:root {
  --bg: #071127;
  --panel: #0f1f3d;
  --text: #f5f7ff;
  --muted: #b4c2e0;
  --primary: #5ad1ff;
  --primary-strong: #36b4e6;
  --card: #102446;
  --border: rgba(255, 255, 255, 0.12);
}

body.light {
  --bg: #f2f6ff;
  --panel: #ffffff;
  --text: #15213d;
  --muted: #485b86;
  --primary: #0a7ed6;
  --primary-strong: #0463ae;
  --card: #ffffff;
  --border: rgba(21, 33, 61, 0.14);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: radial-gradient(circle at top right, #1b346a 0, var(--bg) 60%);
  color: var(--text);
  line-height: 1.5;
}

.container {
  width: min(1100px, 92vw);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 0;
}

.brand {
  color: var(--text);
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  gap: 0.5rem;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 0.5rem;
  background: var(--primary);
  color: #02223d;
}

.top-nav {
  display: flex;
  gap: 1rem;
}

.top-nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
}

.top-nav a:hover { color: var(--text); }

.theme-toggle {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  padding: 0.35rem 0.8rem;
}

.hero {
  padding: 5rem 0 4rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
}

h1 {
  margin: 0.3rem 0 1rem;
  line-height: 1.1;
  font-size: clamp(2rem, 5vw, 3.2rem);
}

.lead {
  color: var(--muted);
  max-width: 56ch;
}

.eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  color: var(--primary);
  font-weight: 700;
}

.hero-card,
.card,
.contact-form,
.project {
  background: color-mix(in srgb, var(--card) 90%, transparent);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
}

.hero-card ul {
  padding-left: 1.25rem;
  color: var(--muted);
}

.hero-cta {
  display: flex;
  gap: 0.8rem;
  margin-top: 1.5rem;
}

.btn {
  display: inline-block;
  border-radius: 0.7rem;
  padding: 0.6rem 1rem;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover { background: var(--primary-strong); }

.btn-secondary {
  border-color: var(--border);
  color: var(--text);
}

.section {
  padding: 3.5rem 0;
}

.alt {
  background: color-mix(in srgb, var(--panel) 60%, transparent);
  border-block: 1px solid var(--border);
}

.card-grid,
.project-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card p,
.project p {
  color: var(--muted);
}

.contact-wrap {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.2rem;
}

.contact-form {
  display: grid;
  gap: 0.7rem;
}

label {
  font-size: 0.9rem;
  display: grid;
  gap: 0.4rem;
}

input,
textarea {
  width: 100%;
  border-radius: 0.6rem;
  border: 1px solid var(--border);
  padding: 0.6rem;
  background: var(--panel);
  color: var(--text);
}

.form-message {
  margin: 0;
  min-height: 1.2rem;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.2rem 0;
  color: var(--muted);
}

@media (max-width: 900px) {
  .hero-grid,
  .contact-wrap,
  .card-grid,
  .project-list {
    grid-template-columns: 1fr;
  }

  .top-nav {
    display: none;
  }
}
.ai-box {
  display: grid;
  gap: 0.6rem;
  max-width: 700px;
}

#ai-input {
  min-height: 100px;
}

.ai-response {
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  padding: 0.8rem;
  background: var(--panel);
  min-height: 60px;
}