/* ============================================================
   SMARTONE — Cinematic 3D-style intro (igloo.inc inspired)
   Full-screen Hong Kong "city rising" film with Skip control.
   Only loaded on the homepage (index.html).
   ============================================================ */

:root{
  --intro-navy:#08213c;
  --intro-gold:#4fb0ee;   /* sky-blue accent for the intro */
}

/* lock the page while the film plays */
body.intro-lock{ overflow:hidden; height:100vh; }

#intro{
  position:fixed; inset:0; z-index:9999;
  background:var(--intro-navy);
  overflow:hidden;
  display:flex; align-items:flex-end;
  opacity:1; visibility:visible;
  transition:opacity 1s cubic-bezier(.4,0,.2,1), visibility 1s;
  cursor:default;
  -webkit-font-smoothing:antialiased;
}
#intro.is-done{ opacity:0; visibility:hidden; pointer-events:none; }

/* ---- the film ---- */
.intro-stage{ position:absolute; inset:0; overflow:hidden; }
.intro-video{
  position:absolute; top:50%; left:50%;
  width:100%; height:100%;
  min-width:100%; min-height:100%;
  transform:translate(-50%,-50%) scale(1.06);
  object-fit:cover;
  will-change:transform;
  animation:introZoom 11s ease-out forwards;
}
@keyframes introZoom{ from{ transform:translate(-50%,-50%) scale(1.12);} to{ transform:translate(-50%,-50%) scale(1.0);} }

/* cinematic letterbox + vignette + bottom gradient for legibility */
.intro-grad{
  position:absolute; inset:0; pointer-events:none;
  background:
    linear-gradient(180deg, rgba(6,13,24,.55) 0%, rgba(6,13,24,0) 22%, rgba(6,13,24,0) 55%, rgba(6,13,24,.78) 100%),
    radial-gradient(120% 80% at 50% 42%, rgba(6,13,24,0) 45%, rgba(6,13,24,.6) 100%);
}
/* film grain */
.intro-grain{
  position:absolute; inset:-50%; pointer-events:none; opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:introGrain .5s steps(2) infinite;
  mix-blend-mode:overlay;
}
@keyframes introGrain{ 0%{transform:translate(0,0)} 100%{transform:translate(-4%,3%)} }

/* top cinematic bar holding brand + skip */
.intro-topbar{
  position:absolute; top:0; left:0; right:0; z-index:3;
  display:flex; align-items:center; justify-content:space-between;
  padding:clamp(18px,3vw,34px) clamp(20px,4vw,52px);
}
.intro-mark{
  font-family:"Manrope",system-ui,sans-serif;
  font-weight:800; letter-spacing:.04em;
  font-size:clamp(20px,2.4vw,30px); color:#fff;
  opacity:0; transform:translateY(-12px);
  animation:introFade .9s .3s ease forwards;
  text-shadow:0 2px 18px rgba(0,0,0,.5);
}
.intro-mark i{ color:var(--intro-gold); font-style:normal; }

/* ---- Skip button ---- */
.intro-skip{
  position:relative; z-index:5;
  display:inline-flex; align-items:center; gap:10px;
  padding:11px 20px; border-radius:100px;
  font-family:"Manrope",system-ui,sans-serif;
  font-weight:700; font-size:14px; letter-spacing:.02em;
  color:#fff; cursor:pointer;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.28);
  backdrop-filter:blur(10px); -webkit-backdrop-filter:blur(10px);
  transition:background .25s, border-color .25s, transform .25s, color .25s;
  opacity:0; animation:introFade .8s 1s ease forwards;
}
.intro-skip:hover{
  background:var(--intro-gold); border-color:var(--intro-gold);
  color:#10233f; transform:translateY(-1px);
}
.intro-skip svg{ width:15px; height:15px; }
/* countdown ring around skip */
.intro-skip .ring{ width:18px; height:18px; transform:rotate(-90deg); }
.intro-skip .ring circle{ fill:none; stroke-width:3; }
.intro-skip .ring .bg{ stroke:rgba(255,255,255,.25); }
.intro-skip .ring .fg{ stroke:currentColor; stroke-linecap:round;
  stroke-dasharray:44; stroke-dashoffset:var(--ring,44); transition:stroke-dashoffset .2s linear; }

