/* 按钮样式 */
.btn {
    border-radius: var(--border-radius);
    font-weight: 400;
    padding: 8px 16px;
    transition: all var(--transition-speed);
    border: 1px solid transparent;
    font-size: 14px;
    line-height: 1.5;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.btn:hover {
    opacity: 0.9;
}

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

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* 按钮尺寸 */
.btn-sm {
    padding: 4px 8px;
    font-size: 12px;
    height: 28px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 16px;
    height: 44px;
}

/* 按钮颜色变体 */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    color: white;
}

.btn-secondary {
    background-color: var(--gray-500);
    border-color: var(--gray-500);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--gray-600);
    border-color: var(--gray-600);
    color: white;
}

.btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: var(--success-hover);
    border-color: var(--success-hover);
    color: white;
}

.btn-danger {
    background-color: var(--danger-color);
    border-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: var(--danger-hover);
    border-color: var(--danger-hover);
    color: white;
}

.btn-warning {
    background-color: var(--warning-color);
    border-color: var(--warning-color);
    color: white;
}

.btn-warning:hover {
    background-color: #d97706;
    border-color: #d97706;
    color: white;
}

.btn-info {
    background-color: var(--info-color);
    border-color: var(--info-color);
    color: white;
}

.btn-info:hover {
    background-color: #0891b2;
    border-color: #0891b2;
    color: white;
}

/* 轮廓按钮 */
.btn-outline-primary {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-outline-secondary {
    background-color: transparent;
    border: 1px solid var(--gray-500);
    color: var(--gray-500);
}

.btn-outline-secondary:hover {
    background-color: var(--gray-500);
    border-color: var(--gray-500);
    color: white;
}

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

.btn-outline-success:hover {
    background-color: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

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

.btn-outline-danger:hover {
    background-color: var(--danger-color);
    border-color: var(--danger-color);
    color: white;
}

/* 按钮组 */
.btn-group {
    position: relative;
    display: inline-flex;
    vertical-align: middle;
}

.btn-group .btn {
    position: relative;
    flex: 1 1 auto;
    margin-right: 0;
    border-radius: 0;
}

.btn-group .btn:first-child {
    border-top-left-radius: var(--border-radius);
    border-bottom-left-radius: var(--border-radius);
}

.btn-group .btn:last-child {
    border-top-right-radius: var(--border-radius);
    border-bottom-right-radius: var(--border-radius);
}

.btn-group .btn:not(:first-child) {
    border-left: none;
}

.btn-group .btn:hover {
    z-index: 1;
}

/* 浮动按钮 */
.btn-floating {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
    padding: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.btn-floating:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

/* 操作按钮组 */
.action-buttons {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.action-buttons .btn {
    min-width: auto;
    padding: 6px 12px;
}

/* 图标按钮 */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.btn-icon.btn-sm {
    width: 28px;
    height: 28px;
}

.btn-icon.btn-lg {
    width: 44px;
    height: 44px;
}

/* 关闭按钮 */
.btn-close {
    width: 1em;
    height: 1em;
    padding: 0.25em;
    background: transparent url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath d='m.235.739l15.026 15.026-1.061 1.061L-.826 1.8z'/%3e%3cpath d='M15.261.739L.235 15.765l-1.061-1.061L14.2-.326z'/%3e%3c/svg%3e") center/1em auto no-repeat;
    border: 0;
    border-radius: 0.25rem;
    opacity: 0.5;
    cursor: pointer;
}

.btn-close:hover {
    opacity: 0.75;
}

.btn-close:focus {
    outline: none;
    opacity: 1;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}