.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2); height: 52px; padding-inline: var(--space-5); border: 1px solid transparent; border-radius: var(--radius-md); font-size: var(--fs-small); font-weight: 600; cursor: pointer; transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast); min-width: 44px; }
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-secondary { background: var(--color-card-bg); color: var(--color-text-primary); border-color: var(--color-border); }
.btn-secondary:hover { background: var(--color-border); }
.btn-danger { background: var(--color-danger); color: #fff; }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--color-border); color: var(--color-text-secondary); cursor: not-allowed; pointer-events: none; }
.btn-icon { width: 44px; height: 44px; padding: 0; }

.card { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); padding: var(--space-5); transition: box-shadow var(--transition-base), transform var(--transition-base); }
.card-hover:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); text-decoration: none; }
.tool-card { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); padding: var(--space-6); }

.field { display: flex; flex-direction: column; gap: var(--space-2); }
.field label { font-size: var(--fs-small); font-weight: 600; }
.field .helper { font-size: var(--fs-caption); color: var(--color-text-secondary); }
.field .error-msg { font-size: var(--fs-caption); color: var(--color-danger); display: none; }
.field.has-error .error-msg { display: block; }
.input, .select { height: 52px; padding-inline: var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-bg); color: var(--color-text-primary); transition: border-color var(--transition-fast), box-shadow var(--transition-fast); width: 100%; }
.input:focus, .select:focus { outline: none; border-color: var(--color-primary); box-shadow: var(--focus-ring); }
.field.has-error .input, .field.has-error .select { border-color: var(--color-danger); }

.toggle { position: relative; display: inline-flex; align-items: center; cursor: pointer; }
.toggle input { position: absolute; opacity: 0; }
.toggle .track { width: 44px; height: 26px; border-radius: var(--radius-full); background: var(--color-border); transition: background var(--transition-fast); }
.toggle .thumb { position: absolute; left: 3px; top: 3px; width: 20px; height: 20px; border-radius: 50%; background: #fff; box-shadow: var(--shadow-sm); transition: transform var(--transition-fast); }
.toggle input:checked + .track { background: var(--color-primary); }
.toggle input:checked + .track + .thumb { transform: translateX(18px); }
.toggle input:focus-visible + .track { box-shadow: var(--focus-ring); }

.search-box { position: relative; max-width: 480px; }
.search-box .input { padding-left: 44px; }
.search-box .search-icon { position: absolute; left: var(--space-4); top: 50%; transform: translateY(-50%); color: var(--color-text-secondary); pointer-events: none; }

.chip { display: inline-flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-3); background: var(--color-card-bg); border: 1px solid var(--color-border); border-radius: var(--radius-full); font-size: var(--fs-caption); color: var(--color-text-secondary); }
.chip .check { color: var(--color-success); }

.accordion-item { border-bottom: 1px solid var(--color-border); }
.accordion-trigger { width: 100%; display: flex; justify-content: space-between; align-items: center; gap: var(--space-4); padding: var(--space-4) 0; background: none; border: none; cursor: pointer; text-align: left; font-size: var(--fs-body); font-weight: 600; color: inherit; }
.accordion-trigger .icon { transition: transform var(--transition-fast); flex-shrink: 0; }
.accordion-trigger[aria-expanded="true"] .icon { transform: rotate(180deg); }
.accordion-panel { overflow: hidden; max-height: 0; transition: max-height var(--transition-base); color: var(--color-text-secondary); }
.accordion-panel[data-open="true"] { max-height: 600px; padding-bottom: var(--space-4); }

.toast-region { position: fixed; bottom: var(--space-5); right: var(--space-5); z-index: 1100; display: flex; flex-direction: column; gap: var(--space-3); }
.toast { background: var(--color-text-primary); color: var(--color-bg); padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); box-shadow: var(--shadow-lg); opacity: 0; transform: translateY(8px); transition: opacity var(--transition-base), transform var(--transition-base); }
.toast.show { opacity: 1; transform: translateY(0); }

.empty-state { text-align: center; color: var(--color-text-secondary); padding: var(--space-8) var(--space-4); }
.empty-state svg { margin: 0 auto var(--space-4); color: var(--color-border); }
.skeleton { background: linear-gradient(90deg, var(--color-card-bg) 25%, var(--color-border) 37%, var(--color-card-bg) 63%); background-size: 400% 100%; animation: skeleton-loading 1.4s ease infinite; border-radius: var(--radius-sm); }
@keyframes skeleton-loading { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }
.fade-in { animation: fadeIn var(--transition-base) both; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }