:root{
  --fg:#0d0c0b;
  --fg-soft:rgba(13,12,11,.64);
  --fg-faint:rgba(13,12,11,.42);
  --shade:#f2f0ec;
  --rule:rgba(13,12,11,.16);
  --ease:cubic-bezier(.22,.61,.36,1);
  --pill-bg:#0a0908;
  --pill-fg:#ffffff;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--shade);
  color:var(--fg);
  font-family:'Inter Tight','Helvetica Neue',Helvetica,Arial,sans-serif;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
/* ── fixed background video layer ─────────────────────────────────── */
.stage{position:fixed;inset:0;z-index:0;overflow:hidden;background:var(--shade)}
.stage video{
  position:absolute;top:50%;left:50%;width:100%;height:100%;
  transform:translate(-50%,-50%) scale(1.02);
  object-fit:cover;filter:contrast(1.02);will-change:transform;
}
/* the footage is high-key white, so this is a deliberately light wash,
   heavier at the top and bottom edges where nav and footer sit */
.veil{
  position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(to bottom, rgba(242,240,236,.62) 0%, rgba(242,240,236,.12) 22%, rgba(242,240,236,.12) 78%, rgba(242,240,236,.66) 100%),
    radial-gradient(100% 80% at 50% 48%, rgba(242,240,236,0) 0%, rgba(242,240,236,.34) 100%),
    rgba(242,240,236,.20);
}
/* fine SVG turbulence noise so the flat wash doesn't band */
.grain{
  position:absolute;inset:-50%;opacity:.13;mix-blend-mode:multiply;pointer-events:none;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='140' height='140'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/></filter><rect width='140' height='140' filter='url(%23n)' opacity='.5'/></svg>");
}
/* ── fixed chrome ─────────────────────────────────────────────────── */
.chrome{
  position:fixed;left:0;right:0;top:0;z-index:40;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:max(14px, calc(env(safe-area-inset-top, 0px) + 12px)) clamp(16px, 3.4vw, 44px) 14px;
  background:linear-gradient(to bottom, rgba(242,240,236,.94) 0%, rgba(242,240,236,.78) 72%, rgba(242,240,236,0) 100%);
}
.mark{
  display:flex;align-items:center;gap:9px;font-size:15px;letter-spacing:-.012em;
  color:var(--fg);min-width:0;flex-shrink:1;
}
.mark-star{opacity:.85}
.nav{display:flex;align-items:center;gap:clamp(14px, 2.4vw, 32px);flex-shrink:0}
.nav a:not(.pill){
  color:var(--fg);text-decoration:none;font-size:14.5px;letter-spacing:-.008em;
  opacity:.88;transition:opacity .3s var(--ease);
}
.nav a:not(.pill):hover{opacity:1}
.pill{
  display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 21px;
  border-radius:999px;background:var(--pill-bg);color:var(--pill-fg);
  font-size:14.5px;font-weight:500;letter-spacing:-.008em;text-decoration:none;
  white-space:nowrap;opacity:1;border:1px solid rgba(10,9,8,.12);
  box-shadow:0 1px 0 rgba(255,255,255,.10) inset;
  -webkit-text-fill-color:var(--pill-fg);
  transition:transform .4s var(--ease), background .3s var(--ease), color .3s var(--ease);
}
/* required so the nav's inherited link colour never bleeds into the dark pill */
.nav .pill{color:#fff;-webkit-text-fill-color:#fff}
.pill:hover,.pill:focus-visible{
  transform:translateY(-2px);background:#000;color:#fff;-webkit-text-fill-color:#fff;
}
.pill:focus-visible{outline:2px solid var(--fg);outline-offset:2px}
.foot{
  position:fixed;bottom:0;left:0;right:0;z-index:40;display:flex;justify-content:center;
  padding:14px clamp(16px, 4vw, 24px) max(16px, calc(env(safe-area-inset-bottom, 0px) + 12px));
  font-size:12px;line-height:1.45;letter-spacing:.02em;color:var(--fg-faint);
  text-align:center;pointer-events:none;
  background:linear-gradient(to top, rgba(242,240,236,.92) 0%, rgba(242,240,236,.72) 72%, rgba(242,240,236,0) 100%);
}
.meter{
  position:fixed;top:0;left:0;z-index:50;height:2px;width:100%;
  transform:scaleX(0);transform-origin:0 50%;background:var(--fg);opacity:.55;
}
/* ── panel layer ──────────────────────────────────────────────────── */
