:root{
  --bg:#000;
  --surface:#0e0e11;
  --surface-2:#17171c;
  --line:rgba(255,255,255,.12);
  --txt:#fff;
  --muted:rgba(255,255,255,.6);
  --cyan:#00f2ea;
  --pink:#ff2d55;
  --nav:72px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:
    radial-gradient(900px 600px at 15% 0%,rgba(0,242,234,.16),transparent 60%),
    radial-gradient(900px 600px at 85% 100%,rgba(255,45,85,.18),transparent 60%),
    #050507;
  color:var(--txt);
  font-family:"Helvetica Neue",Inter,system-ui,-apple-system,Segoe UI,sans-serif;
  -webkit-font-smoothing:antialiased;
  display:grid;place-items:center;
  overflow:hidden;
}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input{font:inherit}
svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}

/* ---------- shell ---------- */
.phone{
  position:relative;width:min(100vw,460px);height:min(100dvh,940px);
  background:var(--bg);overflow:hidden;display:flex;flex-direction:column;
  isolation:isolate;
}
@media (min-width:520px) and (min-height:720px){
  .phone{border-radius:34px;border:1px solid rgba(255,255,255,.14);
    box-shadow:0 0 0 1px rgba(0,0,0,.6),0 40px 120px rgba(0,242,234,.18),0 10px 60px rgba(255,45,85,.18)}
}

/* ---------- top bar ---------- */
.topbar{
  position:absolute;top:0;left:0;right:0;z-index:20;
  display:flex;align-items:center;gap:10px;padding:14px 14px 26px;
  background:linear-gradient(#000c,transparent);pointer-events:none;
}
.topbar>*{pointer-events:auto}
.brand{display:flex;align-items:center;gap:7px;min-width:78px}
.logo{position:relative;width:20px;height:20px;display:block}
.logo i{position:absolute;inset:0;width:16px;height:16px;border-radius:50%;border:2px solid var(--cyan);mix-blend-mode:screen}
.logo i:last-child{left:4px;border-color:var(--pink)}
.wordmark{font-weight:800;letter-spacing:-.03em;font-size:17px}
.tabs{display:flex;gap:16px;margin-inline:auto}
.tab{color:var(--muted);font-weight:700;font-size:15px;padding:2px 0;position:relative}
.tab.is-on{color:#fff}
.tab.is-on::after{content:"";position:absolute;left:50%;translate:-50% 0;bottom:-6px;width:22px;height:2.5px;border-radius:2px;background:#fff}
.icon-btn{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;color:#fff}
.icon-btn:hover{background:#ffffff1a}

/* ---------- views ---------- */
.view{flex:1;min-height:0;overflow-y:auto;-webkit-overflow-scrolling:touch}
.view[hidden]{display:none}

/* ---------- vertical feed ---------- */
.feed{scroll-snap-type:y mandatory;overscroll-behavior-y:contain;scrollbar-width:none}
.feed::-webkit-scrollbar{display:none}
.card{
  position:relative;height:100%;scroll-snap-align:start;scroll-snap-stop:always;
  overflow:hidden;background:#111;display:flex;flex-direction:column;justify-content:flex-end;
}
.card img.media{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.card::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(transparent 38%,rgba(0,0,0,.82) 100%);
}
.card-body{position:relative;z-index:2;padding:0 86px calc(var(--nav) + 18px) 16px}
.card-body h2{margin:0 0 6px;font-size:16px;font-weight:800;letter-spacing:-.01em}
.card-body h2 .verified{color:var(--cyan);font-size:13px}
.caption{margin:0 0 8px;font-size:14.5px;line-height:1.45;color:#fff;text-shadow:0 1px 10px #0009}
.caption .tag{color:var(--cyan);font-weight:700}
.sound{display:flex;align-items:center;gap:8px;font-size:13px;color:#fff;overflow:hidden}
.sound svg{width:15px;height:15px}
.ticker{white-space:nowrap;overflow:hidden;max-width:180px}
.ticker span{display:inline-block;animation:slide 11s linear infinite}
@keyframes slide{0%{transform:translateX(0)}100%{transform:translateX(-100%)}}

