/* YKS OS — tanıtım sitesi. Momentum marka teması. */
:root{
  --purple:#6425FF; --purple-lite:#7A3BFF; --purple-deep:#17103A;
  --lime:#B6FF3D; --coral:#FF5C39;
  --bg:#FBF8FF; --surface:#FFFFFF; --surface-alt:#F4EFFF;
  --ink:#17103A; --ink-soft:#4B4370; --muted:#8B83A8;
  --line:#EFE9FF;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,monospace;
  --wrap:1080px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;line-height:1.5}
a{color:var(--purple);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}

/* --- top bar --- */
.topbar{position:sticky;top:0;z-index:50;background:rgba(251,248,255,.82);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line)}
.topbar .row{max-width:var(--wrap);margin:0 auto;padding:16px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:19px;letter-spacing:-0.02em;color:var(--ink)}
.brand:hover{text-decoration:none}
.logo{width:36px;height:36px;border-radius:11px;background:linear-gradient(150deg,#6425FF,#17103A);
  display:grid;place-items:center;color:#fff;font-weight:800;font-size:15px;box-shadow:0 6px 16px -6px rgba(100,37,255,.6)}
.topbar nav{display:flex;gap:26px;align-items:center;font-size:15px;font-weight:600}
.topbar nav a{color:var(--ink-soft)}
.btn{display:inline-block;background:linear-gradient(180deg,#7A3BFF,#5A1EEB);color:#fff!important;
  font-weight:700;padding:12px 22px;border-radius:14px;box-shadow:0 12px 24px -12px rgba(100,37,255,.7)}
.btn:hover{text-decoration:none;filter:brightness(1.05)}
.btn.ghost{background:var(--surface-alt);color:var(--purple)!important;box-shadow:none}
@media(max-width:640px){.topbar nav a:not(.btn){display:none}}

/* --- hero --- */
.hero{position:relative;overflow:hidden;background:linear-gradient(168deg,#6C2EFF 0%,#3B1E8F 48%,#17103A 100%);color:#fff}
.hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(52% 30% at 82% 8%,rgba(182,255,61,.28),transparent 60%),
             radial-gradient(60% 40% at 6% 0%,rgba(122,59,255,.55),transparent 60%)}
.hero .wrap{position:relative;max-width:var(--wrap);margin:0 auto;padding:92px 24px 108px;text-align:center}
.kicker{display:inline-block;font-size:13px;font-weight:800;letter-spacing:.28em;text-transform:uppercase;color:var(--lime);margin-bottom:22px}
.hero h1{font-size:clamp(38px,6.4vw,72px);line-height:1.03;font-weight:800;letter-spacing:-0.035em;text-wrap:balance}
.hero h1 em{color:var(--lime);font-style:normal}
.hero p{max-width:640px;margin:26px auto 0;font-size:clamp(16px,2.3vw,20px);color:rgba(255,255,255,.82);font-weight:500}
.hero .cta{margin-top:40px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero .btn.ghost{background:rgba(255,255,255,.12);color:#fff!important}

/* --- sections --- */
section.pad{max-width:var(--wrap);margin:0 auto;padding:88px 24px}
.eyebrow{font-size:13px;font-weight:800;letter-spacing:.2em;text-transform:uppercase;color:var(--purple);text-align:center}
h2.sec{font-size:clamp(28px,4vw,40px);font-weight:800;letter-spacing:-0.03em;text-align:center;margin:14px auto 0;text-wrap:balance;max-width:720px}
.sub{text-align:center;color:var(--ink-soft);max-width:620px;margin:16px auto 0;font-size:17px}

.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px;margin-top:52px}
.feat{background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:32px;
  box-shadow:0 24px 48px -34px rgba(100,37,255,.4)}
.feat .ic{width:56px;height:56px;border-radius:16px;background:rgba(100,37,255,.10);display:grid;place-items:center;font-size:28px;margin-bottom:20px}
.feat h3{font-size:20px;font-weight:800;letter-spacing:-0.01em}
.feat p{margin-top:10px;color:var(--ink-soft);font-size:15px}

/* --- steps --- */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:22px;margin-top:52px;counter-reset:step}
.step{position:relative;padding:30px;border-radius:24px;background:var(--surface-alt)}
.step .n{font-family:var(--mono);font-size:14px;font-weight:800;color:var(--purple);letter-spacing:.1em}
.step h3{margin-top:12px;font-size:19px;font-weight:800}
.step p{margin-top:8px;color:var(--ink-soft);font-size:15px}

/* --- CTA band --- */
.band{background:linear-gradient(150deg,#6425FF,#17103A);color:#fff;border-radius:32px;
  max-width:var(--wrap);margin:0 auto;padding:64px 32px;text-align:center;position:relative;overflow:hidden}
.band::before{content:"";position:absolute;inset:0;background:radial-gradient(50% 60% at 85% 10%,rgba(182,255,61,.25),transparent 60%)}
.band h2{position:relative;font-size:clamp(26px,4vw,38px);font-weight:800;letter-spacing:-0.03em}
.band p{position:relative;color:rgba(255,255,255,.82);margin-top:14px;font-size:17px}
.band .cta{position:relative;margin-top:32px}

/* --- footer --- */
footer{border-top:1px solid var(--line);margin-top:96px}
footer .row{max-width:var(--wrap);margin:0 auto;padding:40px 24px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;
  color:var(--muted);font-size:14px}
footer nav{display:flex;gap:22px;flex-wrap:wrap}
footer nav a{color:var(--ink-soft);font-weight:600}

/* --- legal / doc pages --- */
.doc{max-width:820px;margin:0 auto;padding:64px 24px 40px}
.doc .back{font-size:14px;font-weight:700;color:var(--purple)}
.doc h1{font-size:clamp(30px,5vw,44px);font-weight:800;letter-spacing:-0.03em;margin-top:24px}
.doc .updated{color:var(--muted);font-size:14px;margin-top:10px;font-family:var(--mono)}
.doc h2{font-size:22px;font-weight:800;letter-spacing:-0.01em;margin-top:40px}
.doc p,.doc li{color:var(--ink-soft);font-size:16px;margin-top:14px;line-height:1.7}
.doc ul{margin-top:8px;padding-left:22px}
.doc li{margin-top:8px}
.doc strong{color:var(--ink)}
.doc a{font-weight:600}
.callout{background:var(--surface-alt);border-radius:18px;padding:20px 24px;margin-top:22px}
.callout p{margin-top:0}