/*
 * NSC1501 Bioscience - COMPONENT STYLES
 * "Living Taxonomy" — Reusable UI components
 */

/* ============================================
   HEADER
   ============================================ */
.header {
  background: var(--forest);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(15, 34, 25, 0.2);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  max-width: var(--container-max);
  margin: 0 auto;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ivory);
  text-decoration: none;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  transition: color var(--duration-fast) var(--ease-out);
}

.logo:hover {
  color: var(--gold-light);
  background: transparent;
  text-decoration: none;
}

.logo:focus {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.logo-icon {
  width: 24px;
  height: 24px;
}

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

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--sage);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.nav-link:hover {
  color: var(--ivory);
  background: rgba(255, 255, 255, 0.08);
  text-decoration: none;
}

.nav-link.active {
  color: var(--gold-light);
  background: rgba(212, 168, 83, 0.12);
}

.nav-link:focus {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  background: transparent;
  border: var(--border-width) solid var(--sage);
  border-radius: var(--radius-sm);
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  justify-content: center;
  align-items: center;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.mobile-menu-toggle:hover {
  border-color: var(--gold);
}

.mobile-menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ivory);
  border-radius: 1px;
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-normal) var(--ease-out);
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--forest);
    border-top: var(--border-width) solid rgba(255, 255, 255, 0.1);
    padding: var(--space-sm) 0;
    box-shadow: 0 8px 24px rgba(15, 34, 25, 0.3);
    gap: 0;
  }

  .nav.open {
    display: flex;
  }

  .nav-link {
    padding: var(--space-md) var(--space-lg);
    border-radius: 0;
    width: 100%;
  }

  .nav-link:hover {
    background: rgba(255, 255, 255, 0.06);
  }
}

/* ============================================
   HERO
   ============================================ */
.hero {
  background: var(--forest);
  color: var(--ivory);
  padding: var(--space-3xl) var(--space-lg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 10% 90%, rgba(212, 168, 83, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 90% 10%, rgba(196, 93, 62, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(90, 122, 94, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  line-height: 1.05;
  color: var(--ivory);
  margin-bottom: var(--space-lg);
  position: relative;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  color: var(--sage);
  max-width: 55ch;
  margin-bottom: var(--space-lg);
  position: relative;
  line-height: var(--line-height);
  border-left: var(--border-accent) solid var(--gold-muted);
  padding-left: var(--space-lg);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  position: relative;
}

.hero-meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gold-light);
  background: rgba(212, 168, 83, 0.1);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  border: var(--border-width) solid rgba(212, 168, 83, 0.2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-meta-item svg {
  width: 16px;
  height: 16px;
}

/* ============================================
   PROGRESS SECTION
   ============================================ */
.progress-overview {
  background: var(--bg-surface);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
}

.progress-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

@media (max-width: 768px) {
  .progress-stats {
    grid-template-columns: 1fr;
  }
}

.progress-stat {
  text-align: center;
  padding: var(--space-lg);
  background: var(--forest);
  color: var(--ivory);
  border-radius: var(--radius-md);
}

.progress-stat-value {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--gold-light);
  margin-bottom: var(--space-xs);
  line-height: 1;
}

.progress-stat-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--sage);
}

.progress-bar-large {
  height: 10px;
  background: var(--parchment);
  border-radius: 5px;
  overflow: hidden;
}

.progress-bar-large-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--forest-light), var(--moss));
  border-radius: 5px;
  transition: width var(--duration-slow) var(--ease-out);
}

/* ============================================
   CARD GRID
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.card {
  background: var(--bg-surface);
  text-decoration: none;
  color: var(--text-primary);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 0;
  position: relative;
  display: block;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-color-strong);
  background: var(--bg-surface);
}

.card:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
  border-radius: var(--radius-lg);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  background: var(--forest);
  color: var(--ivory);
}

.card-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gold-light);
}

.card-badge {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 600;
  color: var(--ivory);
  background: var(--terracotta);
  padding: 3px var(--space-sm);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  margin: var(--space-lg) var(--space-lg) var(--space-sm);
  line-height: var(--line-height-tight);
  color: var(--text-primary);
}

