/* ============================================================
   KChel Player · landing page
   ============================================================ */
:root{
  --bg:#000;
  --panel:#0B0B0D;
  --card:#121214;
  --line:rgba(255,255,255,.10);
  --tx:#F5F5F7;
  --tx2:#9B9BA3;
  --green:#0EA053;
  --accent:#13BC62;
  --blue:#0076D3;
  --gold:#F0C630;
  --r:18px;
  --logo-gap:#000;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--tx);
  font:15px/1.55 -apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Inter,system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
.ic{width:20px;height:20px;display:block;fill:none}
svg.ic use{pointer-events:none}

/* ---------------------------------------------------- buttons */
.btn{
  border:0;border-radius:999px;padding:11px 20px;font:inherit;font-weight:600;
  cursor:pointer;transition:transform .12s ease,background .15s ease,opacity .15s;
  white-space:nowrap;
}
.btn:active{transform:scale(.96)}
.btn.solid{background:var(--accent);color:#04170C}
.btn.solid:hover{background:#17d872}
.btn.ghost{background:rgba(255,255,255,.08);color:var(--tx);border:1px solid var(--line)}
.btn.ghost:hover{background:rgba(255,255,255,.14)}
.btn.lg{padding:14px 26px;font-size:16px}
.btn.sm{padding:9px 16px;font-size:14px}
.btn.full{width:100%;padding:14px;font-size:16px;margin-top:4px}
.btn[disabled]{opacity:.55;cursor:default}

/* ---------------------------------------------------- nav */
.brand-mark{width:30px;height:30px;flex:none}
.brand-mark.lg{width:44px;height:44px}
.brand-mark.sm{width:22px;height:22px}
.nav{
  position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:22px;
  padding:14px clamp(16px,4vw,48px);
  background:rgba(0,0,0,.62);backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;font-size:17px;letter-spacing:-.01em}
.brand b{font-weight:700}
.nav-links{display:flex;gap:20px;margin-left:14px;color:var(--tx2);font-size:14px;font-weight:500}
.nav-links a:hover{color:var(--tx)}
.nav-cta{margin-left:auto;display:flex;gap:10px;align-items:center}
@media(max-width:640px){ .nav-links{display:none} .nav{gap:12px;padding:12px 16px} }

/* ---------------------------------------------------- hero */
.hero{
  position:relative;overflow:hidden;
  padding:clamp(48px,7vw,96px) clamp(16px,4vw,48px) clamp(56px,7vw,110px);
}
.hero-inner{
  position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;
  align-items:center;max-width:1240px;margin:0 auto;
}
.glow{position:absolute;border-radius:50%;filter:blur(110px);opacity:.30;pointer-events:none;z-index:0}
.g1{width:620px;height:620px;background:var(--green);top:-220px;left:-200px}
.g2{width:560px;height:560px;background:var(--blue);bottom:-260px;right:-180px;opacity:.24}
.g3{width:300px;height:300px;background:var(--gold);top:40%;left:44%;opacity:.10}
.hero-copy,.hero-art{position:relative;z-index:1}
.eyebrow{
  display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:600;letter-spacing:.01em;
  color:#9df3c2;background:rgba(19,188,98,.12);border:1px solid rgba(19,188,98,.28);
  padding:6px 13px;border-radius:999px;margin-bottom:22px;
}
.eyebrow .ic{width:14px;height:14px;fill:currentColor}
h1{
  margin:0 0 18px;font-size:clamp(40px,6.2vw,68px);line-height:1.03;letter-spacing:-.035em;font-weight:700;
}
.grad{background:linear-gradient(100deg,var(--accent),var(--blue) 55%,var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent}
.sub{margin:0 0 30px;font-size:clamp(15px,1.35vw,18px);color:var(--tx2);max-width:52ch;line-height:1.6}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
.trust{margin-top:26px;font-size:13px;color:#6E6E76}
.trust b{color:var(--tx2)}
@media(max-width:900px){
  .hero-inner{grid-template-columns:1fr;gap:44px;text-align:center}
  .sub{margin-inline:auto}
  .hero-btns{justify-content:center}
}

