* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-card: #1a1a1a;
  --text-primary: #f0f0f0;
  --text-secondary: #999999;
  --accent: #4af0c0;
  --accent-hover: #38d4a8;
  --border: #2a2a2a;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: Helvetica, Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 40px;
}

/* Nav */

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 400;
  transition: color 0.2s;
}

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

/* Hero */

.hero {
  padding: 200px 0 120px;
  text-align: center;
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.tagline {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 48px;
}

.btn {
  display: inline-block;
  padding: 14px 36px;
  background: var(--accent);
  color: var(--bg-primary);
  font-family: Helvetica, Arial, sans-serif;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s;
  letter-spacing: 0.3px;
}

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

/* About */

.about {
  padding: 100px 0;
  border-top: 1px solid var(--border);
}

.about h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 24px;
}

.about p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.8;
}

/* Services */

.services {
  padding: 100px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.services h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 48px;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 40px 32px;
}

.service-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Contact */

.contact {
  padding: 100px 0;
  border-top: 1px solid var(--border);
}

.contact h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
}

.contact-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 48px;
}

#contact-form {
  max-width: 560px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: Helvetica, Arial, sans-serif;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
}

.form-group textarea {
  resize: vertical;
}

.field-error {
  display: block;
  font-size: 13px;
  color: #ff6b6b;
  margin-top: 6px;
}

.form-success {
  padding: 16px 20px;
  background: rgba(74, 240, 192, 0.1);
  border: 1px solid var(--accent);
  border-radius: 4px;
  color: var(--accent);
  font-size: 14px;
  margin-bottom: 24px;
}

.form-success:empty,
.form-error:empty {
  display: none;
}

.form-error {
  padding: 16px 20px;
  background: rgba(255, 107, 107, 0.1);
  border: 1px solid #ff6b6b;
  border-radius: 4px;
  color: #ff6b6b;
  font-size: 14px;
  margin-bottom: 24px;
}

/* Footer */

footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

footer p {
  font-size: 13px;
  color: var(--text-secondary);
}

/* Responsive */

@media (max-width: 768px) {
  .container {
    padding: 0 24px;
  }

  .nav-inner {
    padding: 16px 24px;
  }

  .nav-links {
    gap: 20px;
  }

  .nav-links a {
    font-size: 13px;
  }

  .hero {
    padding: 160px 0 80px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .tagline {
    font-size: 17px;
  }

  .services-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .about,
  .services,
  .contact {
    padding: 80px 0;
  }
}