/* ==========================================================================
   Serkan Çağrı App, shared stylesheet
   GRKN Studios Management Ltd
   ========================================================================== */

:root{
  --ink:#0A0908;
  --ink-2:#100D0B;
  --panel:#15110D;
  --panel-2:#1C1712;
  --line:rgba(216,184,124,.16);
  --line-soft:rgba(255,255,255,.07);
  --gold:#D8B87C;
  --gold-lt:#F0DCAE;
  --gold-dim:rgba(216,184,124,.55);
  --text:#EFE7DA;
  --muted:#9A8F80;
  --maxw:1200px;
  --display:"Cormorant Garamond",Georgia,serif;
  --ui:"Jost","Helvetica Neue",Arial,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--ink);
  color:var(--text);
  font-family:var(--ui);
  font-weight:300;
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--gold);color:#0A0908}

:focus-visible{outline:1px solid var(--gold);outline-offset:3px}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}

/* ---------- shared type ---------- */
.eyebrow{
  font-size:.68rem;font-weight:400;letter-spacing:.38em;text-transform:uppercase;
  color:var(--gold-dim);
}
h1,h2,h3{font-family:var(--display);font-weight:300;line-height:1.05;letter-spacing:-.01em}
h2.section-title{font-size:clamp(2.1rem,4vw,3.3rem);margin:.35em 0 .5em}
h3{font-size:1.6rem}
p{color:var(--muted)}
.lead{font-size:1.06rem;max-width:56ch}

/* ---------- nav ---------- */
nav{
  position:fixed;inset:0 0 auto 0;z-index:50;
  height:74px;display:flex;align-items:center;
  background:rgba(10,9,8,.55);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:background .3s ease,border-color .3s ease;
}
nav.solid{background:rgba(10,9,8,.92);border-bottom-color:var(--line)}
.nav-inner{
  max-width:var(--maxw);width:100%;margin:0 auto;padding:0 32px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.brand{font-family:var(--display);font-size:1.55rem;font-style:italic;color:var(--text);white-space:nowrap}
.brand span{color:var(--gold)}
.nav-right{display:flex;align-items:center;gap:22px}
.nav-links{display:flex;gap:26px}
.nav-links a{
  font-size:.7rem;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);
  transition:color .2s;
}
.nav-links a:hover{color:var(--gold)}
.lang{display:flex;align-items:center;gap:2px;border:1px solid var(--line);border-radius:2px;padding:3px}
.lang button{
  background:none;border:0;cursor:pointer;color:var(--muted);font-family:var(--ui);
  font-size:.68rem;letter-spacing:.18em;padding:4px 9px;transition:.2s;
}
.lang button.active{background:var(--gold);color:#0A0908}

/* ---------- hero ---------- */
.hero{position:relative;min-height:100svh;display:flex;align-items:flex-end;overflow:hidden}
.hero-img{position:absolute;inset:0;background:url("hero.jpg") center/cover no-repeat;background-position:100% center}
.hero-scrim{
  position:absolute;inset:0;
  background:
    linear-gradient(0deg,rgba(10,9,8,.97) 3%,rgba(10,9,8,.6) 30%,rgba(10,9,8,.06) 58%,rgba(10,9,8,.4) 100%),
    linear-gradient(90deg,rgba(10,9,8,.66) 0%,rgba(10,9,8,.18) 40%,rgba(10,9,8,0) 62%);
}
.hero-inner{
  position:relative;z-index:2;max-width:var(--maxw);width:100%;margin:0 auto;
  padding:0 32px 92px;display:flex;justify-content:flex-start;
}
.hero-copy{max-width:560px;text-align:left;text-shadow:0 2px 40px rgba(0,0,0,.75),0 1px 4px rgba(0,0,0,.35)}
.hero-copy .eyebrow{display:block;margin-bottom:22px;color:rgba(240,220,174,.85)}
.hero h1{
  font-size:clamp(3.2rem,7vw,6rem);letter-spacing:-.02em;
  margin-bottom:18px;
}
.hero h1 em{font-style:italic;color:var(--gold-lt);display:block}
.hero .quote{
  font-family:var(--display);font-style:italic;font-size:1.3rem;line-height:1.5;
  color:rgba(239,231,218,.82);margin-bottom:34px;
}
.stores{display:flex;gap:14px;justify-content:flex-start;flex-wrap:wrap}