/* ---------------------------------------------------- hero mock */
.mock{
  position:relative;background:linear-gradient(170deg,#17171B,#0A0A0C);
  border:1px solid var(--line);border-radius:26px;padding:16px;
  box-shadow:0 40px 90px -30px rgba(0,0,0,.9),0 0 0 1px rgba(255,255,255,.03) inset;
  transform:perspective(1400px) rotateY(-9deg) rotateX(4deg);
  transition:transform .5s cubic-bezier(.2,.8,.2,1);
}
.mock:hover{transform:perspective(1400px) rotateY(-4deg) rotateX(2deg) translateY(-4px)}
@media(max-width:900px){ .mock{transform:none} .mock:hover{transform:translateY(-3px)} }
.mock-top{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.mock-dots{display:flex;gap:6px}
.mock-dots i{width:9px;height:9px;border-radius:50%;background:#2A2A30}
.mock-search{flex:1;background:#18181D;border:1px solid var(--line);border-radius:999px;padding:7px 14px;font-size:12px;color:#5E5E68}
.mock-hello{font-size:20px;font-weight:700;letter-spacing:-.02em;margin:2px 2px 14px;text-align:left}
.mock-hello b{color:var(--accent)}
.mock-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.tile{display:flex;align-items:center;gap:10px;background:#171719;border-radius:12px;padding:8px;overflow:hidden}
.tile span{width:40px;height:40px;border-radius:8px;flex:none}
.tile em{font-style:normal;font-size:12px;font-weight:600;color:#C9C9D1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.t1 span{background:linear-gradient(135deg,#0EA053,#0b6b39)}
.t2 span{background:linear-gradient(135deg,#0076D3,#123f7a)}
.t3 span{background:linear-gradient(135deg,#F0C630,#a3761a)}
.t4 span{background:linear-gradient(135deg,#7B4DFF,#3a2380)}
.mock-bar{display:flex;align-items:center;gap:11px;margin-top:14px;padding-top:13px;border-top:1px solid var(--line)}
.mb-art{width:40px;height:40px;border-radius:8px;background:#202026;display:grid;place-items:center;color:#55555E;flex:none}
.mb-meta{flex:1;min-width:0;text-align:left}
.mb-meta b{display:block;font-size:12.5px}
.mb-meta em{font-style:normal;font-size:11px;color:var(--tx2)}
.mb-ctrl{display:flex;align-items:center;gap:9px;color:#C9C9D1}
.mb-ctrl .ic{width:16px;height:16px}
.mb-play{width:30px;height:30px;border-radius:50%;background:#fff;color:#000;display:grid;place-items:center}
.mb-play .ic{width:13px;height:13px}
.eq{position:absolute;right:20px;bottom:-14px;display:flex;align-items:flex-end;gap:3px;height:28px;opacity:.9}
.eq i{width:3px;background:var(--accent);border-radius:2px;animation:bounce 1.1s ease-in-out infinite}
.eq i:nth-child(1){height:40%;animation-delay:0s}
.eq i:nth-child(2){height:75%;animation-delay:.12s}
.eq i:nth-child(3){height:55%;animation-delay:.24s}
.eq i:nth-child(4){height:95%;animation-delay:.36s}
.eq i:nth-child(5){height:45%;animation-delay:.48s}
.eq i:nth-child(6){height:80%;animation-delay:.6s}
.eq i:nth-child(7){height:35%;animation-delay:.72s}
@keyframes bounce{0%,100%{transform:scaleY(.35)}50%{transform:scaleY(1)}}
@media(prefers-reduced-motion:reduce){.eq i{animation:none}}