.panels{position:fixed;inset:0;z-index:20;pointer-events:none}
.panel{
  position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;
  justify-content:center;text-align:center;
  padding:max(104px, calc(env(safe-area-inset-top, 0px) + 88px)) clamp(20px, 5vw, 60px) max(96px, calc(env(safe-area-inset-bottom, 0px) + 80px));
  opacity:0;will-change:opacity,transform;
}
.eyebrow{
  display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:6px 12px;
  font-size:12.5px;letter-spacing:.045em;color:var(--fg-soft);
  margin-bottom:clamp(16px,2vw,22px);max-width:min(46ch, 100%);text-align:center;
}
.panel h1{
  font-weight:400;font-size:clamp(34px, 7.1vw, 104px);line-height:.98;
  letter-spacing:-.036em;max-width:15ch;text-wrap:balance;
}
.sub{
  margin-top:clamp(18px,2.2vw,28px);font-size:clamp(15px,1.28vw,19px);line-height:1.5;
  letter-spacing:-.008em;color:var(--fg-soft);max-width:min(46ch, 100%);text-wrap:pretty;
}
/* pointer-events 由 .panel 控制（JS 按激活状态切换），.cta 继承即可 */
.cta{margin-top:clamp(28px,3.4vw,44px);width:100%;display:flex;justify-content:center}
.cta .pill{height:48px;padding:0 27px;font-size:15px;max-width:min(100%, 320px)}
/* closing panel: the project's own stills and demo film, still inside the scrub */
.reel{width:100%;max-width:min(820px, 100%)}
.reel-grid{display:grid;grid-template-columns:repeat(3, 1fr);gap:10px}
.reel-grid img{
  display:block;width:100%;height:clamp(84px, 15vh, 158px);object-fit:cover;
  border:1px solid var(--rule);border-radius:10px;background:#fff;
}
.reel-video{
  margin-top:12px;border:1px solid var(--rule);border-radius:14px;
  overflow:hidden;background:#0d0c0b;
}
.reel-video video{display:block;width:100%;aspect-ratio:16 / 9;background:#0d0c0b}
.reel-note{margin-top:12px;font-size:12px;letter-spacing:.03em;color:var(--fg-faint)}
/* ── preloader ────────────────────────────────────────────────────── */
.boot{
  position:fixed;inset:0;z-index:90;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:16px;background:var(--shade);
  transition:opacity .7s var(--ease), visibility .7s;
}
.boot.done{opacity:0;visibility:hidden}
.boot p{font-size:12.5px;letter-spacing:.05em;color:var(--fg-faint)}
.bar{width:150px;height:1px;background:var(--rule);overflow:hidden}
.bar i{display:block;height:100%;width:100%;background:var(--fg);transform:scaleX(0);transform-origin:0 50%}
/* ── the only thing that gives the page height ────────────────────── */
.track{position:relative;z-index:1;height:560vh;height:560svh;min-height:3200px}
/* ── responsive ───────────────────────────────────────────────────── */
/* small, bright screens need a stronger wash so dark type stays legible */
@media (max-width:900px){
  .veil{
    background:
      linear-gradient(to bottom, rgba(242,240,236,.72) 0%, rgba(242,240,236,.18) 24%, rgba(242,240,236,.18) 76%, rgba(242,240,236,.74) 100%),
      radial-gradient(100% 80% at 50% 48%, rgba(242,240,236,0) 0%, rgba(242,240,236,.40) 100%),
      rgba(242,240,236,.24);
  }
}
@media (max-width:720px){
  .nav a:not(.pill){display:none}
  .mark{font-size:14px}
  .nav .pill{height:38px;padding:0 16px;font-size:13.5px}
  .panel h1{max-width:12ch;font-size:clamp(30px, 9.8vw, 52px)}
  .sub{font-size:15px;max-width:34ch}
  .panel{padding:max(92px, calc(env(safe-area-inset-top, 0px) + 76px)) 18px max(88px, calc(env(safe-area-inset-bottom, 0px) + 72px))}
  .foot{font-size:11px;max-width:34ch}
  .reel-grid img{height:clamp(72px, 11vh, 112px)}
  /* 移动端：grain 的 mix-blend-mode 会与视频逐帧重新合成，改为普通叠加 */
  .grain{mix-blend-mode:normal;opacity:.07}
}
@media (max-width:420px){
  .mark-star{display:none}
  .nav .pill{height:36px;padding:0 14px;font-size:13px}
  .panel h1{max-width:11ch;font-size:clamp(28px, 10.5vw, 40px)}
  .eyebrow{font-size:11px;letter-spacing:.04em;max-width:28ch}
  .cta .pill{width:100%;max-width:280px;height:44px;padding:0 20px;font-size:14px}
