/* BankFlow - 버튼 컴포넌트 (v2 — Modern SaaS) */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--bf-space-2);
    padding: 9px var(--bf-space-4);
    font-size: var(--bf-text-sm);
    font-weight: 600;
    line-height: 1.4;
    border-radius: var(--bf-radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--bf-transition);
    white-space: nowrap;
    text-decoration: none;
    font-family: inherit;
    letter-spacing: -0.01em;
    position: relative;
    overflow: hidden;
}

.btn:active:not(:disabled) {
    transform: scale(0.97);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

.btn svg {
    flex-shrink: 0;
}

/* 크기 */
.btn-sm {
    padding: 5px var(--bf-space-3);
    font-size: var(--bf-text-xs);
    border-radius: var(--bf-radius-sm);
}

.btn-lg {
    padding: 12px var(--bf-space-8);
    font-size: var(--bf-text-base);
    border-radius: var(--bf-radius-lg);
}

/* Primary — 주요 액션 */
.btn-primary {
    background: var(--bf-primary);
    color: #ffffff;
    box-shadow: var(--bf-shadow-xs), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}
.btn-primary:hover:not(:disabled) {
    background: var(--bf-primary-hover);
    box-shadow: var(--bf-shadow-primary);
}

/* Secondary */
.btn-secondary {
    background: var(--bf-bg-hover);
    color: var(--bf-text);
    border-color: var(--bf-border);
}
.btn-secondary:hover:not(:disabled) {
    background: var(--bf-bg-active);
    border-color: var(--bf-border-input);
}

/* Success */
.btn-success {
    background: var(--bf-success);
    color: #ffffff;
    box-shadow: var(--bf-shadow-xs);
}
.btn-success:hover:not(:disabled) {
    filter: brightness(1.1);
}

/* Danger */
.btn-danger {
    background: var(--bf-danger);
    color: #ffffff;
    box-shadow: var(--bf-shadow-xs);
}
.btn-danger:hover:not(:disabled) {
    filter: brightness(1.1);
}

/* Ghost — 최소 존재감 */
.btn-ghost {
    background: transparent;
    color: var(--bf-text-secondary);
}
.btn-ghost:hover:not(:disabled) {
    background: var(--bf-bg-hover);
    color: var(--bf-text);
}

/* Outline */
.btn-outline {
    background: transparent;
    color: var(--bf-primary);
    border-color: var(--bf-primary);
}
.btn-outline:hover:not(:disabled) {
    background: var(--bf-primary);
    color: #ffffff;
    box-shadow: var(--bf-shadow-primary);
}

/* 전체 너비 */
.btn-block {
    width: 100%;
}

/* 아이콘 버튼 */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--bf-radius);
}

/* 로딩 스피너 */
.btn-loading {
    color: transparent !important;
    pointer-events: none;
}
.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: btn-spin 0.5s linear infinite;
}
.btn-ghost.btn-loading::after,
.btn-outline.btn-loading::after {
    border-color: rgba(37, 99, 235, 0.2);
    border-top-color: var(--bf-primary);
}

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