/* UI Components (Buttons, Cards, Badges, Forms) */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--brand-gradient);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--brand-gradient-hover);
  color: #ffffff;
  box-shadow: 0 0 25px rgba(37, 99, 235, 0.45);
  transform: translateY(-2px) scale(1.02);
}

.btn-glow {
  position: relative;
  box-shadow: 0 0 20px rgba(37, 99, 235, 0.35);
  animation: pulseGlow 3s infinite ease-in-out;
}

.btn-glow:hover {
  box-shadow: 0 0 30px rgba(16, 185, 129, 0.55);
  transform: translateY(-3px) scale(1.03);
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 18px rgba(37, 99, 235, 0.3); }
  50% { box-shadow: 0 0 28px rgba(16, 185, 129, 0.45); }
}

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

.btn-secondary:hover {
  background-color: var(--bg-muted);
  border-color: var(--border-color-hover);
  color: var(--primary-400);
}

.btn-outline {
  background: transparent;
  color: var(--primary-400);
  border-color: var(--border-brand);
}

.btn-outline:hover {
  background-color: var(--bg-accent-subtle);
  color: var(--primary-500);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 0.375rem 0.875rem;
  font-size: 0.85rem;
}

/* Feature & Tool Cards */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  transition: all var(--transition-normal);
  position: relative;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--border-brand);
  transform: translateY(-5px);
  box-shadow: var(--card-hover-shadow);
}

.gradient-border-card {
  position: relative;
  background: linear-gradient(var(--bg-surface), var(--bg-surface)) padding-box,
              linear-gradient(135deg, rgba(37, 99, 235, 0.3), rgba(16, 185, 129, 0.3)) border-box;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.gradient-border-card:hover {
  background: linear-gradient(var(--bg-surface), var(--bg-surface)) padding-box,
              linear-gradient(135deg, rgba(37, 99, 235, 0.7), rgba(16, 185, 129, 0.7)) border-box;
  transform: translateY(-5px);
  box-shadow: var(--card-hover-shadow);
}

.card-icon-circle {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12) 0%, rgba(16, 185, 129, 0.12) 100%);
  color: var(--primary-400);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(56, 189, 248, 0.25);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
  transition: transform var(--transition-fast);
}

.card:hover .card-icon-circle {
  transform: scale(1.08);
}

.card-icon {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: var(--radius-md);
  background: var(--bg-accent-subtle);
  color: var(--primary-400);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.card-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.card-desc {
  font-size: 0.925rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex: 1;
}

/* Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.95rem;
  border-radius: var(--radius-full);
  font-size: 0.775rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
  color: var(--primary-400);
  border: 1px solid rgba(56, 189, 248, 0.3);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

/* Informational Banners / Notices */
.info-notice {
  background-color: var(--bg-accent-subtle);
  border: 1px solid var(--border-brand);
  border-radius: var(--radius-md);
  padding: 0.875rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-main);
}

.info-notice svg {
  color: var(--primary-400);
  flex-shrink: 0;
}

/* Tool Cards & Favorite Toggle */
.tool-card {
  position: relative;
  overflow: hidden;
  border-top: 4px solid var(--card-accent-color, var(--border-brand));
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-fast);
}

.tool-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 24px -4px rgba(0, 0, 0, 0.12), 0 6px 12px -2px rgba(0, 0, 0, 0.08);
}

/* Category Accent Corner Stripe */
.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 32px;
  height: 32px;
  background: var(--card-accent-color, var(--primary-400));
  clip-path: polygon(0 0, 100% 0, 0 100%);
  opacity: 0.85;
  pointer-events: none;
  z-index: 1;
}

