/* Typography utilities */
.text-accent { color: var(--accent-primary); }
.text-mono { font-family: var(--font-mono); font-size: 0.9em; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(53, 106, 230, 0.2);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  background-color: var(--bg-muted);
  transform: translateY(-2px);
}

/* Cards */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-subtle);
  text-align: left; 
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.08);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(250, 250, 248, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-sm) 0;
  transition: background-color 0.3s ease;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  position: relative;
  z-index: 100;
}

/* Mobile Nav Overlay */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(32, 39, 51, 0.4);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
  z-index: 80;
}
.nav-overlay.nav-open {
  opacity: 1;
  pointer-events: auto;
}

/* Navigation Links */
.nav-links {
  position: fixed;
  top: 0;
  right: -100%;
  height: 100vh;
  width: 75%;
  max-width: 350px;
  background-color: var(--bg-surface);
  box-shadow: -10px 0 30px rgba(0,0,0,0.05);
  display: flex;
  flex-direction: column;
  padding: var(--space-xl) var(--space-md);
  transition: right 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 90;
  gap: var(--space-md);
}

.nav-links.nav-open {
  right: 0;
}

.nav-links a {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease, transform 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-primary);
  transform: translateX(4px);
}

/* Hamburger Menu Toggle */
.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 100;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.menu-toggle.nav-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle.nav-open span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.nav-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 768px) {
  .menu-toggle { display: none; }
  .nav-overlay { display: none; }
  
  .nav-links {
    position: static;
    height: auto;
    width: auto;
    background: transparent;
    box-shadow: none;
    flex-direction: row;
    padding: 0;
  }
  
  .nav-links a {
    font-size: 0.95rem;
  }
  
  .nav-links a:hover,
  .nav-links a.active {
    transform: none;
  }
}

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-md) 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Accessibility */
*:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 4px;
}