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

:root {
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --radius: 12px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

/* Nav */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Hero */
.hero {
  text-align: center;
  padding: 8rem 2rem 6rem;
  max-width: 700px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

/* Button */
.btn {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 0.75rem 2rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s, transform 0.15s;
}

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

/* About / Cards */
.about {
  padding: 5rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.about h2 {
  font-size: 2rem;
  margin-bottom: 3rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 2rem;
  transition: transform 0.2s;
}

.card:hover {
  transform: translateY(-4px);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.card h3 {
  margin-bottom: 0.5rem;
}

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

/* Contact */
.contact {
  padding: 5rem 2rem;
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact h2 {
  font-size: 2rem;
  margin-bottom: 2rem;
}

#contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

#contact-form input,
#contact-form textarea {
  background: var(--color-surface);
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  color: var(--color-text);
  font-size: 1rem;
  font-family: inherit;
  resize: vertical;
  transition: border-color 0.2s;
}

#contact-form input:focus,
#contact-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* Footer */
footer {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 2rem;
  }

  nav {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-links {
    gap: 1.25rem;
  }
}