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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f7f8fa;
  color: #111;
}

/* HEADER */
.page-header {
  max-width: 1100px;
  margin: 72px auto 56px;
  padding: 0 24px;
}

.page-header h1 {
  font-size: 2.4rem;
  margin-bottom: 12px;
}

.page-header p {
  color: #666;
  max-width: 520px;
}

/* PROJECTS */
.projects {
  max-width: 1100px;
  margin: 0 auto 120px;
  padding: 0 24px;
  display: grid;
  gap: 56px;
}

/* PROJECT CARD */
.project-card {
  background: #fff;
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 18px 40px rgba(0,0,0,0.06);
}

/* PREVIEW */
.project-preview {
  width: 100%;
  border-radius: 14px;
  overflow: hidden;
}

/* IFRAME */
.project-preview iframe {
  display: block;
  width: 100%;
  border: 0;

  height: var(--h-desktop, 520px);
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .page-header h1 {
    font-size: 2rem;
  }

  .projects {
    gap: 40px;
  }

  .project-card {
    padding: 16px;
  }

  .project-preview iframe {
    height: clamp(320px, 70vh, 560px);
  }
}