/* ============ Variables (Ontu Bilişim brand: navy + teal) ============ */
:root {
  --navy-900: #192941;
  --navy-800: #1e3252;
  --navy-700: #24395c;
  --navy-600: #2c4670;
  --teal: #009a9b;
  --teal-dark: #007f80;
  --teal-light: #14b3b4;
  --teal-a11y: #046669;
  --bg-light: #f6f8fb;
  --bg-light-2: #eef2f8;
  --ink: #192941;
  --ink-soft: #3d4a5e;
  --muted: #5e646c;
  --muted-dark: #94999f;
  --border: #e2e7f0;
  --border-dark: rgba(255, 255, 255, 0.09);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 10px rgba(25, 41, 65, 0.06);
  --shadow-md: 0 14px 34px rgba(25, 41, 65, 0.12);
  --shadow-lg: 0 26px 64px rgba(25, 41, 65, 0.22);
  --container-w: 1180px;
  --transition: 0.25s ease;
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
}

/* ============ Reset ============ */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg-light);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, dl { list-style: none; }
button { font-family: inherit; cursor: pointer; }
svg { width: 100%; height: 100%; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

.container { max-width: var(--container-w); margin: 0 auto; padding: 0 24px; }

h1, h2, h3, h4 { font-weight: 700; letter-spacing: -0.02em; color: var(--ink); }
h1 { font-size: clamp(2.1rem, 4.3vw, 3.4rem); line-height: 1.16; color: #fff; }
h2 { font-size: clamp(1.6rem, 2.8vw, 2.2rem); line-height: 1.22; }
h3 { font-size: 1.1rem; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--navy-600);
  margin-bottom: 14px;
}
.eyebrow-accent { color: var(--teal); }
.contact .eyebrow-accent { color: var(--teal-a11y); }
.eyebrow::before { content: ""; width: 16px; height: 1px; background: currentColor; }

.mono-tag { font-family: var(--font-mono); font-size: 0.7rem; font-weight: 600; letter-spacing: 0.06em; }

.section-desc { color: var(--muted); font-size: 1rem; max-width: 560px; }
.section-desc.long { max-width: 620px; margin-bottom: 28px; }
.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head.center { max-width: 640px; margin-left: auto; margin-right: auto; text-align: center; }
.section-head.center .section-desc { margin-left: auto; margin-right: auto; }
.section-head.center .eyebrow { justify-content: center; }
.section-head.center .eyebrow::before { display: none; }

/* ============ Buttons ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 0.92rem;
  border: 1px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
  white-space: nowrap;
}
.btn-primary { background: var(--teal); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--teal-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-ghost-dark { background: transparent; color: #fff; border-color: var(--border-dark); }
.btn-ghost-dark:hover { border-color: var(--teal-light); color: var(--teal-light); transform: translateY(-2px); }
.btn-lg { padding: 15px 28px; font-size: 0.98rem; }
.btn-block { width: 100%; }

/* ============ Header ============ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 74px; gap: 20px; }

.logo { display: flex; align-items: center; flex-shrink: 0; }
.logo-img { height: 44px; width: auto; display: block; }
.footer-brand .logo-img { height: 40px; }

.main-nav ul { display: flex; gap: 30px; }
.nav-link { font-weight: 500; font-size: 0.92rem; color: var(--ink-soft); position: relative; padding: 6px 0; transition: color var(--transition); }
.nav-link:hover, .nav-link.active { color: var(--navy-900); }
.nav-link.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -4px; height: 2px; background: var(--teal); border-radius: 2px; }

.header-actions { display: flex; align-items: center; gap: 16px; flex-shrink: 0; }

.lang-toggle { display: flex; border: 1px solid var(--border); border-radius: 999px; padding: 3px; gap: 2px; }
.lang-btn {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 600;
  padding: 5px 11px; border-radius: 999px; border: none; background: transparent;
  color: var(--muted); transition: background var(--transition), color var(--transition);
}
.lang-btn.active { background: var(--navy-900); color: var(--teal-light); }

