/* =============================================
   DSA Bilişim — Corporate Website Styles
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- Reset & Variables --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --navy: #0a1628;
  --navy-light: #111d33;
  --navy-mid: #162240;
  --accent: #3b82f6;
  --accent-bright: #60a5fa;
  --accent-glow: rgba(59,130,246,0.15);
  --cyan: #22d3ee;
  --green: #34d399;
  --white: #f8fafc;
  --gray-100: #e2e8f0;
  --gray-200: #cbd5e1;
  --gray-300: #94a3b8;
  --gray-400: #64748b;
  --gray-500: #475569;
  --radius: 12px;
  --radius-lg: 20px;
  --font: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --shadow: 0 4px 24px rgba(0,0,0,0.12);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.2);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--navy);
  color: var(--gray-100);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: color var(--transition); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* --- Utilities --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; position: relative; }
.section-sm { padding: 60px 0; }

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent-bright); background: var(--accent-glow);
  padding: 6px 14px; border-radius: 100px;
  border: 1px solid rgba(59,130,246,0.2);
}
.badge::before { content: ''; width: 6px; height: 6px; background: var(--accent); border-radius: 50%; }

.section-title {
  font-size: clamp(2rem, 5vw, 3rem); font-weight: 800;
  color: var(--white); line-height: 1.15; margin: 16px 0 20px;
}
.section-subtitle {
  font-size: 1.1rem; color: var(--gray-300); max-width: 600px; line-height: 1.7;
}

/* --- Animated Background Grid --- */
.bg-grid {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background-image:
    linear-gradient(rgba(59,130,246,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none; z-index: 0;
}

/* --- Navbar --- */
.navbar {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  padding: 12px 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: all var(--transition);
}
.navbar.scrolled { padding: 8px 0; background: rgba(255,255,255,0.98); box-shadow: 0 2px 16px rgba(0,0,0,0.06); }
.navbar .container { display: flex; align-items: center; justify-content: space-between; }

.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.35rem; color: var(--white); }
.logo-img { height: 72px; width: auto; object-fit: contain; }
.logo-icon {
  width: 38px; height: 38px; background: linear-gradient(135deg, var(--accent), var(--cyan));
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; font-weight: 800; color: var(--navy); letter-spacing: -0.5px;
}
.logo span { color: var(--accent-bright); }

.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  font-size: 0.9rem; font-weight: 500; color: var(--gray-500);
  position: relative; padding: 4px 0;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px;
  background: var(--accent); border-radius: 2px; transition: width var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--navy); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-cta {
  background: var(--accent); color: var(--white) !important;
  padding: 10px 22px; border-radius: 10px; font-weight: 600; font-size: 0.85rem;
  transition: all var(--transition); border: none; cursor: pointer;
}
.nav-cta:hover { background: #2563eb; transform: translateY(-1px); box-shadow: 0 8px 24px rgba(59,130,246,0.3); }
.nav-cta::after { display: none !important; }

/* Mobile menu */
.menu-toggle {
  display: none; background: none; border: none; cursor: pointer;
  width: 32px; height: 24px; position: relative; z-index: 1001;
}
.menu-toggle span {
  display: block; width: 100%; height: 2px; background: var(--navy);
  border-radius: 2px; transition: all var(--transition);
  position: absolute; left: 0;
}
.menu-toggle span:nth-child(1) { top: 0; }
.menu-toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.menu-toggle span:nth-child(3) { bottom: 0; }
.menu-toggle.active span:nth-child(1) { top: 50%; transform: translateY(-50%) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { bottom: 50%; transform: translateY(50%) rotate(-45deg); }

/* --- Hero --- */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  padding-top: 80px; position: relative; overflow: hidden;
}
.hero-content { position: relative; z-index: 2; max-width: 720px; }
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 800;
  color: var(--white); line-height: 1.1; margin: 20px 0 24px;
}
.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--accent-bright), var(--cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc { font-size: 1.15rem; color: var(--gray-300); max-width: 540px; margin-bottom: 36px; }

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: var(--white);
  padding: 14px 28px; border-radius: 12px; font-weight: 600; font-size: 0.95rem;
  transition: all var(--transition); border: none; cursor: pointer;
}
.btn-primary:hover { background: #2563eb; transform: translateY(-2px); box-shadow: 0 12px 32px rgba(59,130,246,0.3); }
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  background: transparent; color: var(--white);
  padding: 14px 28px; border-radius: 12px; font-weight: 600; font-size: 0.95rem;
  border: 1px solid rgba(255,255,255,0.15); transition: all var(--transition); cursor: pointer;
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent-bright); background: var(--accent-glow); }

