/* ── Reusable Components ────────────────────────────────────── */

/* Card */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-card-hover);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.card-title i {
  font-size: 1rem;
  width: 20px;
  text-align: center;
}

/* Badge */
.badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  background: var(--accent-dim);
  color: var(--accent);
  letter-spacing: 0.02em;
}

.badge-health { background: var(--color-health-dim); color: var(--color-health); }
.badge-agri { background: var(--color-agriculture-dim); color: var(--color-agriculture); }
.badge-eng { background: var(--color-engineering-dim); color: var(--color-engineering); }
.badge-social { background: var(--color-social-dim); color: var(--color-social); }
.badge-cheat { background: var(--color-cheat-dim); color: var(--color-cheat); }

/* Chip / Tag */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(200, 164, 92, 0.1);
}

.chip-cheat {
  background: var(--color-cheat-dim);
  color: var(--color-cheat);
  border-color: rgba(244, 114, 182, 0.12);
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* Data Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.84rem;
}

.data-table th {
  text-align: left;
  padding: 10px 12px;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-medium);
}

.data-table td {
  padding: 9px 12px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover td {
  background: rgba(200, 164, 92, 0.03);
}

.data-table .val-pos { color: var(--color-positive); font-family: var(--font-mono); font-weight: 500; }
.data-table .val-neg { color: var(--color-negative); font-family: var(--font-mono); font-weight: 500; }
.data-table .val-boost { color: var(--color-boost); font-family: var(--font-mono); font-weight: 500; }
.data-table .val-accent { color: var(--accent); font-family: var(--font-mono); font-weight: 500; }

/* Table responsive wrapper */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: var(--space-sm) 0;
  border-radius: var(--radius-md);
}

/* Formula block */
.formula {
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin: var(--space-sm) 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  line-height: 1.9;
  overflow-x: auto;
}

.formula .cmt {
  color: var(--text-muted);
  font-style: italic;
}

/* Synergy callout */
.synergy-box {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(251, 191, 36, 0.04);
  border: 1px solid rgba(251, 191, 36, 0.12);
  margin: var(--space-md) 0;
}

.synergy-box .synergy-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-synergy);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.synergy-box p {
  font-size: 0.85rem;
}

.synergy-effect-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: rgba(251, 191, 36, 0.08);
  color: var(--color-synergy);
}

/* Prereq */
.prereq {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  background: rgba(251, 146, 60, 0.06);
  border: 1px solid rgba(251, 146, 60, 0.15);
  color: var(--color-warning);
}

/* CTA Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 36px;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:disabled,
.btn.is-loading {
  pointer-events: none;
  opacity: 0.7;
}

.btn .btn-spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn.is-loading .btn-label { opacity: 0; }
.btn.is-loading .btn-spinner { display: block; position: absolute; }

@keyframes spin {
  to { transform: rotate(360deg); }
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, #b8943f 100%);
  color: var(--text-inverse);
  box-shadow: 0 2px 16px rgba(200, 164, 92, 0.25);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 24px rgba(200, 164, 92, 0.35);
}

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

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

.btn-secondary:hover {
  background: var(--accent-dim);
}

/* Feature card (for About section) */
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  transition: all var(--transition-normal);
}

.feature-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.feature-card i {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: var(--space-md);
  display: block;
}

.feature-card h3 {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: 0.83rem;
  line-height: 1.6;
}

/* Stat counter */
.stat-item {
  text-align: center;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 2px;
}

/* FAQ Accordion */
.faq-item {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.faq-item:hover {
  border-color: var(--border-medium);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: 16px 20px;
  background: var(--bg-card);
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  border: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--bg-card-hover);
}

.faq-question i {
  color: var(--text-muted);
  font-size: 0.8rem;
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.is-open .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--ease-out);
}

.faq-item.is-open .faq-answer {
  max-height: 500px;
}

.faq-answer-inner {
  padding: 0 20px 18px;
}

.faq-answer-inner p {
  font-size: 0.87rem;
  line-height: 1.7;
}

/* Cheat card */
.cheat-card {
  background: rgba(244, 114, 182, 0.03);
  border-color: rgba(244, 114, 182, 0.12);
}

.cheat-card .card-title {
  color: var(--color-cheat);
}

/* Scroll indicator */
.scroll-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-surface-raised);
  border: 1px solid var(--border-medium);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 40;
  font-size: 0.9rem;
}

.scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  background: var(--accent-dim);
  transform: translateY(-2px);
}