding:10px 0;perspective:1700px;}
.duo-book{
  position:relative;width:440px;height:320px;
  transform-style:preserve-3d;
}
.duo-panel{
  position:absolute;top:0;width:220px;height:320px;
  background:linear-gradient(152deg,#eae5d8 0%,#b9b3a3 12%,#9d9788 50%,#b9b3a3 88%,#f2ede0 100%);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.5),0 26px 46px -20px rgba(29,29,31,.4);
}
.duo-panel-left{left:0;border-radius:30px 0 0 30px;}
.duo-panel-right{
  left:220px;border-radius:0 30px 30px 0;
  transform-origin:left center;transform:rotateY(-172deg);
  transition:transform .1s linear;
}
.duo-book.no-anim .duo-panel-right{transition:none;}
.duo-shade{position:absolute;inset:0;background:#000;opacity:0;border-radius:inherit;}
.duo-hinge{
  position:absolute;left:217px;top:7px;bottom:7px;width:6px;
  background:linear-gradient(90deg,rgba(0,0,0,0),rgba(0,0,0,.5) 45%,rgba(0,0,0,.5) 55%,rgba(0,0,0,0));
  border-radius:3px;z-index:2;pointer-events:none;
}
.duo-idle{
  position:absolute;top:8px;left:8px;width:204px;bottom:8px;
  border-radius:22px;overflow:hidden;z-index:8;pointer-events:none;
  background:linear-gradient(180deg,#7fa8c9 0%,#a9c3d4 20%,#d6c7b6 42%,#c8a587 62%,#ab8567 82%,#8f6a4e 100%);
  transition:opacity .3s ease;
}
.duo-idle-camera{
  position:absolute;top:10px;right:12px;width:10px;height:10px;border-radius:50%;
  background:radial-gradient(circle at 35% 35%,#3a3a3c,#000 70%);
  box-shadow:0 0 0 1.5px rgba(255,255,255,.25);
}
.duo-idle-wifi{
  position:absolute;top:26px;right:10px;width:22px;height:22px;border-radius:50%;
  background:rgba(255,255,255,.22);color:#fff;font-size:11px;
  display:flex;align-items:center;justify-content:center;
}
.duo-idle-date{position:absolute;left:14px;top:14px;color:#fff;font-size:11px;font-weight:600;text-shadow:0 1px 6px rgba(0,0,0,.25);}
.duo-idle-time{position:absolute;left:12px;top:26px;color:#fff;font-size:34px;font-weight:600;letter-spacing:-.03em;text-shadow:0 2px 10px rgba(0,0,0,.25);}
.duo-idle-actions{position:absolute;right:10px;bottom:26px;display:flex;flex-direction:column;}
.duo-idle-btn{
  width:20px;height:20px;border-radius:50%;background:rgba(255,255,255,.22);
  color:#fff;font-size:10px;display:flex;align-items:center;justify-content:center;
  margin-bottom:8px;
}
.duo-idle-home{position:absolute;bottom:6px;left:50%;transform:translateX(-50%);width:70px;height:3px;border-radius:2px;background:rgba(255,255,255,.6);}
.duo-screen-half{
  position:absolute;top:8px;left:8px;bottom:8px;width:204px;
  border-radius:22px;overflow:hidden;background:#fff;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.1);z-index:5;
}
.duo-screen-half iframe{position:absolute;top:0;left:0;border:0;background:#fff;transform-origin:top left;}
.duo-sheen{
  position:absolute;inset:0;z-index:9;pointer-events:none;
  background:linear-gradient(115deg,rgba(255,255,255,.16) 0%,rgba(255,255,255,0) 20%,rgba(255,255,255,0) 80%,rgba(255,255,255,.08) 100%);
}
.fold-home-indicator{position:absolute;bottom:8px;left:50%;transform:translateX(-50%);width:100px;height:4px;border-radius:2px;background:rgba(255,255,255,.5);z-index:2;}
.fold-empty{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;text-align:center;padding:0 24px;font-size:12px;color:#8A8C90;background:var(--ivs-surface-2);z-index:1;}

.hero-ctas{margin-top:8px;display:flex;justify-content:center;flex-wrap:wrap;}
.hero-ctas>*{margin:0 5px;}

@media (max-width:520px){
  .duo-book{transform:scale(.8);}
  .duo-stage{margin:-32px 0;}
}
@media (max-width:380px){
  .duo-book{transform:scale(.68);}
  .duo-stage{margin:-52px 0;}
}