/* right action rail */
.rail{position:absolute;right:8px;bottom:calc(var(--nav) + 22px);z-index:3;display:flex;flex-direction:column;align-items:center;gap:18px}
.rail button{display:grid;justify-items:center;gap:4px;font-size:12px;font-weight:700;filter:drop-shadow(0 2px 6px #000a)}
.rail svg{width:30px;height:30px}
.rail .liked svg{fill:var(--pink);stroke:var(--pink);animation:pop .35s ease}
.rail .saved svg{fill:var(--cyan);stroke:var(--cyan);animation:pop .35s ease}
@keyframes pop{40%{transform:scale(1.35)}100%{transform:scale(1)}}
.rail .avatar{margin-bottom:4px}
.rail .follow{position:absolute;margin-top:34px;width:20px;height:20px;border-radius:50%;background:var(--pink);display:grid;place-items:center;font-size:14px;line-height:1;color:#fff}
.rail .follow.done{background:var(--cyan);color:#000}
.disc{width:40px;height:40px;border-radius:50%;background:conic-gradient(#333,#000,#333,#000);display:grid;place-items:center;animation:spin 5s linear infinite;border:1px solid #ffffff2e}
.disc span{font-size:16px}
@keyframes spin{to{transform:rotate(360deg)}}
.heart-burst{position:absolute;z-index:5;font-size:90px;pointer-events:none;translate:-50% -50%;animation:burst .8s ease forwards}
@keyframes burst{0%{opacity:0;scale:.3;rotate:-18deg}25%{opacity:1;scale:1.15}100%{opacity:0;scale:1.5;translate:-50% -130%}}

.avatar{
  width:44px;height:44px;border-radius:50%;display:grid;place-items:center;
  font-size:12px;font-weight:800;letter-spacing:.02em;color:#000;
  background:linear-gradient(135deg,var(--cyan),var(--pink));border:2px solid #000;
}
.avatar.sm{width:32px;height:32px;font-size:11px}
.avatar.xl{width:92px;height:92px;font-size:20px;border:3px solid #000;box-shadow:0 0 0 2px var(--cyan),0 0 36px rgba(0,242,234,.4)}

/* ---------- explore / profile grids ---------- */
.view-head{padding:72px 16px 10px}
.view-head h1{margin:0 0 12px;font-size:26px;letter-spacing:-.03em}
.search{display:flex;align-items:center;gap:8px;background:var(--surface-2);border:1px solid var(--line);border-radius:999px;padding:9px 14px}
.search svg{width:18px;height:18px;color:var(--muted)}
.search input{flex:1;background:none;border:0;outline:none;color:#fff;font-size:15px}
.chips{display:flex;gap:8px;overflow-x:auto;padding:12px 0 2px;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chip{white-space:nowrap;padding:7px 14px;border-radius:999px;background:var(--surface-2);border:1px solid var(--line);font-size:13px;font-weight:600;color:var(--muted)}
.chip.is-on{background:linear-gradient(135deg,var(--cyan),var(--pink));color:#000;border-color:transparent}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:3px;padding:6px 3px calc(var(--nav) + 20px)}
.cell{position:relative;aspect-ratio:9/14;overflow:hidden;background:#15151a;border-radius:6px}
.cell img{width:100%;height:100%;object-fit:cover;display:block}
.cell b{position:absolute;left:6px;bottom:5px;font-size:11.5px;display:flex;align-items:center;gap:4px;text-shadow:0 1px 6px #000}
.cell b svg{width:13px;height:13px;fill:#fff;stroke:none}
.empty{text-align:center;color:var(--muted);padding:30px 20px;font-size:14px}

/* ---------- activity ---------- */
.activity{list-style:none;margin:0;padding:0 14px calc(var(--nav) + 20px)}
.activity li{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.07)}
.activity p{margin:0;font-size:14px;line-height:1.35}
.activity p b{font-weight:700}
.activity time{display:block;font-size:12px;color:var(--muted);margin-top:2px}
.activity img{width:42px;height:54px;object-fit:cover;border-radius:5px;margin-left:auto}
.activity .btn{margin-left:auto}

/* ---------- profile ---------- */
.profile-top{text-align:center;padding:72px 20px 14px;display:grid;justify-items:center;gap:10px}
.profile-top h1{margin:0;font-size:18px;letter-spacing:-.02em}
.bio{margin:0;font-size:13.5px;color:var(--muted);line-height:1.5}
.stats{list-style:none;display:flex;gap:28px;margin:4px 0 2px;padding:0}
.stats li{display:grid;gap:2px}
.stats b{font-size:17px}
.stats span{font-size:12px;color:var(--muted)}
.profile-actions{display:flex;gap:10px}
.btn{border-radius:10px;padding:9px 18px;font-size:14px;font-weight:700}
.btn.primary{background:linear-gradient(135deg,var(--cyan),var(--pink));color:#000}
.btn.ghost{background:var(--surface-2);border:1px solid var(--line)}
.btn.wide{width:100%;padding:13px}
.profile-tabs{display:flex;border-bottom:1px solid var(--line);margin-top:8px}
.ptab{flex:1;padding:12px 0;font-size:14px;font-weight:700;color:var(--muted)}
.ptab.is-on{color:#fff;box-shadow:inset 0 -2px 0 #fff}

