/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--radius); border: 1px solid transparent;
  font-weight: 600; font-size: 14px; line-height: 1; text-decoration: none;
  transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn-primary:hover { background: var(--color-primary-2); border-color: var(--color-primary-2); color: #fff; }
.btn-accent { background: var(--color-accent); color: #fff; border-color: var(--color-accent); }
.btn-accent:hover { background: var(--color-accent-hover); border-color: var(--color-accent-hover); color: #fff; }
.btn-outline { background: transparent; color: var(--color-primary); border-color: var(--color-border-strong); }
.btn-outline:hover { background: var(--color-bg-sub); border-color: var(--color-primary); color: var(--color-primary); }
.btn-ghost { background: transparent; color: var(--color-text-muted); border-color: transparent; }
.btn-ghost:hover { background: var(--color-bg-sub); color: var(--color-text); }
.btn-danger { background: transparent; color: var(--color-danger); border-color: transparent; }
.btn-danger:hover { background: var(--color-danger-bg); }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: var(--radius-sm); }
.btn-lg { padding: 14px 26px; font-size: 16px; border-radius: var(--radius); }
.btn-block { width: 100%; }

/* Cards */
.card {
  background: var(--color-bg-elev);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}
.card-hover:hover { box-shadow: var(--shadow); border-color: var(--color-border-strong); transform: translateY(-1px); }
.card-flat { box-shadow: none; }

/* Pills / Badges */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: 999px; font-size: 12px; font-weight: 600;
  background: var(--color-bg-sub); color: var(--color-text-muted); border: 1px solid var(--color-border);
}
.pill-primary { background: #e0f2fe; color: #075985; border-color: #bae6fd; }
.pill-success { background: var(--color-success-bg); color: #166534; border-color: #bbf7d0; }
.pill-warn { background: var(--color-warn-bg); color: #92400e; border-color: #fde68a; }
.pill-danger { background: var(--color-danger-bg); color: #991b1b; border-color: #fecaca; }

/* Form */
.field { display: block; margin-bottom: var(--space-4); }
.field-label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--color-text); }
.field-help { font-size: 12px; color: var(--color-text-muted); margin-top: 4px; }
.input, .textarea, .select {
  width: 100%; padding: 9px 12px; border-radius: var(--radius);
  border: 1px solid var(--color-border-strong); background: #fff; color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input:focus, .textarea:focus, .select:focus {
  outline: none; border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18);
}
.textarea { min-height: 80px; resize: vertical; font-family: inherit; }
.search-input {
  position: relative; max-width: 360px;
}
.search-input .input { padding-left: 36px; }
.search-input::before {
  content: ''; position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  width: 14px; height: 14px; background: no-repeat center/contain
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23475569' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'><circle cx='11' cy='11' r='7'/><path d='m20 20-3.5-3.5'/></svg>");
  pointer-events: none;
}

/* Progress */
.progress {
  height: 8px; background: var(--color-bg-sub); border-radius: 999px; overflow: hidden;
  border: 1px solid var(--color-border);
}
.progress-bar {
  height: 100%; background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 999px; transition: width var(--transition);
}

/* Choice button (test) */
.choice {
  display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px;
  border: 1.5px solid var(--color-border); border-radius: var(--radius); background: #fff;
  cursor: pointer; transition: border-color var(--transition), background var(--transition);
  text-align: left; width: 100%; font: inherit; color: inherit;
}
.choice:hover { border-color: var(--color-primary); background: var(--color-bg-sub); }
.choice[data-selected="true"] { border-color: var(--color-accent); background: #eff6ff; }
.choice[data-correct="true"] { border-color: var(--color-success); background: var(--color-success-bg); }
.choice[data-incorrect="true"] { border-color: var(--color-danger); background: var(--color-danger-bg); }
.choice-letter {
  flex: 0 0 28px; height: 28px; border-radius: 50%; background: var(--color-bg-sub);
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 13px;
  color: var(--color-text-muted);
}
.choice[data-selected="true"] .choice-letter { background: var(--color-accent); color: #fff; }
.choice-body { flex: 1; min-width: 0; }

/* Accordion */
.accordion-item { border: 1px solid var(--color-border); border-radius: var(--radius); margin-bottom: 8px; background: #fff; }
.accordion-header {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 18px; cursor: pointer; user-select: none;
  font-weight: 600; font-size: 15px; color: var(--color-text);
}
.accordion-header:hover { background: var(--color-bg-sub); }
.accordion-header:focus-visible { background: var(--color-bg-sub); outline-offset: -2px; }
.accordion-chevron {
  width: 16px; height: 16px; transition: transform var(--transition); flex: 0 0 16px;
  background: no-repeat center/contain
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230f172a' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
}
.accordion-item[data-open="true"] .accordion-chevron { transform: rotate(180deg); }
.accordion-body { padding: 0 18px 14px 18px; border-top: 1px solid var(--color-border); display: none; }
.accordion-item[data-open="true"] .accordion-body { display: block; }

/* Tables */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--color-border); font-size: 14px; }
.table th { font-size: 12px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-text-muted); font-weight: 700; }
.table tbody tr:hover { background: var(--color-bg-sub); }

/* Modal */
.modal-backdrop {
  position: fixed; inset: 0; background: var(--color-overlay); display: flex;
  align-items: center; justify-content: center; z-index: 100; padding: var(--space-4);
}
.modal {
  background: #fff; border-radius: var(--radius-lg); max-width: 720px; width: 100%;
  max-height: 90vh; overflow: auto; box-shadow: var(--shadow-lg);
}
.modal-header { padding: var(--space-6); border-bottom: 1px solid var(--color-border); display: flex; justify-content: space-between; align-items: center; }
.modal-body { padding: var(--space-6); }
.modal-footer { padding: var(--space-4) var(--space-6); border-top: 1px solid var(--color-border); display: flex; gap: 8px; justify-content: flex-end; }

/* Empty state */
.empty {
  text-align: center; padding: var(--space-12) var(--space-6); color: var(--color-text-muted);
}
.empty h3 { color: var(--color-text); margin-bottom: 8px; }

/* Notices */
.notice {
  padding: var(--space-3) var(--space-4); border-radius: var(--radius); margin-bottom: var(--space-4);
  border: 1px solid; font-size: 13px;
}
.notice-info { background: #eff6ff; border-color: #bfdbfe; color: #1e40af; }
.notice-warn { background: var(--color-warn-bg); border-color: #fde68a; color: #92400e; }
.notice-success { background: var(--color-success-bg); border-color: #bbf7d0; color: #166534; }
.notice-danger { background: var(--color-danger-bg); border-color: #fecaca; color: #991b1b; }