/* ==========================================================================
   etrn.com.tr — Smarthost & ETRN Hizmeti | C2B Bilişim Hizmetleri
   Ortak stil dosyası
   ========================================================================== */

:root{
  --navy-950:#070c17;
  --navy-900:#0b1220;
  --navy-800:#111c30;
  --navy-700:#182741;
  --navy-600:#22335490;
  --cyan-400:#22d3ee;
  --cyan-500:#06b6d4;
  --cyan-300:#67e8f9;
  --ink-900:#0b1220;
  --ink-700:#334155;
  --ink-500:#64748b;
  --ink-300:#cbd5e1;
  --paper-0:#ffffff;
  --paper-50:#f7fafc;
  --paper-100:#eef2f7;
  --border-200:#e2e8f0;
  --success-600:#16a34a;
  --radius-lg:18px;
  --radius-md:12px;
  --radius-sm:8px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --shadow-md:0 8px 24px rgba(15,23,42,.08);
  --shadow-lg:0 18px 48px rgba(15,23,42,.14);
  --maxw:1160px;
  --font-sans:'Inter',-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-sans);
  color:var(--ink-900);
  background:var(--paper-0);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
button{font:inherit;cursor:pointer;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}

/* ---------- Typography ---------- */
h1{font-size:clamp(2rem,1.4rem + 2.4vw,3.2rem);line-height:1.12;font-weight:800;letter-spacing:-0.02em;}
h2{font-size:clamp(1.5rem,1.2rem + 1.2vw,2.2rem);line-height:1.2;font-weight:800;letter-spacing:-0.01em;}
h3{font-size:1.2rem;font-weight:700;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.8rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  color:var(--cyan-500);
  background:rgba(6,182,212,.1);
  border:1px solid rgba(6,182,212,.25);
  padding:6px 14px;border-radius:999px;
}
.lede{font-size:1.15rem;color:var(--ink-700);}
.muted{color:var(--ink-500);}
.section-head{max-width:720px;margin:0 auto 44px;text-align:center;display:flex;flex-direction:column;gap:14px;align-items:center;}
.section-head.left{margin:0 0 40px;text-align:left;align-items:flex-start;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 26px;border-radius:999px;font-weight:700;font-size:.98rem;
  border:1px solid transparent;transition:transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--cyan-500);color:#04202a;box-shadow:0 10px 24px rgba(6,182,212,.35);}
.btn-primary:hover{background:var(--cyan-400);box-shadow:0 12px 30px rgba(6,182,212,.45);}
.btn-ghost{background:transparent;color:var(--paper-0);border-color:rgba(255,255,255,.28);}
.btn-ghost:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.5);}
.btn-dark{background:var(--navy-900);color:var(--paper-0);}
.btn-dark:hover{background:var(--navy-800);}
.btn-outline{background:transparent;color:var(--navy-900);border-color:var(--border-200);}
.btn-outline:hover{border-color:var(--navy-900);}
.btn-whatsapp{background:#25D366;color:#04240f;}
.btn-whatsapp:hover{background:#2fe374;}
.btn-block{width:100%;}
.btn-lg{padding:16px 32px;font-size:1.02rem;}
.btn svg{width:18px;height:18px;flex:none;}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(7,12,23,.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 24px;}
.brand{display:flex;align-items:center;gap:12px;color:var(--paper-0);}
.brand-mark{
  width:42px;height:42px;border-radius:12px;flex:none;
  background:linear-gradient(135deg,var(--cyan-400),#0891b2);
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 6px 18px rgba(6,182,212,.4);
}
.brand-mark svg{width:24px;height:24px;}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-text strong{font-size:1.18rem;font-weight:800;letter-spacing:-0.01em;}
.brand-text span{font-size:.72rem;color:var(--ink-300);font-weight:600;letter-spacing:.02em;}

