/* Components */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  font-size: var(--font-size-base);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-primary-light);
  color: white;
}

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

.btn.btn-white:hover:not(:disabled) {
  background-color: transparent;
  color: white;
}

.btn-group {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

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

.btn-outline:hover:not(:disabled) {
  border-color: var(--color-text);
}

/* Navigation Desktop */
.main-nav {
  display: none; /* Mobile first, shown in responsive.css */
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
  padding: var(--space-2) 0;
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-fast);
}

.nav-link:hover::after, .nav-link:focus-visible::after {
  width: 100%;
}

/* Mobile Menu Toggle */
.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 24px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 400; /* Above mobile menu */
}

.mobile-menu-btn span {
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  transition: all 0.3s linear;
  position: relative;
  transform-origin: 1px;
}

.mobile-menu-btn[aria-expanded="true"] span:first-child { transform: rotate(45deg) translate(5px, 5px); }
.mobile-menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.mobile-menu-btn[aria-expanded="true"] span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile Menu Panel */
.mobile-nav-panel {
  position: fixed;
  top: var(--header-height-mobile);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height-mobile));
  background-color: var(--color-bg);
  transform: translateX(100%);
  transition: transform 0.3s ease-in-out;
  z-index: var(--z-header);
  overflow-y: auto;
  padding: var(--space-6) var(--space-4);
  visibility: hidden;
}

.mobile-nav-panel.is-open {
  transform: translateX(0);
  visibility: visible;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.mobile-nav-link {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  display: block;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav-actions {
  margin-top: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Expertise Tags */
.expertise-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); margin-bottom: var(--space-6); }
.expertise-tag { 
    background-color: var(--color-primary); 
    color: white; 
    padding: var(--space-1) var(--space-3); 
    border-radius: var(--radius-full); 
    font-size: var(--font-size-sm); 
    font-weight: var(--font-weight-medium); 
}