:root {
  --bg-light: #f3f4f6;
  --bg-dark: #111827;
  --text-light: #1f2937;
  --text-dark: #f3f4f6;
  --accent-light: #2563eb;
  --accent-dark: #60a5fa;
  --card-bg-light: #ffffff;
  --card-bg-dark: #1f2937;
  --text-secondary-light: #4b5563;
  --text-secondary-dark: #d1d5db;
  --muted-light: #6b7280;
  --muted-dark: #9ca3af;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background-color: var(--bg-light);
  color: var(--text-light);
  transition: background-color 0.3s, color 0.3s;
  overflow-x: hidden;
}

.dark body {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

img, video, iframe {
  max-width: 100%;
  height: auto;
}

/* Utility wrapper for max content width */
.container {
  max-width: 1024px;
  padding: 0 1rem;
  margin: 0 auto;
}

/* Hero Section */
.hero {
  background-color: var(--card-bg-light);
  padding: 4rem 1rem;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  border-bottom-left-radius: 1rem;
  border-bottom-right-radius: 1rem;
}
.dark .hero {
  background-color: var(--card-bg-dark);
}
.hero h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}
.hero p {
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
}
.primary-btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--accent-light);
  color: white;
  font-weight: bold;
  border-radius: 0.5rem;
  text-decoration: none;
  transition: background 0.3s;
  text-align: center;
}
.primary-btn:hover {
  background-color: #1d4ed8;
}

/* Generic Section */
.section {
  padding: 4rem 1rem;
}
.section h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid #e5e7eb;
  padding-bottom: 0.5rem;
}

/* Responsive Text */
p {
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: 1rem;
  word-break: break-word;
}

.note p {
  font-size: 1.125rem;
  text-align: center;
  color: var(--text-secondary-light);
}
.dark .note p {
  color: var(--text-secondary-dark);
}
.highlight {
  font-weight: 600;
  color: var(--accent-light);
}
.dark .highlight {
  color: var(--accent-dark);
}

/* Projects Section */
.projects {
  background-color: #e5e7eb;
}
.dark .projects {
  background-color: var(--bg-dark);
}
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 640px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 960px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.project-card {
  background-color: var(--card-bg-light);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: box-shadow 0.3s ease;
}
.dark .project-card {
  background-color: var(--card-bg-dark);
  color: var(--text-secondary-dark);
}
.project-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}
.project-card h3 {
  font-size: 1.25rem;
  color: var(--accent-light);
  margin-bottom: 0.75rem;
}
.dark .project-card h3 {
  color: var(--accent-dark);
}
.project-card p {
  color: var(--text-secondary-light);
}
.dark .project-card p {
  color: var(--text-secondary-dark);
}

/* Contact */
.contact a {
  color: var(--accent-light);
  text-decoration: underline;
}
.whatsapp-btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.75rem 1.5rem;
  background-color: #16a34a;
  color: white;
  border-radius: 0.5rem;
  text-decoration: none;
}
.whatsapp-btn:hover {
  background-color: #15803d;
}
.external-link {
  margin-top: 2rem;
  color: var(--muted-light);
}
.dark .external-link {
  color: var(--muted-dark);
}

/* Footer */
.footer {
  background-color: var(--bg-dark);
  color: white;
  text-align: center;
  padding: 2rem 1rem;
}
.dark .footer {
  background-color: black;
}