.main-nav{display:flex;align-items:center;gap:6px;}
.main-nav a{
  color:var(--ink-300);font-weight:600;font-size:.95rem;
  padding:10px 14px;border-radius:999px;transition:background .15s, color .15s;
}
.main-nav a:hover,.main-nav a[aria-current="page"]{color:var(--paper-0);background:rgba(255,255,255,.08);}
.header-cta{display:flex;align-items:center;gap:10px;}
.header-phone{
  display:flex;align-items:center;gap:8px;color:var(--paper-0);font-weight:700;font-size:.92rem;
}
.header-phone svg{width:18px;height:18px;color:var(--cyan-400);}
.nav-toggle{
  display:none;background:transparent;border:1px solid rgba(255,255,255,.25);
  border-radius:10px;padding:9px 10px;color:var(--paper-0);
}
.nav-toggle svg{width:22px;height:22px;}

@media (max-width:940px){
  .main-nav{
    position:fixed;top:64px;left:0;right:0;bottom:auto;
    height:calc(100vh - 64px);height:calc(100dvh - 64px);
    background:var(--navy-950);z-index:99;
    flex-direction:column;align-items:stretch;gap:2px;padding:18px;
    transform:translateY(-8px);opacity:0;visibility:hidden;transition:all .2s ease;
    overflow-y:auto;
  }
  .main-nav.is-open{transform:translateY(0);opacity:1;visibility:visible;}
  .main-nav a{padding:16px 14px;font-size:1.05rem;border-bottom:1px solid rgba(255,255,255,.06);}
  .header-phone span{display:none;}
  .nav-toggle{display:inline-flex;align-items:center;justify-content:center;}
}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;color:var(--paper-0);
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(6,182,212,.35), transparent 60%),
    radial-gradient(700px 400px at 10% 110%, rgba(34,211,238,.18), transparent 60%),
    linear-gradient(180deg,var(--navy-950),var(--navy-900) 60%,var(--navy-900));
  padding:76px 0 90px;
}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center;}
.hero-content{display:flex;flex-direction:column;gap:22px;align-items:flex-start;}
.hero p.lede{color:var(--ink-300);}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:6px;}
.hero-trust{display:flex;flex-wrap:wrap;gap:22px;margin-top:18px;color:var(--ink-300);font-size:.88rem;}
.hero-trust li{display:flex;align-items:center;gap:8px;}
.hero-trust svg{width:16px;height:16px;color:var(--cyan-400);flex:none;}

.hero-panel{
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.12);
  border-radius:var(--radius-lg);
  padding:26px;backdrop-filter:blur(6px);
  box-shadow:var(--shadow-lg);
}
.hero-panel-row{display:flex;justify-content:space-between;align-items:center;padding:14px 0;border-bottom:1px dashed rgba(255,255,255,.14);}
.hero-panel-row:last-child{border-bottom:none;}
.hero-panel-row .label{color:var(--ink-300);font-size:.88rem;}
.hero-panel-row .value{color:var(--paper-0);font-weight:800;font-size:1.15rem;}
.hero-panel-row .value.good{color:#4ade80;}

/* ---------- Sections ---------- */
section{padding:88px 0;}
.section-alt{background:var(--paper-50);}
.section-dark{background:var(--navy-950);color:var(--paper-0);}
.section-dark .muted{color:var(--ink-300);}

.grid{display:grid;gap:26px;}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-2{grid-template-columns:repeat(2,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
@media (max-width:940px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr);}}
@media (max-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}}

.card{
  background:var(--paper-0);border:1px solid var(--border-200);border-radius:var(--radius-lg);
  padding:30px;box-shadow:var(--shadow-sm);transition:box-shadow .2s ease, transform .2s ease;
}
.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);}
.card-icon{
  width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  background:rgba(6,182,212,.12);color:var(--cyan-500);margin-bottom:18px;
}
.card-icon svg{width:26px;height:26px;}
.card h3{margin-bottom:10px;}
.card p{color:var(--ink-700);font-size:.98rem;}

