:root {
  --bg: #0a0f1f; /* koyu lacivert arka plan (hero) */
  --ink: #0a192f; /* başlık metin rengi */
  --muted: #5b708b; /* ikincil metin */
  --paper: #ffffff; /* arka plan */
  --card: #0a192f; /* kart başlığı rengi */
  --brand: #3a86ff; /* vurgu mavi */
  --accent: #fca311; /* vurgu turuncu */
  --line: #edf1f7;
  --radius: 18px;
  --shadow: 0 8px 24px rgba(10, 25, 47, 0.06);
}
* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial,
    sans-serif;
  color: var(--ink);
  background: var(--paper);
}
a {
  color: var(--brand);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  font-weight: 800;
  letter-spacing: 0.3px;
}
.nav a {
  font-weight: 600;
  color: var(--ink);
  margin-left: 18px;
}
.nav a.btn {
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--bg) 0%, #10213f 100%);
  color: #fff;
  padding: 96px 0 88px;
}
.hero h1 {
  font-size: 44px;
  line-height: 1.15;
  margin: 0 0 12px;
}
.hero p {
  font-size: 18px;
  opacity: 0.9;
  max-width: 800px;
  margin: 0 0 28px;
}
.pill {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 8px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}
.hero .cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.btn-primary {
  background: var(--accent);
  color: #111;
  padding: 12px 16px;
  border-radius: 12px;
  font-weight: 700;
  border: none;
  box-shadow: var(--shadow);
}
.btn-secondary {
  background: transparent;
  color: #fff;
  padding: 12px 16px;
  border-radius: 12px;
  font-weight: 700;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

/* Sections */
section {
  padding: 72px 0;
  border-bottom: 1px solid var(--line);
}
section h2 {
  font-size: 28px;
  margin: 0 0 12px;
}
section p.lead {
  color: var(--muted);
  max-width: 800px;
}

/* About grid */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  margin-top: 24px;
}
.kpi {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 10px;
}
.kpi .card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
}
.kpi .card h3 {
  margin: 2px 0 4px;
  font-size: 22px;
}
.kpi .card span {
  color: var(--muted);
  font-size: 12px;
}

/* Projects */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 24px;
}
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  background: #fff;
}
.card h3 {
  margin: 0 0 6px;
  color: var(--card);
}
.card p {
  color: var(--muted);
  margin: 0 0 12px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 12px;
  color: #0b5a18;
  background: #e9fce9;
}
.badge.beta {
  color: #7a4b00;
  background: #fff8e6;
  border-color: #ffe0a6;
}
.badge.soon {
  color: #002f6c;
  background: #eaf3ff;
  border-color: #cfe4ff;
}
.card .actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.ghost {
  border: 1px solid var(--line);
  padding: 10px 12px;
  border-radius: 12px;
  font-weight: 600;
}

/* Contact */
.contact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 24px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  margin-top: 18px;
}
.contact a {
  font-weight: 700;
}
.social {
  display: flex;
  gap: 14px;
}

/* Footer */
footer {
  padding: 38px 0;
  color: var(--muted);
  font-size: 14px;
}

/* Responsive */
@media (max-width: 1000px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 640px) {
  .cards {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 34px;
  }
  .nav a {
    margin-left: 12px;
  }
  header .hide-sm {
    display: none;
  }
}

li {
  list-style: none;
}