/* ---------------------------------------------------- sections */
section h2{
  margin:0 0 34px;text-align:center;font-size:clamp(24px,3vw,34px);
  letter-spacing:-.028em;font-weight:700;
}
.feats,.apps{padding:clamp(52px,7vw,86px) clamp(16px,4vw,48px);max-width:1160px;margin:0 auto}
.feats{border-top:1px solid var(--line)}
.feat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px}
.feat{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px 22px;transition:border-color .2s,transform .2s}
.feat:hover{border-color:rgba(19,188,98,.42);transform:translateY(-3px)}
.fi{width:40px;height:40px;border-radius:11px;background:rgba(19,188,98,.13);color:var(--accent);display:grid;place-items:center;margin-bottom:15px}
.feat b{display:block;font-size:16.5px;letter-spacing:-.015em;margin-bottom:7px}
.feat p{margin:0;color:var(--tx2);font-size:14px;line-height:1.55}

.apps{border-top:1px solid var(--line)}
.app-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px}
.app{background:linear-gradient(180deg,#141417,#0D0D0F);border:1px solid var(--line);border-radius:var(--r);padding:26px 22px;text-align:center}
.ai{width:46px;height:46px;border-radius:13px;background:rgba(255,255,255,.06);display:grid;place-items:center;margin:0 auto 14px;color:var(--tx)}
.ai .ic{width:23px;height:23px;stroke:currentColor}
.app b{display:block;font-size:17px;margin-bottom:7px}
.app p{margin:0 0 16px;color:var(--tx2);font-size:14px;min-height:42px}
.soon{display:inline-block;font-size:13px;color:#6E6E76;padding:9px 16px;border:1px dashed var(--line);border-radius:999px}

.foot{
  display:flex;align-items:center;justify-content:center;gap:10px;
  padding:30px 16px 46px;color:#5E5E68;font-size:13px;border-top:1px solid var(--line);
}

/* ---------------------------------------------------- auth sheet */
[hidden]{display:none!important}
.sheet{
  position:fixed;inset:0;z-index:90;display:grid;place-items:center;padding:18px;
  background:rgba(0,0,0,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  animation:fade .18s ease;
}
@keyframes fade{from{opacity:0}to{opacity:1}}
.sheet-card{
  position:relative;width:100%;max-width:404px;background:#121214;border:1px solid var(--line);
  border-radius:24px;padding:32px 28px 24px;text-align:center;
  box-shadow:0 40px 90px -24px rgba(0,0,0,.95);
  animation:pop .22s cubic-bezier(.2,.9,.3,1.2);max-height:94vh;overflow:auto;
}
@keyframes pop{from{opacity:0;transform:translateY(14px) scale(.97)}to{opacity:1;transform:none}}
.sheet-card .brand-mark{margin:0 auto 14px}
.sheet-card h3{margin:0 0 6px;font-size:23px;letter-spacing:-.025em}
.sheet-sub{margin:0 0 22px;color:var(--tx2);font-size:14px}
.sheet-x{
  position:absolute;top:14px;right:14px;width:32px;height:32px;border-radius:50%;border:0;
  background:rgba(255,255,255,.07);color:var(--tx2);display:grid;place-items:center;cursor:pointer;
}
.sheet-x:hover{background:rgba(255,255,255,.14);color:var(--tx)}
.field{display:block;text-align:left;margin-bottom:13px}
.field span{display:block;font-size:12.5px;font-weight:600;color:var(--tx2);margin-bottom:6px}
.field input{
  width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--line);
  background:#1A1A1E;color:var(--tx);font:inherit;font-size:15px;outline:none;
  transition:border-color .15s,box-shadow .15s;
}
.field input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(19,188,98,.16)}
.field input::placeholder{color:#55555E}
.err{
  background:rgba(255,69,58,.12);border:1px solid rgba(255,69,58,.32);color:#FF9A93;
  border-radius:11px;padding:10px 13px;font-size:13.5px;text-align:left;margin:4px 0 12px;
}
.swap{margin-top:16px;font-size:14px;color:var(--tx2)}
.swap button{background:none;border:0;color:var(--accent);font:inherit;font-weight:600;cursor:pointer;padding:0}
.swap button:hover{text-decoration:underline}
.fine{margin:18px 0 0;font-size:11.5px;color:#5A5A63;line-height:1.5}