.nav-toggle {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 40px; height: 40px; background: transparent; border: 1px solid var(--border); border-radius: 8px;
}
.nav-toggle span { display: block; width: 18px; height: 2px; background: var(--ink); margin: 0 auto; transition: transform var(--transition), opacity var(--transition); }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ Hero (dark navy) ============ */
.hero { position: relative; overflow: hidden; padding: 120px 0 90px; background: var(--navy-900); }
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(700px 460px at 88% 0%, rgba(0, 154, 155, 0.22), transparent 60%),
    radial-gradient(600px 460px at 5% 100%, rgba(0, 154, 155, 0.12), transparent 60%),
    linear-gradient(180deg, var(--navy-900), var(--navy-800));
}
.hero-bg::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(circle at 50% 30%, black, transparent 75%);
}
.hero-inner { position: relative; z-index: 1; text-align: center; max-width: 840px; margin: 0 auto; }
.hero h1 { margin-bottom: 20px; }
.accent { color: var(--teal-light); }
.hero-desc { color: rgba(255,255,255,0.72); font-size: 1.08rem; max-width: 640px; margin: 0 auto 36px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 68px; }

.hero-stats {
  display: flex; justify-content: center; gap: 64px; flex-wrap: wrap;
  padding-top: 40px;
  border-top: 1px solid var(--border-dark);
}
.stat { display: flex; flex-direction: column; align-items: center; }
.stat-figure { display: flex; align-items: baseline; gap: 2px; }
.stat-num, .stat-plus { font-family: var(--font-mono); font-size: 1.9rem; font-weight: 700; color: #fff; }
.stat-plus { color: var(--teal-light); }
.stat-label { font-size: 0.82rem; color: rgba(255,255,255,0.6); margin-top: 6px; }

/* ============ About ============ */
.about { padding: 100px 0; }
.about-inner { max-width: 720px; margin: 0 auto; }

/* ============ Expertise (dark navy dashboard) ============ */
.expertise { padding: 100px 0; background: var(--navy-900); }
.expertise .eyebrow { justify-content: center; }
.expertise h2 { color: #fff; }

.module-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.module-card {
  background: var(--navy-800);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 26px 20px;
  display: flex; flex-direction: column; gap: 10px;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}
.module-card:hover { transform: translateY(-4px); border-color: var(--teal); background: var(--navy-700); }
.module-code { font-family: var(--font-mono); font-size: 1.6rem; font-weight: 700; color: var(--teal-light); }
.module-name { font-size: 0.86rem; color: rgba(255,255,255,0.72); }

/* ============ Services ============ */
.services { padding: 100px 0; }
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.service-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 30px;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }
.service-index { font-family: var(--font-mono); font-size: 0.78rem; font-weight: 600; color: var(--teal-dark); display: block; margin-bottom: 14px; }
.service-card h3 { margin-bottom: 10px; }
.service-card p { color: var(--muted); font-size: 0.94rem; }

/* ============ Contact ============ */
.contact { padding: 100px 0; background: var(--bg-light-2); }
.contact-inner { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 60px; }
.contact-list { margin-top: 30px; display: flex; flex-direction: column; gap: 20px; }
.contact-list li { display: flex; align-items: flex-start; gap: 16px; }
.contact-icon {
  width: 44px; height: 44px; flex-shrink: 0;
  background: rgba(0,154,155,0.1); color: var(--teal-dark);
  border-radius: var(--radius-sm); padding: 11px;
}
.contact-list strong { display: block; font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); font-weight: 600; margin-bottom: 3px; }
.contact-list a, .contact-list span { font-weight: 600; color: var(--ink); }
.contact-list a:hover { color: var(--teal-dark); }

