:root {
  --color-text: #1d1d1d;
  --color-muted: #5a5a5a;
  --color-accent: #1d3557;
  --color-border: #e0e0e0;
}

body {
  color: var(--color-text);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

section {
  padding: 2.5rem 0;
}

h1,
h2,
h3 {
  color: var(--color-accent);
}

/* Header */

.site-header {
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  padding: 1rem 0;
}

.site-name {
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--color-border);
  background: none;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
}

.main-nav {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--color-accent);
}

.nav-link.active {
  font-weight: bold;
  color: var(--color-accent);
}

/* Intro */

.subheading {
  color: var(--color-muted);
  font-size: 1.1rem;
}

.profile-photo {
  width: 100%;
  max-width: 220px;
  border-radius: 8px;
  display: block;
  margin: 0 auto;
}

/* Cards */

.card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem;
  height: 100%;
}

.learning-card {
  min-height: 100px;
}

.learning-card .progress-bar {
  background-color: var(--color-accent);
}

.progress-text {
  margin-top: 0.5rem;
  color: var(--color-muted);
}

.tracker-controls {
  display: flex;
  gap: 1rem;
  margin-top: 0.75rem;
}

.meta {
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* Projects page */

.filter-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.filter-btn {
  border: 1px solid var(--color-accent);
  background: none;
  color: var(--color-accent);
  padding: 0.4rem 1rem;
  border-radius: 999px;
  cursor: pointer;
}

.filter-btn.active {
  background-color: var(--color-accent);
  color: #ffffff;
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  background-color: #f0f2f5;
  color: var(--color-text);
  font-size: 0.85rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
}

.hidden {
  display: none;
}

/* Contact */

.contact-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-link {
  display: inline-block;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
  padding: 0.5rem 1.25rem;
  border-radius: 6px;
}

.btn-link:hover,
.btn-link:focus {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* Now page */

.now-section {
  margin-bottom: 1.5rem;
}

.ai-note {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-top: 2rem;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* Mobile nav */

@media (max-width: 767px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 0.75rem;
    margin-top: 1rem;
  }

  .main-nav.open {
    display: flex;
  }
}