/* ---------- store buttons ---------- */
.store{
  display:inline-flex;align-items:center;gap:12px;
  padding:13px 24px;border:1px solid var(--line);border-radius:3px;
  background:rgba(20,16,12,.55);backdrop-filter:blur(6px);
  transition:border-color .25s,background .25s,transform .25s;
}
.store:hover{border-color:var(--gold);background:rgba(216,184,124,.08);transform:translateY(-2px)}
.store svg{width:20px;height:20px;fill:var(--gold);flex:none}
.store span{text-align:left}
.store b{display:block;font-family:var(--ui);font-weight:400;font-size:.9rem;letter-spacing:.06em;color:var(--text)}
.store small{display:block;font-size:.6rem;letter-spacing:.24em;text-transform:uppercase;color:var(--muted)}
.store.primary{background:linear-gradient(180deg,var(--gold-lt),var(--gold));border-color:transparent}
.store.primary b,.store.primary small{color:#100D0B}
.store.primary svg{fill:#100D0B}
.store.soon{opacity:.62;cursor:default;pointer-events:none}

/* ---------- section frame ---------- */
section{position:relative}
.band{padding:120px 0}
.band + .band{padding-top:0}
.rule{height:1px;background:linear-gradient(90deg,transparent,var(--line),transparent);margin:0 auto;max-width:var(--maxw)}

/* ---------- intro ---------- */
.intro{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:start}
.intro h2{margin-top:0}
.tabs-list{border-top:1px solid var(--line-soft)}
.tabs-list div{
  display:flex;justify-content:space-between;align-items:baseline;gap:20px;
  padding:16px 0;border-bottom:1px solid var(--line-soft);
}
.tabs-list dt{font-size:.72rem;letter-spacing:.24em;text-transform:uppercase;color:var(--text)}
.tabs-list dd{font-size:.9rem;color:var(--muted);text-align:right}

/* ---------- feature rows ---------- */
.feature{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:90px;align-items:center;padding:96px 0}
.feature + .feature{border-top:1px solid var(--line-soft)}
.feature.flip .feature-media{order:2}
.feature-copy .eyebrow{display:block;margin-bottom:16px}
.feature-copy h3{font-size:clamp(1.9rem,3vw,2.6rem);margin-bottom:16px}
.feature-copy p{max-width:44ch}
.bullets{margin-top:26px;display:flex;flex-wrap:wrap;gap:10px}
.bullets span{
  font-size:.66rem;letter-spacing:.2em;text-transform:uppercase;color:var(--gold-dim);
  border:1px solid var(--line);border-radius:2px;padding:7px 12px;
}
.feature-media{display:flex;justify-content:center}

/* ---------- device ---------- */
.device{
  width:290px;max-width:78vw;padding:9px;border-radius:46px;
  background:linear-gradient(155deg,#3a332b 0%,#151210 42%,#0b0908 100%);
  box-shadow:0 40px 90px rgba(0,0,0,.7),0 0 0 1px rgba(255,255,255,.05) inset;
  position:relative;
}
.device img{border-radius:38px;width:100%;height:auto}
.device.glow{box-shadow:0 40px 90px rgba(0,0,0,.7),0 0 90px rgba(216,184,124,.09),0 0 0 1px rgba(255,255,255,.05) inset}

