/* ============ RESET & BASE ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #1f2937;
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

:root {
  --primary: #0a66c2;
  --primary-dark: #074a8f;
  --primary-light: #e8f1fb;
  --accent: #00b8d4;
  --dark: #0f172a;
  --gray: #64748b;
  --light-gray: #f8fafc;
  --border: #e2e8f0;
  --white: #ffffff;
  --shadow: 0 4px 20px rgba(10, 102, 194, 0.08);
  --shadow-lg: 0 10px 40px rgba(10, 102, 194, 0.12);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============ HEADER ============ */
.header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.logo {
  display: flex;
  align-items: center;
  height: 56px;
}
.logo img {
  max-height: 48px;
  width: auto;
  object-fit: contain;
  display: block;
}
.logo-text {
  display: none; /* SiberBT logosu kendi yazısını içerdiği için gizlendi */
}

.nav { display: flex; align-items: center; gap: 32px; }
.nav a {
  font-weight: 500;
  font-size: 15px;
  color: #334155;
  transition: color 0.2s;
  position: relative;
}
.nav a:hover, .nav a.active { color: var(--primary); }
.nav a.btn-primary,
.nav a.btn-primary:hover {
  color: white;
}
.nav a.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: none;
  transition: all 0.25s;
  text-align: center;
}
.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 14px rgba(10, 102, 194, 0.3);
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(10, 102, 194, 0.4);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: white; }

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 26px;
  cursor: pointer;
  color: var(--dark);
}

/* ============ HERO ============ */
.hero {
  background: linear-gradient(135deg, #f0f7ff 0%, #ffffff 60%, #f8fafc 100%);
  padding: 80px 0 100px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 184, 212, 0.1), transparent 70%);
  border-radius: 50%;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
}
.hero-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 52px;
  line-height: 1.15;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 22px;
  letter-spacing: -0.5px;
}
.hero h1 span {
  background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: 18px;
  color: var(--gray);
  margin-bottom: 32px;
  max-width: 500px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-visual {
  position: relative;
  height: 460px;
}
.hero-card {
  position: absolute;
  background: white;
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  width: 230px;
  transition: transform 0.3s;
}
.hero-card:hover {
  transform: translateY(-6px);
}
.hero-card-1 {
  top: 0; left: 0;
}
.hero-card-2 {
  top: 30px; right: 0;
}
.hero-card-3 {
  bottom: 30px; left: 20px;
}
.hero-card-4 {
  bottom: 0; right: 20px;
}
.hero-card-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: var(--primary-light);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary);
  margin-bottom: 12px;
  font-size: 20px;
}
.hero-card h4 { font-size: 15px; margin-bottom: 4px; color: var(--dark); }
.hero-card p { font-size: 13px; color: var(--gray); margin: 0; }

/* ============ SECTIONS ============ */
.section { padding: 90px 0; }
.section-light { background: var(--light-gray); }
.section-header { text-align: center; max-width: 700px; margin: 0 auto 60px; }
.section-tag {
  color: var(--primary);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: block;
}
.section-header h2 {
  font-size: 40px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.section-header p { color: var(--gray); font-size: 17px; }

/* ============ SERVICES GRID ============ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}
.service-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px 28px;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 56px; height: 56px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px;
  margin-bottom: 20px;
}
.service-card h3 { font-size: 19px; margin-bottom: 12px; color: var(--dark); }
.service-card p { color: var(--gray); font-size: 15px; }

/* ============ FEATURES (Why Us) ============ */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
.feature {
  text-align: center;
  padding: 30px 20px;
}
.feature-num {
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}
.feature h4 { font-size: 17px; color: var(--dark); margin-bottom: 8px; }
.feature p { color: var(--gray); font-size: 14px; }

/* ============ CTA BANNER ============ */
.cta-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 60px;
  border-radius: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%; right: -10%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.1), transparent 70%);
  border-radius: 50%;
}
.cta-banner h3 { font-size: 28px; margin-bottom: 8px; position: relative; }
.cta-banner p { opacity: 0.9; position: relative; }
.cta-banner .btn {
  background: white;
  color: var(--primary);
  position: relative;
}
.cta-banner .btn:hover { background: var(--light-gray); }