.hero-visual {
  position: absolute; right: -60px; top: 50%; transform: translateY(-50%);
  width: 500px; height: 500px; z-index: 1;
}
.hero-orb {
  width: 100%; height: 100%; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(59,130,246,0.15), rgba(34,211,238,0.05), transparent 70%);
  filter: blur(40px); animation: float 8s ease-in-out infinite;
}
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-30px); } }

/* Stats strip */
.stats-strip {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; background: rgba(59,130,246,0.08);
  border-radius: var(--radius-lg); overflow: hidden;
  margin-top: 60px; position: relative; z-index: 2;
}
.stat-item {
  background: var(--navy-light); padding: 28px 24px; text-align: center;
  transition: background var(--transition);
}
.stat-item:hover { background: var(--navy-mid); }
.stat-number {
  font-size: 2rem; font-weight: 800; color: var(--accent-bright);
  font-family: var(--mono); line-height: 1;
}
.stat-label { font-size: 0.8rem; color: var(--gray-400); margin-top: 6px; font-weight: 500; }

/* --- Service Cards --- */
.services-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px; margin-top: 48px;
}
.service-card {
  background: var(--navy-light);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-lg); padding: 36px 28px;
  transition: all var(--transition); position: relative; overflow: hidden;
  cursor: default;
}
.service-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  opacity: 0; transition: opacity var(--transition);
}
.service-card:hover { transform: translateY(-4px); border-color: rgba(59,130,246,0.2); box-shadow: var(--shadow-lg); }
.service-card:hover::before { opacity: 1; }

.service-icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: var(--accent-glow); display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 20px;
}
.service-card h3 { font-size: 1.15rem; font-weight: 700; color: var(--white); margin-bottom: 12px; }
.service-card p { font-size: 0.9rem; color: var(--gray-400); line-height: 1.65; margin-bottom: 16px; }

.service-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.service-tag {
  font-size: 0.72rem; font-weight: 500; color: var(--gray-300);
  background: rgba(255,255,255,0.04); padding: 4px 10px; border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.06);
}

/* --- Projects --- */
.projects-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px; margin-top: 48px;
}
.project-card {
  background: var(--navy-light); border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: all var(--transition);
}
.project-card:hover { transform: translateY(-4px); border-color: rgba(59,130,246,0.15); box-shadow: var(--shadow-lg); }
.project-thumb {
  height: 180px; position: relative; overflow: hidden;
}
.project-thumb-bg {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.5rem;
}
.project-body { padding: 24px; }
.project-body h3 { font-size: 1.05rem; font-weight: 700; color: var(--white); margin-bottom: 8px; }
.project-body p { font-size: 0.85rem; color: var(--gray-400); line-height: 1.6; }
.project-cats { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.project-cat {
  font-size: 0.7rem; font-weight: 600; padding: 4px 10px; border-radius: 6px;
  color: var(--accent-bright); background: var(--accent-glow);
  border: 1px solid rgba(59,130,246,0.15);
}

/* --- About --- */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
  margin-top: 48px; align-items: start;
}
.about-text p { margin-bottom: 16px; color: var(--gray-300); font-size: 0.95rem; }
.about-text p:first-child { font-size: 1.05rem; color: var(--gray-200); }

.expertise-list { display: flex; flex-direction: column; gap: 12px; margin-top: 24px; }
.expertise-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--navy-light); border: 1px solid rgba(255,255,255,0.05);
  padding: 14px 18px; border-radius: var(--radius); transition: all var(--transition);
}
.expertise-item:hover { border-color: rgba(59,130,246,0.15); transform: translateX(4px); }
.expertise-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); flex-shrink: 0; }
.expertise-item span { font-size: 0.88rem; color: var(--gray-200); font-weight: 500; }

.tech-stack { margin-top: 36px; }
.tech-stack h3 { font-size: 1rem; font-weight: 700; color: var(--white); margin-bottom: 16px; }
.tech-badges { display: flex; flex-wrap: wrap; gap: 8px; }
.tech-badge {
  font-family: var(--mono); font-size: 0.75rem; font-weight: 500;
  color: var(--cyan); background: rgba(34,211,238,0.08);
  padding: 6px 12px; border-radius: 8px;
  border: 1px solid rgba(34,211,238,0.12);
}