.steps{counter-reset:step;display:flex;flex-direction:column;gap:0;}
.step{display:grid;grid-template-columns:56px 1fr;gap:22px;padding:26px 0;border-bottom:1px solid var(--border-200);}
.step:last-child{border-bottom:none;}
.step-num{
  counter-increment:step;width:48px;height:48px;border-radius:50%;
  background:var(--navy-900);color:var(--paper-0);display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:1.05rem;
}
.step-num::before{content:counter(step);}
.step h3{margin-bottom:6px;}
.step p{color:var(--ink-700);}

.check-list{display:flex;flex-direction:column;gap:14px;}
.check-list li{display:flex;align-items:flex-start;gap:12px;color:var(--ink-700);}
.check-list svg{width:20px;height:20px;color:var(--success-600);flex:none;margin-top:2px;}

.badge-row{display:flex;flex-wrap:wrap;gap:10px;}
.pill{
  display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:999px;
  background:var(--paper-100);border:1px solid var(--border-200);font-size:.85rem;font-weight:600;color:var(--ink-700);
}

/* ---------- Pricing ---------- */
.plan-card{
  display:flex;flex-direction:column;gap:18px;
  background:var(--paper-0);border:1px solid var(--border-200);border-radius:var(--radius-lg);
  padding:34px;position:relative;
}
.plan-card.featured{border-color:var(--cyan-500);box-shadow:0 20px 44px rgba(6,182,212,.18);}
.plan-badge{
  position:absolute;top:-14px;left:34px;background:var(--cyan-500);color:#04202a;
  font-size:.75rem;font-weight:800;padding:6px 14px;border-radius:999px;letter-spacing:.02em;
}
.plan-name{font-size:1.05rem;font-weight:800;color:var(--ink-500);text-transform:uppercase;letter-spacing:.04em;}
.plan-for{color:var(--ink-500);font-size:.92rem;}
.plan-cta-note{font-size:.8rem;color:var(--ink-500);text-align:center;}

.compare-table{width:100%;border-collapse:collapse;background:var(--paper-0);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);}
.compare-table caption{text-align:left;padding:16px 20px;font-weight:700;background:var(--paper-100);}
.compare-table th,.compare-table td{padding:14px 18px;border-bottom:1px solid var(--border-200);text-align:left;font-size:.94rem;}
.compare-table th{background:var(--paper-50);color:var(--ink-700);}
.compare-table td.center,.compare-table th.center{text-align:center;}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;}

/* ---------- Forms ---------- */
.form-card{
  background:var(--paper-0);border:1px solid var(--border-200);border-radius:var(--radius-lg);
  padding:34px;box-shadow:var(--shadow-md);
}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
@media (max-width:640px){.form-grid{grid-template-columns:1fr;}}
.field{display:flex;flex-direction:column;gap:8px;}
.field.full{grid-column:1 / -1;}
.field label{font-weight:700;font-size:.9rem;color:var(--ink-900);}
.field .req{color:#ef4444;}
.field input,.field select,.field textarea{
  border:1.5px solid var(--border-200);border-radius:var(--radius-sm);padding:12px 14px;
  font:inherit;font-size:.96rem;color:var(--ink-900);background:var(--paper-0);
  transition:border-color .15s ease, box-shadow .15s ease;
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--cyan-500);box-shadow:0 0 0 4px rgba(6,182,212,.15);
}
.field textarea{resize:vertical;min-height:110px;}
.form-note{font-size:.82rem;color:var(--ink-500);}
.form-success{
  display:none;background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46;
  padding:16px 18px;border-radius:var(--radius-md);font-weight:600;font-size:.92rem;
}
.form-success.is-visible{display:block;}