/* Category Themes on Cards */
.tool-card[data-category-theme="Academic"] {
  --card-accent-color: var(--cat-academic-color);
  --card-bg-subtle: var(--cat-academic-bg);
  --card-border-subtle: var(--cat-academic-border);
}
.tool-card[data-category-theme="Math"] {
  --card-accent-color: var(--cat-math-color);
  --card-bg-subtle: var(--cat-math-bg);
  --card-border-subtle: var(--cat-math-border);
}
.tool-card[data-category-theme="Time & Date"] {
  --card-accent-color: var(--cat-time-color);
  --card-bg-subtle: var(--cat-time-bg);
  --card-border-subtle: var(--cat-time-border);
}
.tool-card[data-category-theme="Productivity"] {
  --card-accent-color: var(--cat-prod-color);
  --card-bg-subtle: var(--cat-prod-bg);
  --card-border-subtle: var(--cat-prod-border);
}
.tool-card[data-category-theme="Text"] {
  --card-accent-color: var(--cat-text-color);
  --card-bg-subtle: var(--cat-text-bg);
  --card-border-subtle: var(--cat-text-border);
}
.tool-card[data-category-theme="Image & File"] {
  --card-accent-color: var(--cat-image-color);
  --card-bg-subtle: var(--cat-image-bg);
  --card-border-subtle: var(--cat-image-border);
}
.tool-card[data-category-theme="Other"] {
  --card-accent-color: var(--cat-other-color);
  --card-bg-subtle: var(--cat-other-bg);
  --card-border-subtle: var(--cat-other-border);
}

[data-theme="dark"] .tool-card[data-category-theme="Academic"] { --card-bg-subtle: var(--cat-academic-dark-bg); --card-border-subtle: var(--cat-academic-dark-border); }
[data-theme="dark"] .tool-card[data-category-theme="Math"] { --card-bg-subtle: var(--cat-math-dark-bg); --card-border-subtle: var(--cat-math-dark-border); }
[data-theme="dark"] .tool-card[data-category-theme="Time & Date"] { --card-bg-subtle: var(--cat-time-dark-bg); --card-border-subtle: var(--cat-time-dark-border); }
[data-theme="dark"] .tool-card[data-category-theme="Productivity"] { --card-bg-subtle: var(--cat-prod-dark-bg); --card-border-subtle: var(--cat-prod-dark-border); }
[data-theme="dark"] .tool-card[data-category-theme="Text"] { --card-bg-subtle: var(--cat-text-dark-bg); --card-border-subtle: var(--cat-text-dark-border); }
[data-theme="dark"] .tool-card[data-category-theme="Image & File"] { --card-bg-subtle: var(--cat-image-dark-bg); --card-border-subtle: var(--cat-image-dark-border); }
[data-theme="dark"] .tool-card[data-category-theme="Other"] { --card-bg-subtle: var(--cat-other-dark-bg); --card-border-subtle: var(--cat-other-dark-border); }

/* Card Icon Box Styling */
.tool-card .card-icon {
  width: 3.75rem;
  height: 3.75rem;
  border-radius: var(--radius-md);
  background: var(--card-bg-subtle, var(--bg-accent-subtle));
  color: var(--card-accent-color, var(--primary-400));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.85rem;
  margin-bottom: 1.25rem;
  border: 1px solid var(--card-border-subtle, rgba(56, 189, 248, 0.25));
  box-shadow: 0 2px 8px -1px rgba(0, 0, 0, 0.05);
  transition: transform var(--transition-fast);
}

.tool-card:hover .card-icon {
  transform: scale(1.08);
}

/* Matching Use Tool Button Styling */
.tool-card .tool-use-btn {
  border-color: var(--card-border-subtle, var(--border-brand));
  color: var(--card-accent-color, var(--primary-400));
  background-color: var(--card-bg-subtle, transparent);
  font-weight: 600;
}

.tool-card .tool-use-btn:hover {
  background-color: var(--card-accent-color, var(--primary-400));
  color: #ffffff;
  border-color: var(--card-accent-color, var(--primary-400));
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.fav-toggle-btn {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-subtle);
  cursor: pointer;
  padding: 0.45rem;
  border-radius: 50%;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  box-shadow: var(--shadow-sm);
}

.fav-toggle-btn:hover {
  color: #f59e0b;
  border-color: #f59e0b;
  background-color: #fef3c7;
  transform: scale(1.1);
}

[data-theme="dark"] .fav-toggle-btn:hover {
  background-color: rgba(245, 158, 11, 0.2);
}

.fav-toggle-btn.active {
  color: #f59e0b;
  fill: #f59e0b;
  border-color: #f59e0b;
  background-color: #fffbeb;
}