/* --- Contact --- */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-top: 48px;
}
.contact-info-cards { display: flex; flex-direction: column; gap: 16px; }
.contact-card {
  display: flex; align-items: center; gap: 16px;
  background: var(--navy-light); border: 1px solid rgba(255,255,255,0.05);
  padding: 20px 24px; border-radius: var(--radius); transition: all var(--transition);
}
.contact-card:hover { border-color: rgba(59,130,246,0.15); }
.contact-card-icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--accent-glow); display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; flex-shrink: 0;
}
.contact-card-text h4 { font-size: 0.85rem; font-weight: 600; color: var(--white); }
.contact-card-text p { font-size: 0.85rem; color: var(--gray-400); margin-top: 2px; }

.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { position: relative; }
.form-group input, .form-group textarea {
  width: 100%; padding: 14px 18px; border-radius: var(--radius);
  background: var(--navy-light); border: 1px solid rgba(255,255,255,0.08);
  color: var(--white); font-family: var(--font); font-size: 0.9rem;
  transition: border-color var(--transition); outline: none;
}
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--gray-500); }
.form-group input:focus, .form-group textarea:focus { border-color: var(--accent); }
.form-group textarea { min-height: 120px; resize: vertical; }

/* --- Footer --- */
.footer {
  padding: 48px 0 24px;
  background: #fff;
  border-top: 1px solid rgba(0,0,0,0.06);
  position: relative; z-index: 2;
}
.footer-top { display: flex; justify-content: space-between; align-items: start; margin-bottom: 36px; flex-wrap: wrap; gap: 32px; }
.footer-brand .logo-img { height: 64px; }
.footer-brand p { color: var(--gray-500); font-size: 0.85rem; max-width: 320px; margin-top: 12px; line-height: 1.6; }
.footer-links h4 { font-size: 0.8rem; font-weight: 600; color: var(--gray-400); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 12px; }
.footer-links a { display: block; font-size: 0.88rem; color: var(--gray-500); padding: 4px 0; transition: color var(--transition); }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { text-align: center; padding-top: 24px; border-top: 1px solid rgba(0,0,0,0.06); }
.footer-bottom p { font-size: 0.8rem; color: var(--gray-400); }

/* --- Fade-in animation --- */
.fade-in {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* --- About Page --- */
.about-two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.about-stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.about-stat-card {
  background: var(--navy-light); border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius); padding: 28px 20px; text-align: center;
}
.about-stat-num { font-size: 2.2rem; font-weight: 800; color: var(--accent-bright); font-family: var(--mono); line-height: 1; }
.about-stat-label { font-size: 0.82rem; color: var(--gray-400); margin-top: 8px; }
.expertise-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* --- Contact Page --- */
.contact-cards-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.contact-card-h {
  display: flex; align-items: center; gap: 14px;
  background: var(--navy-light); border: 1px solid rgba(255,255,255,0.05);
  padding: 20px; border-radius: var(--radius); transition: all var(--transition);
  text-decoration: none; color: inherit;
}
.contact-card-h:hover { border-color: rgba(59,130,246,0.15); }
.contact-card-h h4 { font-size: 0.85rem; font-weight: 600; color: var(--white); }
.contact-card-h p { font-size: 0.82rem; color: var(--gray-400); margin-top: 2px; }
.contact-form-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 24px; align-items: start; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .services-grid, .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-visual { display: none; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-cards-row { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .nav-links {
    position: fixed; top: 0; right: -100%; width: 80%; max-width: 320px; height: 100vh;
    flex-direction: column; background: #fff; padding: 80px 32px 32px;
    gap: 20px; transition: right var(--transition);
    border-left: 1px solid rgba(0,0,0,0.06);
    box-shadow: -8px 0 32px rgba(0,0,0,0.1);
  }
  .nav-links.open { right: 0; }
  .menu-toggle { display: block; }

  .services-grid, .projects-grid { grid-template-columns: 1fr; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-two-col { grid-template-columns: 1fr; gap: 32px; }
  .expertise-grid-3 { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .contact-cards-row { grid-template-columns: 1fr; }
  .contact-form-grid { grid-template-columns: 1fr; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); }
  .hero { min-height: auto; padding: 120px 0 60px; }
  .hero-title { font-size: 2rem; }
  .footer-top { flex-direction: column; }
}

@media (max-width: 480px) {
  .stats-strip { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn-primary, .hero-actions .btn-outline { width: 100%; justify-content: center; }
  .about-stats-grid { grid-template-columns: 1fr 1fr; }
}