/* ---------- clarinet corner (signature) ---------- */
.corner{
  background:
    radial-gradient(120% 90% at 15% 0%,rgba(216,184,124,.08),transparent 60%),
    var(--ink-2);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:120px 0;
}
.corner-head{max-width:640px;margin-bottom:56px}
.corner-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:34px;align-items:stretch}
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:34px;
  display:flex;flex-direction:column;
}
.card h4{
  font-family:var(--ui);font-weight:400;font-size:.7rem;letter-spacing:.28em;
  text-transform:uppercase;color:var(--gold);margin-bottom:6px;
}
.card .card-sub{font-size:.9rem;color:var(--muted);margin-bottom:28px}

/* meter selector */
.meters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:30px}
.meters button{
  font-family:var(--ui);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;
  background:none;border:1px solid var(--line);color:var(--muted);border-radius:2px;
  padding:9px 13px;cursor:pointer;transition:.2s;
}
.meters button:hover{color:var(--text)}
.meters button.active{background:var(--gold);border-color:var(--gold);color:#0A0908}

.meter-read{display:flex;align-items:baseline;gap:16px;margin-bottom:22px}
.meter-sig{font-family:var(--display);font-size:3.6rem;line-height:1;color:var(--text)}
.meter-split{font-size:.9rem;letter-spacing:.18em;color:var(--gold-dim)}

.pulse{display:flex;align-items:center;gap:14px;flex-wrap:wrap;min-height:44px;margin-bottom:26px}
.grp{display:flex;gap:9px;align-items:center}
.grp + .grp{padding-left:14px;border-left:1px solid var(--line-soft)}
.beat{
  width:12px;height:12px;border-radius:50%;
  background:rgba(239,231,218,.16);
  transition:transform .12s ease,background .12s ease,box-shadow .12s ease;
}
.beat.strong{width:16px;height:16px;background:rgba(216,184,124,.3)}
.beat.on{background:var(--gold-lt);transform:scale(1.55);box-shadow:0 0 18px rgba(216,184,124,.55)}
.beat.strong.on{transform:scale(1.7)}

.corner-controls{display:flex;align-items:center;gap:18px;margin-top:auto;flex-wrap:wrap}
.btn-ghost{
  font-family:var(--ui);font-size:.7rem;letter-spacing:.24em;text-transform:uppercase;
  background:linear-gradient(180deg,var(--gold-lt),var(--gold));color:#0A0908;
  border:0;border-radius:2px;padding:13px 26px;cursor:pointer;transition:filter .2s;
}
.btn-ghost:hover{filter:brightness(1.08)}
.tempo{display:flex;align-items:center;gap:12px;font-size:.8rem;color:var(--muted)}
.tempo input{width:130px;accent-color:var(--gold)}
.tempo b{font-family:var(--display);font-size:1.5rem;color:var(--text);font-weight:400;min-width:2.6ch}

/* tone card */
.tone-read{text-align:center;padding:10px 0;margin:auto 0}
.tone-note{font-family:var(--display);font-size:4.4rem;line-height:1;color:var(--text)}
.tone-hz{font-size:.72rem;letter-spacing:.28em;text-transform:uppercase;color:var(--gold-dim);margin-top:8px}
.hz-row{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin-top:16px}
.hz-row button{
  font-family:var(--ui);font-size:.72rem;letter-spacing:.1em;background:none;
  border:1px solid var(--line);color:var(--muted);border-radius:2px;padding:9px 12px;cursor:pointer;transition:.2s;
}
.hz-row button.active{background:rgba(216,184,124,.14);color:var(--gold-lt);border-color:var(--gold-dim)}
.note-small{font-size:.72rem;color:var(--muted);margin-top:18px;text-align:center}

