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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-gray);
  background-color: var(--bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

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

a {
  color: var(--text-white);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-cyan);
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  font-size: inherit;
}

input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: var(--text-white);
  background: none;
  border: none;
  outline: none;
  width: 100%;
}

h1, h2, h3, h4 {
  font-weight: 600;
  color: var(--text-white);
  line-height: 1.2;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); margin-bottom: 1rem; }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); }

section {
  padding: 100px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-subtext {
  color: var(--text-gray);
  max-width: 600px;
  margin: 0 auto;
  white-space: nowrap;
}

@media (max-width: 768px) {
  .section-subtext {
    white-space: normal;
  }
}

.highlight-cyan {
  color: var(--accent-cyan);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 36px;
  font-weight: 500;
  font-size: 15px;
  border-radius: 4px;
  transition: all var(--transition-med);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.btn-cyan {
  background: transparent;
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan);
}

.btn-cyan:hover {
  background: var(--accent-cyan);
  color: var(--bg-primary);
}

.mobile-only {
  display: none;
}

@media (max-width: 768px) {
  section {
    padding: 60px 16px;
  }
  .section-header {
    margin-bottom: 40px;
  }
}