/* ============ FOOTER ============ */
.footer {
  background: var(--dark);
  color: #cbd5e1;
  padding: 60px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer h5 {
  color: white;
  font-size: 16px;
  margin-bottom: 18px;
  font-weight: 700;
}
.footer p, .footer a, .footer li { font-size: 14px; color: #94a3b8; }
.footer ul li { margin-bottom: 10px; }
.footer a:hover { color: white; }
.footer-brand p { margin-top: 14px; max-width: 320px; }
.social { display: flex; gap: 10px; margin-top: 16px; }
.social a {
  width: 36px; height: 36px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
  color: white;
}
.social a:hover { background: var(--primary); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: #64748b;
}

/* ============ PAGE HERO (inner pages) ============ */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 70px 0;
  text-align: center;
}
.page-hero h1 { font-size: 44px; font-weight: 800; margin-bottom: 12px; }
.page-hero p { opacity: 0.9; font-size: 17px; }
.breadcrumb {
  margin-top: 14px;
  font-size: 14px;
  opacity: 0.85;
}
.breadcrumb a { color: white; }

/* ============ ABOUT ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-grid h2 { font-size: 36px; margin-bottom: 20px; color: var(--dark); }
.about-grid p { color: var(--gray); margin-bottom: 16px; }
.about-visual {
  background: linear-gradient(135deg, var(--primary-light), white);
  border-radius: 20px;
  padding: 40px;
  height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
}
.about-visual-icon {
  font-size: 120px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.values {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 30px;
}
.value-card {
  background: white;
  padding: 28px;
  border-radius: 14px;
  border: 1px solid var(--border);
  text-align: center;
}
.value-card .service-icon { margin: 0 auto 16px; }
.value-card h4 { color: var(--dark); margin-bottom: 8px; }
.value-card p { color: var(--gray); font-size: 14px; }

/* ============ REFERENCES ============ */
.logos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
}
.logo-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 30px 20px;
  text-align: center;
  font-weight: 700;
  font-size: 18px;
  color: var(--gray);
  transition: all 0.2s;
}
.logo-card:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: scale(1.04);
}
.testimonials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
  margin-top: 40px;
}
.testimonial {
  background: white;
  padding: 32px;
  border-radius: 14px;
  border: 1px solid var(--border);
  position: relative;
}
.testimonial::before {
  content: '"';
  position: absolute;
  top: 10px; right: 20px;
  font-size: 70px;
  color: var(--primary-light);
  font-family: Georgia, serif;
  line-height: 1;
}
.testimonial p { color: #475569; font-style: italic; margin-bottom: 20px; position: relative; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.author-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
}
.author-info strong { color: var(--dark); font-size: 15px; display: block; }
.author-info span { color: var(--gray); font-size: 13px; }

/* ============ CONTACT ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 50px;
}
.contact-info-card {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: 40px;
  border-radius: 16px;
}
.contact-info-card h3 { font-size: 24px; margin-bottom: 12px; }
.contact-info-card > p { opacity: 0.9; margin-bottom: 30px; }
.contact-item {
  display: flex;
  gap: 14px;
  margin-bottom: 22px;
}
.contact-item-icon {
  width: 40px; height: 40px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.contact-item h5 { color: white; font-size: 14px; opacity: 0.8; margin-bottom: 2px; font-weight: 500; }
.contact-item p { color: white; font-weight: 600; margin: 0; }

.contact-form {
  background: white;
  padding: 40px;
  border-radius: 16px;
  border: 1px solid var(--border);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  transition: all 0.2s;
  background: var(--light-gray);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  background: white;
  box-shadow: 0 0 0 3px rgba(10, 102, 194, 0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

.map-embed {
  margin-top: 60px;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--light-gray);
  height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray);
  font-size: 15px;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
  .hero-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 38px; }
  .hero-visual { height: 380px; }
  .section-header h2 { font-size: 30px; }
  .page-hero h1 { font-size: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cta-banner { padding: 40px 28px; text-align: center; justify-content: center; }
}
@media (max-width: 640px) {
  .nav {
    display: none;
    position: absolute;
    top: 76px; left: 0; right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav.active { display: flex; }
  .menu-toggle { display: block; }
  .section { padding: 60px 0; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-visual { height: auto; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .hero-card { position: static; width: 100%; }
}