:root {
  --bg: #ffffff;
  --surface: #f5f6fa;
  --text: #1c1e26;
  --muted: #5b6070;
  --brand: #4f46e5;
  --brand-dark: #3730a3;
  --border: #e3e5ec;
  --radius: 12px;
  --max: 1100px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main { flex: 1; }

img { max-width: 100%; display: block; }

a { color: var(--brand); }

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
}

.brand img { width: 32px; height: 32px; }

.nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

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

.nav a:hover,
.nav a[aria-current="page"] { color: var(--brand); }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text);
}

/* Hero */
.hero {
  position: relative;
  color: #fff;
  background: linear-gradient(135deg, rgba(55, 48, 163, 0.85), rgba(79, 70, 229, 0.6)),
    url("../images/hero.jpg") center / cover no-repeat, var(--brand-dark);
  padding: 7rem 0;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin: 0 0 1rem;
  line-height: 1.15;
}

.hero p {
  font-size: 1.2rem;
  max-width: 620px;
  margin: 0 auto 2rem;
  opacity: 0.92;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-light { background: #fff; color: var(--brand-dark); }
.btn-light:hover { background: var(--surface); }

/* Sections */
.section { padding: 5rem 0; }
.section-alt { background: var(--surface); }

.section h2 {
  font-size: 2rem;
  margin: 0 0 0.5rem;
  text-align: center;
}

.section .lead {
  color: var(--muted);
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.card .icon { font-size: 2rem; }
.card h3 { margin: 0.75rem 0 0.5rem; }
.card p { margin: 0; color: var(--muted); }

.page-header {
  background: var(--surface);
  padding: 4rem 0 3rem;
  text-align: center;
}

.page-header h1 { margin: 0 0 0.5rem; font-size: 2.5rem; }
.page-header p { margin: 0; color: var(--muted); }

.prose { max-width: 720px; margin: 0 auto; }

/* Contact form */
.form {
  max-width: 560px;
  margin: 0 auto;
  display: grid;
  gap: 1rem;
}

.form label { font-weight: 600; display: block; margin-bottom: 0.35rem; }

.form input,
.form textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}

.form input:focus,
.form textarea:focus {
  outline: 2px solid var(--brand);
  border-color: transparent;
}

.form-status { min-height: 1.5rem; color: var(--brand-dark); font-weight: 500; }

/* 404 */
.not-found {
  text-align: center;
  padding: 8rem 0;
}

.not-found .code {
  font-size: 6rem;
  font-weight: 800;
  color: var(--brand);
  margin: 0;
  line-height: 1;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

/* Mobile */
@media (max-width: 700px) {
  .nav-toggle { display: block; }

  .nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    display: none;
  }

  .nav.open { display: block; }

  .nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1.25rem 1rem;
  }

  .nav li a { display: block; padding: 0.6rem 0; }

  .hero { padding: 5rem 0; }
}