/* ===========================
   APLEXCUB STUDENT TOOLS
   components.css — UI Components
   =========================== */

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: all var(--transition-base);
  white-space: nowrap;
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-secondary);
  border-color: var(--color-secondary);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}
.btn-ghost:hover {
  border-color: var(--color-primary);
  background: rgba(37, 99, 235, 0.04);
  color: var(--color-primary);
}

.btn-sm {
  padding: 0.4rem 1rem;
  font-size: var(--text-xs);
}

/* --- Icon Button --- */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: all var(--transition-fast);
}
.btn-icon:hover {
  background: var(--color-surface-2);
  color: var(--color-primary);
}

/* --- Tool Card --- */
.tool-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-base);
  text-decoration: none;
  color: var(--color-text);
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(37,99,235,0.03), rgba(6,182,212,0.03));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.tool-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
  color: var(--color-text);
}
.tool-card:hover::before { opacity: 1; }

.tool-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(37,99,235,0.1), rgba(6,182,212,0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  flex-shrink: 0;
}

.tool-card-name {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.tool-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  flex: 1;
}

.tool-card-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-primary);
  margin-top: var(--space-3);
  width: fit-content;
}

/* --- Category Card --- */
.category-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition-base);
}

.category-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-text);
}

.category-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background: rgba(var(--icon-color, 37 99 235) / 0.08);
  color: var(--icon-color, var(--color-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}

.category-name {
  font-family: var(--font-primary);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.category-count {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* --- Grids --- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-5);
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .categories-grid { grid-template-columns: repeat(4, 1fr); }
}

/* --- Search Box --- */
.search-box-hero {
  position: relative;
  width: 100%;
  max-width: 540px;
  margin: var(--space-6) 0;
}

.search-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: var(--space-4);
  pointer-events: none;
  opacity: 0.5;
}

.search-input {
  width: 100%;
  padding: 0.875rem var(--space-4) 0.875rem 2.75rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  overflow: hidden;
  max-height: 360px;
  overflow-y: auto;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  text-decoration: none;
  color: var(--color-text);
  transition: background var(--transition-fast);
  border-bottom: 1px solid var(--color-border);
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover, .search-result-item.active {
  background: var(--color-surface);
  color: var(--color-primary);
}
.search-result-name {
  font-weight: 600;
  font-size: var(--text-sm);
}
.search-result-cat {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* --- FAQ --- */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-3);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}
.faq-item:hover { border-color: var(--color-primary); }

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-5) var(--space-6);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  gap: var(--space-4);
  cursor: pointer;
}

.faq-icon {
  flex-shrink: 0;
  transition: transform var(--transition-base);
  color: var(--color-primary);
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 0 var(--space-6) var(--space-5);
  color: var(--color-text-muted);
  font-size: var(--text-base);
  line-height: 1.7;
}
.faq-answer.open { display: block; }

/* --- PWA Banner --- */
.pwa-banner {
  position: fixed;
  bottom: var(--space-4);
  left: var(--space-4);
  right: var(--space-4);
  max-width: 420px;
  margin: 0 auto;
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  z-index: 999;
  animation: slideUp 0.4s ease;
}

@keyframes slideUp {
  from { transform: translateY(100px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

.pwa-banner-content {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.pwa-banner-title {
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: var(--text-sm);
}
.pwa-banner-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.pwa-banner-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}