.card:hover .card-title {
  color: var(--terracotta-dark);
}

.card-description {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0 var(--space-lg) var(--space-md);
  line-height: 1.6;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: 0 var(--space-lg) var(--space-lg);
}

.card-meta span {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--parchment);
  padding: 3px var(--space-sm);
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.card-progress {
  height: 4px;
  background: var(--parchment);
}

.card-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--forest-light), var(--moss));
  transition: width var(--duration-slow) var(--ease-out);
}

/* Card completion states */
.card.completed {
  position: relative;
}

.card.completed::after {
  content: '✓';
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 26px;
  height: 26px;
  background: var(--success);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  z-index: 2;
}

.card.in-progress {
  border-color: var(--ink-light);
}

.card.in-progress .card-header {
  background: var(--ink);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.75rem 1.5rem;
  border: var(--border-accent) solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  min-height: 44px;
  transition: all var(--duration-fast) var(--ease-out);
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.btn:active {
  transform: translateY(0);
}

.btn:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
}

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

.btn-primary:hover {
  background: var(--terracotta-dark);
  border-color: var(--terracotta-dark);
  color: white;
  box-shadow: 0 4px 12px rgba(196, 93, 62, 0.3);
}

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

.btn-secondary:hover {
  background: var(--parchment);
  border-color: var(--text-secondary);
}

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

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

/* ============================================
   TOGGLE BUTTONS
   ============================================ */
.explanation-toggle {
  display: flex;
  gap: 0;
  margin-bottom: var(--space-xl);
  border: var(--border-width) solid var(--border-color-strong);
  border-radius: var(--radius-md);
  width: fit-content;
  overflow: hidden;
  background: var(--parchment);
}

.toggle-btn {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border: none;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: transparent;
  color: var(--text-secondary);
  min-height: 44px;
  transition: all var(--duration-fast) var(--ease-out);
  border-right: var(--border-width) solid var(--border-color-strong);
}

.toggle-btn:last-child {
  border-right: none;
}

.toggle-btn.active {
  background: var(--forest);
  color: var(--ivory);
}

.toggle-btn:hover:not(.active) {
  background: var(--ivory-warm);
  color: var(--text-primary);
}

.toggle-btn:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: -2px;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--forest-deep);
  color: var(--ivory);
  padding: var(--space-3xl) var(--space-lg) var(--space-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-xl);
  max-width: var(--container-max);
  margin: 0 auto var(--space-xl);
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }
}

.footer-section h4 {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--gold-light);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-link {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--sage);
  text-decoration: none;
  padding: 2px 0;
  transition: color var(--duration-fast) var(--ease-out);
}

.footer-link:hover {
  color: var(--ivory);
  background: transparent;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-link:focus {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: var(--border-width) solid rgba(255, 255, 255, 0.1);
  max-width: var(--container-max);
  margin: 0 auto;
}

.footer-copyright {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* Site footer (week pages) */
.site-footer {
  background: var(--forest-deep);
  color: var(--ivory);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.footer-nav a {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--gold-light);
  text-transform: uppercase;
  text-decoration: none;
  letter-spacing: 0.05em;
  padding: var(--space-sm);
  transition: color var(--duration-fast) var(--ease-out);
}

.footer-nav a:hover {
  color: var(--ivory);
  background: transparent;
  text-decoration: underline;
}

.site-footer p {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  margin: 0;
  letter-spacing: 0.05em;
}

/* ============================================
   BREADCRUMBS
   ============================================ */
.breadcrumb {
  background: var(--bg-secondary);
  border-bottom: var(--border-width) solid var(--border-color);
  padding: var(--space-sm) var(--space-lg);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--container-max);
  margin: 0 auto;
  flex-wrap: wrap;
}

.breadcrumb-item {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.03em;
}

.breadcrumb-item a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.breadcrumb-item a:hover {
  background: var(--parchment);
  color: var(--text-primary);
  text-decoration: none;
}

.breadcrumb-item a:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.breadcrumb-separator {
  color: var(--border-color);
  font-weight: 400;
}

.breadcrumb-item[aria-current="page"] {
  font-weight: 600;
  color: var(--text-primary);
}