/* ---------- download cta ---------- */
.cta{padding:130px 0;text-align:center}
.cta h2{font-size:clamp(2.4rem,5vw,4rem);margin-bottom:18px}
.cta p{margin:0 auto 40px;max-width:48ch}
.cta .stores{justify-content:center}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.contact-card{border:1px solid var(--line);border-radius:4px;padding:30px;background:var(--panel)}
.contact-card .eyebrow{display:block;margin-bottom:14px}
.contact-card a{color:var(--text);border-bottom:1px solid var(--line);transition:.2s}
.contact-card a:hover{color:var(--gold);border-color:var(--gold)}
.contact-card p{font-size:.92rem}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:44px 0;background:var(--ink-2)}
.foot-inner{
  max-width:var(--maxw);margin:0 auto;padding:0 32px;
  display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;
}
.foot-links{display:flex;gap:24px;flex-wrap:wrap}
.foot-links a,.foot-brand{font-size:.74rem;letter-spacing:.12em;color:var(--muted)}
.foot-links a:hover{color:var(--gold)}
.foot-brand a{color:var(--gold-dim)}

/* ---------- document pages ---------- */
.doc-wrap{max-width:820px;margin:0 auto;padding:150px 32px 90px}
.back{
  display:inline-block;font-size:.7rem;letter-spacing:.24em;text-transform:uppercase;
  color:var(--muted);margin-bottom:44px;transition:.2s;
}
.back:hover{color:var(--gold)}
.doc-head{border-bottom:1px solid var(--line);padding-bottom:30px;margin-bottom:44px}
.doc-head h1{font-size:clamp(2.4rem,5vw,3.6rem);margin:.25em 0 .3em}
.doc-head .meta{font-size:.76rem;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.doc-body h2{
  font-family:var(--ui);font-weight:400;font-size:.76rem;letter-spacing:.26em;text-transform:uppercase;
  color:var(--gold);margin:46px 0 14px;
}
.doc-body h3{font-family:var(--ui);font-weight:400;font-size:1rem;color:var(--text);margin:28px 0 8px}
.doc-body p{margin-bottom:14px;font-size:1rem}
.doc-body ul{margin:0 0 18px 20px}
.doc-body li{color:var(--muted);margin-bottom:8px;font-size:1rem}
.doc-body strong{color:var(--text);font-weight:400}
.doc-body a{color:var(--gold);border-bottom:1px solid var(--line)}
.callout{border:1px solid var(--line);border-left:2px solid var(--gold);background:var(--panel);padding:22px 26px;margin:26px 0;border-radius:0 4px 4px 0}
.callout p:last-child{margin-bottom:0}

/* faq */
.faq{border-top:1px solid var(--line-soft)}
.faq details{border-bottom:1px solid var(--line-soft);padding:20px 0}
.faq summary{cursor:pointer;list-style:none;font-size:1.02rem;color:var(--text);display:flex;justify-content:space-between;gap:20px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--gold);font-size:1.3rem;line-height:1}
.faq details[open] summary::after{content:"–"}
.faq details p{margin-top:12px;font-size:.96rem}

/* ---------- language sections ---------- */
.lang-section{display:none}
.lang-section.active{display:block}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .8s ease,transform .8s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media(max-width:1024px){
  .intro{grid-template-columns:1fr;gap:44px}
  .feature{grid-template-columns:1fr;gap:48px;padding:72px 0}
  .feature.flip .feature-media{order:0}
  .feature-copy{text-align:center;display:flex;flex-direction:column;align-items:center}
  .feature-copy p{max-width:52ch}
  .bullets{justify-content:center}
  .corner-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:760px){
  body{font-size:16px}
  .wrap{padding:0 20px}
  .nav-inner{padding:0 20px}
  .nav-links{display:none}
  .hero{min-height:92svh}
  .hero-img{background-position:24% center}
  .hero-scrim{background:linear-gradient(0deg,rgba(10,9,8,.97) 8%,rgba(10,9,8,.6) 46%,rgba(10,9,8,.32) 100%)}
  .hero-inner{padding:0 20px 60px}
  .hero-copy{max-width:100%}
  .store{flex:1 1 auto}
  .band{padding:84px 0}
  .cta{padding:90px 0}
  .card{padding:26px 22px}
  .doc-wrap{padding:120px 20px 70px}
  .foot-inner{flex-direction:column;text-align:center;padding:0 20px}
  .foot-links{justify-content:center}
}

@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}