.contact-form {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 38px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.82rem; font-weight: 600; margin-bottom: 6px; color: var(--ink-soft); }
.form-group input, .form-group textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-family: inherit; font-size: 0.94rem; background: #fff;
  transition: border-color var(--transition), box-shadow var(--transition); resize: vertical;
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--teal); box-shadow: 0 0 0 3px rgba(0,154,155,0.14);
}
.form-note { margin-top: 14px; font-size: 0.88rem; font-weight: 600; min-height: 1.2em; color: var(--teal-dark); }
.form-note.error { color: #c0392b; }
.hidden-field { display: none; }

.form-consent { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 18px; }
.form-consent input[type="checkbox"] { margin-top: 3px; width: 16px; height: 16px; accent-color: var(--teal); flex-shrink: 0; }
.form-consent label { font-size: 0.86rem; color: var(--ink-soft); line-height: 1.5; }
.link-btn {
  background: none; border: none; padding: 0; margin: 0; font: inherit; cursor: pointer;
  color: var(--teal-a11y); text-decoration: underline; text-underline-offset: 2px;
}
.link-btn:hover { color: var(--teal-dark); }

.kvkk-dialog { border: none; border-radius: var(--radius-lg); padding: 0; max-width: 620px; width: calc(100% - 40px); box-shadow: var(--shadow-lg); }
.kvkk-dialog::backdrop { background: rgba(25, 41, 65, 0.55); }
.kvkk-dialog-inner { position: relative; padding: 36px 32px 32px; max-height: 80vh; overflow-y: auto; }
.kvkk-dialog h3 { margin-bottom: 16px; }
.kvkk-dialog p { color: var(--muted); font-size: 0.92rem; margin-bottom: 14px; }
.kvkk-dialog .btn { margin-top: 8px; }
.kvkk-close {
  position: absolute; top: 16px; right: 16px; width: 32px; height: 32px; border-radius: 50%;
  border: none; background: var(--bg-light-2); color: var(--ink-soft); font-size: 1.3rem; line-height: 1;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.kvkk-close:hover { background: var(--border); }

/* ============ Footer ============ */
.site-footer { background: var(--navy-900); color: rgba(255,255,255,0.68); padding-top: 68px; }
.footer-inner { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 52px; }
.footer-brand p { margin-top: 16px; font-size: 0.88rem; max-width: 260px; }
.footer-col h4 { font-family: var(--font-mono); color: var(--teal-light); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 18px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; font-size: 0.88rem; }
.footer-col a:hover { color: #fff; }

.footer-bottom { border-top: 1px solid var(--border-dark); padding: 20px 0; }
.footer-bottom-inner { display: flex; justify-content: center; font-size: 0.82rem; }

/* ============ Scroll to top ============ */
.scroll-top {
  position: fixed; bottom: 28px; right: 28px; width: 46px; height: 46px; border-radius: 50%;
  background: var(--teal); color: #fff; border: none; font-size: 1.1rem; font-weight: 700;
  box-shadow: var(--shadow-md); display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 90;
}
.scroll-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.scroll-top:hover { background: var(--teal-dark); }

/* ============ Reveal animation ============ */
[data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
[data-reveal].revealed { opacity: 1; transform: translateY(0); }

/* ============ Responsive ============ */
@media (max-width: 980px) {
  .contact-inner { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .module-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .main-nav {
    position: fixed; top: 74px; left: 0; right: 0; background: #fff;
    border-bottom: 1px solid var(--border); transform: translateY(-130%);
    transition: transform var(--transition); box-shadow: var(--shadow-md);
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav ul { flex-direction: column; gap: 0; padding: 8px 24px 20px; }
  .main-nav .nav-link { display: block; padding: 14px 0; border-bottom: 1px solid var(--border); }
  .nav-toggle { display: flex; }
  .header-cta { display: none; }
  .logo-img { height: 34px; }
  .hero { padding: 60px 0 52px; }
  .hero-stats { gap: 40px; }
  .services-grid { grid-template-columns: 1fr; }
  .module-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
}