/* ---------- bottom nav ---------- */
.tabbar{
  position:absolute;bottom:0;left:0;right:0;z-index:25;height:var(--nav);
  display:flex;align-items:center;justify-content:space-around;
  background:rgba(0,0,0,.92);backdrop-filter:blur(14px);border-top:1px solid rgba(255,255,255,.08);
  padding-bottom:env(safe-area-inset-bottom);
}
.tb{position:relative;display:grid;justify-items:center;gap:3px;font-size:10.5px;font-weight:600;color:rgba(255,255,255,.55);width:60px}
.tb svg{width:23px;height:23px}
.tb.is-on{color:#fff}
.tb .dot{position:absolute;top:-2px;right:12px;width:8px;height:8px;border-radius:50%;background:var(--pink)}
.tb.create{width:52px;height:34px;border-radius:10px;background:linear-gradient(90deg,var(--cyan),var(--pink));color:#000;display:grid;place-items:center;box-shadow:0 0 22px rgba(255,45,85,.45)}
.tb.create .plus{font-size:24px;line-height:1;font-weight:400;margin-top:-2px}

/* ---------- sheets ---------- */
.sheet-wrap{position:fixed;inset:0;z-index:60;display:grid;place-items:end center}
.sheet-wrap[hidden]{display:none}
.scrim{position:absolute;inset:0;background:#000a;backdrop-filter:blur(2px)}
.sheet{
  position:relative;width:min(100vw,460px);max-height:76dvh;overflow-y:auto;
  background:var(--surface);border-radius:18px 18px 0 0;border-top:1px solid var(--line);
  animation:rise .22s ease;display:flex;flex-direction:column;
}
@media (min-width:520px) and (min-height:720px){
  .sheet-wrap{place-items:center}
  .sheet{border-radius:18px;max-height:min(80dvh,760px);border:1px solid var(--line)}
}
@keyframes rise{from{transform:translateY(24px);opacity:0}to{transform:none;opacity:1}}
.grab{width:38px;height:4px;border-radius:3px;background:#ffffff33;margin:9px auto 2px}
.sheet-head{display:flex;align-items:center;justify-content:space-between;padding:8px 14px;font-size:15px}
.comments{list-style:none;margin:0;padding:4px 14px 10px;display:grid;gap:14px}
.comments li{display:flex;gap:10px}
.comments p{margin:0;font-size:14px;line-height:1.4}
.comments .who{font-size:12.5px;color:var(--muted);margin-bottom:2px}
.comment-form{position:sticky;bottom:0;display:flex;gap:9px;align-items:center;padding:10px 14px calc(10px + env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--line)}
.comment-form input{flex:1;background:var(--surface-2);border:1px solid var(--line);border-radius:999px;padding:10px 14px;color:#fff;outline:none;font-size:14px}
.post-btn{font-weight:800;color:var(--cyan)}
.create-form{display:grid;gap:12px;padding:6px 14px calc(16px + env(safe-area-inset-bottom))}
.dropzone{position:relative;display:grid;place-items:center;aspect-ratio:9/12;max-height:300px;border:1.5px dashed var(--line);border-radius:14px;background:var(--surface-2);overflow:hidden;cursor:pointer;text-align:center}
.dropzone img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.dz-copy{display:grid;gap:4px;color:var(--muted);font-size:14px;z-index:1}
.dz-copy b{color:#fff}
.dropzone.has-img .dz-copy{display:none}
.samples{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none}
.samples::-webkit-scrollbar{display:none}
.samples img{width:52px;height:68px;object-fit:cover;border-radius:8px;cursor:pointer;opacity:.6;border:2px solid transparent}
.samples img.is-on{opacity:1;border-color:var(--cyan)}
.create-form>input{background:var(--surface-2);border:1px solid var(--line);border-radius:10px;padding:12px 14px;color:#fff;outline:none;font-size:14px}
.create-form>input:focus{border-color:var(--cyan)}

.toast{
  position:fixed;left:50%;bottom:98px;translate:-50% 12px;z-index:90;
  background:#fff;color:#000;font-size:13.5px;font-weight:700;padding:10px 16px;border-radius:999px;
  opacity:0;pointer-events:none;transition:.2s;
}
.toast.show{opacity:1;translate:-50% 0}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}