/* ---------------------------------------------------- real covers in the mock */
.tile span{position:relative;overflow:hidden}
.tile span img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;animation:fadein .4s ease}
.mb-art{overflow:hidden}
.mb-art img{width:100%;height:100%;object-fit:cover;animation:fadein .4s ease}
.mb-meta b{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mb-meta em{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
@keyframes fadein{from{opacity:0}to{opacity:1}}

/* ---------------------------------------------------- the cover wall */
.wall{border-top:1px solid var(--line);padding:clamp(48px,6vw,74px) 0 clamp(52px,6vw,78px);overflow:hidden}
.wall-head{text-align:center;padding:0 20px;margin-bottom:30px}
.wall-head h2{margin:0 0 8px}
.wall-head p{margin:0;color:var(--tx2);font-size:14.5px}
.wall-rows{display:flex;flex-direction:column;gap:14px;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 9%,#000 91%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 9%,#000 91%,transparent)}
.wall-row{display:flex;gap:14px;width:max-content;animation:drift 64s linear infinite}
.wall-row.rev{animation-direction:reverse;animation-duration:78s}
.wall-row:hover{animation-play-state:paused}
.cov{width:132px;height:132px;flex:none;border-radius:14px;overflow:hidden;background:#161619;
  box-shadow:0 12px 28px -14px rgba(0,0,0,.9);border:1px solid rgba(255,255,255,.06)}
.cov img{width:100%;height:100%;object-fit:cover;display:block;animation:fadein .5s ease}
@keyframes drift{from{transform:translateX(0)}to{transform:translateX(-50%)}}
@media(max-width:640px){ .cov{width:104px;height:104px;border-radius:12px} .wall-row{gap:10px} }
@media(prefers-reduced-motion:reduce){ .wall-row{animation:none} }

/* ---------------------------------------------------- Google button + divider */
.btn.oauth{
  display:flex;align-items:center;justify-content:center;gap:10px;width:100%;
  background:#fff;color:#1F1F1F;padding:12px;font-size:15px;font-weight:600;
  border-radius:12px;text-decoration:none;
}
.btn.oauth:hover{background:#EDEDED}
.gmark{width:20px;height:20px;flex:none;display:block}
.gmark.letter{
  display:grid;place-items:center;border-radius:50%;background:#1F1F1F;color:#fff;
  font-weight:700;font-size:12px;line-height:1;
}
.or{display:flex;align-items:center;gap:12px;color:#5E5E68;font-size:12.5px;margin:16px 0 4px}
.or::before,.or::after{content:"";flex:1;height:1px;background:var(--line)}

/* ---------------------------------------------------- code boxes */
.sent{display:flex;align-items:center;justify-content:center;gap:7px;margin:0 0 16px;font-size:13.5px;color:var(--tx2)}
.sent .ic{width:16px;height:16px;stroke:currentColor;color:var(--accent)}
.sent b{color:var(--tx);font-weight:600;overflow:hidden;text-overflow:ellipsis;max-width:200px;white-space:nowrap}
.code{display:flex;gap:8px;justify-content:center;margin-bottom:14px}
.code input{
  width:46px;height:56px;text-align:center;font-size:22px;font-weight:700;
  border-radius:12px;border:1px solid var(--line);background:#1A1A1E;color:var(--tx);
  outline:none;transition:border-color .15s,box-shadow .15s;
}
.code input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(19,188,98,.16)}
@media(max-width:380px){ .code{gap:6px} .code input{width:40px;height:50px;font-size:19px} }
.swap button:disabled{opacity:.5;cursor:default}

/* ---------------------------------------------------- download button */
.btn.dl{display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none}
.btn.dl .ic{width:17px;height:17px;stroke:currentColor}