  .reel-grid{gap:6px}
  .reel-grid img{height:62px;border-radius:8px}
}
@media (max-height:520px) and (orientation:landscape){
  .panel{padding:max(72px, calc(env(safe-area-inset-top, 0px) + 56px)) 24px max(64px, calc(env(safe-area-inset-bottom, 0px) + 48px))}
  .panel h1{font-size:clamp(28px, 8vh, 44px)}
  .sub{margin-top:12px;font-size:14px}
  .cta{margin-top:16px}
  .reel-grid{display:none}
  .reel-video{margin-top:0}
}
/* ── detail modal：把原详情正文折进弹窗，信息不丢 ─────────────────── */
.modal{
  position:fixed;inset:0;z-index:60;display:flex;align-items:center;justify-content:center;
  padding:max(20px, env(safe-area-inset-top)) 20px max(20px, env(safe-area-inset-bottom));
  background:rgba(13,12,11,.55);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  opacity:0;visibility:hidden;transition:opacity .35s var(--ease), visibility .35s;
}
.modal[aria-hidden="false"]{opacity:1;visibility:visible}
.modal__card{
  position:relative;width:min(760px,100%);
  max-height:calc(100vh - 40px);max-height:calc(100dvh - 40px);
  overflow:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;
  background:#f8f7f4;border-radius:20px;padding:clamp(24px,4.6vw,40px);
  box-shadow:0 28px 80px rgba(9,9,8,.28);
  transform:translateY(18px) scale(.98);transition:transform .35s var(--ease);
  will-change:transform;
}
.modal[aria-hidden="false"] .modal__card{transform:translateY(0) scale(1)}
.modal__close{
  position:absolute;top:12px;right:12px;width:40px;height:40px;border-radius:50%;border:0;
  background:transparent;cursor:pointer;display:flex;align-items:center;justify-content:center;
  color:var(--fg);transition:background .2s;
}
.modal__close:hover,.modal__close:focus-visible{background:rgba(13,12,11,.08)}
.modal__close:focus-visible{outline:2px solid var(--fg);outline-offset:2px}
.modal__title{font-size:clamp(22px,3.2vw,30px);letter-spacing:-.024em;margin-bottom:18px;color:var(--fg)}
.modal__body{color:var(--fg-soft);font-size:15px;line-height:1.65}
.modal__body p + p{margin-top:1.1em}
.modal__sub{margin:22px 0 0;font-size:12.5px;letter-spacing:.05em;color:var(--fg-faint);text-transform:uppercase}
.spec-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:18px 0 4px}
.spec-item{background:#fff;border:1px solid var(--rule);border-radius:12px;padding:14px}
.spec-item dt{font-size:11.5px;letter-spacing:.04em;color:var(--fg-faint);text-transform:uppercase;margin-bottom:5px}
.spec-item dd{font-size:14px;color:var(--fg);line-height:1.4}
.bullet-list{list-style:none;margin:14px 0 0;display:grid;gap:10px}
.bullet-list li{position:relative;background:#fff;border:1px solid var(--rule);border-radius:12px;padding:12px 14px 12px 36px;font-size:14px;line-height:1.5;color:var(--fg)}
.bullet-list li::before{content:"";position:absolute;left:14px;top:17px;width:8px;height:8px;border-radius:50%;background:#00fe8d}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.tag{font-size:12.5px;letter-spacing:.02em;padding:7px 12px;border:1px solid var(--rule);border-radius:999px;background:#fff;color:var(--fg)}
.modal__highlight{margin-top:18px;padding:16px 18px;border-radius:12px;background:var(--pill-bg);color:#fff;font-size:14.5px;line-height:1.55}
@media (max-width:720px){
  /* 弹窗实时模糊叠在滚动视频上代价高，小屏改实心遮罩 */
  .modal{background:rgba(13,12,11,.62);backdrop-filter:none;-webkit-backdrop-filter:none}
}
@media (max-width:540px){
  .spec-grid{grid-template-columns:1fr}
  /* 手机：弹窗改为从底部升起的面板 */
  .modal{align-items:flex-end;padding:0}
  .modal__card{
    width:100%;max-width:none;max-height:88vh;max-height:88dvh;
    border-radius:20px 20px 0 0;
    padding:24px 18px calc(24px + env(safe-area-inset-bottom));
    transform:translateY(100%);
  }
  .modal__close{top:8px;right:8px}
  .modal__title{padding-right:44px}
}
/* 弱机降级（JS 依据实测帧率挂 is-lowfx）：关掉颗粒等装饰层 */
html.is-lowfx .grain{display:none}
html.is-lowfx .veil{background:rgba(242,240,236,.34)}