* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg: #0b0e14;
  --panel: #121722;
  --accent: #00e5ff;
  --accent2: #7b61ff;
  --text: #d7e0ea;
  --dim: #6b7686;
}
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 2rem;
  border-bottom: 1px solid #1e2636;
  background: linear-gradient(180deg, #0d1120, #0b0e14);
}
.logo {
  font-family: "Consolas", monospace;
  font-size: 1.35rem;
  font-weight: bold;
  letter-spacing: 1px;
}
.logo .core { color: var(--accent); }
.logo .lab { color: var(--accent2); }
nav a {
  color: var(--dim);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.95rem;
  transition: color .2s;
}
nav a:hover { color: var(--accent); }
main {
  flex: 1;
  max-width: 860px;
  margin: 0 auto;
  padding: 4rem 2rem;
  width: 100%;
}
h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
p.lead {
  font-size: 1.05rem;
  color: var(--dim);
  line-height: 1.7;
  margin-bottom: 2rem;
}
.placeholder {
  border: 1px dashed #1e2636;
  border-radius: 8px;
  padding: 1.2rem;
  color: var(--dim);
  font-family: "Consolas", monospace;
  background: var(--panel);
}
footer {
  padding: 1.2rem 2rem;
  border-top: 1px solid #1e2636;
  color: var(--dim);
  font-size: .8rem;
  text-align: center;
}
footer .hobby { color: var(--accent2); }

.card {
  background: var(--panel);
  border: 1px solid #1e2636;
  border-radius: 10px;
  padding: 1.2rem 1.4rem;
  margin-bottom: 1.5rem;
}
.card h3 {
  color: var(--accent);
  font-size: 1.05rem;
  margin-bottom: .6rem;
}
.card p, .card li {
  color: var(--dim);
  font-size: .92rem;
  line-height: 1.6;
}
.card ul { padding-left: 1.2rem; margin: .4rem 0; }

/* ===== Burger-Menü (mobil) ===== */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  padding: .4rem;
}
.nav-burger span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--accent);
  transition: transform .3s, opacity .3s;
}
@media (max-width: 768px) {
  header { padding: 1rem 1.2rem; }
  .nav-burger { display: flex; z-index: 30; }
  nav.nav-menu {
    display: flex;
    position: fixed;
    top: 0;
    right: -100%;
    width: min(72vw, 260px);
    height: 100vh;
    background: var(--panel);
    border-left: 1px solid #1e2636;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    padding: 5.5rem 2rem 2rem;
    gap: 1.6rem;
    z-index: 20;
    transition: right .3s;
  }
  nav.nav-menu a { margin-left: 0; font-size: 1.15rem; }
  nav.nav-menu a:hover { color: var(--accent); }
  .nav-toggle:checked ~ .nav-menu { right: 0; }
  .nav-toggle:checked ~ .nav-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle:checked ~ .nav-burger span:nth-child(2) { opacity: 0; }
  .nav-toggle:checked ~ .nav-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}