:root {
  --bg: #0b0d10;
  --bg-elev: #12151a;
  --text: #e8edf2;
  --muted: #a9b4c2;
  --accent: #5cc8ff;
  --border: #1e2430;
  --card: #0f1318;
  --success: #2ecc71;
  --error: #ff6b6b;
}

html[data-theme="light"] {
  --bg: #f7f9fc;
  --bg-elev: #ffffff;
  --text: #0e1217;
  --muted: #5a6b7d;
  --accent: #0066ff;
  --border: #e6ebf2;
  --card: #ffffff;
}
html {
  scroll-behavior: smooth;
}
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial,
    sans-serif;
  background: radial-gradient(
      1200px 800px at 80% -10%,
      rgba(92, 200, 255, 0.12),
      transparent 60%
    ),
    radial-gradient(
      1000px 600px at -10% 0%,
      rgba(0, 102, 255, 0.08),
      transparent 55%
    ),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 1080px;
  margin-inline: auto;
  padding: 24px;
}

.site-header,
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.4px;
  text-decoration: none;
  color: var(--text);
  padding: 8px 12px;
  border-radius: 12px;
  background: linear-gradient(120deg, var(--bg-elev), transparent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav a {
  color: var(--text);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 10px;
}

.nav a:hover {
  background: var(--bg-elev);
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.08s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}
.btn:active {
  transform: translateY(0);
}

.btn-outline {
  background: transparent;
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  padding: 8px 10px;
}

.muted {
  color: var(--muted);
}
.error {
  color: var(--error);
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 24px;
  padding-top: 24px;
}
.hero__text h1 {
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.2;
  margin: 0 0 12px;
}
.hero__text p {
  color: var(--muted);
  max-width: 60ch;
  margin: 0 0 18px;
}
.hero__cta {
  display: flex;
  gap: 12px;
}
.accent {
  color: var(--accent);
}

.hero__img {
  width: 100%;
  aspect-ratio: 4/3;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: linear-gradient(
      160deg,
      rgba(92, 200, 255, 0.18),
      rgba(0, 102, 255, 0.18)
    ),
    url("images/resim.webp") center/cover no-repeat;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 28px;
}
.section-head h2 {
  margin: 0;
  font-size: 24px;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
}
.toolbar input[type="search"] {
  width: min(54vw, 360px);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 12px;
  outline: none;
}
.checkbox {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  user-select: none;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
}

.project {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 12px;
}

.project__thumb {
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #111;
  overflow: hidden;
}
.project__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.project__title {
  font-weight: 700;
  margin: 0;
}
.project__summary {
  color: var(--muted);
  margin: 6px 0 10px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}
.chip {
  font-size: 12px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
}

.links {
  display: flex;
  gap: 12px;
}

.btn-accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-accent:hover {
  filter: brightness(1.06);
}
.about {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 16px;
  margin-top: 10px;
}

form.card {
  max-width: 640px;
}
.form-row {
  display: grid;
  gap: 6px;
  margin-bottom: 12px;
}
.form-row input,
.form-row textarea {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
}
.form-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-footer {
  border-top: 1px dashed var(--border);
  margin-top: 32px;
  padding-top: 18px;
}
.socials {
  display: flex;
  gap: 12px;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
  }
  .about {
    grid-template-columns: 1fr;
  }
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 640px) {
  .grid {
    grid-template-columns: 1fr;
  }
  .toolbar {
    flex-wrap: wrap;
  }
}
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
}
.skip-link:focus {
  left: 16px;
  top: 8px;
  background: var(--accent);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
}