:root {
  --primary: #0f766e;
  --primary-dark: #0b5952;
  --accent: #22c55e;
  --text: #1f2937;
  --muted: #6b7280;
  --bg: #ffffff;
  --bg-alt: #f4f7f6;
  --border: #e5e7eb;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary-dark);
}

.logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-weight: 500;
  color: var(--text);
}

.nav-links a:hover { color: var(--primary); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--primary-dark);
  cursor: pointer;
  padding: 4px 8px;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  padding: 90px 0;
}

.hero .container {
  display: grid;
  gap: 24px;
  max-width: 720px;
}

.hero h1 {
  font-size: 2.6rem;
  margin: 0;
  line-height: 1.2;
}

.hero p {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.9);
  margin: 0;
}

/* Sections */
section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }

.section-title {
  text-align: center;
  font-size: 2rem;
  margin: 0 0 12px;
  color: var(--primary-dark);
}

.section-subtitle {
  text-align: center;
  color: var(--muted);
  max-width: 620px;
  margin: 0 auto 48px;
}

/* Service cards */
.grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.card:hover {
  box-shadow: 0 12px 30px rgba(15, 118, 110, 0.12);
  transform: translateY(-2px);
}

.card h3 {
  margin-top: 0;
  color: var(--primary-dark);
}

.card p { color: var(--muted); margin-bottom: 0; }

/* Contact */
.contact-grid {
  display: grid;
  gap: 40px;
  grid-template-columns: 1fr 1fr;
  align-items: start;
}

@media (max-width: 760px) {
  .contact-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 8px 20px 16px;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
  }
  .nav-links.open { display: flex; }
  .nav-links li { padding: 10px 0; }
}

.info-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.info-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.info-list strong { color: var(--primary-dark); }

form {
  display: grid;
  gap: 14px;
}

input, textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
}

textarea { min-height: 130px; resize: vertical; }

.form-message {
  padding: 12px 14px;
  border-radius: 8px;
  font-weight: 500;
}

.form-message.success { background: #dcfce7; color: #166534; }
.form-message.error { background: #fee2e2; color: #991b1b; }
.hidden { display: none; }

/* Footer */
.site-footer {
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.85);
  padding: 40px 0;
  text-align: center;
  font-size: 0.95rem;
}

.site-footer a { color: #fff; font-weight: 600; }