[data-theme="dark"] .fav-toggle-btn.active {
  background-color: rgba(245, 158, 11, 0.25);
}

.tool-card-categories {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.badge-sm {
  font-size: 0.725rem;
  padding: 0.2rem 0.6rem;
}

/* Category Badge Color Overrides */
.badge-academic { background-color: var(--cat-academic-bg); color: var(--cat-academic-color); border-color: var(--cat-academic-border); }
.badge-math { background-color: var(--cat-math-bg); color: var(--cat-math-color); border-color: var(--cat-math-border); }
.badge-time { background-color: var(--cat-time-bg); color: var(--cat-time-color); border-color: var(--cat-time-border); }
.badge-prod { background-color: var(--cat-prod-bg); color: var(--cat-prod-color); border-color: var(--cat-prod-border); }
.badge-text { background-color: var(--cat-text-bg); color: var(--cat-text-color); border-color: var(--cat-text-border); }
.badge-image { background-color: var(--cat-image-bg); color: var(--cat-image-color); border-color: var(--cat-image-border); }
.badge-other { background-color: var(--cat-other-bg); color: var(--cat-other-color); border-color: var(--cat-other-border); }

[data-theme="dark"] .badge-academic { background-color: var(--cat-academic-dark-bg); border-color: var(--cat-academic-dark-border); }
[data-theme="dark"] .badge-math { background-color: var(--cat-math-dark-bg); border-color: var(--cat-math-dark-border); }
[data-theme="dark"] .badge-time { background-color: var(--cat-time-dark-bg); border-color: var(--cat-time-dark-border); }
[data-theme="dark"] .badge-prod { background-color: var(--cat-prod-dark-bg); border-color: var(--cat-prod-dark-border); }
[data-theme="dark"] .badge-text { background-color: var(--cat-text-dark-bg); border-color: var(--cat-text-dark-border); }
[data-theme="dark"] .badge-image { background-color: var(--cat-image-dark-bg); border-color: var(--cat-image-dark-border); }
[data-theme="dark"] .badge-other { background-color: var(--cat-other-dark-bg); border-color: var(--cat-other-dark-border); }

/* Breadcrumbs */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--primary-400);
}

.breadcrumb-separator {
  opacity: 0.5;
}

.breadcrumb-current {
  color: var(--text-main);
  font-weight: 500;
}

/* Tool Form Controls */
.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-control, .form-select {
  width: 100%;
  padding: 0.65rem 0.875rem;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface-elevated);
  color: var(--text-main);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary-400);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.form-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

/* Tool Results Box */
.tool-result-card {
  background-color: var(--bg-accent-subtle);
  border: 1px solid var(--border-brand);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.result-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary-400);
  margin-bottom: 1rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}

.result-stat {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 1rem;
  border-radius: var(--radius-md);
  text-align: center;
}

.result-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary-400);
  line-height: 1.2;
}

.result-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Local File Dropzone */
.file-dropzone {
  border: 2px dashed var(--border-brand);
  border-radius: var(--radius-lg);
  padding: 2.5rem 1.5rem;
  text-align: center;
  background-color: var(--bg-surface);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.file-dropzone:hover {
  background-color: var(--bg-accent-subtle);
  border-color: var(--primary-400);
}

.file-dropzone input[type="file"] {
  display: none;
}

/* Keypad Grid for Calculators */
.calc-keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  margin-top: 1rem;
}

.calc-keypad-scientific {
  grid-template-columns: repeat(5, 1fr);
}

.calc-btn {
  padding: 0.875rem 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface-elevated);
  color: var(--text-main);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.calc-btn:hover {
  background-color: var(--bg-muted);
  border-color: var(--border-color-hover);
}

.calc-btn-op {
  background-color: var(--bg-accent-subtle);
  color: var(--primary-400);
  border-color: var(--border-brand);
}

.calc-btn-action {
  background: var(--brand-gradient);
  color: #ffffff;
  border: none;
}

.calc-btn-action:hover {
  box-shadow: var(--shadow-glow);
}

/* Scroll Fade-In Animations */
.fade-in-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}