/* ---------- FAQ ---------- */
.faq-item{border-bottom:1px solid var(--border-200);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  background:transparent;border:none;padding:22px 4px;text-align:left;font-weight:700;font-size:1.02rem;color:var(--ink-900);
}
.faq-q svg{width:20px;height:20px;flex:none;color:var(--ink-500);transition:transform .2s ease;}
.faq-item.is-open .faq-q svg{transform:rotate(180deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;}
.faq-a p{padding:0 4px 22px;color:var(--ink-700);}
.faq-item.is-open .faq-a{max-height:600px;}

/* ---------- CTA band ---------- */
.cta-band{
  background:linear-gradient(120deg,var(--navy-950),#0e2a3a);
  color:var(--paper-0);border-radius:var(--radius-lg);padding:52px;
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.cta-band h2{max-width:520px;}
.cta-band-actions{display:flex;gap:14px;flex-wrap:wrap;}

/* ---------- Contact blocks ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start;}
@media (max-width:900px){.contact-grid{grid-template-columns:1fr;}}
.contact-line{display:flex;gap:16px;align-items:flex-start;padding:18px 0;border-bottom:1px solid var(--border-200);}
.contact-line:last-child{border-bottom:none;}
.contact-line .ic{width:44px;height:44px;border-radius:12px;background:rgba(6,182,212,.12);color:var(--cyan-500);display:flex;align-items:center;justify-content:center;flex:none;}
.contact-line .ic svg{width:22px;height:22px;}
.contact-line strong{display:block;margin-bottom:4px;}
.contact-line a{color:var(--ink-700);}
.contact-line a:hover{color:var(--cyan-500);}
.map-frame{border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border-200);box-shadow:var(--shadow-sm);}
.map-frame iframe{width:100%;height:340px;border:0;display:block;}

/* ---------- Breadcrumb ---------- */
.breadcrumb{padding:16px 0;font-size:.85rem;color:var(--ink-500);}
.breadcrumb a{color:var(--ink-500);}
.breadcrumb a:hover{color:var(--cyan-500);}
.breadcrumb span[aria-current]{color:var(--ink-900);font-weight:600;}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy-950);color:var(--ink-300);padding:64px 0 28px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.08);}
@media (max-width:900px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.footer-grid{grid-template-columns:1fr;}}
.footer-col h4{color:var(--paper-0);font-size:.9rem;margin-bottom:16px;letter-spacing:.02em;}
.footer-col ul{display:flex;flex-direction:column;gap:10px;}
.footer-col a{font-size:.92rem;color:var(--ink-300);}
.footer-col a:hover{color:var(--paper-0);}
.footer-brand p{margin-top:14px;font-size:.9rem;color:var(--ink-300);max-width:280px;}
.footer-social{display:flex;gap:10px;margin-top:16px;}
.footer-social a{width:36px;height:36px;border-radius:10px;background:rgba(255,255,255,.06);display:flex;align-items:center;justify-content:center;}
.footer-social a:hover{background:rgba(255,255,255,.14);}
.footer-social svg{width:17px;height:17px;}
.footer-bottom{padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:.82rem;color:var(--ink-500);}

/* ---------- Sticky mobile CTA ---------- */
.mobile-cta{
  position:fixed;left:0;right:0;bottom:0;z-index:90;display:none;
  background:var(--navy-950);border-top:1px solid rgba(255,255,255,.1);
  padding:10px 14px;gap:10px;
}
.mobile-cta a{flex:1;justify-content:center;}
@media (max-width:640px){
  .mobile-cta{display:flex;}
  body{padding-bottom:70px;}
}

/* ---------- Misc ---------- */
.divider{height:1px;background:var(--border-200);margin:0;}
.text-center{text-align:center;}
.stack{display:flex;flex-direction:column;gap:10px;}
.kicker-icon{width:60px;height:60px;border-radius:16px;background:rgba(6,182,212,.12);color:var(--cyan-500);display:flex;align-items:center;justify-content:center;}
.kicker-icon svg{width:30px;height:30px;}