/* ---- centre tagline ---- */
.intro-center{
  position:absolute; left:0; right:0; top:50%; transform:translateY(-50%);
  z-index:2; text-align:center; padding:0 24px; pointer-events:none;
}
.intro-logo{
  width:clamp(170px,25vw,330px); height:auto; margin:0 auto 24px; display:block;
  filter:drop-shadow(0 8px 30px rgba(0,0,0,.55));
  opacity:0; transform:translateY(16px) scale(.95);
  animation:introFade 1s .35s cubic-bezier(.16,1,.3,1) forwards;
}
.intro-eyebrow{
  display:inline-block; font-family:"Manrope",sans-serif; font-weight:700;
  letter-spacing:.42em; text-transform:uppercase;
  font-size:clamp(10px,1vw,13px); color:var(--intro-gold);
  text-shadow:0 2px 16px rgba(6,13,24,.8);
  margin-bottom:18px; opacity:0; animation:introFade 1s .95s ease forwards;
}
.intro-headline{
  font-family:"Pretendard Variable",Pretendard,system-ui,sans-serif;
  font-weight:800; color:#fff; line-height:1.18;
  font-size:clamp(26px,4.6vw,62px);
  text-shadow:0 4px 40px rgba(0,0,0,.55);
  margin:0;
}
.intro-headline .line{ display:block; overflow:hidden; }
.intro-headline .line > span{
  display:inline-block; transform:translateY(115%);
  animation:introRise 1.1s cubic-bezier(.16,1,.3,1) forwards;
}
.intro-headline .line:nth-child(1) > span{ animation-delay:1.1s; }
.intro-headline .line:nth-child(2) > span{ animation-delay:1.25s; }
.intro-headline em{ color:var(--intro-gold); font-style:normal; }

/* ---- HQ lower-third (the company building call-out) ---- */
.intro-hq{
  position:absolute; left:clamp(20px,4vw,52px); bottom:clamp(48px,7vh,86px);
  z-index:4; max-width:min(86vw,440px);
  display:flex; gap:14px; align-items:flex-start;
  padding:16px 20px; border-radius:16px;
  background:linear-gradient(180deg, rgba(11,31,58,.62), rgba(6,13,24,.72));
  border:1px solid rgba(201,162,39,.4);
  backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px);
  box-shadow:0 18px 50px rgba(0,0,0,.45);
  opacity:0; transform:translateX(-26px);
  transition:opacity .9s ease, transform .9s cubic-bezier(.16,1,.3,1);
  color:#eaf0fb;
}
.intro-hq.show{ opacity:1; transform:translateX(0); }
.intro-hq .pin{ position:relative; flex:0 0 auto; margin-top:3px; }
.intro-hq .pin span{
  display:block; width:11px; height:11px; border-radius:50%;
  background:var(--intro-gold); box-shadow:0 0 0 0 rgba(201,162,39,.6);
  animation:introPulse 1.8s ease-out infinite;
}
.intro-hq b{ display:block; font-family:"Manrope",sans-serif; font-size:14px; color:#fff; margin-bottom:3px; letter-spacing:.01em; }
.intro-hq small{ display:block; font-size:12.5px; line-height:1.5; color:#b9c6dc; }
@keyframes introPulse{
  0%{ box-shadow:0 0 0 0 rgba(201,162,39,.55);} 70%{ box-shadow:0 0 0 12px rgba(201,162,39,0);} 100%{ box-shadow:0 0 0 0 rgba(201,162,39,0);}
}

/* ---- progress bar ---- */
.intro-progress{
  position:absolute; left:0; right:0; bottom:0; height:3px; z-index:4;
  background:rgba(255,255,255,.12);
}
.intro-progress i{
  display:block; height:100%; width:var(--p,0%);
  background:linear-gradient(90deg,#e7c65a,var(--intro-gold));
  box-shadow:0 0 12px rgba(201,162,39,.7);
  transition:width .15s linear;
}

/* tiny "scroll to enter" hint after film */
.intro-hint{
  position:absolute; left:50%; bottom:26px; transform:translateX(-50%);
  z-index:4; color:#cdd8ec; font-family:"Manrope",sans-serif; font-weight:600;
  font-size:12px; letter-spacing:.28em; text-transform:uppercase;
  opacity:0; pointer-events:none;
}

@keyframes introFade{ to{ opacity:1; transform:none; } }
@keyframes introRise{ to{ transform:translateY(0); } }

/* ---- responsive ---- */
@media (max-width:640px){
  .intro-hq{ left:14px; right:14px; max-width:none; bottom:54px; }
  .intro-skip span.label{ display:none; }
  .intro-skip{ padding:10px 14px; }
}

/* ---- accessibility: reduced motion ---- */
@media (prefers-reduced-motion:reduce){
  .intro-video,.intro-grain{ animation:none; }
  .intro-headline .line > span{ animation:none; transform:none; }
  .intro-mark,.intro-skip,.intro-eyebrow{ animation:none; opacity:1; transform:none; }
}